Die Casting

   Die Casting

     Die casting involves the preparation of components by injecting molten metal at high pressures into a metallic die.China CNC machining  Die casting is closely related to permanent mould casting, in that both the processes use reusable metallic dies. In die casting, as the metal is forced in under pressure compared to permanent moulding, it is also called pressure die casting'. Because of the high pressure involved in die casting, any narrow sections, complex shapes and fine surface details can be easily produced.

    In die casting, the die consists of two parts. One called the stationary die or cover die which is fixed to the die casting machine. China CNC machining  The second part called the ejector die is moved out for the extraction of the casting. The casting cycle starts when the two parts of the die are apart. The lubricant is sprayed on the die cavity manually or by the auto lubrication system. The two die halves are closed and clamped. The required amount of metal is injected into the die. After the casting is solidified under pressure the die is opened and the casting is ejected.

    The die casting machines are of two types: hot chamber die casting, and cold chamber die casting. The main difference between these two types is that in hot chamber, the holding furnace for the liquid metal is integral with the die casting machine, whereas in the cold chamber machine, China CNC machining the metal is melted in a separate furnace and then poured into the die casting machine with a ladle for each casting cycle which is also called 'shot'.

  Fig. 6.9 Operation sequence of hot chamber process