Die casting refers to the molten alloy in high pressure, high speed conditions filled mold cavity, and under high pressure cooling molding casting method, casting process is the most widely used, the fastest growing metal hot forming process. Die casting as an advanced non-ferrous alloy precision parts forming technology, to adapt to the modern manufacturing industry, product complexity, precision, lightweight, energy saving, green requirements, application areas continue to widen. With the continuous improvement of the level of die-casting equipment and process technology, the application of die-casting products on the basis of the existing will continue to expand.
The advantages of die casting include the casting with excellent dimensional accuracy. Usually this depends on the casting material, the typical value is the initial 2.5 cm size when the error is 0.1 mm, and the error is increased by 0.002 mm for each additional 1 cm. Compared to other casting processes, its cast surface is smooth, rounded radius of about 1-2.5 microns. Molds with a wall thickness of about 0.75 mm can be made with respect to sandbox or permanent die casting. It can directly cast the internal structure, such as silk sets, heating elements, high-strength bearing surface. Other advantages include the ability to reduce or avoid secondary machining, production speed, casting tensile strength of up to 415 MPa, can cast high-mobility metal.
The biggest drawback of die casting is the high cost. Casting equipment and molds, mold-related components are very expensive relative to other casting methods. So the manufacture of die-casting when the production of a large number of products is more economical. Other shortcomings include: This process is only applicable to the higher mobility of metal, and casting quality must be between 30 grams and 10 kg. In the usual die casting, the final cast of a batch of castings will always have pores. And therefore can not carry out any heat treatment or welding, because the gas within the gap will be under the action of heat expansion, resulting in internal micro-defects and surface stripping.
Die casting is a precision casting method that uses high pressure to force metal melt into a complex metal mold. In 1964, the Japanese die-casting association for the die-casting is defined as “high temperature will melt alloy into the precision molds, in a short time mass production of high precision and excellent casting casting method.” The United States that die-casting DieCasting, the United Kingdom said the pressure casting for the PressureDieCasting, and most of the domestic general practitioners are familiar with the Japanese argument, known as die-casting. Castings made by die casting are called die pieces (Diecastings).
The tensile strength of these materials, nearly twice as high as ordinary cast alloys, aluminum alloy wheels for the car, the frame and other hope to use higher strength impact resistant material production components, have a more positive significance.
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