Processing system and method for manufacturing metal member

Patent metadata

Field	Value
Publication number	US-11989006-B2
Application number	US-202017640350-A
Country	US
Kind code	B2
Filing date	Aug 31, 2020
Priority date	Sep 6, 2019
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

A processing system comprises a tool that processes a workpiece composed of a metal member, a motor that rotates the workpiece or the tool, a control unit that controls the motor, and a measurement unit that obtains an electrical quantity of the motor, wherein the control unit changes a rotational speed of the motor based on a difference between a first electrical quantity and a second electrical quantity, the first electrical quantity is an electrical quantity obtained by the measurement unit while the motor rotates before the workpiece is processed, and the second electrical quantity is an electrical quantity obtained by the measurement unit while the workpiece is processed.

First claim

The invention claimed is:

1. A processing system comprising:
a tool that processes a workpiece composed of a metal member;
a motor that rotates the workpiece or the tool;
a control unit that controls the motor; and
a measurement unit that obtains an electrical quantity of the motor, wherein
the control unit is configured to detect an abnormality with the tool based on a difference between a first electrical quantity and a second electrical quantity, and in response to the abnormality being detected, control the motor to stop rotating,
the first electrical quantity is an electrical quantity obtained by the measurement unit while the motor rotates before the workpiece is processed, and
the second electrical quantity is an electrical quantity obtained by the measurement unit while the workpiece is processed.

2. The processing system according to claim 1 , wherein the first electrical quantity and the second electrical quantity are at least one of a magnitude of a load current of the motor, a differential value of the load current of the motor, and an integral value of the load current of the motor.

3. The processing system according to claim 2 , wherein under a condition the difference is equal to or less than a threshold value, the control unit detects the abnormality has occurred.

4. The processing system according to claim 1 , wherein under a condition the difference is equal to or less than a threshold value, the control unit detects the abnormality has occurred.

5. The processing system according to claim 1 , wherein the abnormality is an indication the tool is broken.

6. The processing system according to claim 5 , wherein the control unit keeps the motor in a state of non-rotation at least until a replacement tool is substituted for the tool that is broken.

7. A method for manufacturing a metal member, comprising:
processing a workpiece composed of the metal member by using a tool while obtaining by a measurement unit an electrical quantity of a motor that rotates the tool or the workpiece, wherein
the processing includes detecting an abnormality with the tool based on a difference between a first electrical quantity and a second electrical quantity, and in response to detecting the abnormality, controlling the motor to stop rotating,
the first electrical quantity is an electrical quantity obtained by the measurement unit while the motor rotates before the workpiece is processed, and
the second electrical quantity is an electrical quantity obtained by the measurement unit while the workpiece is processed.

8. The method of claim 7 , wherein the first electrical quantity and the second electrical quantity are at least one of a magnitude of a load current of the motor, a differential value of the load current of the motor, and an integral value of the load current of the motor.

9. The method of claim 8 , wherein
under a condition the difference is equal to or less than a threshold value, the detecting including detecting that the abnormality has occurred.

10. The method of claim 7 , wherein
under a condition the difference is equal to or less than a threshold value, the detecting including detecting that the abnormality has occurred.

11. The processing method according to claim 7 , wherein the abnormality is an indication the tool is broken.

12. The processing method according to claim 11 , wherein the controlling comprises keeping the motor in a state of non-rotation at least until a replacement tool is substituted for the tool that is broken.

13. A processing system comprising:
a tool that processes a workpiece composed of a metal member;
a motor that rotates the workpiece or the tool;
control circuitry comprising a computer that controls the motor; and
a sensor that obtains an electrical quantity of the motor, wherein
the control circuitry is configured to detect an abnormality with the tool based on a difference between a first electrical quantity and a second electrical quantity, and in response to the abnormality being detected, control the motor to stop rotating,
the first electrical quantity is an electrical quantity obtained by the sensor while the motor rotates before the workpiece is processed, and
the second electrical quantity is an electrical quantity obtained by the sensor while the workpiece is processed.

14. The processing system according to claim 13 , wherein the first electrical quantity and the second electrical quantity are at least one of a magnitude of a load current of the motor, a differential value of the load current of the motor, and an integral value of the load current of the motor.

15. The processing system according to claim 14 , wherein under a condition the difference is equal to or less than a threshold value, the control circuitry detects the abnormality has occurred.

16. The processing system according to claim 13 , wherein under a condition the difference is equal to or less than a threshold value, the control circuitry detects the abnormality has occurred.

17. The processing system according to claim 13 , wherein the abnormality is an indication the tool is broken.

18. The processing system according to claim 17 , wherein the control circuitry keeps the motor in a state of non-rotation until a replacement tool is substituted for the tool that is broken.

Assignees

• Sumitomo Electric Sintered Alloy Ltd

Inventors

• Maeda Kazuo

Classifications

• G05B19/4155 Primary

  characterised by program execution, i.e. part program or machine function execution, e.g. selection of a program · CPC title

• 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

• G01R19/10

  Measuring sum, difference or ratio · CPC title

• G05B2219/41329

  DC motor · CPC title

• B23Q17/0957 Primary

  Detection of tool breakage (detecting failure of drills B23B49/001) · CPC title