Numerical control system, device with storage function and nurbs curve interpolation method

Abstract

The invention discloses a numerical control system, a device with a storage function, and a NURBS curve interpolation method. The NURBS curve interpolation method includes: establishing a forward-looking buffer, storing buffer node data in the forward-looking buffer; obtaining the current interpolation data according to the buffer node data. The interpolation speed of the interpolation cycle, and determine the interpolation point, and perform NURBS curve interpolation through the interpolation point; judge whether the NURBS curve interpolation is completed, and if the NURBS curve interpolation is not completed, enter the next interpolation cycle. The present invention establishes the forward-looking buffer, saves the curvature-limited speed and the backward-limited speed with equal arc-length intervals through the forward-looking buffer, and maintains the forward-looking buffer according to the forward-looking buffer update method, which can not only reduce the acquisition amount of the algorithm, thereby reducing The time overhead of each interpolation cycle also ensures the real-time performance of the interpolation.

Description

technical field [0001] The invention relates to the technical field of numerical control, in particular to a numerical control system, a device with storage function and a NURBS curve interpolation method. Background technique [0002] At present, most CAD systems on the market support the modeling function of free curves and surfaces. For the free curves and surfaces in the model, in the process of NC machining, the method of approaching the curve with micro-segment straight lines is generally used, which results in huge processing files. , and the quality of surface processing is frequently affected by changes in acceleration and deceleration. The free curve interpolation can make the processing speed of the whole curve more uniform, so it can improve the surface processing quality and processing speed, and is suitable for high-speed processing. Non-Uniform Rational B-Splines (NURBS for short) provides a unified representation method for existing curves. NURBS interpolati...

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Problems solved by technology

[0004] Since the existing real-time speed planning NURBS interpolation technology needs to use the interpolation period as the step size in each interpolation period, by obtaining the speed limit of the current interpolation period from the curvature and length of the NURBS curve of the non-interpolated part, not only The large amount affects the running speed of the algorithm, and it takes up a lot of space, which makes it difficult to meet the real-time requirements of the CNC system when the interpolation cycle is small

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