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为了研究闭挤式精冲直齿轮时产生塌角的原因,通过有限元模拟和网格实验的方法,分析了闭挤式精冲直齿轮齿顶端和齿根端材料的流动特点,研究了精冲过程中的反顶力、分流降压腔和外环填充率对塌角成形的影响规律。结果表明:由于摩擦力引起的材料流动不均匀而导致直齿轮塌角的出现。塌角高度与反顶力、坯料外环填充率成反比,和分流降压腔成正比关系。因此,在闭挤式精冲过程中,适当增加挤压反顶力和坯料外环填充率大小,减小坯料分流降压腔尺寸可以有效减小塌角高度。
In order to study the cause of collapsing of closed-type fine blanking spur gear, the characteristics of the material flow at the top and the base of close-spun fine blanking gear were analyzed by means of finite element simulation and grid experiment. In the process of flushing the anti-top force, shunt buck chamber and outer ring filling rate of the impact of the law of the collapse. The results show that the occurrence of spur gear spalling due to non-uniform material flow caused by friction. The height of the collapse angle is inversely proportional to the anti-top force and the filling rate of the outer ring of the blank, which is in direct proportion to the shunt pressure reducing chamber. Therefore, during the process of closed-type fine blanking, the extrusion back-jacking force and the filling rate of the outer ring of the blank are appropriately increased, and the reduction of the size of the buck manifold can effectively reduce the height of the collapse.