Study on the stiffness of the involute serration on the shaving cutter
|關鍵字:||刮齒刀;插槽;有限元素法;Shaving Cutter;Serration;Finite Element Method|
Shaving cutting is widely used in the gear manufacturing. However, due to the low stiffness of the shaving cutter, there are several quality issues, such as the poor gear profile or short life cycles. Nowadays, serration is made by straight type process on shaving cutter. The surfaces of the gear profile edge and the serration bottom face are not parallel. There are different lengths on each point of the serration. In this study, we modified the shaving cutter shape from the straight line to the involute line. The surfaces of the gear profile edge and the serration bottom face are parallel, so that each point of the serration has the same length. Through changing the shape of the shaving cutter, we expect it will have lower stree concentration and longer life cycle. In this study, we used the strain gauge to measure the strain around the serration. On the other hand, the CAE simulation was also used to compare the stiffness of the serration between the straight line and the involute line. According to the experiment and simulation results, the average strain value around the serration is 1.71E-4 in involute-line case and 2.15E-4 in straight-line case. The strain value around the serration in the involute-line case is smaller than that in the straight-line case. In the straight-line serration analysis case, the strain on the testing point close to the pitch circle is obviously higher than that on the other testing points. It will be tremendously affect the gear profile and cutter life. In the involute-line serration analysis case, the strain is more stable on each testing point. That means the involute-line structure would increase the stiffness of serration and improve the gear profile.