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die casting process

There are four major steps in the die casting process. First the mold is sprayed with lubricant and closed. The lubricant both helps control the temperature of the die and it also assists in the removal of the casting. Molten metal is then shot into the die under high pressure; between 10 -- 175 Mpa.


Once the die is filled the pressure is maintained until the casting has solidified. The die is then opened and the shot (shots are different from castings becaure there can be multiple cavities in a die, yielding multiple catings per shot) is ejected by the ejector pins.


Finally, the scrap, which includes the gate, runners, sprues and flash, must be separated from the casting. This is often done using a special trim die in a power press or hydraulic press. An older method is separating by hand or by sawing, which case grinding may be necessary to smooth the scrap marks. A less labor-intensive method is to tumble shots if gates are thin and easily broken; separation of gates from finished parts must follow. This scrap is recycled by remelting it. Approximately 15% of the metal used is wasted or lost due to a variety of factors.


post by: Miss Rita                         email:  sino9@cnmould.com