基于有限元法的数控龙门铣床滑枕部件的热特性研究

摘要

滑枕是数控龙门铣床的关键功能零部件，现有滑枕部件的热变形过大影响了机床的加工精度。采用热弹性力学理论和有限元方法，对滑枕部件进行热特性分析，建立滑枕部件的热力耦合变形的有限元方程。针对实际加工中存在的问题，建立了滑枕有限元模型，确定了滑枕的内部热源、传热方式和边界条件；通过ANSYS Workbench软件对滑枕进行热态性能分析和热力耦合分析，并计算得到稳态时滑枕的温度场分布和热变形大小，为数控龙门铣床的滑枕改进设计提供依据。%Ram is a functional part of great importance to a CNC planer type milling machine.The overlarge thermal deformation of the ram will reduce the working accuracy of the machine.By applying theory of thermo elasticity and finite element method (FEM), the thermal characteristics analysis of the ram was completed,and the finite element equation (FEE)of deformation caused by thermal-mechanical coupled was established.Aimed at the problems existed in actual machining,the finite element model (FEM)of the ram was established,the heat source and the way of heat transfer and boundary conditions were ensured,and the thermal characteristics and thermal-mechanical coupled analysis of ram were finished by ANSYS Workbench software.The temperature field distribution and ther-mal deformation were obtained by computation,which provide theoretical support for improvement during the designing of the ram of CNC machine.