Tool damage detection device and computer-readable storage medium

Patent metadata

Field	Value
Publication number	US-2024024999-A1
Application number	US-202118252890-A
Country	US
Kind code	A1
Filing date	Nov 22, 2021
Priority date	Nov 25, 2020
Publication date	Jan 25, 2024
Grant date	—

Abstract

A tool damage detection device includes: a data acquisition unit that acquires load data indicating a load of a spindle and rotational speed data indicating a rotational speed of the spindle in a cutting feed section; an extraction unit that extracts, from the load data, evaluation data to be used for evaluation of occurrence of damage to a tool based on the rotational speed data; a detection unit that detects occurrence of damage to the tool using the evaluation data; and an output unit that outputs data indicating occurrence of damage to the tool when the detection unit detects the damage to the tool.

First claim

1 . A tool damage detection device comprising:
a data acquisition unit that acquires load data indicating a load of a spindle and rotational speed data indicating a rotational speed of the spindle in a cutting feed section; an extraction unit that extracts, from the load data, evaluation data to be used for evaluation of occurrence of damage to a tool based on the rotational speed data; a detection unit that detects occurrence of damage to the tool using the evaluation data; and an output unit that outputs data indicating occurrence of damage to the tool when the detection unit detects the damage to the tool.

2 . The tool damage detection device according to claim 1 , wherein the evaluation data is the load data in a section in which the spindle rotates forward and the rotational speed of the spindle is constant in the cutting feed section.

3 . The tool damage detection device according to claim 1 , wherein
the data acquisition unit further acquires coordinate value data indicating a coordinate value of a cutting point, and the extraction unit determines a type of machining performed by the tool based on the coordinate value data or based on the rotational speed data and the coordinate value data, and extracts the evaluation data depending on the determined type of machining.

4 . The tool damage detection device according to claim 3 , wherein, when the extraction unit determines that the type of the machining is tapping, the extraction unit extracts, as the evaluation data, the load data in a section in which the spindle rotates forward and the rotational speed of the spindle is constant in the cutting feed section.

5 . The tool damage detection device according to claim 1 , wherein
the data acquisition unit further acquires coordinate value data indicating a coordinate value of a cutting point, and the extraction unit extracts the evaluation data to be used for evaluation of occurrence of damage to the tool from the load data, based on the coordinate value data and the rotational speed data.

6 . The tool damage detection device according to claim 1 , wherein
the extraction unit further extracts reference load data serving as a reference for detecting damage to the tool from the load data, and the detection unit detects occurrence of damage to the tool based on the reference load data and the evaluation data.

7 . The tool damage detection device according to claim 6 , wherein the detection unit detects occurrence of damage to the tool based on at least one of a maximum value, a minimum value, and an average value of the reference load data and at least one of a maximum value, a minimum value, and an average value of the evaluation data.

8 . The tool damage detection device according to claim 7 , wherein the detection unit calculates at least one threshold from at least one of the maximum value, the minimum value, and the average value of the reference load data, and compares the calculated at least one threshold with at least one of the maximum value, the minimum value, and the average value of the evaluation data to detect occurrence of damage to the tool.

9 . A computer-readable storage medium storing an instruction that causes a computer to:
acquire load data indicating a load of a spindle and rotational speed data indicating a rotational speed of the spindle in a cutting feed section; extract, from the load data, evaluation data to be used for evaluation of occurrence of damage to a tool based on the rotational speed data; detect occurrence of damage to the tool using the evaluation data; and output data indicating occurrence of damage to the tool when the damage to the tool is detected.

Assignees

• Fanuc Corp

Inventors

• Kubo Mamoru

Classifications

• B23Q17/09 Primary

  for indicating or measuring cutting pressure or {for determining} cutting-tool condition, e.g. cutting ability, load on tool (arrangements preventing overload of tools B23Q11/04; devices for indicating failure of drills during boring B23B49/00) · CPC title

• G05B19/4065 Primary

  Monitoring tool breakage, life or condition · CPC title

• G05B2219/50203

  Tool, monitor condition tool · CPC title

• G05B2219/50205

  On tool breakage stop machine · CPC title

• B23Q17/0961

  by measuring power, current or torque of a motor · CPC title