The main characteristics of aluminum alloy die casting different from other casting methods are high pressure and high speed. Compared with other methods, we have summarized the advantages and disadvantages of die casting:

Advantages of aluminum alloy die casting

1. Aluminum alloy die castings are of good quality

The dimensional accuracy of castings is high, which is generally equivalent to 6? 7, even up to 4; Excellent surface finish, generally equivalent to 5? 8； High strength and hardness, generally 25? Higher than that of sand casting? 30%, but the elongation decreases by about 70%; Stable scale and good interchangeability; Thin wall composite castings can be die cast. For example, the current zinc alloy die castings have a minimum wall thickness of 0.3 mm. Aluminum alloy casting, larger 0.5mm; The minimum casting hole diameter is 0.7 mm and the minimum spacing is 0.75 mm.

2. High die casting capacity

High machine productivity. For example, the domestic horizontal cold air pressure casting machine can die cast 500-700 times on average, and the small hot chamber die casting machine can die cast 3000-7000 times every 12 hours. The die casting die has a long service life and is a die casting die. Die casting alloy, with service life of hundreds of thousands or even millions of times; Easy to mechanization and automation.

3. Excellent economic benefits

Due to the accurate dimension and smooth surface of die castings. Generally, it is no longer used directly for machining, perhaps the processing volume is small, which improves the utilization rate of metal and reduces a large number of processing equipment and working hours; Casting price is easy; The combined die casting can be used for other metal or non-metal materials to save assembly time and metal.

4. Widely used

It is applied to all kinds of new energy electric vehicles, automobile and motorcycle accessories, communication cavity, telecommunication equipment, radiator, LED display frame, LED lamp lighting, furniture, large audio equipment, industry, medical equipment, electrical appliances, motor support and motor accessories. In the light weight trend of the automotive industry, giant Tesla also purchased 6500 tons of die-casting machines to produce automobile casings, and the company also purchased 3500 tons of aluminum alloy die-casting machines, which will be put into production in Dongguan in December.

Disadvantages of aluminum alloy die casting

1. Generally, heat treatment is not allowed

The porosity of die castings cannot be heat treated because the two primary characteristics of die castings are high pressure and high-speed filling.

2. High initial cost

The initial cost is quite high. Before starting mass production, we need to invest in molds.

3. Low longevity

Die casting alloys with low life and high melting point (such as copper and ferrous metals) have greatly increased defects in die-casting products with the passage of time.

4. Not suitable for small batch production

The main reason is that the manufacturing cost of die-casting mold is high, the production power of die-casting machine is high, and small batch production is uneconomical.