EP0243564A2 - Méthode et dispositif pour démagnétiser des aciers - Google Patents

Méthode et dispositif pour démagnétiser des aciers Download PDF

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Publication number
EP0243564A2
EP0243564A2 EP86730189A EP86730189A EP0243564A2 EP 0243564 A2 EP0243564 A2 EP 0243564A2 EP 86730189 A EP86730189 A EP 86730189A EP 86730189 A EP86730189 A EP 86730189A EP 0243564 A2 EP0243564 A2 EP 0243564A2
Authority
EP
European Patent Office
Prior art keywords
electromagnet
load
electromagnets
demagnetization
switches
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Withdrawn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
EP86730189A
Other languages
German (de)
English (en)
Other versions
EP0243564A3 (fr
Inventor
Hans Ing.-Grad. Winter
Heinz-Günter Platen
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0243564A2 publication Critical patent/EP0243564A2/fr
Publication of EP0243564A3 publication Critical patent/EP0243564A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material

Definitions

  • the invention relates to a method for demagnetizing steels, which were held by an electromagnet, and an arrangement for performing the method.
  • a demagnetization device In a demagnetization device according to DE-OS 32 38 609, the object to be demagnetized is guided in the axial direction through an inner coil passage.
  • This demagnetization process requires an additional transport device either for the coil or for the object to be demagnetized, as well as an additional work step. This process works with AC voltage.
  • the object of the invention is therefore to provide a simple method for demagnetizing steels which were held by an electromagnet excited with direct current. This object is achieved by the method steps according to the main claim.
  • the position of the electromagnet can be precisely predetermined and is not purely accidental, as is possible when the electromagnet attracts the steel. This is particularly important when clamping tools in processing machines.
  • the electromagnet is only released after the demagnetization has been completed, depending on The mass and shape of the held or lifted object is 10 to 20 seconds. This expenditure of time is very small in relation to the demagnetization process according to DE-OS 32 38 609.
  • the demagnetization takes place by decaying alternating current, the amplitude and cycle times of which can be set.
  • the setting of the amplitudes and cycle times depends on the alloy of the material as well as on the mass and shape of the workpiece. In the process, it is also immaterial whether e.g. a thin-walled tube or a solid workpiece has been lifted or clamped.
  • the first counter circuit is just as high (100% of the original) in the excitation; only then does the controlled decay of the excitation take place.
  • the counter-switching takes place in smaller stages, which are then increased (e.g. 100%, 95%, 90%, 80%, 60%, 40%, 20%); then the excitement decays, leaving residual field strengths of less than 10 Oe (Oersted).
  • a controlled, antiparallel thyristor bridge which can be released by a limit switch assigned to the electromagnet, is provided for magnetizing and demagnetizing the load, wherein the limit switch can be assigned to a suspension eye of the electromagnet.
  • the limit switch can be assigned to a suspension eye of the electromagnet.
  • the converter 1 is connected via choke coils 11 and fuses 3 to a three-phase source, not shown.
  • Lines 2 lead from the converter 1 via fuses 3 and direct current contactors 14 to electromagnets 5.
  • the direct current contactors 14 are connected to the limit switches 4, which are shown in FIGS.
  • the converter 1 is connected to its control 6 via ten parallel lines 2a, which in addition to a resistor 7 has a variable resistor 8, which enables an external controller setpoint specification.
  • To the converter 1 to the electromagnets 5 leading line 2 are connected behind the fuses 3 connecting lines 2b, which lead to double-running voltage measuring devices 10.
  • Other protective circuits for example with varistor freewheeling diodes and protective resistors, are also possible.
  • a thyristor block with a plurality of thyristors 12 with a corresponding phase angle (amplitude of the direct current) is driven.
  • the inner anti-parallel block is blocked.
  • the initially conductive outer block is blocked and the anti-parallel inner block is initially driven with the same phase angle.
  • the two thyristor blocks are now controlled alternately after the infinitely adjustable cycle times with increasing phase angle (smaller current amplitude) until the system is switched off after swinging out (see point 35 in FIG. 3).
  • a load beam 20 has a plurality of suspension eyes 21 through which bolts 22 of bearing eyes 23 of the electromagnets 5 are guided.
  • a limit switch 4 is attached to each suspension eye 21 in the lower region. After the electromagnets 5 have been placed on the object to be lifted, the load crossbeam 20 with the suspension eyes 21 and the limit switches 4 fastened thereon is further lowered, the limit switches 4 reaching the area of switching triggers 24 which are fastened to the bearing eyes 23 of the electromagnets 5 . Only when the limit switches 4 are in operative connection with the switching triggers 24 is the electromagnets and then the load can be lifted.
  • a main line 25 leads from the electromagnet 5 and a line 26 leads from each of the limit switches 4 to the converter 1 on the load beam 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
EP86730189A 1986-04-21 1986-11-11 Méthode et dispositif pour démagnétiser des aciers Withdrawn EP0243564A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3613714 1986-04-21
DE19863613714 DE3613714A1 (de) 1986-04-21 1986-04-21 Verfahren und vorrichtung zum entmagnetisieren von staehlen

Publications (2)

Publication Number Publication Date
EP0243564A2 true EP0243564A2 (fr) 1987-11-04
EP0243564A3 EP0243564A3 (fr) 1988-01-07

Family

ID=6299328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86730189A Withdrawn EP0243564A3 (fr) 1986-04-21 1986-11-11 Méthode et dispositif pour démagnétiser des aciers

Country Status (2)

Country Link
EP (1) EP0243564A3 (fr)
DE (1) DE3613714A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686984A1 (fr) * 1994-06-09 1995-12-13 The Welding Institute Démagnétisation des matériaux

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007009361B4 (de) * 2007-02-23 2012-02-16 Bundesrepublik Deutschland, vertr. d. d. Bundesministerium für Wirtschaft und Technologie, dieses vertr. d. d. Präsidenten der Physikalisch-Technischen Bundesanstalt Verfahren und Vorrichtung zum Entmagnetisieren eines Objektes aus zumindest teilweise ferromagnetischem Material

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3005927A1 (de) * 1980-02-16 1981-09-03 Erich Dr.-Ing. 5300 Bonn Steingroever Entmagnetisier-verfahren
DD208263A1 (de) * 1981-10-29 1984-03-28 Klaus Liedloff Elektrische schaltungsanordnung zum magnetisieren und entmagnetisieren ferromagnetischer werkstoffe
DE3238609A1 (de) * 1982-10-19 1984-04-19 Eckart Dr.Rer.Nat. 2300 Kiel Hiss Entmagnetisierungseinrichtung
DE3500011A1 (de) * 1985-01-02 1985-06-13 Axel R. Dr.-Ing. 5900 Siegen Hidde Verfahren und anordnung zur geregelten entmagnetisierung stabfoermiger, ferromagnetischer und vergueteter halb- oder fertigfabrikate im laufenden produktionsprozess

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2059290C3 (de) * 1970-12-02 1974-04-11 Klauschenz & Perrot Ohg Industrieelektronik, 6231 Schwalbach Einrichtung zum Spannen, Lösen und Entmagnetisieren von auf einer elektromagnetischen Haltevorrichtung aufzuspannenden Werkstücken
US3895270A (en) * 1974-04-29 1975-07-15 Western Electric Co Method of and apparatus for demagnetizing a magnetic material
DE2728383C2 (de) * 1977-06-24 1984-11-29 Wagner Kg, Fabrik Elektromagnetischer Apparate, 8941 Heimertingen Umpolgerät für Elektromagnet-Spannplatten
IT1141165B (it) * 1980-02-06 1986-10-01 Sdm Sistemi & Dispositivi Magn Sistema e disposizione circuitale per la smagnetizzazione di magneti permanenti

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3005927A1 (de) * 1980-02-16 1981-09-03 Erich Dr.-Ing. 5300 Bonn Steingroever Entmagnetisier-verfahren
DD208263A1 (de) * 1981-10-29 1984-03-28 Klaus Liedloff Elektrische schaltungsanordnung zum magnetisieren und entmagnetisieren ferromagnetischer werkstoffe
DE3238609A1 (de) * 1982-10-19 1984-04-19 Eckart Dr.Rer.Nat. 2300 Kiel Hiss Entmagnetisierungseinrichtung
DE3500011A1 (de) * 1985-01-02 1985-06-13 Axel R. Dr.-Ing. 5900 Siegen Hidde Verfahren und anordnung zur geregelten entmagnetisierung stabfoermiger, ferromagnetischer und vergueteter halb- oder fertigfabrikate im laufenden produktionsprozess

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686984A1 (fr) * 1994-06-09 1995-12-13 The Welding Institute Démagnétisation des matériaux

Also Published As

Publication number Publication date
DE3613714A1 (de) 1987-10-22
EP0243564A3 (fr) 1988-01-07

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Inventor name: PLATEN, HEINZ-GUENTER

Inventor name: WINTER, HANS, ING.-GRAD.