某型号立式加工中心主轴冷却器系统热流固耦合热态特性分析

Thermal Characteristic Analysis of Vertical Machining Center Spindle Cooler System Based on Thermal Fluid-Structural Interaction

主轴热变形是影响数控机床加工精度的关键因素,识别主轴系统的热态特性,进而控制主轴热变形是提高机床整机精度的重要任务。文中以某企业实际生产的立式加工中心主轴系统为研究对象,建立其主轴冷却器系统的三维模型;利用ANSYS Module Designer生成流域的三维模型,再利用Mechanical对冷却器和流域进行单元划分,形成流场有限元模型,通过流场分析获得流体的温度分布、速度变化、压力变化及冷却器的温度分布;通过稳态热分析,求解得到分析模型的温度分布;将流场分析得到的流体边界面的压力载荷和稳态热分析得到的温度载荷数据传递给静力结构分析模型,求解得到其应力分布及热变形。分析结果可为主轴冷却器系统结构的进一步优化设计和控制主轴热变形提供技术支持。

Spindle thermal deformation is a key factor affecting the machining accuracy of CNC machine tools.Identifying the thermal characteristics of the spindle system and controlling the thermal deformation of the spindle is an important task to improve the accuracy of the machine.The spindle system of vertical machining center actually produced by a company is taken as the research object,and the three-dimensional model of the spindle cooler system is established.The 3D model of the watershed is generated by ANSYS Module Designer,and the unit partition is completed to the cooler and the watershed by using Mechanical,and then the finite element model of the flow field is formed.The temperature distribution,velocity change,pressure change of the fluid and the temperature distribution of the cooler are obtained by flow field analysis.Temperature distribution of the analytical model is obtained by steady-state thermal analysis.The pressure load on the fluid boundary surface obtained by the flow field analysis and the temperature load obtained from the steady-state thermal analysis are transmitted to the static structure analysis model to obtain the stress distribution and thermal deformation.The analysis results provide technical support for further structural optimization design of the spindle cooler system and control of spindle thermal deformation.