EP1032829A1 - Testmethode für bearbeitete werkstücke - Google Patents

Testmethode für bearbeitete werkstücke

Info

Publication number
EP1032829A1
EP1032829A1 EP97952139A EP97952139A EP1032829A1 EP 1032829 A1 EP1032829 A1 EP 1032829A1 EP 97952139 A EP97952139 A EP 97952139A EP 97952139 A EP97952139 A EP 97952139A EP 1032829 A1 EP1032829 A1 EP 1032829A1
Authority
EP
European Patent Office
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.)
Withdrawn
Application number
EP97952139A
Other languages
English (en)
French (fr)
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
Publication of EP1032829A1 publication Critical patent/EP1032829A1/de
Withdrawn legal-status Critical Current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)
EP97952139A 1997-11-21 1997-11-21 Testmethode für bearbeitete werkstücke Withdrawn EP1032829A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE1997/001967 WO1999027358A1 (en) 1997-11-21 1997-11-21 A testing method for machined workpieces

Publications (1)

Publication Number Publication Date
EP1032829A1 true EP1032829A1 (de) 2000-09-06

Family

ID=20407090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97952139A Withdrawn EP1032829A1 (de) 1997-11-21 1997-11-21 Testmethode für bearbeitete werkstücke

Country Status (4)

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

Families Citing this family (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

Family Cites Families (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
EP0033802B1 (de) * 1979-12-07 1984-08-08 Thorburn Technics (International) Limited Gerät und Sonde zur Wirbelstromprüfung
CA1158314A (en) * 1980-08-18 1983-12-06 Majesty (Her) In Right Of Canada As Represented By Atomic Energy Of Cana Da Limited 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
GB2233763B (en) * 1989-07-07 1994-06-15 Univ Essex Non-destructive testing of metals
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
US5698977A (en) * 1993-10-12 1997-12-16 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Eddy current method for fatigue testing
DE4412042C2 (de) * 1994-04-08 2001-02-22 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
See references of WO9927358A1 *

Also Published As

Publication number Publication date
WO1999027358A1 (en) 1999-06-03
JP2001524669A (ja) 2001-12-04
CA2310467A1 (en) 1999-06-03

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