Die casting is a kind of precision casting method which uses high pressure to force molten metal into a metal mold with a complex shape. Die casting is a metal casting process in which high pressure is applied to the molten metal using the cavity of the die. Molds are usually made from stronger alloys, a process somewhat similar to injection molding. Most die casting castings are iron-free, such as zinc, copper, aluminum, magnesium, lead, tin, and lead-tin alloys and their alloys. Depending on the type of die casting, either a cold chamber or a hot chamber die casting machine is required.
The advantages of die casting:
1. Product quality is good
Casting size precision is high, generally equivalent to 6~7 grade, or even up to 4 grade; Good surface finish, generally equivalent to 5~8 level; The strength and hardness are high, the strength is generally 25~30% higher than that of sand casting, but the elongation is reduced by about 70%. Stable size, good interchangeability; Die casting for thin-walled complex castings. For example, the current minimum wall thickness of zinc alloy die castings can be up to 0.3mm; Aluminum alloy castings up to 0.5mm; The minimum casting aperture is 0.7mm; The minimum pitch is 0.75mm.
2. High machine productivity, such as domestic JⅢ3 type horizontal cold air die-casting machine eight hours on average can die-casting 600~700 times, small hot chamber die-casting machine every eight hours on average can die-casting 3000~7000 times; Die casting mold long life, a set of die casting mold, die casting bell alloy, life can reach hundreds of thousands of times, or even millions of times; Easy to realize mechanization and automation.
3. Excellent economic effect
Due to the precise size of the die casting, the table is smooth and clean. Generally, no longer mechanical processing and direct use, or the processing are very small, so not only improves the metal utilization rate but also reduces a lot of processing equipment and man-hours; Casting price is cheap; Combination die-casting with other metallic or nonmetallic materials can be used. Both save assembly time and save metal.