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Title:
METALLIC PRESS-FORMED PIECE CRACK DETERMINING METHOD, APPARATUS, PROGRAM AND RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2010/041662
Kind Code:
A1
Abstract:
In a press forming for which a crack identification is carried out, an acquiring means (101) acquires, as crack identification data, strain of a metallic mold measured by a strain measuring means (8) during a period from a start time to a termination time of the press forming and further, acquires, by measuring or other means, production conditions as crack identification data.  An extracting means (102) extracts, as comparison data, reference data from a storing means (104) when the sum of differences between the production conditions of the extracted reference data and the production conditions of the crack identification data becomes a minimum.  A crack identifying means (103) compares the strain of the comparison data extracted by the extracting means (102) with the strain of the crack identification data, and when the maximum value of the difference therebetween is greater than a predetermined value, the identifying means (103) determines that a crack has occurred in the press-formed piece.  In this way, any cracks during press forming of any one of various types of metallic materials, such as ferrous materials, nonferrous materials and laminated materials, can be determined with high precision.

Inventors:
KUWAYAMA, Takuya (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)
桑山 卓也 (〒71 東京都千代田区丸の内二丁目6番1号 新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
SETO, Atsushi (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)
Application Number:
JP2009/067416
Publication Date:
April 15, 2010
Filing Date:
October 06, 2009
Export Citation:
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Assignee:
NIPPON STEEL CORPORATION (6-1 MARUNOUCHI 2-CHOME, CHIYODA-KU Tokyo, 71, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目6番1号 Tokyo, 〒1008071, JP)
KUWAYAMA, Takuya (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)
桑山 卓也 (〒71 東京都千代田区丸の内二丁目6番1号 新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
International Classes:
B21D22/00; B21D22/20; B21D37/00
Domestic Patent References:
Foreign References:
JPH0475800A
JPH0234225A
JP2006075884A
JP2005161399A
JPH05337554A
JPH0929358A
JP2005199336A
JP2005254300A
JP2006136926A
JP2006075884A
JP2004249365A
Other References:
See also references of EP 2345488A1
PROCEEDINGS OF ANNUAL CONGRESS OF JSAE 2007, pages 17 - 20
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (5th Floor, NBF Ikebukuro City Building 17-8, Higashi-Ikebukuro 1-chome, Toshima-k, Tokyo 13, 〒1700013, JP)
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