S-curve acceleration linear interpolation method adopting multi-period constant-acceleration transition for corner

Abstract

The invention relates to a S-curve acceleration linear interpolation method adopting multi-period constant-acceleration transition for a corner, which remains technical characteristics of original application patent (application number: 201210211398.4): the speed direction on the corner is changed by adopting multiple interpolation periods to perform the transition so as to improve the machining speed on the corner; simultaneously the interpolation based on the S-curve acceleration way is conducted for the corner and a straight-line section, so that the acceleration in the machining process is continuous, the vibration of a machine tool can be reduced, and the machining quality can be improved; and the patent application technology is supplemented and improved as follows: the acceleration and the acceleration direction in the corner transition process are set to be constant, the prospective treatment when the acceleration on a starting point and an ending point of the straight-line section is not zero is simplified, overall prospective treatment is performed for the adjustment of the corner transition interpolation time, so that the corner transition interpolation time can effectively supplement the interpolation method based on the S-curve acceleration way. Moreover, the method is low in calculation difficulty, fast in speed, stable and reliable in working performance and capable of meeting the real-time machining requirement.

Description

technical field [0001] The present invention relates to an improved method for multi-period corner small straight line segment interpolation based on S-curve acceleration and deceleration control for numerical control machine tools. An interpolation method belongs to the technical field of numerical control processing of numerical control machine tools. Background technique [0002] When CNC machine tools process complex curved surfaces, they usually discretize the processed surface into a large number of small straight line segments within the set processing accuracy range. In this way, during the processing of small straight sections, especially at corners, the machining direction of the CNC machine tool needs to be changed frequently, causing the CNC machine tool to start and stop frequently, which limits the processing speed, and is prone to vibration at the same time, which affects the processed surface Processing accuracy and surface finish. In addition, if the linea...

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Problems solved by technology

[0006] However, in practice, it is found that the defect of this interpolation method based on linear acceleration and deceleration is that there are discontinuous acceleration changes on the processing path, which may easily cause vibration of the machine tool and reduce the quality of the processed surface.

[0007] Therefore, the applicant submitted the invention patent application "Multi-period corner small straight line segment interpolation method based on S-curve acceleration and deceleration control" (application number: 201210211398.4) to improve the interpolation processing method of CNC machine tools. There are problems in the multi-cycle corner transition interpolation method of linear acceleration and deceleration. At the same time, after the implementation of the test, it is found that this method still needs to be improved and supplemented in the following aspects: During corner transition processing, the jerk direction has a sudden change, and it is easy to Vibration of CNC machine tools caused by processing

Moreover, when interpolating in the S-curve acceleration and deceleration mode, only consider the case where the acceleration of the starting point and the end point of the straight line segment is zero, although the calculation complexity of this case is low in the forward-looking processing, but in various actual situations found that this method also lacks the integrity of theoretical research on diversity

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