大型中空箱体铸件的消失模铸造工艺

Processing Design of EPC Large Hollow Case Castings

采用消失模铸造工艺生产大中型中空铸件,可以大大简化生产工序,节约木模制作成本,缩短生产周期。但是,中空大型箱体类铸件的消失模铸造常常出现塌箱、胀箱、浇不足等缺陷。对于此类铸件应采用特殊工艺措施,比如在中空部位增设抽气管路、加大压头、加重压铁、设置特殊浇注系统结构等,可有效地减少或消除铸造缺陷,提高铸件品质和出品率。

Large and medium-sized hollow castings,such as lathe bed castings on machine tool,were produced increasing in EPC,in which processing operation could be simplified greatly with a lower production cost due to the absence of wooden pattern preparation as well as a shorter production cycle.However,there exists casting defects frequently such as downslide,swell,misrun and so on,resulting in rejection,in the production of large and medium-sized hollow casting in EPC.For such castings,the special measures should be considered,including adding exhausting-channel or other mechanism,enlarging pressure head,increasing pressure-iron as well as setting special gating system,which could effectively reduce or decrease casting defects,improving the quality of castings and qualified rate.