Study On Electromechanical Collaborative Simulation For Feed System Of CNC Cutting Machine

The CNC cutting machine is mainly used for cutting soft materials such as clothing and leather,and its performance directly affects the cutting quality and production efficiency.Its cutting performance directly determines the quality of the product and the production efficiency of the enterprise.Limited by the performance disadvantages of domestic cutting machines,most small and medium enterprises import high-performance cutting machines from abroad with high prices in order to adapt to market demand,which increases production costs and restricts the development of enterprises.In view of the efficiency of the cutting machine,the "over-window cutting" method is proposed,which is of great significance for improving the cutting efficiency and cutting quality of the cutting machine.The traditional cutting method only has two sub-motions of X and Y to synthesize the cutting trajectory.Based on traditional cutting methods,the "over-window cutting" increases the movement of the cutting table,the cutting trajectory is a combination of the three movements of X,Y and the table,which greatly improves the cutting efficiency of the cutting machine.However,the control method of cutting becomes more complicated,and the control accuracy and stability of the three movements of X,Y and the table are more demanding.In order to meet the requirements of servo feed accuracy and stability in the "over-window cutting" mode,this paper designs a servo feed system driven by ball screw and chain,and verifies feasibility of the transmission scheme by electromechanical collaborative simulation experiments.The main work and research results of this paper are as follows:(1)This chapter explains the principle of "over-window cutting",analyzes the motion relationship of "over-window" and derives its velocity formula.By analyzing the transmission requirements of "over-window cutting",designed a scheme that X-direction is driven by the double screw,Y-direction is driven by the single screw,and the worktable is driven by the chain.Based on the calculation formula of the original cutting bed adsorption force,derivingthe calculation formula of adsorption force under the condition of “over-window”.Based on the calculation formula,the parameters of the transmission member based on over-window are calculated.Finally,the mechanical system of the feed system is established by Solidworks model.(2)The rigid body dynamics model of the feed system was established by ADAMS.Considering that the feed system is prone to vibration when rotating at high speed,the modal analysis of the screw feed system was performed by ANSYS/Workbench,and its natural frequency and critical speed were calculated.The ball screw is regarded as a flexible member,which is flexibly processed by ANSYS,and the rigid-flexible coupled dynamic model of the feed system is established by replacing the rigid body with a flexible body.(3)The mathematical model of permanent magnet synchronous motor is established by using coordinate transformation,and a three-closed loop control loop based on PID controller is designed.According to the principle of energy conservation and power balance,the relevant parameters of the feed system are converted.The PID design method is used to adjust the PID parameters,and good response performance is obtained.(4)The ADAMS/Control module is used to connect the rigid-flexible coupling dynamics model and control model of the feed system established above,and the interactive co-simulation experiment with MATLAB as the main program and ADAMS software is realized.The S-type speed curve is used as the input of the control system.The output mechanical response curve shows that the two screws in the X direction have better synchronization and dynamic response.The dynamic response curve of the Y-direction screw and the chain drive is better.The feed accuracy is better.And stability meets the requirements of "over window cutting".The circular trajectory is taken as the target curve,and the fitting result shows that the dynamic tracking performance of the feed system is better,and the servo feed system has higher feed accuracy.In this paper,the mechanical simulation of the designed feed system is carried out by virtual prototyping technology,and obtaining a fine simulation results.The electromechanical co-simulation technology based on virtual prototype is a good way to simulate the actual working conditions and greatly shorten the development cycle of mechanical products.It reduces the research and development cost of mechanical products and provides a feasible analysis method for the research of complex mechanical systems.