Research For The Electro-mechanical Coupling Of Series Mechanism Of Virtual Axis Polishing Machine

With the development of the integration of the world economy and IT industry, it has taken place great revolution in the environment of modern manufacturing enterprise, the Virtual Axis Machine Tools is considered the 21th Centuary's machine tool. The study of electromechanical coupling can establish a foundation for widely application of Virtual Axis Machine Tools. The development and application of Virtual Prototyping Technology provide a technical means for the exploitation and research of NC Machine Tool. How to apply virtual and simulation technology to solve the key problem of machine tool is key in the field of machine tool. The virtual axis polishing machine tool that is exploited in Jilin university and used to polish free-form surface is applied as a study object. Use the software of ANSYS, ADAMS and MATLAB as tools to analyze the problems about virtual axis polishing machine. According to the characteristics of serial mechanism, put forward static-dynamic simulation control theory based on Virtual Prototyping Technology, study the application of virtual prototype technology in virtual axis machine tool, propose a kind of parallel controlling strategy based on CMAC and PID, and study the characteristics of mechanical transmission and electromechanical coupling. By introducing virtual technology to the study and analysis of virtual axis machine tool, provide a new technology platform for the widely using of this new type machine tool.1.On the base of analysis of machine tool structure, draw the model of series mechanism of virtual axis polishing machine tool by using CATIA, which contains dynamic platform and tool. Simply the model in order to analyze conveniently, establish and assemble the solid models of each part of mechanism. The series mechanism is as follows Fig1. Fig1.series mechanism of virtual axis polishing machine2.Constraint each component of virtual axis polishing machine tool by using SimDesigner in CATIA V5. Measures the motion path of polishing tool in the polishing machine tool and analysis the motion characteristics of series mechanism of virtual axis polishing machine tool under working of the servo-motor. The analysis results of ADAMS is as follows Fig2. Simulation analysis show that the mechanism has the properties of well acceleration performance , shorter time of adjustment, accurate and fast implementation. Fig2.The force,torque,displacement of cutterhead in working of servo-motor3.The precision of series mechanism will directly effect the precision of whole machine tool. This thesis conduct a static-dynamic analysis of series mechanism. For convenient analysis, deal with models by means of deleting some modified characteristics, such as chamfer, lug boss and keyhole that will not effect the mechanism significantly. Lead the models to Software ANSYS and come on its previous 12 order frequency and vibration mode . Fig3 is First Order Modal Logic, it is clearly that the around area of polishing tool has big deformations under the effect of servo-motor. Fig3.The first order mode shape of series mechanism of virtual axis polishing machine4.Motor torque is the input of the modal and exercise volume of polishing tool is output. Draw out the kinetic curve of polishing tool based on the simulation by use of software ADAMS and MATLAB. The polishing tool can work stably in short time and the flutter of polishing tool can satisfy the processing precision's requirement by way of analyzing the motion of series mechanism. Fig4.The cutterhead's flutter force under effect of two driving force based on MATLAB5.Put forward a parallel control method of CMAC and PID aiming at the nonlinearity and various uncertainty existing in high precision servo systems. Study the electromechanical coupling prosperities of high-precision mechanical drive in servo systems based CMAC and PID, establish the coupling modal of servo systems and simulate the structure by use of MATLAB/Simulink. The results show that the method overcome some disadvantages that common controller can't avoid, improve the control effect, fasten control corresponding velocity, satisfy the tracking accuracy's requirements and fully embody cerebellum model's characteristics, such as minor error, strong robustness. The research has considerable reference value in engineering in improving the high precision dynamic tracking of servo systems.