 The following are the four steps in traditional die casting , also known as high @-@ pressure die casting , these are also the basis for any of the die casting variations : die preparation , filling , ejection , and shakeout . The dies are prepared by spraying the mold cavity with lubricant . The lubricant both helps control the temperature of the die and it also assists in the removal of the casting . The dies are then closed and molten metal is injected into the dies under high pressure ; between 10 and 175 megapascals ( 1 @,@ 500 and 25 @,@ 400 psi ) . Once the mold cavity is filled , the pressure is maintained until the casting solidifies . The dies are then opened and the shot ( shots are different from castings because there can be multiple cavities in a die , yielding multiple castings per shot ) is ejected by the ejector pins . Finally , the shakeout involves separating the scrap , which includes the gate , runners , sprues and flash , from the shot . This is often done using a special trim die in a power press or hydraulic press . Other methods of shaking out include sawing and grinding . 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 . The yield is approximately 67 % . 
