叉车变速箱体消失模铸造粘砂缺陷的控制

Control of Sand Penetration Defects on Transmission Housing of Forklift with Lost Foam Cast

通过消失模铸造方法生产的叉车变速箱体存在比较严重的粘砂缺陷,缺陷主要集中在法兰盘和箱体的拐角、凹槽、死角等部位。分析缺陷后确认为机械粘砂,并提出了控制缺陷的措施。通过调整浇注温度、涂层厚度、型砂紧实度、负压大小、浇注速度等工艺因素,大大减少了箱体粘砂缺陷,并避免了因粘砂缺陷导致铸件报废的情况,提高了铸件成品率。

There were serious sand penetration in the transmission housing of forklift produced by lost foam casting （LFC）,and the defects concentrated in the positions such as flange,comer,recess,dead angle,etc.The defects were determined to be metal penetration after analyzing and the control measures were put forward.The defects of the sand penetration were greatly decreased by adjusting pouring temperature,coating thickness,sand degree oframming,negative pressure,pouring rate,etc.,which avoided the castings reject resulted from the sand penetration and improved the castings yield.