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简单介绍精密压铸工艺及其优点Simple introduction of precision die c

2016-01-15 14:02:11 点击:
一种将熔融合金液倒入压室内,以高速充填钢制模具的型腔,并使合金液在压力下凝固而形成铸件的一种精密铸造法。精密压铸具有如下优点:
1. 产品质量好   
        铸造件尺寸精度高,一般相当于6~7级,甚至可达4级;表面光洁度好,一般相当于5~8级;强度和硬度较高,强度一般比砂型铸造提高25~30%,但延伸率降低约70%;尺寸稳定,互换性好;可压铸薄壁复杂的铸件。例如,当前锌合金压铸件最小壁厚可达0.3mm;铝合金铸件可达0.5mm;最小铸出孔径为0.7mm;最小螺距为0.75mm。   
2.生产效率高   
        机器生产率高,例如国产JⅢ3型卧式冷空压铸机平均八小时可压铸600~700次,小型热室压铸机平均每八小时可压铸3000~7000次;压铸型寿命长,一付压铸型,压铸钟合金,寿命可达几十万次,甚至上百万次;易实现机械化和自动化。   
3.经济效果优良   
         由于压铸件尺寸精确,表泛光洁等优点。一般不再进行机械加工而直接使用,或加工量很小,所以既提高了金属利用率,又减少了大量的加工设备和工时;铸件价格便易;可以采用组合压铸以其他金属或非金属材料。既节省装配工时又节省金属。

Press the molten alloy mixture to a indoor, filling at high speed steel mould cavity, and make the liquid alloy solidification under pressure and form a precision casting process of casting. Precision die casting has the following advantages:

1. The products are of good quality

Casting dimension precision is high, generally equivalent to 6 ~ 7 magnitude, even can reach level 4; Good surface finish, general equivalent to level 5 ~ 8; The strength of the strength and hardness is higher, is generally 25 ~ 30% higher than that of sand mold casting, but the elongation decrease about 70%; Size stability, good compatibility; Can die casting thin wall complex casting. For example, the current minimum zinc alloy die casting wall thickness of 0.3 mm; Aluminum alloy castings can be up to 0.5 mm; The smallest cast out of the pore size of 0.7 mm; The minimum pitch of 0.75 mm.

2. High production efficiency

Machine productivity high, such as domestic J Ⅲ type 3 horizontal cold empty die casting machine die casting of 600 ~ 600 times on average eight hours, small hot chamber die casting machine die casting of 3000 ~ 3000 times on average every eight hours. Die casting type long life, a pair of die casting, die casting alloy, life can reach hundreds of thousands of times, or even millions of times; Easy to realize mechanization and automation.

3. The good economic effect

Due to the die casting dimension precision, table is bright and clean, etc. Mechanical processing and no longer have commonly used directly, or processing capacity is small, so can not only improve the utilization rate of metal, and reduce a lot of processing equipment and working hours; The casting price is easy; Combination die casting can be used in other metal or non-metallic materials. Save the assembly time and save the metal.