Research On Dynamic Characters Of Screw Feed System Of Machining Center Based On Co-simulation

With the development of advanced manufacturing technology, NC machining technology has been greatly improved, and machining center has been developing towards high speed, high precision and high efficiency as well. Feed drive system is an important part of machining center and its dynamic characters directly affect the manufacturing quality and efficiency of the system, therefore requirements for dynamic performance of feed system of machining center are getting higher and higher. In this paper, the screw feed system of HMC630 horizontal machining center is studied, and the dynamic characters of feed system are further studied by using multi-body dynamics modeling and electromechanical co-simulation technology.Firstly, according to the traditional machining center feed drive, multi rigid body model machining center is built using the theory of multi body system dynamics. Ball screw was made flexible using finite element analysis software, then rigid-flexible coupling model of machining center feed drive system was built. Dynamic simulation of multi rigid body model and rigid-flexible coupling model was conducted respectively, then kinetic parameters obtained through simulation are compared and studied, results show that rigid-flexible coupling model can reflect the movement of feed drive system better than rigid model.Then sevro control system model was built, and its control parameters were adjusted, so that quicker response and higher control accuracy of system were obtained. Co-simulation platform was built through combination of feed and control system.In order to conduct the study of dynamic characters of feed system of machining center through the change of the speed control strategy and obtain better speed control stratergy and provide reference for the selection of best feed method, acceleration and deceleration instruct of linear and S type were inputed to drive operating platform within co-simulation model. Manufacturing of cam was simulated within co-simulation model, then plane and space cam machining trajectory were obtained accordingly, and trajectory obtained were compared with theoretical trajectory,therefore improving measures were proposed. Results show that the simulation platform can help analyze and evaluate the dynamic performance of the feed drive system of machining center, which can be used to adjust the parameters of servo control system, and to analyse the manufaturing trajectory. Dynamic parameters ofmanufacturing process can be obtained within post-processing model of ADAMS,which may provide reference for studying and improving machining center.