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WO1999027358A1 - Methode d'essai pour pieces usinees - Google Patents

Methode d'essai pour pieces usinees Download PDF

Info

Publication number
WO1999027358A1
WO1999027358A1 PCT/SE1997/001967 SE9701967W WO9927358A1 WO 1999027358 A1 WO1999027358 A1 WO 1999027358A1 SE 9701967 W SE9701967 W SE 9701967W WO 9927358 A1 WO9927358 A1 WO 9927358A1
Authority
WO
WIPO (PCT)
Prior art keywords
determination
machined workpieces
probe
absolute
eddy current
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.)
Ceased
Application number
PCT/SE1997/001967
Other languages
English (en)
Inventor
Lena Eckerbom
Lars Brander
Anders Fransson
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.)
GKN Aerospace Sweden AB
Original Assignee
Volvo Aero AB
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 Volvo Aero AB filed Critical Volvo Aero AB
Priority to PCT/SE1997/001967 priority Critical patent/WO1999027358A1/fr
Priority to EP97952139A priority patent/EP1032829A1/fr
Priority to JP2000522446A priority patent/JP2001524669A/ja
Priority to CA002310467A priority patent/CA2310467A1/fr
Publication of WO1999027358A1 publication Critical patent/WO1999027358A1/fr
Anticipated expiration legal-status Critical
Ceased 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

Definitions

  • the present invention refers to a method for determination of the presence, if any, of detrimental surface changes, such as increased hardness or residual stress in machined workpieces.
  • Another possibility is to try to find cracks in the material, if any, by means of a fluorescent penetrating liquid.
  • the machining damages which might be present do not always cause cracks to occur until the part has been loaded and normally this does not occur during the production but only later in service.
  • a third frequent inspection method is eddy current testing with a differential probe. In carrying out this test two coils are used and the signal difference between the coils is observed. Said method is also well suited for localising cracks while long-term changes in the materials such as the machining damages aimed at in the present case, may fade away.
  • a supplementary checking method over the blue-etch-, the differential probe and the penetration methods would be highly desirable in order to provide for an establishment with certainty whether there are machining damages present due to local over-heating by worn tools, tool breakdown or the like.
  • the absolute probe used in connection with the present invention is of simplest possible design. More closely, it has the shape of a body with a cross section adapted to the geometry of the inspected surface and a coil wound around said body. This design makes the probe sensitive to everything having influence on the electrical conductivity or magnetic permeability of the material tested. It is also sensitive to everything which changes the relationship between the surface of the material and the probe. The result thereof is that also minor material changes might be measured such as changes in residual stress, dissolved foreign atoms in small percentages as well as composition variations etc.
  • the probe according to the invention is connected to an eddy current instrument and introduced with a uniform speed through the hole in a workpiece which is to be investigated.
  • the signal from the instrument is digitalized and stored in e.g. a PC. Measuring data are then treated in order to facilitate the evaluation.
  • the cylindrical probe body preferably is made of plastic and has a sufficient length for allowing a simple attachment for automatic measuring.
  • the diameter is adapted such that the probe guides itself through the hole .
  • the inventive absolute probe also makes it possible to identify surfaces of the workpiece which have been damaged in the manufacture, where the damaging action is very small.
  • testing might be automized and the inspection time will be short compared to other testing techniques.
  • the evaluation can be automized and measuring data might be stored for being traced and evaluated later.

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 Magnetic Means (AREA)

Abstract

L'invention concerne un procédé permettant de déterminer, à la surface de pièces usinées, la présence éventuelle de changements dommageables, tels qu'une dureté accrue ou une contrainte résiduelle. Selon l'invention, pour obtenir des résultats d'essais très fiables, cette détermination doit s'effectuer à l'aide d'une sonde à courant de Foucault de type absolu.
PCT/SE1997/001967 1997-11-21 1997-11-21 Methode d'essai pour pieces usinees Ceased WO1999027358A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/SE1997/001967 WO1999027358A1 (fr) 1997-11-21 1997-11-21 Methode d'essai pour pieces usinees
EP97952139A EP1032829A1 (fr) 1997-11-21 1997-11-21 Methode d'essai pour pieces usinees
JP2000522446A JP2001524669A (ja) 1997-11-21 1997-11-21 機械加工品のための検査方法
CA002310467A CA2310467A1 (fr) 1997-11-21 1997-11-21 Methode d'essai pour pieces usinees

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE1997/001967 WO1999027358A1 (fr) 1997-11-21 1997-11-21 Methode d'essai pour pieces usinees

Publications (1)

Publication Number Publication Date
WO1999027358A1 true WO1999027358A1 (fr) 1999-06-03

Family

ID=20407090

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/001967 Ceased WO1999027358A1 (fr) 1997-11-21 1997-11-21 Methode d'essai pour pieces usinees

Country Status (4)

Country Link
EP (1) EP1032829A1 (fr)
JP (1) JP2001524669A (fr)
CA (1) CA2310467A1 (fr)
WO (1) WO1999027358A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008052983A1 (de) 2008-10-23 2010-04-29 Mtu Aero Engines Gmbh Wirbelstromsensor und Verfahren zum Ermitteln von aufgrund thermischer Einflüsse veränderter Werkstoffeigenschaften in einem zu untersuchenden Bauteil mit Hilfe desselben

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033802A2 (fr) * 1979-12-07 1981-08-19 Thorburn Technics (International) Limited Appareil et sonde d'inspection par courants de Foucault
US4303885A (en) * 1979-06-18 1981-12-01 Electric Power Research Institute, Inc. Digitally controlled multifrequency eddy current test apparatus and method
GB2082330A (en) * 1980-08-18 1982-03-03 Ca Atomic Energy Ltd Eddy current surface probe
JPS6166958A (ja) * 1984-09-10 1986-04-05 Sumitomo Light Metal Ind Ltd 絶対値式渦流探傷装置
US5068608A (en) * 1989-10-30 1991-11-26 Westinghouse Electric Corp. Multiple coil eddy current probe system and method for determining the length of a discontinuity
US5258708A (en) * 1989-07-07 1993-11-02 University Of Essex Methods and apparatus for non-destructive testing of materials with eddy currents
DE4412042A1 (de) * 1994-04-08 1995-10-12 Juergen Rohmann Verfahren und Vorrichtung zur Wirbelstromprüfung von Bolzenbohrungen in mehrlagigen metallischen Strukturen
US5617024A (en) * 1993-10-12 1997-04-01 The United States Of America As Represented By The United States National Aeronautics And Space Administration Flux focusing eddy current probe

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4303885A (en) * 1979-06-18 1981-12-01 Electric Power Research Institute, Inc. Digitally controlled multifrequency eddy current test apparatus and method
EP0033802A2 (fr) * 1979-12-07 1981-08-19 Thorburn Technics (International) Limited Appareil et sonde d'inspection par courants de Foucault
GB2082330A (en) * 1980-08-18 1982-03-03 Ca Atomic Energy Ltd Eddy current surface probe
JPS6166958A (ja) * 1984-09-10 1986-04-05 Sumitomo Light Metal Ind Ltd 絶対値式渦流探傷装置
US5258708A (en) * 1989-07-07 1993-11-02 University Of Essex Methods and apparatus for non-destructive testing of materials with eddy currents
US5068608A (en) * 1989-10-30 1991-11-26 Westinghouse Electric Corp. Multiple coil eddy current probe system and method for determining the length of a discontinuity
US5617024A (en) * 1993-10-12 1997-04-01 The United States Of America As Represented By The United States National Aeronautics And Space Administration Flux focusing eddy current probe
DE4412042A1 (de) * 1994-04-08 1995-10-12 Juergen Rohmann Verfahren und Vorrichtung zur Wirbelstromprüfung von Bolzenbohrungen in mehrlagigen metallischen Strukturen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008052983A1 (de) 2008-10-23 2010-04-29 Mtu Aero Engines Gmbh Wirbelstromsensor und Verfahren zum Ermitteln von aufgrund thermischer Einflüsse veränderter Werkstoffeigenschaften in einem zu untersuchenden Bauteil mit Hilfe desselben
WO2010045936A2 (fr) 2008-10-23 2010-04-29 Mtu Aero Engines Gmbh Capteur à courants de foucault et procédé destiné à déterminer des propriétés de matériaux variant sous influences thermiques dans un élément à analyser au moyen de ce capteur
WO2010045936A3 (fr) * 2008-10-23 2010-10-07 Mtu Aero Engines Gmbh Capteur à courants de foucault et procédé destiné à déterminer des propriétés de matériaux variant sous influences thermiques dans un élément à analyser au moyen de ce capteur

Also Published As

Publication number Publication date
JP2001524669A (ja) 2001-12-04
EP1032829A1 (fr) 2000-09-06
CA2310467A1 (fr) 1999-06-03

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