Adaptive Robust Control And Implementation Of High Frequency Rotating Servo Tool Holder System

In recent years,the sales volume of automobiles has increased continuously,made the demand for pistons in internal combustion engines increased.At present,the main processing method of the special-shaped external cylindrical piston is the soft modulating method(convert the processing map of the piston into a database,and then use CNC to cut the piston),and the key structure of the circular machine tool is the high-frequency linear servo tool holder system.and its capability determines the final processing level of the piston.The second derivative of the curve of the outer circumference of the piston is not continuous,At the cutting of the machining piston appears shock and other issues.Therefore adaptive robust controller of the tool holder system is designed for the problems.The designed controller is applied to the motion control of the tool holder system.The machining experiment verifies the feasibility of the controller,and the accuracy of the tested piston meets the requirements.The main contents of this thesis are as follows:Firstly.based on the design of the high-frequency linear servo tool holder system,the main performance indexes are proposed.When the tool holder system processes an "ellipse + eccentric" connected circle surface piston.there are problems that the impact is oscillated at the second derivative of the curve is not continuous and the part of the machining path is outside the tolerance zone;the performance of the linear motor are analyzed for the problem;the energy flow principle of the bond diagram method is used.The simulation model of the bond diagram of the linear servo tool holder was built.and the stabilitxy of the tool holder system was analyzed.Secondly,in order to reduce the shock at the second derivative of the curve is not continuous,improving the robustness of the tool holder system,and enhancing the tracking ability of the tool holder system.an adaptive robust controller is designed for the linear servo tool holder system.The superiority of robust control and the application of adaptive robust controllers are applied to the motion control of linear servo tool systems.Then,in order to verify the accuracy of the linear servo system and the tracking performance of the adaptive robust control,the latest national standard is used to measure the positioning accuracy and repeat positioning accuracy of the linear servo tool post system.The measurement results show that the accuracy of the tool post meets the design requirement.The results show that adaptive robust control has a good tracking performance.Finally,the hardware and software structure of the experimental platform and its communication method are introduced.The cutting process of the "ellipse + eccentric circle" connected profile piston is carried out.The measurement results meet the requirements of the production process,and the processing capability of the linear servo tool holder svstem is verified.