High-pressure and high-speed die-casting aluminum die casting are the two major characteristics of die-casting aluminum. Its common injection specific pressure is from a few thousand to tens of thousands of kPa, and even up to 2 x 105 kPa. Filling speed is about 10 ~ 50 m / s, sometimes even up to 100 m / s or more. The filling time is very short, generally within the range of 0.01 to 0.2 seconds.
1, Good product quality: Castings have high dimensional accuracy, generally equivalent to 6 to 7 grades, and even up to 4 grades; surface finish is good, generally equivalent to 5 to 8; strength and hardness are high, and strength is generally higher than sand casting. ~30%, but the elongation is reduced by about 70%; dimensional stability, good interchangeability; can cast aluminum thin-walled complex castings, for example, the current zinc alloy die-casting aluminum parts minimum wall thickness of up to 0.3 mm; aluminum alloy castings up to 0.5 Millimeters; minimum cast hole diameter 0.7 mm; minimum pitch 0.75 mm.
2, high production efficiency: high machine productivity, such as domestic JIII3 horizontal cold die-casting aluminum die-casting machine can die-cast aluminum 600 to 700 times on average, small die-cast aluminum die-casting machine can die-cast aluminum 3000 ~ 7000 times every eight hours; Die-cast aluminum long life, a die-cast aluminum, die-cast aluminum alloy clock, life expectancy of up to hundreds of thousands of times, or even millions of times; easy to achieve mechanization and automation.
3, The economic effect is excellent: As the precision of die-casting aluminum parts is precise, the advantages of surface polishing are generally no longer used for mechanical processing and are used directly, or the processing volume is very small, so the metal utilization rate is increased, and a large amount of processing equipment is reduced. Working hours; Castings are inexpensive; Combinatorial die-casting aluminum can be used to save both man-hours and metal savings from other metal or non-metal materials.
1, When die-casting aluminum, due to high liquid metal filling cavity speed and unstable flow conditions, general aluminum die casting method is used. Castings are easy to produce pores and cannot be heat treated.
2, for concave complex castings, die-casting aluminum is more difficult
3, high melting point alloys (such as copper, ferrous metals), die-cast aluminum life is lower;
4, not suitable for small-scale production, the main reason is the high cost of die-cast aluminum manufacturing, aluminum die-casting machine production efficiency, low-volume production is not economical.