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运用有限元分析软件分析了闭挤式精冲直齿轮齿顶端和齿根端剪切变形区材料的应力应变状态,以及凸凹模间隙、反顶力和外环填充率对齿顶撕裂的影响。结果表明:随着凸模下行,齿顶处静水压应力逐渐下降,齿顶附近侧面由于三面受摩擦力出现拉应力,导致静水压应力不足进而出现裂纹,另外加工硬化也会导致齿顶裂纹的出现;齿顶裂纹出现的几率与凸凹模间隙大小成正向关系,与反顶力和外环填充率大小成反向关系。研究发现,随着反顶力和外环填充率的增加以及凸凹模间隙的减小,可以有效控制裂纹的出现。
The stress and strain state of the materials in the shear deformation zone at the tip and root end of the closed-crowned precision-blanking spur gear were analyzed by using the finite element analysis software and the effect of the clearance, the anti-tip force and the outer-ring filling rate on the tooth-tip tear . The results show that with the downward movement of the punch, the hydrostatic stress at the addendum gradually decreases, and the tension near the addendum due to the friction on the three sides causes the hydrostatic stress to be insufficient and cracks occur. In addition, work hardening also causes the addendum The emergence of cracks; the probability of occurrence of tooth top cracks and the punch and die gap size is a positive relationship with the anti-top force and outer ring filling rate inversely proportional to the size. It is found that the appearance of cracks can be effectively controlled with the increase of the anti-tip force and the filling rate of the outer ring and the decrease of the clearance between the punch and the die.