Numerical control interpolation system for real-time generation of curvature-continuous path

Abstract

The invention discloses a numerical control interpolation system for real-time generation of a curvature-continuous path in the technical field of mechanical numerical control processing. The system comprises a man-machine interaction interface module, a decoding module, an interpolation module and a position control module, wherein the man-machine interaction interface module selects a file to be processed and transfers the name of the file to the decoding module; the decoding module extracts the position information of each axis of a machine bed, transmits the position information to the interpolation module and carries out transition on connection points of every two adjacent line segments by a curvature-continuous Bezier curve to generate a curvature-continuous tool path; a maximum deviation value between the generated curvature-continuous path and an original path is smaller than a set error value; speed planning and Bezier interpolation are then carried out; and an interpolation point is output to the position control module at last. The system is high in calculation efficiency of the whole process and simple in implementation of programming and can be applied to a high-speed and high-accuracy numerical control machine bed.

Description

technical field [0001] The invention relates to a numerical control interpolation system in the technical field of mechanical numerical control machining, in particular to a numerical control interpolation system for generating continuous curvature paths in real time. Background technique [0002] In NC machining, usually the post-processor of CAM (Computer Aided Manufacturing) software decomposes the complex path into a series of tiny path segments according to the requirements of machining accuracy, and then the interpolator in the NC system Interpolation operation is performed on the tiny path segments. For the processing trajectory composed of a large number of small path segments, the traditional CNC system uses each path segment as the planning object when performing speed planning, which will inevitably result in many starts and stops and slow speed, thereby reducing the surface quality and processing efficiency. Although look-ahead technology reduces the number of s...

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Problems solved by technology

[0004] Through document retrieval to prior art, it is found that many methods have adopted Bezier (Hong-Tzong Yau. Fast Bezier interpolator with real-time lookahead function for high-accuracy machining. International Journal of Machine Tools and Manufacturing. (2007) 47: 1518 -1529), NURBS (Jun-Bin Wang. Real-time NURBS interpolator: application to short linear segments. The International Journal of Advanced Manufacturing Technology. (2009) 41: 1169-1185) and other parametric curves to fit linear path segments , the first method is not universal, it is only suitable for the smooth part of the tool path, and only realizes tangential continuity, the second method needs to check the error after fitting, the point and curvature on the parameter curve are often related to the parameter The complex expression makes the fitting error difficult to estimate, and it is difficult to apply to the real-time computing environment

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