重型自卸车副车架强度分析及轻量化设计

Strength analysis and optimization of sub-frame of heavy dump truck

为了提高某重型自卸车副车架的可靠性,采用UG软件对自卸车卸货过程进行运动仿真,获得自卸车举升装置的加载曲线和副车架受最大载荷时推力油缸的位置;利用Hyper Mesh软件建立副车架的有限元分析模型,计算初始举升、货物下滑临界工况下副车架的应力分布和变形量。基于有限元仿真结果,以初始举升工况为设计工况对副车架进行尺寸优化,支撑梁的最大应力从477.2 MPa降至313.6 MPa。研究结果显示:通过对副车架进行尺寸优化,实现了满足强度前提下副车架轻量化的设计要求,为产品的后续设计提供了依据。

In order to improve the sub-frame’s reliability of a heavy dump truck,the unloading process of the dump truck was simulated by UG software,and the loading curve of the dump truck lifting device and the position of the thrust cylinder when the subframe was under the maximum load were obtained;The finite element analysis model of the sub-frame was established by using HyperMesh software to calculate the stress distribution and deformation of the sub-frame under the critical working conditions of initial lifting and cargo sliding.Based on the finite element simulation results,taking the initial lifting condition as the design condition,the size of the sub-frame was optimized,and the maximum stress of the support beam was reduced from 477.2 MPa to 313.6 MPa.The research results show that through the size optimization design of the sub-frame,the design requirements of light weight of the sub-frame on the premise of meeting the strength were realized,which provided a basis for the subsequent design of the product.