锥形电机定子内锥面校形失效分析及校形装置设计

Failure analysis of motor core sizing process on inner cone surface and the sizing tools design

针对生产现场部分定子冲片叠铆内锥面校形失效问题,从冲片生产工艺、伺服数控分度冲切工装模具刃口形式及冲切断面状态变化等分析,得出冲切线毛刺变化、冲片翘曲状态及冲片错位叠压等因素的不确定性是导致冲片叠铆后层间综合摩擦系数不一致性的根本原因,同时叠铆预压过程中会产生弹性垫片效应,出现轴向弹性预压紧力,另外锥形校形模具(塞棒模具)作用于内锥面的压力存在轴向分力,上述合力所产生的片间摩擦力有可能大于塞棒模具施加在冲片上的水平分力,导致校形失效。基于上述研究,重新设计了一套适用于自动生产线的气动式外圆柱面校正装置,避免了校形模具对冲片的轴向压力,达到了自动找正的冲片同轴校形的目的,研究结论解决了实际生产中的工艺可靠性问题。

Aiming at the failure of inner cone surface of stator punch sheets riveting in production site,from the punching production process,the cutting edge form of the servo numerical control punch cutting tool,and the state change of the punching and cutting surface,etc,the uncertainty of factors such as tangent burr change,buckling condition,and plate dislocation overlying was analyzed as the fundamental reasons for comprehensive friction coefficient between the layers of the inconsistency.At the same time,in the process of riveting stack preloading might produce effect of elastic gasket and axial elastic preloading force,another cone sizing tool(stopper tool)effect on the inner cone of axial component of the pressure.The friction force between the plates might be greater than the horizontal component force exerted on the punching plate by the plug die,resulting in the sizing failure.Based on the above research,a set of pneumatic cylindrical surface correction device for automatic production line was redesigned,which avoided the axial pressure of the sizing tool and achieved the goal of self-alignment of the punch sheet.The research results effectively solved the process reliability problems in actual production.