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Title:
CARBURIZATION DETECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2010/098218
Kind Code:
A1
Abstract:
The disclosed carburization detection method includes a first procedure, in which magnetic materials are attached to a reference material which has the same electromagnetic characteristics as the test material and is not carburized, a second procedure, in which the magnetic strengths of the various magnetic materials are measured and an electromagnetic test output value is acquired for each magnetic material, a third procedure, in which the correlation between the measured magnetic strength values and the electromagnetic test output values is calculated, a fourth procedure, in which the magnetic strengths are measured for a multiplicity of carburized materials, a fifth procedure, in which the correlation between carburization depth and the measured magnetic strength values is calculated, a sixth procedure, in which a measured magnetic strength threshold value (Th2) corresponding to a carburization depth threshold value (Th1) is determined, a seventh procedure, in which an electromagnetic test output threshold value (Th3) corresponding to the measured magnetic strength threshold value (Th2) is determined, and an eighth procedure, in which the presence or absence of carburization in a test material is determined based on the magnitude relationship between the electromagnetic test output value of the test material and the electromagnetic test output threshold value (Th3).

Inventors:
HYODO Shigetoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
兵藤 繁俊 (〒41 大阪府大阪市中央区北浜4丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
TAKIMOTO Yoshikazu (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
Application Number:
JP2010/052147
Publication Date:
September 02, 2010
Filing Date:
February 15, 2010
Export Citation:
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Assignee:
Sumitomo Metal Industries, Ltd. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜4丁目5番33号 Osaka, 〒5410041, JP)
HYODO Shigetoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
兵藤 繁俊 (〒41 大阪府大阪市中央区北浜4丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
International Classes:
G01N27/72
Foreign References:
JP2000266727A2000-09-29
JP2004279054A2004-10-07
JP2009036682A2009-02-19
JPH03253555A1991-11-12
JPS626153A1987-01-13
JPH04145358A1992-05-19
JPH0688807A1994-03-29
JP2000266727A2000-09-29
JP2004279054A2004-10-07
JP2004279055A2004-10-07
Attorney, Agent or Firm:
OHNAKA Minoru (Daiichijuken Nagahoribashi-ekimae bldg. 4F, 3-6 Minamisemba 2-chome, Chuo-ku, Osaka-sh, Osaka 81, 〒5420081, JP)
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