Machine tool, management system, and tool deterioration detection method

Patent metadata

Field	Value
Publication number	US-11007615-B2
Application number	US-201916711885-A
Country	US
Kind code	B2
Filing date	Dec 12, 2019
Priority date	Jan 21, 2019
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

A machine tool includes: a tool magazine that stores a plurality of tools; a spindle that holds one of the plurality of tools stored in the tool magazine; a glossiness measurement unit that measures glossiness of a tapered outer surface of a taper shank of each of the plurality of tools; a deterioration determination unit that determines whether or not the tapered outer surface is deteriorated on the basis of the glossiness measured by the glossiness measurement unit; and a notification unit that notifies an operator of deterioration of the tapered outer surface if it is determined by the deterioration determination unit that the tapered outer surface is deteriorated.

First claim

The invention claimed is:

1. A machine tool comprising:
a tool magazine that stores a plurality of tools;
a spindle that holds one of the plurality of tools stored in the tool magazine;
a glossiness measurement unit that measures glossiness of a tapered outer surface of a taper shank of each of the plurality of tools;
a deterioration determination unit that determines whether or not the tapered outer surface is deteriorated on the basis of the glossiness measured by the glossiness measurement unit; and
a notification unit that notifies an operator of deterioration of the tapered outer surface if it is determined by the deterioration determination unit that the tapered outer surface is deteriorated.

2. The machine tool according to claim 1 , wherein
the deterioration determination unit determines that the tapered outer surface is deteriorated if the glossiness measured by the glossiness measurement unit is equal to or less than a predetermined threshold.

3. The machine tool according to claim 2 , wherein
the predetermined threshold is set depending on a required machining accuracy of a work.

4. The machine tool according to claim 1 , wherein
the deterioration determination unit determines that the tapered outer surface is deteriorated if a temporal change amount of the glossiness measured by the glossiness measurement unit is equal to or greater than a predetermined threshold.

5. The machine tool according to claim 1 , wherein
the tool magazine has a fixing portion, and a rotary portion rotatable about a predetermined rotary axis with respect to the fixing portion, the rotary portion having a plurality of tool holders arranged in a circumferential direction about the predetermined rotary axis, and
the glossiness measurement unit is fixed to the fixing portion, and measures the glossiness of the tapered outer surface of a tool of the plurality of tools that is placed in a predetermined measurement position by rotation of the rotary portion.

6. The machine tool according to claim 1 , wherein
the glossiness measurement unit is fixed to the periphery of the spindle, and measures the glossiness of the tapered outer surface of a tool of the plurality of tools that moves relative to the spindle in a direction along a longitudinal axis of the spindle while the tool is passed between the tool magazine and the spindle.

7. The machine tool according to claim 1 further comprising
a storage that stores learning data regarding a relationship between glossiness measured by the glossiness measurement unit and machining quality of a work, and
a learning unit that uses the learning data stored in the storage to learn a reference for determining whether or not the tapered outer surface is deteriorated.

8. A management system comprising
a plurality of machine tools according to claim 1 , and
a host control system capable of communicating with each of the plurality of machine tools.

9. The management system according to claim 8 , wherein
the host control system
receives learning data regarding a relationship between glossiness measured by the glossiness measurement unit and machining quality of a work from each of the plurality of machine tools and accumulates the learning data, and
uses the accumulated learning data to learn a reference for determining whether or not the tapered outer surface is deteriorated.

10. The management system according to claim 8 , wherein
each of the plurality of machine tools includes
a storage that stores learning data regarding a relationship between glossiness measured by the glossiness measurement unit and machining quality of a work, and
a learning unit that uses the learning data stored in the storage to learn a reference for determining whether or not the tapered outer surface is deteriorated, and

the host control system receives a learning result of the learning unit from each of the plurality of machine tools and accumulates the learning results.

Assignees

• Fanuc Corp

Inventors

• Isobe Gaku

Classifications

• G01B11/303

  using photoelectric detection means · CPC title

• B23Q3/15526

  Storage devices; Drive mechanisms therefor · CPC title

• B23Q17/0904 Primary

  before or after machining · CPC title

• B23Q17/2457

  of tools · CPC title

• B23Q3/15553

  Tensioning devices or tool holders, e.g. grippers (driving working-spindles and adjusting or stopping them in a predetermined angular position B23Q5/20; securing milling cutters to the driving spindle in a given angular position B23C5/26) · CPC title