超精密摆线轮成型磨床人造花岗岩床身瞬态热应力分析

摘要

The thermal deformation is one of important factors by which the comprehensive accuracy of the ultra precision cycloid wheel forming grinding machine was affected.To explore the transient thermal stress and thermal deformation of ultra precision cycloid wheel forming grinding machine artificial granite bed in working,the geometric model of artificial granite grinding machine bed was built by collaborative simulation method based on 3D and finite element software.The transient temperature field of the grinder bed was obtained by exerting force on the guide rail surfaces to simulate the grinder bed real working environment.And then,external restraint loads were exerted to obain thermal deformation cloud picture,equivalent stress and strain curve.According to the thermal deformation and temperature distribution of the ultra precision cycloid wheel forming grinding machine artificial granite bed,several measures for improving the thermal deformation of the machine tool bed have been put forward.%热变形是影响超精密摆线轮成型磨床综合精度的重要因素之一,为了探究超精密摆线轮成型磨床人造花岗岩床身在工作中的瞬态热应力、热变形情况,利用三维设计软件和有限元软件协同仿真的方法,建立超精密摆线轮成型磨床人造花岗岩床身模型,通过对床身施加边界条件及相关载荷来获得床身的瞬态温度场,以获取床身的瞬态热变形、热应力.最后,根据超精密摆线轮成型磨床床身热变形及温度场分布状况,提出了改善床身热变形的若干措施.