Speed-priority spline real-time interpolation method facing high-speed processing

Abstract

The invention relates to a speed-priority spline real-time interpolation method facing the high-speed processing, which comprises the following steps of: obtaining a speed limit curve, i.e. obtaining the speed limit curve according to a processing error and constraint conditions of the maximum acceleration of each movement shaft in an interpreter of a numerical control system; dividing a processing region, i.e. according to information of a critical speed that processed materials enter the high-speed processing region, dividing the speed processing region and modifying an initial speed curve to obtain a modified speed curve; carrying out backward chaining on the speed curve, i.e. removing speed discontinuous points on the modified speed curve, so that the integral speed curve is continuous; and carrying out real-time interpolation, i.e. according to the speed curve subjected to backward chaining, carrying out interpolation algorithm to complete the speed-priority spline real-time interpolation. The invention provides a time approximation optimal spline curve interpolation method. In the speed-priority spline real-time interpolation method, on the premise of ensuring the stable operation of a machine tool, the maximum acceleration capacity of a single shaft is sufficiently utilized, so that the requirement of the numerical control system on the high-speed processing is met.

Description

technical field [0001] The invention relates to a speed processing technology of a numerical control system, in particular to a speed-priority spline curve real-time interpolation method for high-speed machining. Background technique [0002] Salomon, the father of high-speed machining, found in cutting experiments that when the cutting speed reaches a certain value, the cutting temperature no longer increases with the increase of the cutting speed, but shows a downward trend, and then resumes with the increase of the cutting speed. And keep increasing. According to the above findings, Salomon proposed the theory of high-speed machining. [0003] Compared with traditional machining, high-speed machining has obvious advantages. First, because high-speed machining reduces cutting force and cutting temperature, it helps to improve the quality of the machined surface. Secondly, high-speed machining can reduce tool wear and replace some traditional machining processes, which ca...

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Problems solved by technology

[0005] At the same time, different processing methods will also affect the speed planning algorithm. Especially for high-speed machining, it is impossible to guarantee that the processing speed will always be greater than the critical speed of high-speed machining during the entire machining process. characteristics, adopting a unified speed planning method may accelerate tool wear and reduce the reliability of the CNC system

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