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低压铸造是利用气体压力将金属液压人铸型,并使铸件在一定压力下结晶凝固的一种特种铸造方法。利用这种方法不仅可以获得比一般重力铸造质量更高的铸件,而且可以铸出一般重力铸造难以成形的大型薄壁复杂铸件。同时低压铸造所用浇注系统十分简单,可使金属的利用率大大提高,通常可在90％以上。 低压铸造技术因设备投资少,上马快,并可得质量较高的铸件,故已渐广泛地应用在铸造生产上。GNLD型法式灯罩外壳低压铸造模具的试模成功,是一个实例。
Low-pressure casting is the use of gas pressure metal hydraulic casting, and make the casting under a certain pressure crystallization solidification of a special casting method. With this method, not only the castings of higher quality than ordinary gravity castings but also the castings of large thin-wall complex castings that are difficult to form by gravity gravimetry can be cast. At the same time, the pouring system used in low-pressure casting is very simple, which can greatly improve the utilization rate of metal, usually over 90%. Low pressure casting technology due to less investment in equipment, launched fast, and available high quality castings, it has been gradually used in casting production. GNLD-type French lamp shell low-pressure die casting mold success is an example.