Constant-tension control method for diamond line cutting machine

Abstract

The invention discloses a constant-tension control method for a diamond line cutting machine. According to the constant-tension control method, the swing angle error e<theta> serves as the control basis, and the control target is to enable the swing angle error e<theta> to be 0; the feed-forward datum angular speed omegat is obtained through feed-forward control; the angular speed initial fine adjustment amount domega is obtained by utilizing the PID control algorithm through feedback control; the angular speed soft-limiting processing fine adjustment amount domegaL is obtained through soft-limiting processing; and finally, the feed-forward datum angular speed omegat calculated in feed-forward control is superposed with the angular speed soft-limiting processing fine adjustment amount domegaL, and thus the target angular speed omegay of a line roller is obtained. According to the control method, it can be ensured that line routing of the diamond line is steady and line routing tensionis constant, and tension fluctuation is avoided.

Description

technical field [0001] The invention relates to the field of cutting machinery and equipment, in particular to a constant tension control method of a diamond wire cutting machine. Background technique [0002] In recent years, with the rapid development of science and technology, the demand for hard and brittle materials such as monocrystalline silicon, polycrystalline silicon and piezoelectric ceramics has risen rapidly. As the main cutting equipment for hard and brittle materials such as solar silicon wafers, the diamond wire cutting machine has been more and more widely used due to its advantages of high cutting efficiency and good processing stability. [0003] The frame of the diamond wire cutting machine is equipped with a constant tension motor, a swing arm is fixed on the output shaft of the constant tension motor, and a swing guide wheel is installed on the free end of the swing arm through a tension sensor, and the diamond wire bypasses the swing guide wheel And o...

AI Technical Summary

Problems solved by technology

The above control method has the following disadvantages: First, the diamond wire is elastic, and the swing guide wheel is driven by the diamond wire to rotate passively. In this way, the tension will interfere with the detection accuracy of the tension sensor and cause fluctuations in the detection results. And drift, resulting in inaccurate final measurement results; moreover, because the swing guide wheel is not directly connected to the tension sensor, but indirectly connected through the wheel frame, separated by a layer, it is bound to further reduce the accuracy of the measurement results; moreover, because The cable tension is unbalanced, the swing angle of the swing arm has changed, and the tension sensor is based on the measurement of the swing arm in a vertical state. The left and right deviation of the swing arm will inevitably lead to changes in the tension force direction. The measured tension value naturally less accurate

To sum up, the existing technical solutions are based on inaccurate tension value measurement results, and the control effect is naturally unsatisfactory, the tension fluctuates greatly, the stability is poor, and even affects the cutting effect of the cutting machine.

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