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以硅溶胶为粘结剂精密铸造3Cr13阀板,不进行切削加工,要求阀板和密封面无任何铸造缺陷,不得用焊补修磨方法修复密封面。在试制生产过程中曾出现尺寸超差、凹角金属豆、表面麻坑等缺陷。通过采取严格控制蜡模工艺参数,控制车间环境温度,脱蜡前型壳低温处理、型壳焙烧温度和浇注温度,使铸件尺寸稳定在了公差范围内。沾浆时第一遍浆吹气,第二遍浆预润湿消除了金属豆缺陷。浇注后点燃木屑盖铁皮桶,消除铸件表面麻坑缺陷。
Casting silica sol as a binder 3Cr13 valve plate, not cutting, requiring valve plate and sealing surface without any casting defects shall not be repaired by welding repair repair surface. In the trial production process has appeared size tolerance, concave angle metal beans, surface Ma Hang and other defects. Through the strict control of wax process parameters, the control of the workshop temperature, low temperature before dewaxing shell processing, shell roasting temperature and pouring temperature, the size of the casting stability within the tolerance. The first pass when blowing pulp blowing air, the second pass pre-wet metal beans to eliminate defects. After pouring lit wood lid tin bucket, eliminating the casting surface defects pit.