Casting is a metal smelting process, usually by using the gravity of the metal in the mold for casting. But “aluminum die-casting” is not done by gravity, it’s done by pressure. It’s kind of like injection molding. But it has a higher technical content of the core, cooling and other systems. In general, materials are delivered through a centralized inlet into the cavity to be cast and “molded” to form the part.
Aluminum has a history of more than 100 years since it was discovered by the Danish scientist H.C.Orsted in 1825. It has been more than 100 years since the Hall-Heroult method was developed in 1886 to industrially extract aluminum
First, the difference:
1.Selection of release agent (Taiwan Dunhuang Youyan issued pure aluminum special release agent, very easy to use)
2.Keep the temperature of the molten soup (the temperature in the soup should be kept above 720 degrees as far as possible, and the temperature measuring rod should be made of carbonized material, which is not easy to be eroded and enclosed by the aluminum soup)
3.Crucible in melting furnace should be made of graphite material is not easy to cause the temperature difference is too large.
4.The mold surface temperature should not exceed 220 degrees.
5.The cooling time after ejection should not be too long, but the ejection time after mold opening should be within 0.3sec for fins.
6.The die feed port is thicker than the general ADC12 feed port.
7.The smoother the flow field when the flow passage and the feed port are discharged, the better.
8.Spray as far as possible with automatic spray, otherwise die surface temperature is not easy to maintain (the difference is very large)
9.Die cast aluminum is cast aluminum alloy, with some alloying elements casting properties and mechanical properties are better than pure aluminum.
Two, the advantages of die casting aluminum:
1, good product quality: casting dimensional accuracy is high, generally equivalent to 6~7 level, even up to 4 level; Good surface finish, generally equivalent to 5~8 level; The strength and hardness are high, and the strength is generally increased by 25~30% compared with sand casting, but the elongation is reduced by about 70%; Stable size, good interchangeability; Die – cast aluminum thin – walled complex castings. For example, the current minimum wall thickness of zinc alloy die casting aluminum parts can reach 0.3mm; Aluminum alloy casting up to 0.5mm; The minimum cast aperture is 0.7mm; The minimum pitch is 0.75mm.
2, high production efficiency: high machine productivity, such as domestic JⅢ3 horizontal cold air die casting machine can die casting aluminum 600 ~700 times in an average of eight hours, small hot chamber die casting machine can die casting aluminum 3000~7000 times in an average of eight hours; Die casting aluminum mold has a long life, a set of die casting aluminum mold, die casting aluminum bell alloy, life can reach hundreds of thousands of times, even millions of times; Easy to realize mechanization and automation.
- Excellent economic effect: Due to the precise size of die-casting aluminum parts, the surface is glossy and clean. Generally no longer for mechanical processing and direct use, or processing volume is very small, so it not only improves the metal utilization rate, but also reduces a large number of processing equipment and man-hours; Castings are cheap; Aluminum can be combined with other metal or non-metal materials. It saves both assembly time and metal.