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根据东风EQ140汽车后桥从动螺旋锥齿轮生产实践，介绍该锻件使用D51-400通用扩孔机辗扩成形过程中缺陷产生原因及消除方法。
According to the production practice of driven spiral bevel gear in the rear axle of Dongfeng EQ140 automobile, the reasons and solutions to the defects in the process of rolling and forming by D51-400 universal reaming machine are introduced.