About DLFT

DLFT IS A MANUFACTURER AND EXPORTER OF VARIOUS OEM CASTINGS, SUCH AS CAST IORN VALVE, MOTOR PARTS, PUMP PARTS, ELEVATOR PARTS, FIRE HYDRANTS, BENCH VISES, GATE HARDWARES ETC.

die casting how it works in china die casting suppliers foundry

Die casting may be classified as a permanent mold casting system in die casting and foundry; however, it differs from the process that the molten metal is forced into the mold or die under high (1000 to 30,000psi;6.89 to 206.8MPa) pressure during die casting process in die casting foundry.

during die casting process,the  die casting material solidifies rapidly( within a fraction of a second) because the die is water cooled. Upon solidification. the die is opened and ejector pins automatically knock the castings out of the die.

most of the castings will have die casting flash where the two die halves come together. This is usually removed in a trimming die, but may be done with the aid of abrasive belts or wheels or by tumbling now in china die casting suppliers foundryies.

if the parts are small. several of them may be made at one time in that is termed a multicavity die.

two main types of die casting machines are used: the hot chamber and the cold chamber types.

hot chamber die casting:

the hot chamber die casting machine is shown following picture. the material is kept in a heated holding pot. as the plunger descends. the required amount of alloy is automatically forced into the die. as the pistion retracts. the cylinder is again filled with the right amount of molten metal.an integrap feeding system makes the hot chamber die casting machine easy to automate. recent improvements in design make the machines particularly advantageous for magnesium parts in china die casting factories.

die-casting

die-casting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cold chamber die casting:

this process gets its name from the fact that the metal is ladled into the cold chamber for each shot. this procedure is necessary to keep the moltenmetal contact time with the steel cylinder to a minimum. this process is used for copper based metals and aluminum.

advantages and limitations of die casting process:

die casting machines can produce large quantities of parts with closed tolerance and smooth surfaces. the size is only limited by the capacity of the machine. most die castings are limited to about 75lb(34kg)zinc, 65lb(30kg)aluminum. and 44lb(20kg) of magnesim. die casting companies in china can make all range of such types of die castings.

die casting in china can provide thinner sections than any other casting process. wall thickness as thin as 0.015in (0.38mm) can be achieved with aluminum in small items.

however a more common range for large sizes will be 0.015 to 0.18in(2.67 to 4.5mm) that die casting foundry china can make.

some difficulty is experienced in getting sound castings in the larger capacities for die casting factory  have face to. Gases tend to be entrapped. which results in low strength and annoying leaks. one way to reduce metal sections without sacrificing strength is to design in ribs and bosses.

anothers approach to the porosity problem has been to operate the machine under a vacuum. this process is now being developed in china die casting suppliers factory.

the surface quality is dependent on that of the mold. parts made from new or repolished dies may have a surface roughness of 24uin, the hight surface finish available means that. in most cases, coating such as chrome plating. anodizing and painting may be applied directly.

more recently,decorative finishes of texture as obtained by photoetching have been applied. the technique as been used to simulate woodgrain finishes. as well as textile and leather finsihes, and to obtain checking and crosshatching take by die casting companies in china.

the initial cost of both the die casting machine and the dies limits this process to relatively high production quantities. the die costs are high because of the high accuracy with which they must be made and the high polish required to the surface.

perhaps the sharpest restriction on the die casting process comes from the limited range of materials that can be cast,that is, zinc-, aluminum- .magnesiom-, and copper-based allys, recently, some progress have been made with ferrous materials in china die casting suppliers foundry.

following pictures show DLFT one of china die casting suppliers exporting OEM aluminum die casting fire hose reel frame made according to importer drawing.

dei casting mould

dei casting mould

dei casting mould 2

dei casting mould 2

dei casting mould 3

dei casting mould 3

die casting reel frame

die casting reel frame

die casting reel frames

die casting reel frames

 

#entry-meta
#post-1345-->

the layout and main casting of automobile parts

The automobile industry is a fast developing industry. from the later 18th century when the first automobile was put on road. this industry has developed tremendously.

now there are thousands of factories all over the world manufacturing numerous types of automobiles. This industry employs millions of men and women directly in allied industies.

and automobile castings industry developing very fast along with the automobile industry fast developing,automotive casting manufacturers china and india have growed up along with they exporting OEM automobile casting parts such as  various automobile casting components, automobile die casting parts,car body casting,car engine casting parts,automobile engine cover castings,auto generator part castings,auto turbo part castings,automobile gearbox die castings,automobile charge air cooler tank castings,auto lighting components die casting and auto wheel hubs castings,automobile brake disc castings ,automobile water body casting, and  automoblie shock absorber inertia ring castings to USA,EUROPE AND JAPAN according to importers' drawings and request.

Now car engine casting process have also develop quickly in china automobile casting industry these years.

The automobile industry is a developing and demanding industry which does not find its end or saturation point. there is a great demand for trained and experienced persons in this industry for automobile castings, die casting automobile parts, system componets,auto Brake system castings foundryman job and machining works.

An automobile probably has about 700 different parts in it. some of them make by grey iron  sand castings, but most of them  made from alumimum die castings.

the layout of a car shows the posion of the main parts of an automobile. it consist of engine located at the front of the vehicle, followed by a clutch, gear box,propeller shaft, universal joint,differential, back axle etc.

the radiator is located in front of the engine, various others parts of the vehilce shown in the layout are dynamo, horn, steering box, fan, carburettor, air filter, steering wheel, cylinder, petrol tank, rear axle, front axle.

the drive from the gearbox is conveyed through a short shaft to the front universal joint of the propeller shaft. from the propeller shaft it is conveyed to the rear universal joint through a sliding splined type of joint.

the bevel gear of the short shaft is driven by the rear universaljoint. the bevel gear meshes with a large bevel gear which drive the two rear shaft through a differential gear.

for controlling the movement of the vehicles or to stop them, efficent braking system is a necessity for a vehicle. brakes attached to each of the four types. in the initial type, a pair of shoes carried on a stationary plate is expanded in contact with a wheel rotating drum mounted on the wheels to arrest the motion of the drum.

in the modern type of brakes, one or more pairs of pads are carried in a caliper attaced to the axle or wheel supporting linkage.

the side of the disk mounted on th wheel are griped by these pads, by applying pressure on a pedal, the brakes are applied. a hand lever acting through a separate linkage and locked in the one position is used.

#entry-meta
#post-1309-->

electric motor components diagram

For better understanding of a whole electric motor, no matter it's dc electric motor components or ac electric motor components,it is quite necessary to have some idea about the operation or purpose of electric motor components. no matter these motor components supplied by electric motor components manufacturersor electric motor components suppliers in china or from india.

each components or unit has its own special functions to perform and in conjuction with the other electric motor component constitutes a electric motor. those who want to operate, repair or assemble elctric motor must be able to recoginize different basic electric motor components by sight and know what their particular functions are.

With different number and arrangement of electric motor main components.electric motor vary in their outer appearance and size as well as in the details of construction. However, they all have the same main electric motor component parts which, though the components parts may look different. will perform the same functions.

By parts each electric motor can be separated into fixed parts and moving parts.

Roughly speaking, fixed parts component of electric motor refer to the motor frame which rests on a hull structure termed as electric motor foundation or motor seat,motor frame, motor end cover.etc.

While moving parts component in electric motor include motor rotor, motor shaft,bearing,motor fan. etc.

the following is a electric motor components diagram brief introduction on the basic electric motor components:

1.motor frame

cast iron motor frame, material standard subjected to different forces such as inertia and impact of the moving parts apart from supporting the whole weight of electric motors.  by centrifugal casting electric motor such as cast iron motor casing,cast iron motor body,electric motor body casting material according to ASTM, DIN,BS standard.

2.motor end cover

electric motor have two cast iron end covers,and is mounted up on the motor fame two side,as support of motor shaft,electric motor body part casting material usually is grey iron casting.

electric motor components diagram

electric motor components diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3. motor shaft

the motor shaft turns under the action of rotor. the shaft supported by two side bearing which mounted on the two end cover. the shaft output turning throught the shaft outside of motor frame.so that to turn others  equipment like pump or others turning.

#entry-meta
#post-1249-->

how many valve types manufacted by valve suppliers china

many valve types manufacted by valve suppliers china, valve components suppliers and valve accessories suppliers in china.

1. valve definition by valve techologies organizaton:

 Valves control or interrupt flow. Basically, they have bodies furnished with flanged or screwed ends (or ends prepared for welding) for connection to the joining pipes and internal passages arranged so that they can be restricted or closed, this is done,  in valves,by lowering, raising or rotating a disc in relation to a seating surface or by controlling the movement of a ball.

2. valve types that china valve manufacturers can make.
the most commonly used valves fall into the following categories:globe valves, gate valves, butterfly valves, check and non-return valves and control valves. all these types valve can be manufactured by valve suppliers china.

3.The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipe. china valve components suppliers export lot of such kind of valve components castings abroad every year.

4.Unlike the globe valve,gate valves give full bore flow without change of direction. a gate can be moved in a direction at right angles to the flow by ascrewed spindle working in a nut.valve accessories suppliers in china made OEM such kind of valve parts according to importers' drawings.

5.A check valve is another name for a non-return valve, it allows flow in one direction only.

6. A relief valve can be used to ease excess pressure.lt consists of a disc held closed by a spring-loaded stem. the compression on the spring can be adjusted so that  the valve opens at the desired pressure.

Usually valve and fittings fitted in engine rooms,boiler rooms,pump rooms and shaft tunels are to be easily_accessible for operation.Where the valves and fittings are situated under the floor plate.not easily accessible for operation, they are to be provided with extended operating_rods or tools for operation.

Furthermore holes are to be cut in the floor plate under which the valves or fittings are located and to be provided with covers.

hope valve world 2016 can have a good year.

#entry-meta
#post-1245-->

what is centrifugal pumps

 centrifugal pumps unlike the reciprocating displacement pump. the simple centrifugal pump, which does not have a positive suction action,consists of a rotating impeller within a stationary pump casing.The fully shrouded.single entry impeller is the type most widely used.

The impeller is mounted on a shaft driven by a prime mover.it consist of a number of vanes backward from the direction of the rotation between the shrouding.

Water enters the rotating impeller through the entry,known as 'eye',at the centre. Due to the circular motion given it is thrown hy certrifugal force to the open periphery of the impeller where it leaves tangentially and enters the space in the casing.and then directed to the outlet branch.

Centrifugal pumps are non-positive and fairly low pressure units. Here a closed discharge valve.will not cause excessive pressure to build up.

centrifugal pumps can be divided into volute, diffuser, mixed-flow, axial flow and turbine or regenerative types.

centrifugal pumps find their widest application for dealing with large volumes with medium-to-low heads and Viscositis.Centrifugal or radial flow pumps give regular delivery,and are quiet in operation.

Axial-flow and semi-axial-flow rotary pumps are frequenLly used for large volumes and low heads,as they are simple.occupy little space and are low in capital cost.

Vertical pumps are in general use.because floor space is usually more valuable than height in engine rooms.

 Centrifugal units require to be primed if the liquid level is below the pump. Small integral reciprocating displacement priming pumps are sometimes provided,hut there is a wider use of water-ring pumps for priming purposes, because of their simplicity.

Various other means. such as internal recirculation,steam ejectors,etc. are also used in appropriate cases. 

In general. reciprocating pumps are suitable for delivering small quantities at high pressure, rotary pumps are used for moderate quantities at moderate pressure,and centrifugal pumps are more suitahle for large quantities at low pressure.

Centrifugal pumps,however,can he designed with a number of impellers in series to attain a high final delivery pressure. They are popular because they are very simple.

in construction,and can produce smooth,constant,non-pulsating discharge.

#entry-meta
#post-1241-->

what is marine positive displacement pump

A pumps  is a device which adds the energy to a liquid or gas,causing an increase in its pressure and perhaps a movement of the fluid.

A basic pumping system consists of a suction branch, a pump and a discharge branch. the pumps employed on board ship fall into two broad classes:positive displacement pumps and centrifugal pumps.

positive displacement pumps  are those where the volume of the pump chamber is alternately increased to draw the liquid in from the suction pipe and then decreased to force the liquid out into the delivery pipe.

the liquid or gas is displaced from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.

This kind of pumps can be subdivided into two main clawes: reciprocating pumps.in which a plunger or piston is mechanically reciprocated in a liquid cylinder.

And rotary pumps,where the liquid is fored through the pump cylinder or casing by means of screws or gears.under reciprocating are the direct acting,power, and crank-fly- wheel types.

while under rotary are the gear, Vane,screw and piston types. Reciprocating and rotary positive displacememt pumps are self-priming,and can deal with liquid from a level below the pump.

The typical pumps employed in steering gear hydraulic system are rotary-piston pumps,classified either axial or radial type. The pistons in an axial pump operate along the axis of the pump drive shaft.

The cylinder block has a series of cylinder bores with pistons that move in and out.As the block rotates. each piston moves in and out of its cylinder, the length of stroke depending on the angle of the cylinder block with reference to the drive plate or swash plate according to the designs.

As each piston moves outward.oil is drawn into the cylinder bore through the valve plate.On the return stoke,the oil is forced out through the valve plate under pressure.

gear pump is a represent of the rotary pump family and is commonly used on hoard a ship.it consists of two or more meshing gears(spur,single or double helical teeth) enclosed in a close-fitted housing. these are used extensivelv for pumping fuel oil. lubricating oil and hydraulic oil.

When gears are unmeshed on the inlet side. a pressure drop occurs that helps the atmospheric pressure acting on the surface of the oil in the reservoir to force it up the pipe to fill the void,the oil is then transferred around the periphery of the pump housing.

As the gear teeth mesh again on the outlet side,they form a seal that prevents oil from backing up to the inlet, the oil in the void is then be forced out into the discharge line.

#entry-meta
#post-1237-->

iron casting foundry finishing operations in china

iron casting foundry finishing operations in china usually take following  steps:

After iron casting process, the castings have solidified and cooled somewhat, iron casting foundry take those castings and place on a shakeout table or grating on which the sand mold is broken up, leaving the iron casting free to be picked out.

The iron casting is then taken to the finishing room where the gates and risers are removed.

Small gates and risers may be broken off with a hammer if the iron casting  material is brittle such as in grey iron casting process. Large iron casting require sawing, cutting with a torch, or shearing.

Unwanted metal protrusions such as fins, bosses, and small protions of gates and risers need to be smoothed off to blend with the surface.

Most of this work is done with a heavy-duty grinder and the process is known as snagginh or snag grinding.

On large iron casting it is easier to move the grinder than the work, so swing-type grinders are used.

Smaller iron casting are brought to stand or bench type grinders. hand and pneumatice chisels are used to trim castings or with others iron casting equipment used in china iron casting foundry

A more recent method of removing excess metal from ferrous castings is with a carbon air torch. This consists of a carbon rod and high amperage current with a stream of compressed air blowing at the base of it. 

This oxidizes and removes the metal as soon as it is molten. in many iron casting foundry in china, this method has replaced nearly all chipping and grinding operations. these step use by many  iron casting suppliers in china

This is the iron casting in china situation.  there are many iron casting manufacturers all around china mainland. every year produce lots of  iron casting products and export to all over the world by china iron casting suppliers . quality excellent, price competitive. but this have caused china heavy air polluted.

#entry-meta
#post-1231-->

Operator manual for bench vise with swivel base

It is important that your read the entire bench manual supplied by the bench vise manufacturers or bench vise suppliers to become familiar with the bench vise with swivel base.

Before uses of bench vise with swivel base Make sure the bench vise is securely mounted before using,and Please check for if have any damaged parts on the bench vise.

the bench vise with swivel base comes completely assembled.  Before proceeding the bench vise, wipe down the swivel bench vise with a degreasing solution or dish soap and water to remove any packaging grease on your bench vise.

Swivel bench vise mounting options:

Your swivel bench vise comes with mounting holes on the Base Foot.  Use the appropriate hardware to secure the swivel bench vise to your workbench. 

Before assembling your bench vise with swivel base, be sure that you have all parts described in the bench vise parts list supplied by bench vise manufacturers or suppliers in packing carton

Assemble attachments based on the intended use of the tool.

Mounting the swivel bench vise to a Wooden Workbench:

1.Measure the thickness of your workbench. To securely mount swivel bench vise to a wooden workbench, mount a wood washer underneath the mounting points for the bench vise in order to add strength.

2.Purchase three or four bench vise mounting bolts, nuts, and flat washers the appropriate length of your workbench and add one inch of length to the bolts to make up for the extra inch of the bench vise

3.Mark and drill the holes through the workbench, using the base as a template, for the mounting tabs on the base of the swivel bench vise.

4.Position the vise on the workbench and line up the holes drilled in step 3 with the holes in the mounting tabs.

5.Insert the Bolts into the mounting tabs and through the workbench.

Mounting the swivel bench vise to a metal Workbench:

1.Measure the thickness of your workbench. To securely mount your swivel bench vise to a metal workbench, mount an thick reinforcing plate underneath the mounting points when step 6 is performed.

2.Purchase three or four bench vise mounting bolts, nuts and flat washers that are the appropriate length for the thickness of the workbench. and add one inch of length to the bolts to make up for the extra inch of the bench vise.

3.Mark and drill the holes through the workbench, using the base as a template, for the mounting tabs on the base of the swivel bench vise.

4.Mark and drill the reinforcing plate, using the base of the bench vise as a template.

5. Position the vise on the workbench and line up the holes drilled in step 3 with the holes in the mounting tabs.

6.Insert bolts into the mounting tabs, and through the workbench (Remember to attach the reinforcing plate underneath the workbench, then thread on the nuts and tighten the bolts)

Clamping:

1.Open the bench vise with swivel base by turning the handle counterclockwise, until you have l/4" of space between your material and each jaw of the bench vise.

2.Hold the material between the jaws while you slowly tighten the bench vise by turning the handle clockwise. When your materials snug between the jaws, stop tightening.

3.Tighten the bench vise until you can no longer move the material you are working on.  do not over-tightening.

4.When finished working on the material, turn the handle counterclockwise. This will release the material from the bench vise.

Swivel base:

When the material is securely clamped in the bench vise, decide if you need to rotate the bench vise to allow better and safer access to material while working.  lf you need to change the position of the swivel bench vise, please follow the steps below.

1.Locate the Locking Clamps one to each side of the bench vise with swivel base.

2.Unlock each Locking Clamp lever by turning it counterclockwise.

3.Swivel the vise until you have better and safer access to your material

4.Lock each Locking Clamp lever by turning it clockwise until tight.

workbench with swivel bench vise

workbench with swivel bench vise

 

 

 

 

 

 

 

 

 

 

 

Related Reading

china bench vises manufacturers face tough competition around the worlds

Heavy Duty Bench Vises

American Type Bench Vises

Multi-Purpose Bench Vises

GS TUV VPA Approved Bench Vises

England Type Vises

Light Duty Bench Vises

Japan Type Bench Vises

Steel Bench Vises

Table Vises

Other Vises

the key to bench vise mounting

#entry-meta
#post-1230-->

fire fighting equipment play key role in a big fire

Firemen had been fighting the forest fire with many fire hydrants around and fire hoses,fire water pumps and fire fighting helicopter for nearly three weeks before they could get it under control.

A short time before. great trees had covered the countryside for miles decorated with red colored fire hydrants around the green grass and forest.

Now, smoke still rise up from the warm ground over the desilated hills. and those fire hydrants which had play key role in the big fire fighting still stand around there,but some of these fire hydrant broken because of big fire burned.  thanks for these fire hydrants, fire hose and fire fighting water pump which supplied enough water for pulling down the big fire.

winter was coming on and the hills threatened the surronding villages with destruction. for heavy rain would not only wash away the soil but would cause serious floods as well. in case have floods. the fire water pump and fire fighting equipment can also play key role to pump  the flood water outof the villages.

When the fire had at last been put out by firemen with fire hydrant, fire hose, fire water pump ,fire fight equipment helping. the forest authorities ordered 1000 set of a new fire hydrants and  fire hydrant parts from fire hydrant valve manufacturers in china.  thses new fire hydrant will be replaced those fire hydrant broken because of hte big fire, and  fire hydrant parts which would use to fire hydrant repair which was slightly broken in this fire.

And the forest authorities also ordered also some grass seed  which was sprayed over the ground in huge quantities by areoplanes, the planes had been planting seed for nearly a month, and use fire hydrants around there and fire pump to make rain to water the grass seed, by the spring time come on, however in many places the grass had already taken root. in place of the great trees which had been growing there for centuries. patches of green had begun to appear in the blackened soil.so you can see the fire fighting equipment play realy very important key role in a big fire

 

#entry-meta
#post-1216-->

pump casting process used in china pump casting foundry

pump casting foundry in china, there is much more to casting than selecting a process and making the appropriate pattern in pump casting process in china. During the past two decade since china entry into WTO.  China pump castings suppliers  manufacturers research and production experiences have provided scientific principles for better pump casting techniques.

For china pump casting foundry, the important considerations are the rate at which a pump casting mold cavity is filled, pump casting gate placement, pump casting riser design, the use of chill block of pump casting, and padding in pump casting process.

Filling the pump castings mold cavity. The velocity with which the molten metal fills the pump casting mold is determinded by the cross-sectional area of the gating system and mold-puring rate is the key factory for pump casting foundry foundrymanship.

Too slow a mold pouring rate means solidification before filling some parts of the mold. Allowing surface oxidation. Too high a pouring rate caused by too large gating system causes sand inclusion by erosion, particularly in green sand pump casting molding, and turbulence. These two all easy to cause pump casting defects

The minimum cross section in the gating system is called a choke. In the strict sense. The choke is the section in the gating system, when the gate system is choked at the bottom of the sprue.

It is called a nonpressurized system. This system is somewhat less reliable than a pressuried in which the choke is at the gate of pump casting molding system.

The first metal in the pouring basin and down the sprue usually has some turbulence that carries slag into the runner.To avoid slag in the pump castings, pump casting specialists suggested that the runner should extend past the last gate to trap the initial slag.

By the time the gates become operative. The liquid level should be high enough so that no slag can enter the pump casting cavity.

The runner should be laid out to minimize turbulence. That is it should be as straight and as smooth as possible. The gate is made to enter the cavity at the parting line of the pump casting mould.

pump casting specialists arrange gating may also be made at the top or bottom of the cavity. The parting lines gate is the easiest for the pump casting pattern maker to make;

However, the metal drops into the cavity, which may cause some erosion of the sand and some turbulence of the metal and finally cause for example like pump impeller casting defects

etc. For nonferrous metals, this drop aggravates the dross and entraps air in the metal of pump castings.

Top-gating is used for simple pump casting parts in gray iron, but not for nonferrous alloys pump casting materials, since excessive dross would be formed by the agitation.

Bottom gating provides a smooth flow of metal in the pump casting mold, however. If does have the disadvantage of an unfavorable temperature gradient. It cools as it rises, resulting in cold metal in the riser and hot metal at the gate.

Risers are designed by pump casting specialists and placed so as to ensure filling the cavity during solidification. They also act to relieve gas pressure in the pump casting mold and to reduce pressure on the lifting surface of the pump casting mold in china pump casting foundry

The volume of metal in the riser should be sufficient to retain heat long enough to feed the shrinkage cavity and to equalize the temperature in the pump body casting mold, avoiding casting strains.

The raiser requirements vary with the type of pump casting materials being poured. Gray cast iron pump casting parts, for example, needs less feeding than some alloys because a period of graphitization occurs during the final stages of solidification. Which cause an expansion that tends to counteract the metal shrinkage.

Many nonferrous metal pump casting part require elaborate feeding systems to obtain sound pump casting. The feed metal must be located above the highest point of the casting.

Chill Blocks are metal blocks placed in the pump body casting mold for localized heat dissipation. They may be placed at an intersection or joint where there is a comparatively large volume of metal to cool. thus relieving a hot spot or maintaining a more uniform cooling rate and better microstructure.

They may also be placed at the far surface of a pump body casting mold. Away from a riser or sprue. This will help the far end of the mold to freezed rapidly. Promoting directional solidification.

Chill blocks are also used by pump casting foundry at points where it is desirable to have localized hardening, as in the case of pump impeller casting process or pump bowl casting process.

Padding consists of adding to or building up a section to obtain adequate feeding of isolated section like some pump body casting and pump bowl casting, to feed central or outside boss of the pump body casting or pump bowl casting.

Can use risers with padding. Can provided a yield of say 45% of the metal poured. By the rule of thumb. The total thickness of pad and casting should not be less than one fifth of the metal feeding distance. This rule is not absolute but a good generalization in pump casting process.

pump casting process

pump casting process

#entry-meta
#post-1164-->

the key to bench vise mounting

Bench Vise mounting can be mounted in variety of positions and on many different styles of bench vise mounting options. The key to successful installation is careful planning and preparation. Installed properly, the bench vise will give a lifetime of daily service from the time you get the bench vises from bench vises suppliers. that is the best bench vise mounting ideas.

Bench vise mounting depending on the bench's top thickness, you have two mounting options. If your top is at least 2" thick, lag screws work fine. With washers attached.

Tun the lags up from underneath the bench vise's carriage, through the spacer block and into the underside of the bench top. If your top is less than 2" thick, install carriage bolts right through the bench top and secure them with nuts and washers under the bench vise's carriage. Be sure to countersink the heads of the bolts below the surface of the top to prevent tool or work damage.

Plug or fill the holes by any method that pleases you. With either mounting technique, you'll want to occasionally check the hardware to be sure it isn't working loose. As for maintenance bench vises or lubricate the threads of the main screw of bench vise with light oil and wax the guide rods occasionally.

Place the bench vise mounting bolts down through the vise base holes and through the bench. Screw on the nuts and tighten them with the proper sized wrench. Untighten and remove the C-clamp and you can start bench vise mounting.

1. remove the four bench vise mounting bolts and nuts from the four corners in the base of the vise. Position the vise onto the location you want it on the mounting bench.

If you're right handed, typical mounting positions would be either toward the left of the front edge of the bench, or the right end of bench. Carvers will probably find the end position most useful, as will those who clamp wide, flat work like doors and large panels. For general purpose work, the bench's front edge is probably the best option. Just be sure the bench vise doesn't interfere with the bench's legs or aprons.

Also, take into account that the bench vise will have wooden jaw liners,that stick out past the edge of the bench vise. Most people prefer have the ends of the jaw liners flush with a corner of the bench top, so take that into consideration when you locate bench vise.

2,clamp bench vise down to the bench by setting the top of the C-clamp onto the base of bench vise and the bottom of the C-clamp under the table or the bench you are attaching bench vise to. Tighten the clamp so that the bench vise will stay in the place you want it.

For most bench tops, you'll need to mount a spacer between bench vise carriage and the underside of the bench top. You'll want Bench vise's cast iron jaws set about 1/2" below the top surface of the bench to protect your tools from accidental contact. measure the distance between bench vise carriage and the underside of the bench. This distance is the thickness of your spacer. We recommend building the spacer from all of which are relatively crush-resistant.

3.Find the drill bit that is the same size as the bolts that were in the base of bench vise. Tighten the proper sized drill bit into the drill. Drill out all four holes through the bench vise base holes and through the bench you are amounting the bench vise onto.

4.Once you've determined the thickness of the spacer block, you'll need to mortise the rear jaw into the edge of your bench top. Put the bench top on edge and secure it well. Temporarily clamp the vise with the spacer blocks to the bench top. The depth of the mortise will be the thickness of the rear jaw. On some vise models, you may also have to remove additional material to accommodate any reinforcement webbing cast into the bench vise's carriage.

5.Wooden liners expand your vise's holding capacity and prevent your work from being marred by the cast iron jaws. Any hardwood will work as a liner material. The front jaw liner should be at least 1 5/8" thick to prevent deflection and so you can drill holes in the top of the liner for bench dogs if you like.

6.The rear jaw only needs to be 3/4 – 1" thick because it will be supported by the edge of the bench. For small vises like the Anant 52 and the Groz 7", make the liner length 12 – 14". Anything longer will cause excessive racking and shorten the life of your vice.

7.In the end of bench vise mounting,the jaw liners need to be at least 1/8" above the bench vise's guide posts to allow for seasonal movement and flush with the top of the bench. However you choose to attach your jaw liners to the bench vise, make bench vises can be easily removed if they become damaged or warped. At this point, close the bench vise and make sure the liners mate up acceptably and shim if necessary. Remember, the jaws of bench vises toe in where they meet at the top and should do so after the liners are installed.

bench vise mounting picture

bench vise mounting picture

 

 

 

 

 

 

 

 

 

 

 

Related Readings

china bench vises manufacturers face tough competition around the worlds

American Type Bench Vises

Heavy Duty Bench Vises

Light Duty Bench Vises

Multi-Purpose Bench Vises

GS TUV VPA Approved Bench Vises

England Type Vises

Japan Type Bench Vises

Steel Bench Vises

Table Vises

Other Vises

 

 

#entry-meta
#post-1156-->

automotive casting china industry is more advanced than automotive casting manufacturers india

Automotive casting technology in china's automotive casting industry is developed very quickly,by now,automotive casting china can produce automotive engine blocksauto wheel hub castings,Auto shock absorber inertia ring castings,auto heads casting, cast iron automotive wheels,Auto Brake Disc Castings,and other auto casting parts etc.

now in china, automotive metal casting all most all taken in gray iron foundries and ductile iron foundries. 
  
china automobile foundries use cupola or induction furnaces to melt the iron in automotive casting process so that to melt the iron use to pour the automtive casting parts with sand molding caves. the things is as same as automotive casting manufacturers india.
  
China automotive casting suppliers make automotive sand casting In ferrous foundries, moulds are traditionally made from green sand, and the Cores can be made from thermosetting phenol-formaldehyde resins or similar resins mixed with sand which is then heated -hot boxmethod or from amine-cured urethane sand mixtures which cure at room temperature -cold boxmethod. The resin sand mixture is poured into a core box which has a cavity in the desired shape of the core. 
  
automotive casting and machining:The auto part castings produced in gray iron castings, such as cast iron automotive engine blocks,cast iron auto heads,cast iron automotive wheels, and other cast iron auto parts etc. material according to ASTM.JIS.BS.DIN standards. and all are OEM auto parts castings made accrding to importers' drawings, samples, or patterns.

  
High-production coremaking is characteristic of the auto castings industry in china. Hot box phenol-formaldehyde coremaking replaced oil-sand cores in china automotive castings indutries. this can improve automotive casting components quality.
  
automotive casting industry's workers should be outfitted with heat-protective clothing and eye and face protection in order to prevent any harm doing to the foundryman workers. now in china. youngagers don't like do foundryman job. they rather like others job which earn less salary than foundryman.because they think foundryman is hardworking, polluted job.we think this is the sames situation must faceed for automotive casting manufacturers india
  
automotive castings Machining in china:
automotive parts machining of engine blocks, crankshafts, transmissions auto clutches castings,auto body casting,and other components is characteristic of the auto industry.

auto parts machining processes are found within various parts manufacturing facilities and are the dominant process in engine, transmission and bearing production. Components such as camshafts, gears, differential pinions and brake drums are produced in machining operations.

One-person machining stations are increasingly replaced by multiple station machines, and CNC machining center is most used in china automotive castings machining workshops. to make sure the automotive castings machining quality is higher and better than automotive casting manufacturers india.
  
Grinding and tool sharpening the auto part castings may present a danger of hard metal disease unless cobalt exposure is measured and controlled. Grinding wheels should be fitted with screens, and eye and face protection and respiratory protective equipment should be worn by grinders. 
  
automotive casting companies in china now can assembled the machined cast iron auto parts into a finished component according to importers requested, but mostly just exporting these automotive casting parts or cast iron car parts without assembling.

automotive wheel hub castings

automotive wheel hub castings

#entry-meta
#post-1151-->

what is OEM castings?

OEM (original equipment manufacturer). Originally, OEM referred to a company which originally designed a given product, which was then this company sold to other companies to rebuilt or rebrand and resell. 

but as time passing. now, OEM is more frequently used to describe those companies in the business of remanufacturing or rebranding a manufacturer's products and selling them to end customers.

OEM castings, means manufacturers make patterns mould toolings according to the originally designed products drawings or samples of the importing company, machining the castings accrding to the importers's drawing and request without modification. and exporting these OEM castings to the vendors back, Alternatively, it may incorporate and bundle the vendor's products with its own technology for resale.

Vendors or say OEM castings importers needs of this type of OEM Castings. At times, major OEM castings vendors will themselves enter OEM arrangements to supplement their product lines. 

take OEM Fire hydrant for example, the OEM fire hydrant manufacturers or say OEM suppliers, typically take vendor's technology into its own applications to make the OEM fire hydrant according to importers drawings, samples or patterns.and assemble the fire hydrant according to vendors' request. and take hydraulic testing according to vendors request. then export these OEM fire hydrants to the vendors for they resale to their end customers.

OEM fire hydrant made in china

OEM fire hydrant made in china

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

by the way, the OEM castings suppliers must sign an OEM agreement with vendors to get the production license for OEM making this product to prevent from any violent of this OEM products' copyright.

Now in China. OEM casting manufacturers can make OEM cast iron pump parts, OEM cast iron pump bowl, OEM cast iron valve parts, OEM cast iron motor parts,OEM cast iron elevator parts, OEM cast iron auto parts, OEM Fire hydrants And OEM bench vises etc. and china export lots of OEM products to USA.EUROPE,JAPAN, SOUTH KOREA.CANADA. etc.

OEM valve castings made in china

OEM valve castings made in china

 

OEM pump castings made in china

OEM pump castings made in china

 

OEM bench vises made in china

OEM bench vises made in china

 

 

 

 

 

 

 

 

 

OEM is also help China manufacturers improved their manufacturing knowhow and manegment system. and hope China OEM industry can change from OEM castings to OEM ready for use finished products.

#entry-meta
#post-1143-->

motor castings foundry in china development situation report

motor castings foundry in china development situation report

in china there are most motor castings foundry all over china countryside,and motor castings foundation in China is very good after more than 30 years developments. 

the motor castings technology is also very advanced in china. say,knowhow on how to control the motor castings fire.

now in china. motor castings foundry can make ductile motor castings,cast grey iron motor castings,motor body casting,motor block casting, motor aluminium castings with die casting and cleaning motor castings,etc.

Motor castings materialaccording to ASTM.DIN,JIS,BS standards, OEM motor castings made according to importers drawigs, samples or pattern toolings.

but we can see that china motor castings foundry skill is also backwords than motor castings usa. that means motor castings inc in USA have very advanced motors castings knowhow and technology than motor castings company in china.

China motor castings foundry should pay much more attention to learn from motor castings usa not only foundry techology but also motor castings knowhow and managemant.and also motor casting repair technology skill.

now in china. the youth people do not like motor castings jobs,because they think motor castings jobs is hards work, dirty work so youngages do not like motor castings job. this caused motor castings foundry short of foundryman workers.and higher salary.


China motor castings foundry or china motor castings company if have the change should take the change of attending casting motor expo 2015,casting motor expo 2016,and casting motor show 2015,casting motor show 2016,so that to promote our motor castings products in casting motor show, and also from there we can learn motor castings technology from developed country so that to improve china motor casting development.

china motor castings foundry motor casings products picture

china motor castings foundry motor casings products picture

#entry-meta
#post-1139-->

china valve castings manufacturers in the cross road

Since China open the door to the outside in 1980. China valve castings manufacturers boomed year by years as they supply valve castings to abroad.

at that time china valve castings manuacturers mainly export to USA. EUROPE.JAPAN,SOUTH KOREA. etc. export price at very lower level. have very good competitive adavnce. lots of valve castings manufacturers growed up from then.

for 30 years valve castings exporting. china valve castings manufacturers learn lots of knowhow on valve castings process,valve casting radiography technology,valve casting defects finding skill.valve casting materials according to ASTM. JIS. BS,DIN standards.

now china valve casting foundry can take almost all kind of valve castings from ball valve castings,industrial valve castings,valve housing castings,valve body castings,globe valve castings,valve box castings, gate valve castings to valve casting vs forging,valve bronze casting,valve die casting,valve investment casting,hydraulic valve castings and radiography of valve castings.

valve castings manufacturers in china's valve casting grades now is at very higher grade. quality very good, delivery on time valve body casting process machining by CNC lathes, valve body casting defects inspection checking have very adanvced tools.

that why lots of valve body casting buyers from the world come to china to cooperated with china valve castings manufactures. from all over the world valve casting importer import their valve castings from china.

but since 2008 the world economic recession. China valve castings manufacturers come to the cross road. and have to face valve casting manufacturers in india compeitition, those valve casting companies in india have some advantage which we do not have. that is lower foundry workers salary. currency change rate against US dollar very lower. these two key factors for valve castings india have very competitive prices thant china valve castings.

so some of valve casting buyers go to india. But China valve castings manufacturers also have our own adavance which casting manufacturers in india not have.

that is we have more than 30 years valve castings exporting history. good quality, transport highway convenient. high level teach foundrymanship. high tech machining CNC equipments.

and we have widely valve casting buyers net we set up through 30 years exporting business. now china valve castings manufacturers must do is improve our valve castings quality, improve our manufacturing management system so that to lower our product cost, delivery on time. so that to do our best to keep china valve castings exporting business as better as before.

valve castings in china

valve castings in china

#entry-meta
#post-1134-->

china bench vises manufacturers face tough competition around the worlds.

China bench vises manufacturers face tough competition around the worlds.

As we know bench vise made in china keep export to USA for many years and have lot of sales.

but recently. China bench vises manufacturers have to face much more tough situation and very hard compeition from those bench vise manufactuers from the worlds. 

such as:bench vise manufacturers india,bench vices suppliers south africa,bench vice suppliers in bangalore,bench vises suppliers in pune,bench vices suppliers-chennai,bench vise suppliers in uae,bench vises suppliers in hyderabad,bench vice supplier in mumbai,etc. 

all these bench vises suppliers' quality is not as good as bench vise made in china. but because those country's bench vises manufacturers have lower salary cost, lower currency change rate against US dollar, all these make china bench vises suppliers in very tough condition.

especially bench vise manufacturers in india. they have almost as same  foundrymanship as china. as same quality bench vices, but they have lower worker cost, lower currency change rate. that make china bench vises manufacturers in a very tough condition. 

but one things that china bench vises suppliers advance have. that is our transport highway can make sure delivery on time. this is our advantage.another is our quality is better than others suppliers.

so from now on, China bench vise manufacturers and suppliers. must enhance our quality control. improve managing system. so that to lower production cost,and enhance QC controle. to make sure quality best, delivery on time. so that to keep china bench vises keep lots of exporting to USA.Europe and Japan market.

bench vises made in china

bench vises made in china

 

 

 

 

 

 

 

 

 

 

Related Readings

American Type Bench Vises

Heavy Duty Bench Vises

Light Duty Bench Vises

Multi-Purpose Bench Vises

GS TUV VPA Approved Bench Vises

England Type Vises

Japan Type Bench Vises

Steel Bench Vises

Table Vises

Other Vises

the key to bench vise mounting

#entry-meta
#post-1130-->

china pumps and motors suppliers have growed up

Since in 1980's China Open to the outside world,China cast iron pump parts exporting trade have boomed, lots of china pumps and motors suppliers grow up since then.

at the beggining, china pumps and motors castings suppliers mainly export OEM cast iron pump body casting,cast iron pump bowl casting,cast iron pump casing casting and cast iron pump impeller castings,pump bowl head castings etc.to the world, made according to importers' drawings, samples or molding patterns toolings.

after thirty years development.now china pumps and motors suppliers'foundry with related machining capability improved .lot of China water pump supplier are specialized in the Sand casting,Lost Wax Casting,and CNC machining for all OEM pump parts or motors parts processing.

pump casting foundry materials range include Gray iron,ductile iron, Carbon steel and Low-alloy steel casting. the material are widely used in pump body casting,pump bowl casting,pump casing casting,pump impeller casting.submersible pump castings parts,vacuum pump casting,centrifugal pump casing,cast iron hand pump parts,cast iron water pump parts,cast iron pitcher pump parts,cast iron well pump parts,cast iron garden pump parts,cast iron pump flanges and cast iron pump bowls,etc.

most of china pumps and motors suppliers can cast and machine castings's weight per piece from 0.5KG to 500KG,but this is just generally speaking.

China pumps and motors suppliers keep export high quality cast iron pump castings parts to North America, South America, Australia, U.K, Europe,

China pumps and motors suppliers now all can take advanced spectra analysis instrument and mechanical property test equipment and can produce high quality and different kinds of casting parts according to ASTM, AISI, DIN, BS, JIS standards.

China pump and motor suppliers now can take sand castings, precision lost wax investment castings for metals including grey iron castings, ductile iron castings,stainless steel,carbon steel, low alloys, copper base alloys, aluminium alloys castings.

Welcome all of world pump manufacturers or pump parts importers come to China to cooperate with china pumps and motors suppliers. you can have a great deal with us. china pump castings suppliers can provide you with hight quality competive prices pump castings.

pump impeller made bychina pumps and motors suppliers

pump impeller made by DLFT china pumps and motors suppliers

#entry-meta
#post-1112-->

fire hydrant manufacturers in china is compete with fire hydrants manufacturers india

Today fire hydrant manufacturers and suppliers in china foundrymanship, and fire hydrants parts machining workmanship and machine equipments is much better, and also china industrial workmanship is better than fire hydrants manufacturers and suppliers india haves .

China inland highway and transport base is much more better than India. that can make sure fire hydrants manufactureres in china can delivery more quick than fire hydrant manufacturers India.Because India inland transport is to poor. and also india international sea port is too poor than China.

But China fire hydrant manufacturers and suppliers face a very tough situation,that is higher foundryman and machining workers' salary. and also higher RMG against USD change rate. but fire hydrants manufacturers india is much better than fire hydrant manufacturers in china at this situation.

So china fire hydrant manufacturers must improve casting workmanship. foundrymanship. machining technology. and managing system so that to lower fire hydrant parts manufacturing cost. and quality control system. so that to delivery higher quality fire hydrants products to compete with fire hydrants manufacturers india supplied.

now from our point of view china fire hydrants supplied quality is better than fire hydrants india. fire hydrant manufacturers in china must take much more attention to quality control. delivery on time so that to keep China fire hydrant advance than india fire hydrants.

fire-hydrants-made-by-china-fire-hydrant-manufacturers

#entry-meta
#post-1106-->

exporting container loading and delivery type

FCL- Full Container Load and LCL-Less Container Load have following four type:

1.FCL/FCL Full container load and full container delivery。

2.LCL/LCL Less container load and less container delivery。

3.FCL/LCL Full container load, Less container delivery. this suit to one exporter delivery material for two or more

importers from one same country and nearby the same port.

4.LCL/FCL Less container load, Full container delivery, suit for two or more exporter from one same country and at nearby same loading port and they have one same importer. they delivery the same importer material at same time and use one same container together to delivery the material to this importer。

#entry-meta
#post-1102-->

NC Machine Using By China Fire Hydrant Valve Manufacturers

Computer Numerical Control(NC) is a form of programmable automation in China Fire Hydrant Valve suppliers and Manufacturers machinining workshop,in which the processing equipment is controlled by means of numbers. Letters and others symbols, The  numbers, letters, and symbols are coded in an appropriate format to define a program for instructions for fire hydrant workpiece changes, the capability to change the program is what makes NC suitable for low volume and medium volume production for fire hydrant machining jobs, and it is much easier to write new program than to make major alternations to the processing equipment for Most China fire hydrant valve suppliers and manufacturers factory's machining workshop.

    The principle of numerical control was applied to the milling process for fire hydrant valve workpieces, and then use to the turning process for fire hydrant valve body workpieces.  drilling the fire hydrant flange holes,these job can make sure the fire hydrant valve quality at very higher level for China Fire Hydrant valve manufacturers exporting fire hydrant valve in worldwide have good reputation.

    the current NC equipments is relatively more mature in most China Fire hydrant valve manufacturers workshop. NC Centers.Many machines pocess multiple processing functions for machining fire hydrant valve component in China Fire hydrant valve  suppliers and manufacturers factory.Such as milling centers which can perform vertical and horizontal milling, Drilling, boring, reaming, slotting, shaping and turning process, of course, with a high capacity automated tooling library, CNC machines' functions can be considerably more abundant by China fire hydrant suppliers and  manufacturers in the future.

CNC MACHINING CENTER

CNC MACHINING CENTER

#entry-meta
#post-1065-->

Most Fire Hydrant illegally abused in USA

In USA When a summer heat wave engulfs New York City, people seek the soothing embrace of water in whatever way they can: they swarm the neighborhood swimming pool; they visit the beach at Coney Island; they take multiple showers. People also tap into the city's water supply through some of its most vulnerable access points: fire hydrants. Wrenching open fire hydrants to frolic in the resulting spray is a summertime custom in cities and suburbs nation-wide—with often unconsidered consequences.   An opened fire hydrant in New York gushes 1,000 gallons of water a minute, draining the same reservoirs that supply kitchens, bathrooms, and—of course—fire hoses. "It's illegal for private citizens to open fire hydrants on their own," says Farrell Sklerov, a spokesman for the Department of Environmental Protection (DEP). "What people are supposed to do is ask for a spray cap from their local firehouse."   Free of charge, NYC firemen will install or lend out perforated caps that cut down a fire hydrant's gushing to 25 gallons per minute, while still providing constant jets of water for the hot and bothered. The caps help prevent water pressure from dropping dramatically in nearby homes and buildings.   "One open fire hydrant on a block will probably not impact water pressure that much," Sklerov explains, "but a significant amount of open fire hydrants impacts water pressure to the point that we get tons of 311 complains." During the July 5–7 heat wave, the DEP received so many 311 hotline complaints about low water pressure that they launched a fleet of teams to shut down more than 1400 opened fire hydrants each day. The city maintains 107,000 fire hydrants throughout the five boroughs.   Sometimes, illegally opened fire hydrants have more dire consequences. The force with which the fire hydrants spout can catch people off guard, knocking them into harm's way. In June 1994, a 3-year-old girl playing in front of an open fire hydrant in Manhattan died after the gushing water flung her into the path of an oncoming sanitation truck, The New York Times reported. Such cases are fortunately rare. The primary objection to opening fire hydrants without spray caps is the sheer waste of resources. In the case of New York, opening fire hydrants illegally doesn't waste much energy, because water travels to the city almost solely by gravity and New York is one of only a handful of major cities that don't rely on expensive artificial filtration systems, since the majority of the city's water comes from naturally filtered and protected sources. For most cities and suburbs, however, uncapped fire hydrants waste precious water and energy—especially during heat waves and droughts. This summer's June was the driest June on record for New York City since June 1999 and, as of July 16, the reservoirs were at 86.4 percent of their capacity, the DEP told The New York Times. Usually, reservoirs are at 93.4 percent capacity in mid-July.   "We understand people want to stay cool," Sklerov says, "but there's an appropriate way to do it: go to local firehouse and they'll hook up a spray cap for you."Technology might facilitate water conservation as well. Some companies are working on a new generation of intelligent fire hydrants that perpetually monitor water usage and sound the alarm if someone tries to open fire hydrant without permission. Smart fire Hydrant, currently in predevelopment, will wirelessly transmit data about leakages and tampering. And the Mi. fire Hydrant by Mueller Systems, recently introduced at the American Waterworks Association trade show, can similarly store and send information about leaks, backflow and other maintenance issues.But Sklerov says the DEP is not currently looking to deploy smart fire hydrants, because the current methods of identifying and resolving illegally opened fire hydrants work just fine.

Posted in FIRE HYDRANT | Tagged

China Fire Hydrant valve manufacturers machining equipments

China Fire hydrant suppliers and manufacturers'basic machines for fire hydrant valve machining is Lathes, The basic machines that are designed primarily to do turning, facing and boring are call lathes. Very little turning is done on other type of machine tool, and as you know the fire hydrant valve upper body, fire hydrant valve lower body and fire hydrant valve middle barrel's flange face all need turning machining,And none can do it with quality facility.Because lath can do boring, facing, drilling and reaming in addition to turning, all these function of the lathe decide that fire hydrant valve suppliers and manufacturers' work main machining equipment for machining fire hydrant valve is lathes.lathes versatility permits several operations to be performed with a single setup of the fire hydrant valve workpiece. this accounts for fact that lathes of various types are more widely used in manufacturing than any others machine tool at fire hydrant valve componets machining job.

Lathes in various forms have existed for more than two thousand years. Modern lathes date from about 1797. When Henry Maudsley developed on with a leadscrew. It provided controlled. mechanical feed of the tool. this ingenious Englishman also developed a changegear system that could connect the motions of the spindle and leadscrew and thus enable threads to be cut.this used for fire hydrant valve upper body ourlet inside thread machining Job and it works very well.so now in China. all China fire hydrant valve suppliers and manufacturers works main machining equipments is lathes.

fire hydrant manufacturers in china

fire hydrant manufacturers in china

Posted in FIRE HYDRANT | Tagged

Strength And Ductility of Material for fire hydrant valve

Capacity of fire hydrant valve component material is related to the most severe service condition it can sustain without a change which will prevent the fire hydrant valve component from continuing its intended function, in most case, loads are the main manifestations of capacity. to assess the load-carrying capacity of the fire hydrant valve component castings suppliers material, here we shall discuss the capacity of engineering materials to sustain loads.

A most informative material test for fire hydrant valve component castings is the simple tensile test. A specimen in the form of a cylindrical bar, machined to a displacement(extension) are recorded. the resulting load-displacement curve for a typical gray iron casting material for cast iron fire hydrant valve component. Assuming constant cross-section of the rod. the same curve related stress and strain.  the curve of this figure does not correspond exactly to the real stress-strain relationship because of the way it is made, that is, we measure force and displacement at interpret them as stress and strain based on the initial length and the initial cross section of the test specimen, these properties continusly change during the experiment therefor the result of such a test will have only a formal value.

For Most material used for  China fire hydrant valve component casting design from this diagram we observe a linear stress strain relationship which extends upto some point, and shortly thereafter one can observe an increasing deformation without a proportional increase in the load and the stress, this roughtly corresponds to the point that we have s substantial yielding of the material and we call this the "yield point". the corresponding stree is called the "yield strength" of the material of fire hydrant valve component casting, we have been intentionally vague in the precise definition of the yield point owing to the fact that in most materials of  fire hydrant component castings it is not possible to identify a simple point where we have the transition from elastic to plastic behavior, in fact in most fire hydrant component materials this transition is not abrupt and it is a matter of definition to specify the yield point.usually we define the yield point as the point where a certain percentage of plastic deformation remain after load.

fire hydrant castings

fire hydrant castings