Monitoring method and monitoring apparatus for machine tool, and machine tool

Abstract

The monitoring apparatus includes vibration sensors that detect vibration accompanying machining, a rotation detector and a rotation detection section that detect rotation of a main spindle, and a stability limit and vibration distribution calculation section that creates, on the basis of vibration information obtained from the vibration sensors and a rotation speed of the main spindle detected by the rotation detector and rotation detection section, both a stability limit diagram illustrating a relationship between the rotation speed and a stability limit of the machining and a vibration distribution diagram illustrating a relationship between the rotation speed and the vibration, and displays the created diagrams on a monitor in a vertical arrangement.

Description

technical field [0001] The present invention relates to a monitoring method and a monitoring device for monitoring a machining state related to vibration in a machine tool that performs machining while rotating a tool or workpiece attached to a spindle, and a machine tool having the same. Background technique [0002] In machine tools such as machining centers that perform machining while rotating a tool or workpiece attached to the main shaft, it is known that chatter occurs due to machining conditions such as the rotational speed or feed speed of the main shaft, which deteriorates the machined surface, or The tool suffers damage which also leads to a deterioration in the life of the tool. [0003] However, regarding the processing conditions such as the rotational speed at the time of the initial processing, it is nothing more than searching based on experience and trial and error. The operator records the processing conditions during the trial and error process, and read...

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Problems solved by technology

Therefore, it is necessary to display the actual machining value on the Campbell diagram to judge the chattering state. When checking the rotation speed, it is difficult to understand the relationship between the rotation speed and the magnitude of the vibration.

[0010] On the other hand, the method of Non-Patent Document 1 is effective for regenerative chatter, but assuming that the chatter of the end mill tool is completely iso-mode, it may not be possible to calculate the stability criticality of regenerative chatter under all machining conditions with high accuracy.

However, for operators with poor chatter knowledge, it is difficult to judge the stability critical line graph under the actual processing conditions only by looking at the stable critical line graph.

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