传动片冲裁凸模所受应力与疲劳寿命的研究

以汽车离合器中的弹性零件传动片为研究对象,建立传动片冲裁凸模疲劳分析的有限元模型,利用ANSYS Workbench有限元软件模拟了传动片冲裁凸模的应力分布状况及疲劳寿命。数值模拟结果表明,采用结构改善后的凸模,使得过渡圆角区域的最大应力值由1109.2 MPa减小为1058.6 MPa,凸模的疲劳寿命由75715次提高到120400次。借助冲压级进模得知,结构改善后冲裁凸模的疲劳寿命试验值为107493次,与模拟值之间的相对误差为10.72%,从而验证了数值模拟的正确性。此外,基于改善后凸模结构对传动片冲裁凸模进行标准化,其对企业传动片冲压级进模的设计具有重要的指导意义。

Research on stress and fatigue life for blanking punch of strap

For elastic parts of strap in automobile clutch, the finite element model of fatigue analysis for blanking punch was established, and the stress distribution and fatigue life of blanking punch for strap were simulated by software ANSYS Workbench. The simulation re-sults show that the maximum stress at the transition fillet reduces from 1109. 2 MPa to about 1058. 6 MPa by using punch with improved structure, and the fatigue life of punch increases from 75715 times to 120400 times. However, when the punch with improved structure is used to the progressive die to produce strap, its fatigue life is 107493 times, and the relative error between simulated value and experimen-tal value is 10. 72%. Therefore, the correctness of numerical simulation is verified. In addition, the blanking punch of strap with im-proved structure is standardized, and it has an important guiding significance on the progressive die design for strip.