着重研究了椭圆形刀顶曲线的形状对齿根弯曲应力的影响，并以减小最大齿根弯曲应力为目标，对椭圆形刀顶曲线的形状参数进行了优化设计。应用边界单元法，分别计算了普通圆弧形刀顶及椭圆形刀顶加工出的齿轮的齿根弯曲应力，应力分析结果表明：使用具有最优参数的椭圆形刀顶的刀具加工出的齿轮，其最大齿根弯曲应力比普通齿轮的最大齿根弯曲应力降低了１０．１％ Focusing on the influence of the shape of the oval knife-edge curve on the bending stress of the tooth root, the shape parameters of the oval knife-edge curve are optimally designed with the goal of reducing the maximum root bending stress. The boundary element method is used to calculate the root bending stress of the gear machined by the ordinary arc knife blade and the oval knife blade respectively. The stress analysis results show that the gear with the oval knife blade with the best parameters , The maximum root bending stress than the average gear tooth root bending stress decreased by 10.1%