Thermal Active Control Method Of Motorized Spindle Based On Power Matching Of Heat Generation And Dissipation

Motorized Spindle is a new technology in the field of CNC machine tools that integrates the spindle of the machine tool and the spindle motor.The motorized,along with linear motor technology and high-speed tool technology,pushes high-speed machining into a new era.As the core component of CNC machine tools,the suppression of the thermal error of the motorized is of great significance to reduce the thermal error of the machine tool and improve the machining accuracy.In this paper,the electrical spindle of a precision horizontal machining center is taken as the research object,and the thermal characteristics are studied from the aspects of heat generation modeling,transient thermal fluid-structure interaction simulation analysis,thermal active control,and load simulation experiments.In this paper,the heat generation mechanism of the motorized unit is analyzed and a heat generation model is established.According to the established model,transient thermal fluid-structure interaction simulation is performed on the motorized unit,and a method for analyzing the thermal characteristics of the motorized based on the generated heat dissipation power is proposed.The relationship between the heat generation power and the heat absorption power of the structure at each time point from the initial moment to the thermal equilibrium of the motorized was analyzed.This article designed a set of experimental device that can apply torque and radial force load to the electro-spindle to simulate the actual load state during machining of the electro-spindle.The temperature field distribution and Distribution of deformation field.In this paper,the thermal active control method of the motorized with multiple temperature control loops is experimentally studied.The active thermal control experiment of the motorized is performed under four operating conditions.The experiments show that changing the coolant inlet temperature has a positive effect on improving the motorized temperature field and suppressing thermal errors.Role.The experimental results are compared with the simulation results to verify the accuracy of the electro-spindle heat dissipation modeling and finite element modeling.The above research results provide a theoretical basis for the study of the thermal characteristics of the motorized system and are of great significance for improving the machining accuracy of CNC machine tools.