Tool breakage detection device and machine tool equipped therewith

The tool breakage detection device addresses sensor wear by rotating the contact sensor to a new surface, ensuring accurate detection and reducing costs, thus preventing substandard workpieces and extending sensor lifespan.

DE102017218367B4Active Publication Date: 2026-06-18DMG MORI CO LTD
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
DMG MORI CO LTD
Filing Date
2017-10-13
Publication Date
2026-06-18

AI Technical Summary

Technical Problem

Conventional tool breakage detection devices suffer from sensor wear due to repeated contact with the tool end, leading to inaccurate detection and high replacement costs, with the process of replacing the sensor being structurally difficult and time-consuming.

Method used

A tool breakage detection device with a contact sensor that rotates about its axis to expose a new, undamaged contact surface when wear occurs, allowing for quick and cost-effective replacement, and includes a mechanism with multiple contact surfaces to extend the sensor's lifespan.

Benefits of technology

Accurate tool end breakage detection is maintained with reduced costs by rotating the contact sensor to a new surface, preventing substandard workpieces and extending the sensor's service life, while allowing detection during machine operation without affecting the machining process.

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Abstract

Device (30) that detects the breakage of the front end of a tool (T) for machining, which is used in a machine tool (1), wherein the tool breakage detection device (30) with a contact transmitter (60) which is located in a position opposite the front end of the tool (T) which is held in a certain position, a movement mechanism (31) which has a holding component (41) that holds the contactor (60) and moves the contactor (60) between a contact point (P6) where the contactor (60) comes into contact with the front end of the tool (T) and a retraction position (P4) separate from the front end of the tool (T), a contact point detector (50) which detects, in the direction of movement of the contact transmitter (60), the point at which the contact transmitter (60) made contact with the front end of the tool (T), and is equipped with a break detection element (55) which, based on a standard contact position with respect to the front end of the tool (T) and the contact position detected by the contact point detector (50), determines the presence of a break in the front end of the tool (T), wherein the contact transmitter (60) consists of a polyhedron having at least three contact surfaces about the axis orthogonal to the direction of movement, and is held by the holding component (41) in such a way that it is rotatable about the axis, and a position opposite the front end of the tool (T) can be indicated to the respective contact surfaces.
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