Feed shaft diagnostic device and feed shaft diagnostic method for machine tool

Abstract

The invention provides a feed shaft diagnostic device and a feed shaft diagnostic method for a machine tool. On the basis of a control signal used in a feed shaft of a normal machine tool, abnormality detection of a rolling guide mechanism in consideration of the influence of a weight change of a workpiece can be performed. The feed axis diagnostic device is provided with a feed axis diagnostic unit (11) that detects an abnormality in a rolling guide mechanism (10) in a machine tool that machines a workpiece while driving a moving body (9) along a guide surface of the rolling guide mechanism (10) by means of a ball screw (8). A feed shaft diagnosis unit (11) acquires a feed speed during non-machining and a load applied to a ball screw (8) at the feed speed, and detects an abnormality on the basis of an approximation function calculated on the basis of the relationship between a plurality of feed speeds acquired under a plurality of different feed speed conditions within a predetermined period and the load.

Description

technical field [0001] The present invention relates to a feed axis diagnosis device and a feed axis diagnosis method of a machine tool having a feed axis that drives a moving body along a rolling guide mechanism. Background technique [0002] In the feed axes of machine tools in recent years, a system in which a moving body is driven by transmitting a rotational motion of a motor to a ball screw to enable movement along a rolling guide mechanism has been widely adopted. However, if the drive components such as the ball screw or the rolling guide mechanism deteriorate over time, foreign matter enters, or the lubrication is poor, the feed shaft will not operate normally, and the shape of the workpiece or the shape of the machined surface will be defective. Poor processing such as bad will have a bad impact on production. Therefore, in order to achieve stable production during the operation of machine tools, it is desired to detect machine abnormalities, notify managers and o...

AI Technical Summary

Problems solved by technology

That is, in the above-mentioned method, there are problems in that the cost of the sensor itself increases, the manufacturing cost increases due to the wiring work performed on the information collecting device, and the risk of failure due to the failure of the sensor itself increases.

In addition, loads, vibrations, and changes in the weight of workpieces that occur during workpiece processing can interfere with sensor output, and therefore there is a problem that a special operation for diagnosis is required that is different from normal operation.

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