The essence of die-casting aluminum ingot is to fill the cavity of die-cast aluminum ingot with liquid or semi-liquid metal at a higher speed under high pressure, and form and solidify under pressure to obtain castings.
Features of die-cast aluminum ingot
High-pressure and high-speed filling of die-cast aluminum ingots are the two major characteristics of die-cast aluminum ingots. Its commonly used injection pressure is from several thousand to several tens of thousands kPa, even as high as 2×105kPa. The filling speed is about 10~50m/s, and in some cases it can even reach more than 100m/s. The filling time is very short, generally in the range of 0.01~0.2s. Compared with other casting methods, die-cast aluminum ingots have the following three advantages:
advantage:
1. Good product quality
The dimensional accuracy of castings is high, generally equivalent to 6~7, even up to 4; the surface finish is good, generally equivalent to 5~8; the strength and hardness are higher, and the strength is generally 25~30% higher than sand casting, but it is extended The rate is reduced by about 70%; the size is stable and the interchangeability is good; it can die-cast aluminum ingots with thin-walled complex castings. For example, the current minimum wall thickness of zinc alloy die-cast aluminum ingots can reach 0.3 mm; aluminum alloy castings can reach 0.5 mm; the minimum casting aperture is 0.7 mm; and the minimum pitch is 0.75 mm.
2. High production efficiency
The machine has high productivity. For example, the domestic JⅢ3 horizontal cold-air die-casting aluminum ingot machine can die-cast aluminum ingots 600-700 times in eight hours on average, and the small hot-chamber die-casting aluminum ingot machine can die-cast aluminum ingots 3000-7000 times per eight hours on average; The ingot type has a long life. A pair of die-cast aluminum ingot type, die-cast aluminum ingot clock alloy, the life span can reach hundreds of thousands of times, or even millions of times; it is easy to realize mechanization and automation.
3. Excellent economic effect
Due to the precise dimensions of the die-cast aluminum ingots, the surface is smooth and clean. Generally, it is used directly without mechanical processing, or the processing volume is small, so it not only improves the utilization rate of metal, but also reduces a large number of processing equipment and man-hours; metallic material. It saves not only assembly man-hours but also metal.