小曲率球面零件数控渐进成形缺陷问题研究

Research on Defects of Spherical Parts with Small Curvature by NC Incremental Forming

小成形角零件加工是渐进成形中的一个难点,零件在成形时存在较大的内部压应力以及明显的回弹现象,易产生鼓包问题。通过对小曲率球面零件精度问题的分析可知,如何消除零件中心产生的鼓包是提高精度的关键问题。试验分别采用补偿、更换成形工具头和正成形等方案对零件成形精度进行优化,发现这几种方法均可以有效地消除鼓包问题,显著提高成形零件的精度,且各方案均有其自身的优点,在实际生产中可根据不同的精度要求选择不同的解决方案。

The forming process of small forming angle parts is one of the difficulties in NC incremental forming.Center bulge was generated easily during the forming process because of the pressure stress and springback.Small curvature spherical part was investigated through experiments,how to eliminate the center bulges was the key issue to improve the accuracy.The compensation methods,changing the forming tool and positive forming were used to optimize the forming size,and results show these methods are very effective to eliminate the center bulges and improve the accuracy through experiments,and all methods have their own advantage.So according to the accuracy requirements,different methods can be chosen in the actual production.