Real-time smooth transition interpolation method of small high-speed and high-accuracy numerical control machining line segment

Abstract

The invention discloses a real-time smooth transition interpolation method of a small high-speed and high-accuracy numerical control machining line segment. The real-time smooth transition interpolation method is characterized by comprising an HMI (Human Machine Interface) module, a program interpretation module, a cutter compensation module, a rough interpolation module and an accurate interpolation module, wherein the HMI module is used for transmitting a numerical control machining program to the program interpretation module, program interpretation can be carried out by the program interpretation module, information of a machining path can be extracted, cutter compensation can be carried out by the cutter compensation module, information of a cutter path can be obtained, the information can be transmitted to the rough interpolation module, smooth transition connection can be carried out on adjacent line segments nearby an adapting point by adopting a cubic B-spline curve passing a control point, a smooth cutter path in continuous curvature can be generated, the smooth cutter path can be subjected to speed planning and interpolation operation, interpolation data can be sent to the accurate interpolation module, and processed data which is subjected to accurate interpolation operation can be sent to a driver so as to drive a numerical control machine tool to move. According to the real-time smooth transition interpolation method disclosed by the invention, the running of the machine tool is more smooth and stable, the computation efficiency is high, the algorithm is simple, and the real-time smooth transition interpolation method is suitable for a high-speed and high-accuracy machining numerical control machine tool.

Description

technical field [0001] The invention relates to a numerical control system in the technical field of numerical control machining, in particular to a real-time smooth transition interpolation method for small line segments in high-speed and high-precision numerical control machining. Background technique [0002] When CNC machine tools process complex parts, CNC machining programs are generally generated by automatic programming methods, and automatic programming is completed by CAM (Computer Aided Manufacturing, computer-aided manufacturing) software. Usually, the CNC program code contains a large number of continuous short line segments, and the length of the line segments is generally They are very short, and some line segments are even millimeter or sub-millimeter in length. The interpolator of the CNC system performs interpolation operations on these short line segments to obtain the tool movement trajectory. The traditional numerical control system directly plans the sp...

AI Technical Summary

Problems solved by technology

Usually CAM and CNC are two independent systems, and the CNC system loses the original model data of the CAM system. Therefore, this curve fitting method cannot really restore the original contour model, and there is still a certain relationship with the original contour model. The error may sometimes produce a large error, and this method of full curve fitting is very computationally intensive, and it is difficult to meet the real-time requirements of the CNC system

Therefore, this method is difficult to apply to high-speed CNC machining occasions

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