Trigonometric function acceleration and deceleration control method for high-quality machining

Abstract

The invention relates to a trigonometric function acceleration and deceleration control method for high-quality machining. The method comprises a pre-interpolation stage and a real-time spline interpolation stage. In the preprocessing stage, a path to be machined is quickly interpolated, key information is recorded, and the trigonometric function speed equation in each acceleration and deceleration section is calculated. In the real-time spline interpolation stage, the real-time feed rate of a cutter is calculated according to the recorded information and the speed equations in the preprocessing stage, and then, next interpolation parameter is calculated in real time using a Newton iteration method, and real-time spline interpolation is carried out. The method is simple in control. Continuous change of speed, acceleration and jerk in the process of machining is realized, and fluctuation in feed rate is reduced. Therefore, the machining precision is guaranteed, overshoot caused by high-speed machining is eased, and flexible acceleration and deceleration control on a servo shaft is achieved. The method is suitable for high-quality processing.

Description

technical field [0001] The invention relates to the technical field of numerical control machining, in particular to a trigonometric function acceleration and deceleration control method for high-quality machining. Background technique [0002] Numerical control technology is the basis and core of modern advanced manufacturing technology, which reflects a country's manufacturing technology level to a large extent and is an important symbol to measure industrial modernization. [0003] Realizing high-speed machining and high-precision machining are two important goals of the CNC system. The speed of processing is directly related to the efficiency of processing, while the processing accuracy directly affects the quality of processing. With the development of modern science and technology and production, the field of machining and measurement puts forward higher and higher speed and precision requirements. High-speed, high-precision, and high-quality CNC machining puts forwa...

AI Technical Summary

Problems solved by technology

The traditional linear acceleration and deceleration control method has a small amount of calculation and simple control, but there is a sudden change in acceleration during acceleration or deceleration, which can easily cause vibration of the machine tool and affect the processing quality

During an acceleration or acceleration process of the S-curve speed planning algorithm, the speed equation is calculated in two or three segments, the control is more complicated, and the jerk changes four times in an acceleration or deceleration segment. When complex parts are used, it may cause vibration of the tool

The cubic polynomial speed planning algorithm is simple to control and can realize continuous changes in acceleration, but its jerk is still discontinuous. During one acceleration and deceleration process, its jerk mutation will still change twice, so this method is also not conducive to high quality processing

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