熔模精密铸造无切削阀板  

Precision Casting Valve Plate with Cutting-Free

作　　者：朱苏 

机构地区：[1]石家庄恒业机电有限公司

出　　处：《特种铸造及有色合金》2013年第9期827-828,共2页Special Casting & Nonferrous Alloys

摘　　要：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。Investment casting 3Cr13 valve plate with culling-free was conducted though using silica sol as the binder and middle-temperature wax pattern, which required the valve plate and the sealing surface without any defect and not to use the welding repair grinding method to repair the seal surface. In the trial production process, there exists the size deviation, beans, pitting surface. Through strictly controlling the investment process parameters and the workshop environment temperature, low temperature treatment for shell before dewaxing, controlling shell baking and pouring temperature, dimension of valve plate size met tolerance range. Beans were eliminated by breathing at the first stuccoing and prewetting at the second stuccoing. Through lighting wood to cover tin bucket to realize the casting solidification in reducing atmosphere, the pitting surface was eliminated.

关 键 词：精密铸造 型壳 阀板 尺寸公差 金属豆 麻坑 

分 类 号：TG249.5[机械工程—精密仪器及机械] TG26[金属学及工艺—铸造]