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长期以来,在我国,由于压铸件本身中总是存在气孔的缺陷,所以它们经常地只是局限于一些装饰零件,受载荷不大的零件的制造,故压铸铝合金的牌号发展一直停留在几个型号上。但是,随着生产的发展,压铸技术的掌握,人们在扩大压铸件的应用范围方面提出了更多的要求,如在自行车减轻自重的结构改进中,很重要的措施之一就是用铝合金代替钢材制作自行车的零件。而这种零件的大量生产使人们想起了压力铸造的制造工艺。如自行车曲柄,闸叉等零件,不但在工作时承受较大的载荷,而且还要求零件能表面着色处理,具有较好的装饰性,类似的生产发展需要就使压铸铝合金向着高强度、能装饰处理等特性方面扩充新的型号。
For a long time, in our country, due to the defects of stomatal defects in die-casting itself, they are often confined to some decorative parts and manufactured by parts with little load. Therefore, the development of die-casting aluminum alloy has been stuck in several Model. However, with the development of production and the grasping of die-casting technology, more requirements have been put forward to expand the application range of die-casting parts. One of the most important measures in the structural improvement of bicycles is to use aluminum alloy instead Steel production of bicycle parts. The mass production of such parts reminds people of the pressure casting manufacturing process. Such as bicycle crank, brake fork and other parts, not only bear a greater load at work, but also requires parts to surface coloring, with good decorative, similar to the needs of the development of production to die-casting aluminum alloy toward the high strength, energy Decoration and other features to expand the new model.