全钢载重轮胎模具上盖刚度及疲劳寿命分析

通过对硫化时全钢载重轮胎模具上盖受力分析，并根据板壳理论中圆形薄板计算理论，得出上盖最大挠度和应力的计算公式。利用有限元模拟验证上盖的刚度，通过计算得到不同材料上盖的最小厚度和疲劳寿命。结果表明：不同材料上盖的最小厚度不同，45锻钢和Q235钢上盖最大变形量均小于0.05 mm，满足上盖刚度设计要求；45锻钢上盖最小厚度比Q235钢上盖减小1 mm，疲劳寿命延长2.09%，使用寿命延长2.22%，45锻钢上盖使用性能较优。;Based on the stress analysis of the top cover of truck and bus tire mold under the curing condition and the calculation theory of circular thin plate in the theory of plate and shell，the formula for calculating the maximum deflection and stress of top cover was obtained. The finite element simulation was used to verify the stiffness of top cover，and the minimum thickness and fatigue life of the top cover with different materials were obtained by calculation. The results showed that，the minimum thickness of the top cover with different material was different.The maximum deformation of 45# steel and Q235 steel top cover was reduced by 0.05 mm，which met the design requirements of top cover stiffness.Compared with Q235 steel top cover，the minimum thickness of 45# steel top cover was 1 mm less，the fatigue life was extended by 2.09%，the service life was extended by 2.22%，and the 45# steel top cover had better performance