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肇庆市广东仪表厂采用液态金属挤压铸造方法制造气动仪表铝环室已多年。实践证明,这种铸造方法有如下优点: (1)铸件质量好,可防止缩孔、气孔等缺陷;组织比金属型铸造制得的铸件致密,机械强度高,气密性好;表面光洁度可达7。 (2)材料利用率高,可达90％;没有浇注系统,较金属型铸造可节省大量加工工时。 (3)对合金牌号、浇注温度要求不严。 (4)对炉料纯度要求较低,可大量利用回炉料。主要设备为一台100吨立式油压机,见图。
Zhaoqing City, Guangdong Instrument Factory liquid metal squeeze casting method of manufacturing pneumatic instruments aluminum ring chamber has been for many years. Practice has proved that this casting method has the following advantages: (1) castings of good quality, to prevent shrinkage, porosity and other defects; organization than the metal castings made of dense, high mechanical strength, good air tightness; surface finish can be Up to 7. (2) high material utilization, up to 90%; no casting system, compared with metal casting can save a lot of processing time. (3) the alloy grades, lagging temperature lax requirements. (4) low requirements on the charge purity, can make extensive use of the back charge. The main equipment for a 100-ton vertical hydraulic machine, see figure.