JPS5773670A - Method and device for electromagnetic induction flaw detection - Google Patents

Method and device for electromagnetic induction flaw detection

Info

Publication number
JPS5773670A
JPS5773670A JP55149723A JP14972380A JPS5773670A JP S5773670 A JPS5773670 A JP S5773670A JP 55149723 A JP55149723 A JP 55149723A JP 14972380 A JP14972380 A JP 14972380A JP S5773670 A JPS5773670 A JP S5773670A
Authority
JP
Japan
Prior art keywords
signal
cooling
flaw detection
generation part
send
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP55149723A
Other languages
Japanese (ja)
Inventor
Tatsuo Hiroshima
Takahide Sakamoto
Shoji Hayashibe
Akio Ueno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HARA DENSHI SOKKI KK
HARA DENSHI SOTSUKI KK
Nippon Steel Corp
Eddio Corp
Original Assignee
HARA DENSHI SOKKI KK
HARA DENSHI SOTSUKI KK
Sumitomo Metal Industries Ltd
Eddio Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HARA DENSHI SOKKI KK, HARA DENSHI SOTSUKI KK, Sumitomo Metal Industries Ltd, Eddio Corp filed Critical HARA DENSHI SOKKI KK
Priority to JP55149723A priority Critical patent/JPS5773670A/en
Publication of JPS5773670A publication Critical patent/JPS5773670A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9006—Details, e.g. in the structure or functioning of sensors

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

PURPOSE:To achieve high-precision flaw detection for a hot steel material, by cooling the steel material, including its surface, to prescribed depth down to magnetic transformation temperature and below sequentially and temporarily. CONSTITUTION:A signal generation part 10 outputs a temperature signal for the surface of a billet 1 measured by a temperature sensor 54. A flaw detection control part 11 compares the signal from the signal generation part 10 with a predetermined constant level to generate a flaw-detection start signal (a) and an end signal (b), thus controlling the energizing power source part of an inspecting coil 57. A cooling control 12 averages the signal from the generation part 10 at constant intevals of time, and discriminates the result by preset levels to output the result, thereby inputting a cooling control signal to the selection part 13 for cooling means. The input is classified by predetermined levels at the selection part 13 to send a release signal to a solenoid valve 56a corresponding to the level or to send a signal, operating a water feed pump 55, to a water feed pump control part 14, thereby performing cooling by compressed air and cooling water for proper use.
JP55149723A 1980-10-24 1980-10-24 Method and device for electromagnetic induction flaw detection Pending JPS5773670A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55149723A JPS5773670A (en) 1980-10-24 1980-10-24 Method and device for electromagnetic induction flaw detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55149723A JPS5773670A (en) 1980-10-24 1980-10-24 Method and device for electromagnetic induction flaw detection

Publications (1)

Publication Number Publication Date
JPS5773670A true JPS5773670A (en) 1982-05-08

Family

ID=15481402

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55149723A Pending JPS5773670A (en) 1980-10-24 1980-10-24 Method and device for electromagnetic induction flaw detection

Country Status (1)

Country Link
JP (1) JPS5773670A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090971A1 (en) * 2001-04-25 2002-11-14 Nkk Corporation Method of producing continuously cast pieces of steel

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53106085A (en) * 1977-02-28 1978-09-14 Nippon Steel Corp Ultrasonic inspecting method of hot steel materials

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53106085A (en) * 1977-02-28 1978-09-14 Nippon Steel Corp Ultrasonic inspecting method of hot steel materials

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002090971A1 (en) * 2001-04-25 2002-11-14 Nkk Corporation Method of producing continuously cast pieces of steel
US6896035B2 (en) 2001-04-25 2005-05-24 Nkk Corporation Manufacturing method for continuously cast product of steel
US7156148B2 (en) 2001-04-25 2007-01-02 Nkk Corporation Manufacturing method for continuously cast product of steel
US7448430B2 (en) 2001-04-25 2008-11-11 Nkk Corporation Manufacturing method for continuously cast product of steel

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