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Producing Precision Castings with Die Casting
2016-03-18

As far as we know, die casting is a universal non-expendable technique. In the technique, metal are forced into the mold cavity under high pressure. And die casting molds can be used repeatedly to produce castings in a variety of sizes, shapes, and wall thickness. Besides, the molds cavities are precisely designed to produce complex shapes with accuracy, surface finish and attractiveness. Previously, die casting only uses low pressure injection method, but now high pressure techniques such as squeeze casting and semi-solid casting methods are applied in this field. What is more, only tin and lead were die cast in the past, but today magnesium, copper and other alloys are also cast by this process.

In this process, molten metal or other materials are forced into the cavities of the steel mold under high pressure. Dies are two part molds-the fixer die half and the ejector die half. The die or mold is fabricated with the impression of the component that is to cast. Generally, there are four types of dies: single cavity to produce one component; multiple cavity to produce a number of identical parts; unit die to produce different parts at one time; combinations die to produce several different parts for an assembly.

Well, the molten metal is injected into the die under high pressure and high speed, which helps in producing a casting that is smooth and precise as the original mold. The pressure is maintained on the mold until the hot metal solidifies. When the metal is hardened, the die is opened to remove the casting.

Commonly, there are several variations on the basic process that can be used to produce castings for specific application. The first one is squeeze casting. This is a method by which molten alloy is cast without turbulence and gas entrapment at high pressure to yield high quality, dense, heat treatable components. The other process called semi-solid molding. This is procedure where semi-solid metal billets are cast to provide dense, heat treatable castings with low porosity.

Ever coin has two sides, so does die castings. It has both advantages and disadvantages. On one hand, it is a economical process that can be used for a wide range of complex application, and the parts made by technique have longer service life, dimensional accuracy and close tolerance. Besides, this process can be fully automated without any post machining. Meanwhile, the mold can be used repeatedly. However, on the other hand, the casting must be smaller than 600 mm, and the weight must be between 30 grams. Also, it is high initial cost and limited to high-fluidity metals. more information, you are suggested to visit www.tosing-casting.com