Horizontal Mechining Centre Feed System Dynamic Characteristics Analysis And Otimization

Horizontal machining centre gradually evolves to high-efficiency, high-load and high-precision direction. Movement and dynamic characteristics of feeding transmission part directly impact on the efficiency and machining accuracy of the machine tool. Because of dynamic characteristics of mechanical transmission parts are not considered well in the design stage, feed system performance can not meet the design objectives and requirements. The analysis of feeding system kinematics and dynamics can provide the gist for design. In this paper, Y direction of horizontal machining center feed system is taken as the research objective. Through the calculation and choice of ball screw and motor, preliminary design is formulated. On the basis of this, analysis of the kinematics and dynamics analysis can be developed. The kinematics model is established and the movement scheme is set. Then its movement characteristics influencing factors are analyzed.The dynamic characteristics of the Y axis feed system is the key factor to affect the machining accuracy and energy consumption of machine tool. On the basis of feed system physical structure model, feed system mechanics model is set up. Based on bond graph theory, the Y axis feed system bond graph model is established. Using of the analytic solution of state equation of bond graph and combined with finite element analysis method of ANSYS WORKBENCH, natural frequency of the system is analyzed and rationality of the dynamic model is validated. The design parameters of screw diameter, bench quality, bench location influence on the system such as natural frequency and input torque is analyzed. The further research of the system dynamic response is developed and the influence rule of design parameters and operation parameters is analyzed. The research for the further implementation of high-precision, low-power Y-axis feed system design is of great significance.Based on the comprehensive analysis of design parameters and operation parameters, combining with multi-objective optimization, design with good movement characteristics and dynamic is concluded.