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在惰性气体保护下,对薄壁和形状复杂的高强度铝硅合金进行低压铸造。由于减少了氧化物的生成,该方法使得铝水的流动性较之一般的大气低压铸造法提高了近一倍;由于铸件致密性的改善,比起传统的低压铸造,利用惰性气体低压铸造所得到的铸件的延伸率增至2～3倍,疲劳强度几乎为原来的10倍。并且,用该方法可以低速浇铸。因此,铸造时可采用比较脆弱的铸模和型芯。该方法保证了很好的流动性,因而适宜于精密铸造。 本文所介绍的低压铸造装置可用来提高铝水的流动性并避免氧化物夹渣和气孔等缺陷。铸模的浇包和铸造箱在铸造前自动地密封、抽空并用惰性气体充压。抽空有助于铝水的脱气。在微型计算机的控制下,以最佳速度给气体加压,使铝水升入铸模。利用该装置成功地铸造了象高速涡轮的叶轮这类需要很高质量的薄壁而形状复杂的零件。
Under the protection of inert gas, thin-walled and complex shape of high-strength aluminum-silicon alloy for low-pressure casting. Due to the reduced oxide formation, this method allows the flow of aluminum water than the average low pressure atmospheric casting nearly doubled; due to the improvement of the compactness of the casting, compared with the traditional low-pressure casting, the use of low-pressure inert gas casting The resulting elongation of the casting increased to 2 to 3 times the fatigue strength of almost 10 times the original. Also, this method allows low-speed casting. Therefore, when casting can be used more vulnerable molds and cores. This method guarantees good fluidity and is therefore suitable for precision casting. The low-pressure casting device described in this paper can be used to improve the flow of aluminum water and avoid defects such as oxide slag and porosity. Molded ladle and casting box are automatically sealed prior to casting, evacuated and filled with inert gas. Taking time out helps to degas the aluminum water. Under the control of a microcomputer, the gas is pressurized at the optimum speed to cause the aluminum water to rise into the mold. The device is used to successfully cast thin-walled, complex-shaped parts requiring high quality, such as impellers for high-speed turbines.