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Iron Casting, Ductile Iron Manufacturer – Cheng Feng

Cheng Feng Casting Factory Co., Ltd. is a professional ductile iron casting company with main product of castings for machinery industry, such as casting iron, ductile irons, gray iron casting, ductile iron casting, small iron casting products, large machine casting parts and more.

 

For more than thirty years, Cheng Feng has dedicated in upgrading of foundry technology to their casting iron and ductile iron products. Pursuing new frontier has long been Cheng Feng’s company policy. They commit to improve product quality and meet the clients’ strict requirement.

 

Cheng Feng Casting offers all kind of castings services with high quality, best design and competitive price. OEM/ODM orders are accepted. Please contact us for more ductile iron casting products information.

 

“Quality Comes First” is not slogan. It is what makes up Cheng Feng’s competing edge in today’s turbulent competition. Looking for the reliance manufacturer of iron castings and ductile irons, Cheng Feng is you best choice. They can offer quality casting, best service and competitive price to their customers. For further casting information, please contact soon!

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What Do You Know about a Gravity Die Casting?

With sand casting the mold is broken up after each casting operation, but with the process known as gravity die casting, the mold also called a ‘die’ is manufactured from metal, and can be used a large number of times. This means that the die is much more expensive to make, than an expendable ‘one use only’ mold. An intermediate technique makes use of semipermanent molds, which are made of gypsum plaster or fireclay, which can be used repeatedly for a limited number of castings. With gravity die castings, the most widely used materials for die-making are cast iron, steel, and heat resisting alloys of iron. For some specific purposes other materials are used to manufacture the dies, and these can include, aluminum, copper or graphite. A metal die can produce smooth castings with a clean surface, and a very high dimensional accuracy. Gravity die castings require very little or no final machining or other finishing treatment. The service life of metal dies can vary in terms of the number of castings it can produce, and this depends on certain factors such as the casting material, the thermal metal shock resistance of the die material, the temperature at which it is poured, and the casting method employed.

Many different details need to be taken into consideration when designing the pattern from which the die is made. For instance the pouring-gate system and risers need to be considered so that the walls of mold allow a quenching action upon the molten metal so it van solidify more rapidly than in sand casting. Also the die must be provided with channels at the joints and air vent holes to allow air from the hot metal to escape from the interior of the die. The die must also be constructed so it will not restrict the shrinkage that occurs, when the metal cools. Shrinkage can present difficulties when designing the cores which form the casting. Usually the cores are made from steel or special alloys, and sometimes compressible sand or shell cores are used.

To prevent the casting metal from sticking to the die, the die can be given an internal coating of chalk, clay, or bone ash with water glass as a binder. This mixture can be applied to the die by spraying, brushing or immersion.

With simple castings the molten metal may be poured in at the top. It should be designed to allow the molten metal to flow quickly without turbulence into all parts of the die. For metals with low melting points the die is sometimes heated to prevent premature solidification, and for metals with a high melting point, the die may have to be artificially cooled after each casting operation.

Slowly moving or tilting the die while casting can reduce turbulence and enable the metal to flow more smoothly, particularly when heavy castings are being produced. For awkwardly shaped castings, a vacuum may be applied to help the filling of the die. Slush casting, is a technique used for producing ornamental or hollow castings: the molten metal is poured into the die, and when a solid shell of sufficient thickness has formed, the remaining liquid is poured out.

Although die castings are cheaper than sand castings, the die tooling is more expensive, and an optimum number of castings need to be produced to make the process cost effective.

 

Article Source: http://EzineArticles.com/?expert=John_Cheesman
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Function of Metal Stamping Dies

Metal stamping dies are the devices used in metal stamping machines. Each metal stamping machine can have one or more than one dies depending on the kind of machine. Dies are the main components in metal stamping machines that do the actual casting, punching, cutting and shaping of the metal sheet.

The basic die operations are drawing, shearing and bending. In metal stamping, the metal sheets are placed in a die or a press tool which has a specially designed cavity that gives the preferred shape to the metal sheet. The upper part of the die connects to the press slide while the lower component connects to the press bed. A specific component known as the punch pushes the metal sheet through the die, thus performing the actual shaping operation. The patterns on the dies can be used to emboss or give three-dimensional lettering on the final product.

Dies are placed in sheet metal panels either alone or as a series of presses in a press line. Metal stamping die and press can have different input variables on the bases of tonnage, press parallelism, shut height, nitrogen pressure in dies, counterbalance pressure and press speed. These variables can influence the quality of the stamping panel, particularly during die setup. The same stamping press can be reused by replacing one set of dies with another.

The placement of dies in a press is known as die setup. Die setup decides the shut height and binder force. The number of components produced in a die setup is known as a batch.

There are many different kinds of dies such as single station dies, multiple station dies, compound dies, progressive dies and tandem press lines. Most dies are designed by the metal stamping companies who use advanced technologies like CAD to design them according to customer specifications. Another classification of dies is draw dies, trim dies and cam-pierce dies.

More Metal Stamping Dies Info

 

Article Source: http://EzineArticles.com/?expert=Josh_Riverside

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