Research On Certain Questions Of Error Compensation For Cnc Machine Tool

CNC machine tool error compensation technology is an economic and effective method and means to improve the accuracy of it. This paper researched on the error synthesis model, established a new method for geometric error identification of multi-DOF meter and a new method for thermal errors geometric based on fuzzy neural network. Finally give the simulation results of machine tool thermal error compensation, and gives the new error compensation of the CNC laser cutting machine.Details as followers:(1) Researched the kinematics error analysis of multi-body system based on the basic theory of the multi-body system error analysis kinematics. Take three-axis machine tool for example, establishment the coordinate system of various components of machine tool through analysised machine topology. Established an space positioning errors integrated model of three-axis CNC machine tool according to the "tool - Bed" campaign chain between cutting tools, spindle and the relationship between the kinematics chains of the machine bed and the workpiece.The model provide a theoretical basis for machine tool error identification and compensation.(2) For machine tool thermal errors for nonlinear time-varying characteristics, Analysised the deficiency of nine-line method based on the geometric error parameter identification method for machine tool error parameter identification problem, given the thinking of measured the geometric error used multi-DOF geometric error detector. Proposed a method for parameter of thermal errors based on fuzzy neural network modeling. Provide a basis for the correct implementation of error compensation of machine tools.(3) For error compensation of machine tool. studied the implementation process to determine the temperature-sensitive point location, the temperature detection system design, sensor fault detection and recovery and other issues of machine tool thermal error compensation, through simulation examples to prove that the theory based on fuzzy neural network thermal error compensation method is feasible; Creative presented by secondary development of AUTOCAD, modify engineering drawings, dimensions to carry out error compensation method on the CNC laser cutting machine according to its process, the simulation results prove it is feasible.