Cold forming processis used more for making solid part and sleeve.It is seldom used to make parts with step hole.The EPB drive part is a step hole part with the similar holes, the forming analysis software bigger hole is on the side of surface form.It's hard to produce. The process was designed and simulated with cold forming analysis software Deform3D.
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伍飞,潘静.异形台阶孔件的成形工艺与数值模拟[J].机床与液压,2016,44(2):40-42. . Cold Forming Process and Simulation of Dysmorphism Part with Step Hole[J]. Machine Tool & Hydraulics,2016,44(2):40-42