Numerical control cutting bed movement control method based on offset amount NURBS (Non Uniform Rational B Spline) curve

Abstract

A numerical control cutting bed movement control method based on offset amount NURBS (Non Uniform Rational B Spline) curve is as follows: a data read-in module reads in leather processing path control point information and offset amount of curve rail required to be adjusted, an interpolation module calculates node vector according to read-in information points; a distance amount calculated by taking particular values for a primary function and a weight factor is calculated according to the node vector; deformation reconstruction of NURBS rational fraction is performed according to the offset amount and the distance amount, and the weight factor is replaced by the offset amount; according to the reconstructed NURBS rational fraction, the whole path is divided into sections; then the running time of each section is calculated, the variable quantity of U value can be obtained; an interpolation point can be obtained according to the variable quantity of the U value, and the interpolation control module outputs the interpolation point to a mechanical motion module to control a cutter to machine a workpiece. Through the way, a spline method is used for interpolation, the weight factor is replaced by the offset amount, and the disadvantages that a current leather cutting bed is incapable of high precision machining of a free - type path, the processed path cannot be simply adjusted, and NURBS method interpolation parameters are difficult to understand can be overcome.

Description

technical field [0001] The invention relates to the field of numerical control systems, in particular to numerical control cutting machines and other fields involving path planning, and is a motion control method for numerical control cutting machines based on offset NURBS curves. Background technique [0002] Since the late 1960s, some industrially developed countries such as the United States, Germany, Japan, and France have successively used numerical control technology to automate the leather product processing industry, garment processing, and textile industries to improve the automation level of these labor-intensive industries. Reduce labor costs. Domestic leather cutting technology research started late, mainly using linear interpolation and circular interpolation for path trajectory fitting. With the development of leather cutting technology, the trajectory is becoming more and more complex, and the precision requirements are getting higher and higher. It is diffic...

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Problems solved by technology

[0006] The technical problem mainly solved by the present invention is to overcome the high-precision fitting of some leather processing trajectories by the leather cutting machine; the processing trajectories cannot be adjusted simply and accurately without changing the control points; the current NURBS curve theory is not intuitive and linear enough Insufficient in the control of the processing curve track, etc., the present invention provides a kind of CNC cutting machine motion control method based on the offset NURBS curve that can linearly adjust the processing track of the leather cutting machine without changing the control points

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