一、前言 随着科学技术的发展,用铸造方法生产的复杂零件日益增加,而且对铸件的要求也越来越高。 反压铸造是依靠压力差升液、充型、并在所要求的压力场下结晶凝固。并可控制压力容器中的气体介质的气氛,这样使冶金质量和铸造工艺参数皆可得到控制,这种铸造方法为获得高质量铸件创造了良好的条件。 I. INTRODUCTION With the development of science and technology, the complicated parts produced by the casting method are increasing day by day, and the requirements for the castings are also getting higher and higher. Back pressure casting is to rely on the pressure differential liquid, filling, and in the required pressure field crystallization solidification. And can control the atmosphere of the gas medium in the pressure vessel, so that metallurgical quality and casting process parameters can be controlled. This casting method creates good conditions for obtaining high quality castings.