Pressure casting (referred to as Die-casting) is the essence of high-pressure, the liquid or semi-liquid metal at a higher rate of filling Die-casting cavity, and under pressure forming and solidified casting method to obtain.
High-pressure and high-speed Die casting are the two major characteristics. It is commonly used pressure injection pressure from a few thousand to tens of thousands of kPa, or even up to 2 × 105kPa. Filling speed of about 10 ~ 50m / s, sometimes even up to 100m / s or more. Filling time is very short, usually in the range of 0.01 ~ 0.2s. Compared with other casting methods, Die casting has the following three advantages:
1，Good product quality
Casting size precision, generally equivalent to 6 to 7, or even up to 4; the surface finish is good, generally equivalent to 5 to 8; strength and hardness are higher, the intensity of sand casting than the general increase of 25 to 30% Rate reduced by about 70%; dimensional stability, good interchangeability; can cast thin-walled complex castings. For example, the current minimum thickness of zinc alloy Die-castings up to 0.3mm; aluminum alloy castings up to 0.5mm; minimum casting aperture of 0.7mm; the minimum pitch of 0.75mm.
2，High production efficiency
High productivity, such as domestic JⅢ3 horizontal cold Die casting machine can be an average of eight hours 600 to 700 times, small hot chamber Die-casting machine can be an average of every eight hours of Die-casting 3000 ~ 7000 times; Die-casting long life, Die-casting bell alloy, the life of up to hundreds of thousands of times, or even millions of times; easy to achieve mechanization and automation.
3,The economic effect is fine
Due to the precise size of the Die casting, table Pan Guangjie and so on. Generally, no longer mechanical processing and direct use, or processing volume are small, it not only improves the metal utilization but also reduces a lot of processing equipment and working hours; casting prices will be easy; can be combined with other metal or non-metallic materials. Saving assembly work and metal.