Non uniform rational B spline (NURBS) interpolation based speed smooth control method

Abstract

The invention discloses a non uniform rational B spline (NURBS) interpolation based speed smooth control method which comprises obtaining contour parameters of to-be-processed parts and cutting tool processing path according to the obtained contour parameters; utilizing five section S curve method and the space vector transfer method to conduct acceleration and deceleration planning and smooth transfer processing to the processing section of the cutting tool in the processing path, and then conducting interpolation processing to the processing section, so that processing path control signal of the cutting tool can be generated; processing the to-be-processed parts according to the generated processing path control signal of the cutting tool. The NURBS interpolation based speed smooth control method can not only guarantee the instantaneity and processing efficiency of numerical control machining, but also improve transfer speed and processing efficiency between tracks, and prevent mechanical shock on the corner of track section, so that machining precision is improved. Furthermore, only three stages of time of acceleration speed, uniform velocity and deceleration need to be confirmed, and whole section of acceleration and deceleration control curve can be constructed. The NURBS interpolation based speed smooth control method has the advantages of being simple in algorithm, easy to achieve and capable of being widely applied to the field of numerical control machining.

Description

technical field [0001] The invention relates to the technical field of numerical control machining, in particular to a speed smoothing control method based on NURBS curve interpolation. Background technique [0002] The high-speed and high-precision machining of CNC machine tools is an important means to improve the quality and efficiency of machining. At present, when the CNC (numerical control machine tool) system processes parts with complex profiles, it generally first discretizes the machining path of the tool into a large number of straight line segments according to the machining accuracy requirements, and then performs linear interpolation processing on the parts. However, this processing method is difficult to make the processing speed reach the feed rate required by programming, and may even cause severe fluctuations in processing speed; at the same time, this processing method is also difficult to improve the processing accuracy, thus affecting the smoothness of t...

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Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a speed smoothing control method based on NURBS curve interpolation to meet the requirements of CNC machining on machining speed, machining accuracy and real-time performance, thereby overcoming the seven-segment S-curve acceleration and deceleration algorithm Complicated and insufficient current speed smoothing control methods

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