螺旋桨是船用推进器,它由三至四瓣具有空间螺旋面的叶片,与中央轴毂结合为一整体。过去螺旋桨生产,采用砂型浇铸,由于技术要求高,铸件叶瓣的加工余量大,因此加工过程复杂,劳动量大,生产周期长。去年在技术革新运动中,我们试验成金属型离心 The propeller is a marine propeller which consists of three to four lobes with a space helical surface integrated with the central hub. The past propeller production, the use of sand casting, due to high technical requirements, casting leaves the machining allowance large, so the process is complex, labor-intensive, long production cycle. Last year in the technological innovation movement, we experimented with metal-type centrifugation