半钢轮胎模具上盖刚度及疲劳寿命分析

Analysis of stiffness and fatigue life on semi steel tire mould

通过轮胎模具在硫化工况下的上盖受力分析,根据板壳理论中圆形薄板计算理论,简化了半钢轮胎模具上盖受力模型,推导出半钢轮胎模具上盖刚度计算公式。通过计算不同上盖材料的最小厚度及其疲劳寿命,运用有限元数值模拟验证其刚度。根据上侧板材料和结构装配形式,运用有限元模拟计算其疲劳寿命,得到45锻钢比Q235材料疲劳寿命长以及整体式上盖上侧板结构比通过螺栓连接结构疲劳寿命长的结论。模拟结果能够指导上盖设计,掌握模具实时工作状态。

The simplified stress model of the top plate of the semi steel tire mould was proposed according to the stress analysis of the top plate under the vulcanization of the tire mould and the calculation theory of the circular plate in the plate and shell theory, and the formula for calculating the cover stiffness was deduced. The minimum thickness and fatigue life of different top plate materials were calculated, and the stiffness was verified by finite element simulation. Considering the material of top side plate and assembly structure, the fatigue life was also calculated by finite element simulation. It was concluded that the fatigue life of the 45 forging steel is longer than Q235 and the fatigue life of side plate structure of the overall top plate is longer than of the bolt connection structure. The design of the upper cover can be guided and the working status of the mould can be grasped according to the simulating results.