自一九七三年六月起,我们对燃烧室头部零件(见图1)进行了低压铸造试验,并在试验中对金属模的结构、涂料、变质剂、复盖剂以及充型速度、充型压力、增压压力和增压时间等项工艺参数,进行了一些探讨,初步掌握了一些规律,使这项工艺用于批生产,零件合格率达到了80％左右。 Since June 1973, we conducted a low-pressure casting test of the combustion chamber head part (see Figure 1) and tested the structure, coating, modifier, covering agent and filling speed , Filling pressure, supercharging pressure and pressurization time and other process parameters, some discussions were made and some laws were initially mastered to make the process suitable for batch production. The qualified rate of parts reached about 80%.