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液态挤压铸造,是把液态金属注入金属模腔,然后把模腔内的液态金属迅速加压成型,在压力下结晶。它是锻造和铸造相结合的工艺,亦称为液态金属模锻。该工艺发展历史虽久,但长期不被重视。近几年来,国外在运输机械、船舶制造、宇宙航空及兵器工业等生产领域中,有了广泛的应用,但在我国尚属一项年轻的工艺。本文所谈的齿轮泵壳体,壁厚达30～40mm,采用金属型重力铸造或低压铸造时,存在缩孔、疏松等缺陷,废品率常达30～50％。采用液态挤压后,铸件质量显著提高,废品率下降到3％左右,机械性能也有所改善,能满足用户要求。
Liquid squeeze casting, the liquid metal is injected into the metal mold cavity, and then the liquid metal cavity rapid pressure forming, crystallization under pressure. It is a combination of forging and casting process, also known as liquid metal forging. The process of development for a long time, but long-term is not taken seriously. In recent years, foreign countries have a wide range of applications in the fields of transportation machinery, shipbuilding, aerospace and weaponry industries, but it is still a young craft in our country. In this paper, the gear pump housing, the wall thickness of 30 ~ 40mm, the use of metal gravity casting or low pressure casting, there are shrinkage, porosity and other defects, the rejection rate often up to 30 to 50%. After using liquid extrusion, casting quality significantly improved, rejection rate dropped to about 3%, mechanical properties also improved, to meet user requirements.