Double-limit zero-return device for servo shaft of numerically controlled machine tool

Abstract

The invention discloses a double-limit zero-return device for a servo shaft of a numerically controlled machine tool, which comprises a first machine tool collision block, a first non-contact point proximity switch, a second machine tool collision block, a second non-contact point proximity switch, a servo motor and a programmable controller, wherein the first machine tool collision block and the first non-contact point proximity switch are mounted on the last transmission wheel of the servo shaft; the second machine tool collision block and the second non-contact point proximity switch are mounted on a low-gear-ratio gear; the ratio of the low-gear-ratio gear is higher than that of a gear of which the gear ratio is the lowest, and smaller than a gear of which the gear ratio is the highest; the servo motor is used for controlling the operation of the numerically controlled machine tool; and the I / O terminal of the programmable controller is electrically connected with the first non-contact point proximity switch, the second non-contact point proximity switch and the control terminal of the servo motor. The double-limit zero-return device has the advantage that when a monitoring result shows that the first non-contact point proximity switch mounted on a large gear generates a positive pulse signal, and another positive pulse signal generated by the second non-contact point proximity switch mounted on a gear of which the gear ratio is relatively low can play the role of searching zero pulses of a reference point. Therefore, each zero-return position of the servo shaft of the numerically controlled machine tool can be more accurate and stabler.

Description

technical field [0001] The invention relates to the technical field of numerical control machine tools, in particular to a dual-limit return-to-zero device for a servo axis of a numerical control machine tool. Background technique [0002] In order to meet the greater cutting force and better cutting characteristics of large-scale CNC gear machine tools, the machine tool generally adopts a servo axis with a large transmission ratio. Because of the large transmission ratio, there is a big difference in the position of the CNC machine tool when it returns to zero each time. deviation. It is in such a situation that the workpiece is restarted and returned to zero after the machine tool is powered off after the workpiece has not been processed, and the thickness of the machined tooth surface deviates from the thickness of the tooth surface that has been processed before the power failure. The machining accuracy of the machine tool is reduced, and even the workpiece will be scra...

AI Technical Summary

Problems solved by technology

[0002] In order to meet the greater cutting force and better cutting characteristics of large-scale CNC gear machine tools, the machine tool generally adopts a servo axis with a large transmission ratio. Because of the large transmission ratio, there is a big difference in the position of the CNC machine tool when it returns to zero each time. deviation

It is in such a situation that the machine restarts and returns to zero after the workpiece has not been processed, and the thickness of the machined tooth surface deviates from the thickness of the tooth surface that has been processed before the power failure.

The machining accuracy of the machine tool is reduced, and even the workpiece will be scrapped, causing immeasurable losses to the enterprise

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