Design And Analysis Of Three-coordinate Multi-station Servo Feeding System

Large-scale multi-station press is the main equipment of automobile panel stamping production line.The three-coordinate servo feeding system used with it is an important guarantee for the realization of high-speed automatic stamping production.The performance of the feed system has a direct impact on the efficiency and reliability of the whole production line.In this paper,three-coordinate multi-station servo feeding system is used as the research object,and the key problems such as configuration design,motion and dynamic analysis,trajectory planning and optimization of the system are studied.Firstly,the working principle of the feeding system is analyzed,and the design parameters of the feeding system are given according to the process requirements of the stamping production line.By comparing and analyzing the transmission modes of the current feeding system,it is determined that the feeding direction is gear-rack transmission,and the offset crank slider mechanism is used in the clamping and lifting direction.The crank and connecting rod transmission mechanism is designed based on the principle of maximum minimum transmission angle in the working stroke of the mechanism.The selection of three coordinate direction servo motors is preliminarily calculated and the three dimensional model of the feeding system is established.Secondly,the position inverse solution of the feed system bar structure is carried out by the method of coordinate transformation,the velocity Yakubi matrix of the feeding system is solved,and the dynamic model of the feeding system is established by using the Lagrange equation method.According to the movement period of the offset crank press,the cycle planning of the feeding motion is carried out.The B-spline trajectory curve of the terminal gripper of the feed system is obtained by using the B-spline function method,and the trajectory curve is optimized with the shortest feeding time as the optimization objective,and the working frequency is increased by 20%.Finally,the virtual prototype model of the feed system is established by using the dynamic analysis software,and the kinematics simulation of the feeding system is carried out by using the virtual prototype technology.The results show that the feeding stroke and speed meet the design requirements.It is analyzed that the clearance of the motion pair has great influence on the feeding speed and has little effect on the position.The dynamic interference simulation results show that the slider motion and feed motion of press will not interfere.