Die casting process Traditional die casting has four steps, also called high pressure die casting. These are also the basis of any die casting variants: die preparation, filling, ejection and shaking. The mold is prepared by spraying lubricant into the mold cavity. Lubricants not only help control the temperature of the mold, but also help remove castings. The mold is then closed and molten metal is injected into the mold under high pressure. 10 to 175 MPa (1,500 to 25,400 psi). After the mold cavity is filled, the pressure is maintained until the casting solidifies. Then open the mold and eject the top mold through the ejector pin (the top mold is different from the casting, because there may be multiple cavities in the top mold, and each top mold produces multiple castings). Finally, the elimination process involves separating scrap (including gates, runners, gates, and flash) from shots. This is usually done in a power press or hydraulic press using a special finishing mold. Other methods of shaking include sawing and grinding. The less labor-intensive method is to roll off the lens if the door is thin and easily broken. The gate must be separated from the finished product. These waste materials are recycled by remelting. The yield is about 67%. High pressure injection causes rapid filling of the mold, which is necessary, so the entire cavity is filled before any part of the casting solidifies. In this way, even if the shape requires a thin section that is difficult to fill, discontinuities can be avoided. This creates the problem of air entrainment, because when the mold is quickly filled, the air has little time to escape. This problem can be minimized by arranging ventilation holes on the parting line. However, even in the highly refined process, there will still be some pores in the center of the casting. Most die casting machines perform other auxiliary operations to produce features that are not easy to cast, such as tapping, polishing, electroplating, polishing, or painting.

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