DIE CASTING PROCESSES

The traditional die-casting process mainly consists of four steps, also known as high-pressure die-casting. These four steps include mold preparation, filling, injection, and sand drop, which are also the foundation of various improved die casting processes. During the preparation process, it is necessary to spray lubricant into the mold cavity, which can not only help control the temperature of the mold but also assist in demolding the casting. Then the mold can be closed and the molten metal can be injected into the mold under high pressure, with a pressure range of approximately 10 to 175 megapascals. After the molten metal is filled, the pressure will be maintained until the casting solidifies. Then the push rod will push out all the castings, as there may be multiple cavities in a mold, multiple castings may be produced during each casting process. The process of sand removal requires the separation of residues, including the molding port, runner, gate, and flash. This process is usually completed by a special trimming mold to squeeze the casting. Other methods of sand removal include sawing and polishing. If the gate is relatively fragile, you can directly hit the casting, which can save manpower. The excess mold mouth can be reused after melting. The usual yield is approximately 67%.