动车组轮对压装过程中边缘效应的危害及措施

Harm and Measure of Edge Effect in Process of Wheel and Shaft Press Mounting of Multiple Units

应用有限元方法对CRH3型动车组非修形轮对和修形轮对的压装过程进行了仿真分析,结果表明非修形轮在压装过程至始至终都存在边缘效应,边缘效应使压装过程中的边界应力大大超过了轮对的屈服极限,因此,边缘效应是轮对压装过程中引起轮轴之间的擦伤,甚至拉伤的原因之一;对轮对接触表面进行对数修形可有效地避免或大大降低压装过程的边缘效应,从而可大大减少拉伤的可能性;合理的修形量在避免边缘效应的同时,可保证压装力符合铁标的要求.

The process simulations of wheel and shaft press mounting of multiple units CRH3 are conducted by finite element method without Logarithmic modification and with Logarithmic modification. The results of the simulations show that edge effect appears during the process of wheel and shaft press mounting without logarithmic modification, and the stress maximums caused by edge effect excess greatly yield limit of the wheel and shaft materials, which arose scratch and even pull of wheel and shaft. Edge effect can be reduced or even avoided with Logarithmic modification and rational Logarithmic modification can guarantee the demand for press fnrce ordained by the standard of Railway Ministry. while decrease the pull possibility of wheel and shaft.