球铁电梯转子铸造工艺改进

Casting Method and Process Improvement of Nodular Iron Rotor Used for Elevator

球铁电梯转子铸件原采用呋喃树脂砂生产,发现有缩松及夹渣缺陷。对缺陷产生的原因进行了分析,认为夹渣可能是由于呋喃树脂砂往铸件表层渗S引起,轴孔缩松是由于该处热节采用树脂砂芯冷却较缓慢引起,为此对铸造工艺进行了如下改进:改用湿粘土砂自动造型线造型,轴孔热节采用铁芯激冷,浇注系统设置泡沫陶瓷过滤,采用边浇冒口补缩。用改进的工艺生产后,彻底解决了转子铸件的缩松及夹渣缺陷,提高了铸件成品率和生产效率,降低了生产成本,取得了很好的经济效益。

The nodular iron rotor used for elevator was produced formerly with furan resin sand and shrinkage porosities and slag inclusion were revealed in the castings. The reasons causing defects was analyzed and it was considered that the slag defect was caused due to the sulphur penetrating from furan resin sand into surface of the casting,and the shrinkage porosity was caused due to the slow cooling rate of furan resin sand core used in the hot spot of the shaft hole. Therefore,the casting method and process were improved as follows:using automatic green clay sand moulding line for moulding,using cast iron core to chill the hot spot of the shaft hole,setting ceramic foam filter in the gating system,and using side riser to feed casting. After adopting above mentioned improvements,the shrinkage porosity and slag inclusion problems were totally solved and thereby the casting yield ratio and productivity were increased,the production cost was reduced that brought very good economical benefits.