Press system and control method for press system

Patent metadata

Field	Value
Publication number	US-11235545-B2
Application number	US-201716343824-A
Country	US
Kind code	B2
Filing date	Dec 4, 2017
Priority date	Mar 27, 2017
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A press system includes: a press device configured to perform press working on a workpiece; a detection device configured to detect a press load applied for the press working by the press device; a number acquisition device configured to acquire a number of cycles of press loading, for each section of a plurality of sections into which a press loading region over a total length of a slide stroke is divided; a stress calculation device configured to calculate a stress applied to the press device, the stress corresponding to the press load for each section of the press loading region; and a degree-of-fatigue calculation device configured to calculate a degree of fatigue of the press device, based on respective stresses applied to the press device and respective numbers of cycles of press loading, for the plurality of sections of the press loading region.

First claim

The invention claimed is:

1. A press system comprising:
a press device configured to perform press working on a workpiece;
a detection device configured to detect a press load applied for the press working by the press device;
a number acquisition device configured to acquire a number of cycles of press loading, for each section of a plurality of sections into which a press loading region over a total length of a slide stroke is divided, wherein the press loading region is divided into the plurality of sections at predetermined length intervals of the slide stroke;
a stress calculation device configured to calculate a stress applied to the press device, the stress corresponding to the press load for each section of the press loading region; and
a degree-of-fatigue calculation device configured to calculate a degree of fatigue of the press device, based on respective stresses applied to the press device and respective numbers of cycles of press loading, for the plurality of sections of the press loading region.

2. The press system according to claim 1 , further comprising an informing device configured to give predetermined information based on the degree of fatigue of the press device calculated by the degree-of-fatigue calculation device.

3. The press system according to claim 1 , wherein the press loading region is divided into the plurality of sections further based on predetermined press load intervals.

4. The press system according to claim 1 , wherein the degree-of-fatigue calculation device is configured to calculate a degree of fatigue based on the stress applied to the press device and the number of cycles of press loading, for each section of the press loading region, and calculate the degree of fatigue of the press device by determining a sum of respective degrees of fatigue for the plurality of sections.

5. The press system according to claim 2 , wherein
the informing device is configured to give
first predetermined information when the degree of fatigue of the press device calculated by the degree-of-fatigue calculation device is larger than a first predetermined value, and
second predetermined information when the degree of fatigue of the press device calculated by the degree-of-fatigue calculation device is larger than a second predetermined value.

6. A control method for a press system, the control method comprising:
performing press working on a workpiece;
detecting a press load applied for the press working;
acquiring a number of cycles of press loading, for each section of a plurality of sections into which a press loading region over a total length of a slide stroke is divided, wherein the press loading region is divided into the plurality of sections at predetermined length intervals of the slide stroke;
calculating a stress applied to a press device, the stress corresponding to the press load for each section of the press loading region; and
calculating a degree of fatigue of the press device, based on respective stresses applied to the press device and respective numbers of cycles of press loading, for the plurality of sections of the press loading region.

Assignees

• Komatsu Ind Corp

Inventors

• Kurokawa Takahiko

Classifications

• B30B1/26

  by cams, eccentrics, or cranks · CPC title

• B30B15/26

  Program-control arrangements · CPC title

• B30B15/0094

  Press load monitoring means (B30B15/281 takes precedence) · CPC title

• B30B15/28 Primary

  Arrangements for preventing distortion of, or damage to, presses or parts thereof · CPC title

• B30B13/00

  Methods of pressing not special to the use of presses of any one of the preceding main groups · CPC title