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我厂铸造车间的革命职工,遵照毛主席的教导,破除迷信,解放思想,结合生产实际初步试验成功球墨铸铁瞬时浇包孕育工艺。于1973年8月～11月试验,并小批试生产,成功地浅注了解放牌汽车后桥壳80余只。对所浇注的每个后桥壳的金相组织均进行了检查,证明采用这种孕育工艺,操作简单,孕育效果良好,即使在孕育量仅为0.03%的情况下,仍能保证在铸态中不出现自由渗碳体,并具有30～40%的铁素体和细小均匀分布的石墨,解决了以前在生产中铸态不能消除自由渗碳体的老大难问题,从而稳定了铸态组织,简化了热处理工序。同时采用这种工艺,还相应地改善了铸态组织提高了浇注温度,减少了废品。另外由于组织的改善,反映出机械性能的提高。
Revolutionary workers in our foundry’s workshop obeyed the teachings of Chairman Mao to break away from superstition and emancipate their minds. In August 1973 ~ November test, and a small batch of trial production, the successful shallowly explained the liberation of more than 80 vehicles after the bridge shell only. The casting of each rear axle shell of the microstructure were examined to prove that the use of this breeding process, simple operation, good effect of inoculation, even at a gestational weight of only 0.03% of the case, can still be guaranteed in the as-cast Does not appear free cementite, and with 30 to 40% of ferrite and fine uniform distribution of graphite to solve the previous production in the cast can not eliminate the problem of free cementite, which stabilizes the as-cast structure , Simplifying the heat treatment process. At the same time using this process, but also to improve the cast structure to improve the pouring temperature, reducing waste. In addition, due to the improvement of the organization, it reflects the improvement of the mechanical properties.