Measurement And Analysis On Dynamic Performance Of Domestic Made PT50 Horizontal Machining Center Spindle As Well As Its Feed System

The machining performance of the horizontal machining center depends on the dynamic performance of the spindle component and its feed system.Therefore,it is of great significance to measure and analyze the dynamic performance of the spindle component and its feed system in the horizontal machining center for improvement.The main research efforts and achievements were focused in following aspects.1.According to the PT50 horizontal machining center domestically designed,the structural characteristics of two kinds of horizontal machining center spindle components and their feed systems were analyzed.The main factors influencing the dynamic performance of spindle component and its feed system were investigated.2.By measuring the vibration acceleration of the spindle component and its feed system when the spindle ran at different rotation speeds,the dynamic performance of the spindle component and its feed system in the working frequency range of the machining center were analyzed,and the range of the natural frequency of the structure was preliminarily determined.3.An experimental scheme was designed to measure the natural frequencies of the spindle component and its feed system.By analyzing the amplitude and phase diagrams of the frequency response functions,the natural frequencies of the spindle system were determined.Another experimental scheme was developed to obtain the modal shapes of the front end of the motorized spindle.4.A measurement method was designed to determine the contact state of the joint surface of the guide rail by measuring the contact resistance.By comparing the contact resistance and the natural frequency of the joint surface of the guide rail,the correlation between the contact resistance and the contact stiffness was verified.The dynamic performances of the joint surfaces of different processing technologies were compared,which provided a reference for the selection of processing technology.5.The finite element model of the spindle component and its feed system was established to simulate the modal shapes on each measured natural frequency by NX.The structure of the pipeline support was found to be with the worst dynamic performance.The structure was optimized to improve the dynamic behavior.