Pressure Die casting is abbreviated as die casting, which is a casting method in which molten alloy liquid is poured into a press chamber, the cavity of a steel mold is filled at high speed, and the alloy liquid is solidified under pressure to form a casting.

Molds are usually made of higher-strength alloys, and this process is somewhat similar to injection molding.

The metals used for die casting mainly include zinc, copper, aluminum, magnesium, lead, tin, and lead-tin alloys. The upper mass limits for die-casting using aluminum, copper, magnesium, and zinc are 70 lbs (32 kg), 10 lbs (4.5 kg), 44 lbs (20 kg), and 75 lbs (34 kg), respectively.

Depending on the type of die casting, you need to use a cold chamber die casting machine or a hot chamber die casting machine. The difference lies in how much force they can withstand, the typical pressure range is between 400 to 4000 tons.

Die Casting Process

The main characteristics of die casting that distinguish it from other casting methods are high pressure and high speed.

①The molten metal fills the cavity under pressure, and crystallizes and solidifies under higher pressure. The common pressure is 15-100MPa.

②The molten metal fills the cavity at a high speed, usually 10-50 meters per second, and some can exceed 80 meters per second, (the linear velocity of the cavity through the inner gate-the inner gate speed), so the molten metal The filling time is extremely short, and the cavity can be filled in about 0.01-0.2 seconds (depending on the size of the casting).

Die Casting

The cost of casting equipment and molds is high, so the die-casting process is generally only used for mass production of a large number of products. Die casting is particularly suitable for manufacturing a large number of small and medium-sized castings, so die casting is the most widely used one among various casting processes. Compared with other casting technologies, the die-casting surface is flatter and has a higher dimensional consistency.

Die Casting Parts