Research On Communication And Interpolation Motion Control Of Five Axis Open CNC System Based On SERCOS

Based on “China manufacturing 2025”,intelligent manufacturing is the main direction of China manufacturing.As the key technology of intelligent manufacturing,numerical control technology will be developed rapidly.As the core technology of CNC machine tools,motion control is bound to become a research hotspot.The communication technology of the open CNC system and the interpolation motion control technology are studied in this dissertation.First of all,by analyzing the characteristics of various motion control interfaces,the SERCOS ? interface is selected as the motion control interface,and the hardware and software platform of CNC system is built by industrial control computer and general Windows operation system with RTX8.1 real-time expansion system.The five phase communication software of controller and driver is developed based on SERCOS ? interface.Then an open CNC architecture for real-time communication and real-time interpolation based on SERCOS ? interface is proposed.The open CNC system has sufficient real-time communication capability which provides data support for the interpolation algorithm analysis and acceleration/deceleration algorithm analysis,and improves the openness of the whole CNC system.Secondly,aiming at the problem of the motion error caused by the non-linkage of the coordinate increment of each kinematic axis in the interpolation process.This paper puts forward to a dynamic coordinated real-time interpolation algorithm based on SERCOS? interface communication technology.The algorithm can effectively guarantee the coordinate increment of each axis linkage,so as to ensure the accuracy of processing straight line.And the algorithm has high real-time performance and high efficiency.Based on the principle of FSM,this paper divides the communication,interpolation and acceleration and deceleration into three modules,and puts forward a hierarchical FSM behavior model.It achieves effective coordination between interpolation control and acceleration and deceleration control through the total management state machine and all levels of state machine.Once again,aiming at the problem of trapezoidal acceleration/deceleration in CNC system leads to low location accuracy and long positioning time,which affect the quality of surface and machining accuracy.Based on SERCOS? interface communication technology and hierarchical finite state machine behavior model,a piecewise variable speed value processing acceleration/deceleration control method is proposed.The algorithm has high real-time performance and high accuracy,and ensures the smoothness and accuracy of machine running.Finaly,by building a single axis servo control platform,the reliability of the five phase communication software has been verified.The accuracy and reliability of the interpolation algorithm is verified through Matlab fitting the data points calculated by the interpolation algorithm proposed in this paper.Moreover,the data points calculated by the interpolation algorithm with acceleration and deceleration control algorithm are simulated and fitted to verify the reliability and stability of the acceleration and deceleration algorithm in this paper.