立式加工中心VMC850B灰铸铁床身气孔问题的解决

Removal of Blowholes in VMC850B Gray Iron Bed for Vertical Machining Center

对立式加工中心VMC850B灰铸铁床身原铸造工艺进行了分析,并利用数值模拟技术对铸件的流动场进行了模拟。结果表明,铁液中的氧化物夹杂是床身产生气孔缺陷的主要原因。针对这一主因,调整了铸件的浇注系统和熔炼工艺,采取控制原材料质量、加强排气及规范操作等措施,显著地减少了床身的气孔缺陷。

The original casting process used for VMC850B gray iron bed of a vertical machining center was analyzed.The flow field in the casting was numerically simulated.It was concluded that the formation of blowhole in the bed casting was mainly attributed to oxide inclusion in molten iron.In view of the above,the casting process was again laid down,the gating system and melting process for the castings were adjusted,and some measures such as controlling quality of raw materials,strengthening air-out,and standardizing operation had been adopted.As a result,blowholes in the bed were considerably reduced.