EP0708460A2 - Fabrication de tÔles de noyau - Google Patents

Fabrication de tÔles de noyau Download PDF

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Publication number
EP0708460A2
EP0708460A2 EP95116167A EP95116167A EP0708460A2 EP 0708460 A2 EP0708460 A2 EP 0708460A2 EP 95116167 A EP95116167 A EP 95116167A EP 95116167 A EP95116167 A EP 95116167A EP 0708460 A2 EP0708460 A2 EP 0708460A2
Authority
EP
European Patent Office
Prior art keywords
sheets
strips
insulation
agent
phosphate
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Withdrawn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
EP95116167A
Other languages
German (de)
English (en)
Other versions
EP0708460A3 (fr
Inventor
Ake Davidsson
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.)
ABB Patent GmbH
Original Assignee
ABB Patent GmbH
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 ABB Patent GmbH filed Critical ABB Patent GmbH
Publication of EP0708460A2 publication Critical patent/EP0708460A2/fr
Publication of EP0708460A3 publication Critical patent/EP0708460A3/xx
Withdrawn legal-status Critical Current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
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating

Definitions

  • the invention relates to a process for the production of sheets or strips for use as core sheets for electrical machines, such as transformers, in particular distribution transformers, which sheets or strips are coated on both sides uniformly with an insulating agent, in particular based on phosphate, and thereafter to form a uniform, thin insulation layer are subjected to an annealing treatment and then cut to the desired final contour in a punching process.
  • the insulation layer which is usually formed from phosphate-containing material, serves, as already mentioned, to increase the fill factor, that is to say the iron content in the core volume, and thus to increase the efficiency of the electrical machine, as already mentioned.
  • This procedure according to the invention achieves two things, namely, on the one hand, a plurality of sheets or strips suitable for use as a core sheet are practically completed in one work step, the fill factor of the sheet metal core produced therefrom being increased at the same time is that the insulation thickness between two adjacent sheets of a stack of sheets produced according to the invention is about half less than that of a conventionally manufactured sheet.
  • the insulation layer which is applied to the lower sheet surface also serves as an insulation layer for the sheet lying above it. In this way, not only is less time required to produce at least two core sheets in comparison to the conventional method, but less insulation means is also required, quite apart from the fact that the filling factor is also increased by the reduced insulation layer thickness.
  • the insulation agent after the insulation agent has been applied to the inner surfaces of the sheets lying one above the other, these are pressed onto one another in a rolling process.
  • the sheets forming the stack are subjected to a further rolling process by means of which the sheets or strips lying on top of one another are bonded.
  • This rolling process takes place at an elevated temperature, preferably at approximately 800 °, whereby according to a further development of the invention it should be noted that the recrystallization threshold, that is to say the recrystallization temperature for the sheets or strips used, is not exceeded.
  • the insulation layer is applied to the outer surfaces of the sheets or strips lying one on top of the other in a second method step after the inner surfaces have already been provided with the insulation layer.
  • the insulation layer applied to the outer surfaces is made uniform and compacted by means of a subsequent rolling treatment.
  • the entire stack of sheets produced from the sheets lying on top of one another is then subjected to an annealing treatment which serves to improve the bonding of the insulation layer to the respective matrix, that is to say to the sheets or strips.
  • the desired binding of the insulating agent with the respective sheet or strip is achieved by introducing heat, in particular by annealing at a higher temperature, whereby in addition to the temperature level, both the annealing time and the annealing time are decisive .
  • Another advantage which is associated with the cutting of the sheets or strips used before application of the insulation layer, results from the fact that the excess constituents of the applied insulation agent, which escape during the subsequent rolling process, have to travel shorter distances to the edge, which again the leveling and quality of the finished Insulation layer and also the throughput speed of the sheets or strips benefits as well as the time required for this.
  • FIG. 1 shows a schematic illustration of a production line for carrying out the method according to the invention.
  • the single FIG. Shows a treatment system 10 for carrying out the method according to the invention for two sheets or strips 12, 13 which are fed separately to the device 10 and are connected to one another by an insulation layer 14 and thus leave the device 10 in one piece as a double sheet 16.
  • the sheet or strip 12 lying above and the sheet or strip 13 located below are first coated on their inner surfaces, that is to say on the mutually facing surfaces, by a coating device 20 with insulating agent and are each subjected to a rolling treatment in a downstream rolling arrangement 22, 23, in which the insulation layer applied on one side is evened out and compressed.
  • a coating device 20 with insulating agent and are each subjected to a rolling treatment in a downstream rolling arrangement 22, 23, in which the insulation layer applied on one side is evened out and compressed.
  • Magnesium powder is advantageously provided as the insulation agent and is wetted with a phosphate-based liquid when applied to the sheets or strips 12, 13.
  • the two sheets or strips 12, 13 are then brought together and pressed together in a common rolling arrangement 24.
  • the roller assembly 24 can also be a Upstream stripping device, not shown here, which serves to wipe off excess material in order to maintain a constant layer thickness of the insulation layer applied in each case.
  • the now one-piece double plate 16 the individual plates 12, 13 of which are connected to one another by the intermediate insulation layer 14, is pressed together in a third roller arrangement 26, which preferably consists of several roller pairs arranged one behind the other, so that the insulation layer between the two outside lying sheets 12, 13 is improved in their adhesive behavior.
  • the outer surfaces of the sheets 12, 13 are each coated with insulating means by a coating device 21, which is also homogenized and compressed in a downstream fourth roller arrangement 28 before the double sheet 16, which is now also coated on the outside, in a continuous furnace 30 is subjected to an annealing treatment.
  • the aim of the method according to the invention is not only to reduce the manufacturing time and the manufacturing effort, but also to improve the advantages in use of a sheet metal core produced in this way.
  • the manufacturing effort is reduced solely by the fact that approximately twice the production output is possible with practically the same time requirement.
  • the need for insulation material is reduced by at least 1/3, if not by half, since the layer thickness of the insulation layer between two outer sheets is very small and at most reaches the thickness of an outer insulation layer, which is completely sufficient for technical use and is even desirable.
  • each case only two sheets or are connected to one another by the method according to the invention, but it is fundamentally conceivable that more than just two sheets or strips can also be connected to one another in the manner according to the invention.
EP95116167A 1994-10-19 1995-10-13 Fabrication de tÔles de noyau Withdrawn EP0708460A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944437307 DE4437307A1 (de) 1994-10-19 1994-10-19 Herstellung von Kernblechen
DE4437307 1994-10-19

Publications (2)

Publication Number Publication Date
EP0708460A2 true EP0708460A2 (fr) 1996-04-24
EP0708460A3 EP0708460A3 (fr) 1996-05-08

Family

ID=6531131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116167A Withdrawn EP0708460A2 (fr) 1994-10-19 1995-10-13 Fabrication de tÔles de noyau

Country Status (3)

Country Link
EP (1) EP0708460A2 (fr)
JP (1) JPH08213267A (fr)
DE (1) DE4437307A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2773781A1 (fr) 2011-11-04 2014-09-10 Tata Steel UK Ltd Acier à grains orientés revêtu
CN109378948A (zh) * 2018-09-28 2019-02-22 温岭市钢锋冲件有限公司 一种硅钢冲片的生产工艺
CN110323055A (zh) * 2019-06-28 2019-10-11 横店集团东磁股份有限公司 一种纳米晶产品的制备装置以及制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6086098B2 (ja) * 2014-06-23 2017-03-01 Ｊｆｅスチール株式会社 積層電磁鋼板およびその製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1373096A (en) * 1971-09-22 1974-11-06 British Steel Corp Insulated steel sheet
US4496399A (en) * 1984-05-21 1985-01-29 Armco Inc. Method and aqueous coating compositions for forming anti-stick and insulative coatings on semi-processed and fully-processed electrical steels
JPS6335746A (ja) * 1986-07-31 1988-02-16 Kawasaki Steel Corp 電磁鋼板の絶縁被覆処理方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE209731C (fr) *
DE1006504B (de) * 1952-10-23 1957-04-18 Rudolf Wilhelm Moll Verfahren zur Isolierung von Transformator- und Dynamoblechen
US3210840A (en) * 1961-08-08 1965-10-12 Composite Metal Products Inc Stainless steel clad aluminum and methods of making same
US3173202A (en) * 1961-08-10 1965-03-16 S W Farber Inc Aluminum cladding
US3670278A (en) * 1966-06-09 1972-06-13 Westinghouse Electric Corp Bonded core structure comprising a plurality of glass coated electrical steel sheets
DE3126625A1 (de) * 1981-07-06 1983-03-24 Instytut Metalurgii Żelaza im. Stanislawa Staszica, Gliwice Anlage zum einseitigen beschichten von blechen und baendern mit einem schutzueberzug
CH662971A5 (de) * 1984-07-03 1987-11-13 Ver Drahtwerke Ag Verfahren zur herstellung eines aus mindestens zwei bestandteilen bestehenden verbundkoerpers.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1373096A (en) * 1971-09-22 1974-11-06 British Steel Corp Insulated steel sheet
US4496399A (en) * 1984-05-21 1985-01-29 Armco Inc. Method and aqueous coating compositions for forming anti-stick and insulative coatings on semi-processed and fully-processed electrical steels
JPS6335746A (ja) * 1986-07-31 1988-02-16 Kawasaki Steel Corp 電磁鋼板の絶縁被覆処理方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012 no. 248 (C-511) ,13.Juli 1988 & JP-A-63 035746 (KAWASAKI STEEL CORP) 16.Februar 1988, *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2773781A1 (fr) 2011-11-04 2014-09-10 Tata Steel UK Ltd Acier à grains orientés revêtu
EP2773781B1 (fr) * 2011-11-04 2015-07-01 Tata Steel UK Ltd Acier à grains orientés revêtu
CN109378948A (zh) * 2018-09-28 2019-02-22 温岭市钢锋冲件有限公司 一种硅钢冲片的生产工艺
CN109378948B (zh) * 2018-09-28 2020-07-14 温岭市钢锋冲件有限公司 一种硅钢冲片的生产工艺
CN110323055A (zh) * 2019-06-28 2019-10-11 横店集团东磁股份有限公司 一种纳米晶产品的制备装置以及制备方法
CN110323055B (zh) * 2019-06-28 2021-01-26 横店集团东磁股份有限公司 一种纳米晶产品的制备装置以及制备方法

Also Published As

Publication number Publication date
JPH08213267A (ja) 1996-08-20
EP0708460A3 (fr) 1996-05-08
DE4437307A1 (de) 1996-04-25

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