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 comprises: establishing a look-ahead buffer and storing buffer node data in the look-ahead buffer; and acquiring current insertion according to buffer node data and confirming the interpolation speed of a current interpolation cycle and performing NURBS curve interpolation through the interpolation point; determining whether an NURBS curve is finished interpolation or not, entering a next interpolation cycle if not. The invention notonly reduces the acquisition amount of an algorithm, but also reduces the acquisition amount of the algorithm by establishing a look-ahead buffer, thereby saving the curvature limit speed and the backward limit speed of the arc length interval by the forward buffer, and maintaining the look-ahead buffer according to the look-ahead buffer update method. The time overhead of each interpolation cyclealso ensures the real-time nature 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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