The characteristics of pressure casting

The characteristics of pressure casting

Pressure casting has two major characteristics: high-pressure and high-speed filling pressure casting molds. Its commonly used injection specific pressure ranges from several thousand to tens of thousands of kPa, and even up to 2 × 105kPa. The filling speed is about 10-50m/s, and sometimes it can even reach over 100m/s. The filling time is very short, usually within the range of 0.01 to 0.2 seconds.

Compared with other casting methods, die casting has the following three advantages:

Good product quality

The dimensional accuracy of castings is high, generally equivalent to levels 6-7, and even up to level 4; Good surface smoothness, generally equivalent to grades 5-8; The strength and hardness are relatively high, and the strength is generally increased by 25-30% compared to sand casting, but the elongation is reduced by about 70%; Stable size and good interchangeability; Can die cast thin-walled and complex castings. For example, the minimum wall thickness of current zinc alloy die castings can reach 0.3mm; Aluminum alloy castings can reach 0.5mm; The minimum casting aperture is 0.7mm; The minimum pitch is 0.75mm.

High production efficiency

The machine has high productivity, for example, the domestically produced J-III3 horizontal cold chamber die casting machine can die cast 600-700 times on average in eight hours, and the small hot chamber die casting machine can die cast 3000-7000 times on average every eight hours; Die casting molds have a long lifespan, with a pair of die casting molds and die cast bell alloys having a lifespan of several hundred thousand times, or even millions of times; Easy to achieve mechanization and automation.

Precision machining