16.1 Spring cap

Aluminum suitable for die casting process is die cast aluminum, usually die cast aluminum alloy. It has a set of high technical content of core withdrawal, cooling and other systems. In general, the material is delivered through a central inlet to the cavity to be cast into the "injection" to form the part. Casting is a process of metal smelting, usually using the gravity of the metal to cast in a mold. But the "aluminum die casting" is not done by gravity, but by applying a certain pressure. Kind of like injection molding.

High pressure and high speed filling die casting aluminum mold are the two main characteristics of die casting aluminum. Its commonly used injection pressure is from thousands to tens of thousands of kPa, and even up to 2×105kPa. Filling speed is about 10~50m/s, and sometimes it can even reach more than 100m/s. The filling time is very short, generally in the range of 0.01~0.2s. Its advantages include:

1, good product quality: casting size accuracy is high, generally equivalent to 6~7, or even up to 4; Good surface finish, generally equivalent to 5~8; The strength and hardness are higher, the strength is generally increased by 25~30% compared with sand casting, but the elongation is reduced by about 70%; Stable size, good interchangeability; Die cast aluminum thin-walled complex castings.

2, high production efficiency: high machine productivity, such as the domestic JⅢ type horizontal cold air die casting aluminum machine can die casting aluminum 600~700 times in an average of eight hours, small hot chamber die casting aluminum machine can die casting aluminum 3000~7000 times in an average of eight hours; Die casting aluminum type long life, a die casting aluminum type, die casting aluminum bell alloy, life can reach hundreds of thousands of times, even millions of times; Easy to realize mechanization and automation.

3, the economic effect is excellent: due to the accurate size of the die-cast aluminum parts, the table is smooth and clean. Generally, it is no longer used directly for mechanical processing, or the processing amount is very small, so it not only improves the metal utilization rate, but also reduces a large number of processing equipment and working hours; Castings are cheap; Aluminum can be used in combination with other metals or non-metallic materials. Saves assembly time and metal.