【摘要】 以EM250型高压均质机五缸曲轴为研究对象，通过理论计算确定其工作载荷。利用Opti Struct进行计算，曲轴的最大应力为218.4 MPa，小于材料屈服强度极限345.0 MPa，满足静强度要求，但不满足连续工作5 y的疲劳强度要求。在考虑经济性的前提下，提出在曲轴的中间位置增加支撑方式的改进办法，计算改进前、后曲轴的最大应力值和寿命。通过计算，增加曲轴支承方式后，曲轴的最大应力从218.4 MPa降低到118.1 MPa，降幅高达46%，提高了疲劳使用寿命，满足设计要求。更多还原

【Abstract】 The five-cylinder crankshaft of EM250 high pressure homogenizer is taken as the research object. The working load is determined through theoretical calculation. Calculating using OptiStruct, it is found that the maximum stress of crankshaft is 218.4 MPa,which is less than the material yield strength limit of 345 MPa, meeting the requirements of static strength, but it does not meet the fatigue strength requirements for five consecutive years; On the premise of considering economy, an improved method of adding support mode at the middle position of crankshaft is proposed. The maximum stress value and service life of crankshaft before and after improvement are calculated by finite element analysis software. Through calculation, after adding the crankshaft support mode, the maximum stress of the crankshaft is reduced from 218.4 MPa to 118.1 MPa, with a decrease of 46%, which improves its fatigue service life and meets the design requirements.更多还原