我厂生产的汽车起动机及发电机的外壳,占孔工序后,占孔出口在外壳内圆上留下了毛刺。为了要很好的除掉它竟成为生产过程中的一个关键问题。我们原用锉刀进行清除毛刺的工作,耗费了不少的手工劳动时间。更重要的是:手工去毛刺,势必会在制件内壁上留下锉刀痕迹,破坏了内孔的表面光洁度,影响了产品的质量。这时,我学习了《矛盾论》。毛主席 I plant production of the starter motor and generator shell, accounting for the hole after the process, accounting for the export hole in the shell left a burr on the circle. In order to get rid of it well into the production process has become a key issue. We used to clean the file burr work, spent a lot of manual labor time. More importantly: manual deburring, will inevitably leave a file on the wall traces of parts, destroyed the surface finish of the inner hole, affecting the quality of the product. At this moment, I learned “Contradiction Theory”. Chairman Mao