在生产带导轨的机床床身及组合机床的滑座体等较大铸件时,在导轨末端(以内浇口为始端)往往会产生气孔和渣孔等缺陷。其主要原因是浇注这些较长的铸件时,铁水要沿着导轨流过较长的一段路程,这样势必会降低铁水的温度,特别是先浇入的铁水温度下降更多,使铁水的流动性变差,在这种情况下,先浇入的铁水(冷铁水)就会卷 In the production of machine tools with rails and the combination of machine tools and other large castings casting body, at the end of the guide rail (beginning with the gate) often have defects such as porosity and slag holes. The main reason is that pouring these longer castings, the molten iron to flow along the rail for a long period of time, it is bound to reduce the temperature of hot metal, especially the first poured hot metal temperature drops more, so that the fluidity of hot metal Worse, in this case, the first poured into the hot metal (cold hot metal) will roll