EP0114420B1 - Method of manufacturing a commutator for a d.c. electric machine - Google Patents

Method of manufacturing a commutator for a d.c. electric machine Download PDF

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Publication number
EP0114420B1
EP0114420B1 EP83200097A EP83200097A EP0114420B1 EP 0114420 B1 EP0114420 B1 EP 0114420B1 EP 83200097 A EP83200097 A EP 83200097A EP 83200097 A EP83200097 A EP 83200097A EP 0114420 B1 EP0114420 B1 EP 0114420B1
Authority
EP
European Patent Office
Prior art keywords
commutator
inductor
manufacturing
collector
annulus
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.)
Expired
Application number
EP83200097A
Other languages
German (de)
French (fr)
Other versions
EP0114420A1 (en
Inventor
Jean Dewinck
Lucien Hancart
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.)
Umicore NV SA
Original Assignee
Ateliers de Constructions Electriques de Charleroi SA
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 Ateliers de Constructions Electriques de Charleroi SA filed Critical Ateliers de Constructions Electriques de Charleroi SA
Priority to DE8383200097T priority Critical patent/DE3365369D1/en
Priority to AT83200097T priority patent/ATE21590T1/en
Priority to EP83200097A priority patent/EP0114420B1/en
Priority to US06/573,393 priority patent/US4598464A/en
Priority to JP59010928A priority patent/JPS59175356A/en
Publication of EP0114420A1 publication Critical patent/EP0114420A1/en
Application granted granted Critical
Publication of EP0114420B1 publication Critical patent/EP0114420B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/06—Manufacture of commutators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49011—Commutator or slip ring assembly

Definitions

  • the collector of an electric machine is a part that is highly stressed in service. Its development requires careful care since the collector, made up of copper strips and micaceous insulators arranged in a ring, must behave like a compact unit, despite the centrifugal forces, vibrations and overheating imposed by the operation.
  • the conventional method consists in subjecting it to artificial aging by a succession of radial loads, alternately made at room temperature and at a temperature of the order of 200 ° C., using appropriate tools.
  • each heating or cooling operation is spread over several hours.
  • the complete aging cycle of the collector is of the order of a week for large sizes.
  • the classic process immobilizes tools, ovens and cooling areas for several days and requires significant energy consumption.
  • Document US-A-1 329 277 describes for example such a method of manufacturing a collector.
  • the invention relates to a method of manufacturing a slip ring having the characteristics contained in claim 1.
  • Figure 1 shows a sole 1 supported by a foot 2 and provided on its upper face, with radial notches 3 used for positioning the constituent elements of the collector to be manufactured.
  • a cross 4 centered on the sole using a shoulder 5 carries studs 6, used for positioning the cross 4 on the sole 1 and studs 7 used for positioning an upper plate 8 also provided on its underside radial notches 9 arranged opposite the radial notches 3 of the sole 1.
  • the upper plate 8 is centered on the cross-member 4 using a shoulder 10 and is made integral with the sole using a threaded central rod 11 and a nut 12. Between the sole 1 and the upper plate 8 alternately slide manifold plates 13 and micaceous insulating plates 14 using the radial grooves 3 and 9 to serve as guides to the micaceous insulating plates 14 intended for the insulation of the manifold blades 13.
  • a support 15 provided with a tightening ring 16 pierced on its periphery with a number of holes 17.
  • the support 15 receives several segments 18 regularly distributed over the entire periphery and shaped to present between them oblique joints so as to act on all the blades 13 of the collector.
  • each segment 18 is shaped according to a cylinder 19 of diameter adapted to that of the collector to be produced and the outer surface of which is a truncated cone 20 adapted to the taper of a hoop 21.
  • the hoop 21 has holes 22 coinciding with the holes 17 of the crown 16 of the support 15 for sliding therein threaded rods 23 whose nuts 24 serve to bring the hoop 21 closer to the tightening ring 16.
  • This approximation which is in fact a depression of the hoop 21 corresponds to a radial displacement of the segments 18 resulting in a reduction in the diameter of the collector ring made up of the blades 13.
  • the mounting tool consisting of the sole 1, the cross member 4 and the upper plate 8 is used.
  • the assembly consists of sliding the blades 13 and the micaceous insulating plates 14 in the radial grooves 3 and 9 belonging respectively to the sole 1 and to the upper plate 8.
  • the support 15 is put. in place to receive the segments 18 distributed regularly around the periphery of the collector ring.
  • the hoop 21 is then slid around the segments 18 and then partially pressed in using the threaded rods 23 and their nuts 24.
  • FIG. 2 represents, the collector ring formed by the collector blades 13 and micaceous insulating plates 14, a loading tool 25 consisting of the segments 18, the hoop 21, the support 15 secured to the crown 16, threaded rods 23 and their nuts 24.
  • An inductor 26 is placed in the central part of the collector crown.
  • the inductor is in the form of a solenoid whose hollow turns 27 are spread over the entire length of the collector ring. The turns 27 are traversed by a refrigeration fluid and terminate in connection lugs 28.
  • a device for measuring the temperature of the blades 13, not shown, can modulate the heating power throughout the duration of the operation.
  • the inductor 26 By choosing a supply frequency, of the order of a few hundred KHz, adapted to the dimensions of the collector to be produced, the inductor 26 induces in the blades 13 superficial eddy currents which heat them as well as the wafers d micaceous insulator 14 with which they are in intimate contact. By constantly keeping the hoop 21 under load, it exerts, using the segments 18, a radial pressure on the blades 13 and the micaceous insulators 14, which contributes to a reduction in the diameter of the collecting crown. This reduction in diameter corresponds to a real loss of weight in the collector. At the start of the heating operation under pressure, this weight loss is first important, gradually reduces over time to tend asymptotically towards zero weight loss.
  • the inductor can be used in the shape of the inductor, either for example, an inductor of which one or more end turns are of larger diameter to better match the contour of the blades 13, or that the inductor is made of two half-coils inserted one from the top, the other from the bottom, each of these half-coils then having a profile very suitable for the blade 13.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • General Induction Heating (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Abstract

Disclosed is a process for the production of a collector in the form of a collector ring for use with direct current electric machines. The process consists of heating the collector ring, comprising copper sheets and insulating mica plates, assembled in a conventional apparatus by means of an inductor coaxial with the ring, and of exposing the collector ring to a radial pressure by applying to the apparatus a pressure of a predetermined value by means of a press.

Description

Le collecteur d'une machine électrique est une pièce fortement sollicitée en service. Son élaboration demande des soins attentifs puisqu'il faut que le collecteur, constitué de lamelles de cuivre et d'isolants micacés disposés en couronne, se comporte comme un ensemble compact, malgré les efforts centrifuges, les vibrations et les échauffements imposés par le fonctionnement.The collector of an electric machine is a part that is highly stressed in service. Its development requires careful care since the collector, made up of copper strips and micaceous insulators arranged in a ring, must behave like a compact unit, despite the centrifugal forces, vibrations and overheating imposed by the operation.

Pour obtenir un bon comportement du collecteur en service, le procédé classique consiste à soumettre celui-ci à un vieillissement artificiel par une succession de mises en charge radiales, faites alternativement à température ambiante et à une température de l'ordre de 200 °C, à l'aide d'un outillage approprié.To obtain good behavior of the collector in service, the conventional method consists in subjecting it to artificial aging by a succession of radial loads, alternately made at room temperature and at a temperature of the order of 200 ° C., using appropriate tools.

Compte tenu des masses importantes de la frette, des segments, des plateaux et du croisillon constituant l'outillage et de la masse du collecteur lui-même, chaque opération d'échauffement ou de refroidissement s'étale sur plusieurs heures. Le cycle complet de vieillissement du collecteur est de l'ordre d'une semaine pour les calibres importants. Le procédé classique immobilise pendant plusieurs jours, l'outillage, les fours et les aires de refroidissement et demande une consommation importante d'énergie.Given the large masses of the hoop, the segments, the plates and the spider constituting the tool and the mass of the collector itself, each heating or cooling operation is spread over several hours. The complete aging cycle of the collector is of the order of a week for large sizes. The classic process immobilizes tools, ovens and cooling areas for several days and requires significant energy consumption.

Le document US-A-1 329 277 décrit par exemple un tel procédé de fabrication de collecteur.Document US-A-1 329 277 describes for example such a method of manufacturing a collector.

La fabrication de collecteurs selon le procédé revendiqué remédie à ces inconvénients en s'opérant en un seul cycle d'échauffement sous charge à l'aide d'une installation de chauffage par induction montée sur une presse.The manufacture of manifolds according to the claimed process overcomes these drawbacks by operating in a single heating cycle under load using an induction heating installation mounted on a press.

L'invention concerne un procédé de fabrication d'une couronne collectrice présentant les caractéristiques contenues dans la revendication 1.The invention relates to a method of manufacturing a slip ring having the characteristics contained in claim 1.

Le procédé revendiqué est exposé en détails à l'aide des figures suivantes.

  • La figure 1 représente une demi-coupe d'une couronne collectrice et de l'outillage de montage et de mise en charge.
  • La figure 2 représente une demi-coupe d'une couronne collectrice, de son outillage de mise en charge et du dispositif de chauffage par induction.
The claimed process is explained in detail using the following figures.
  • FIG. 1 represents a half-section of a collector crown and of the assembly and loading tools.
  • Figure 2 shows a half-section of a collector ring, its loading tool and the induction heating device.

La figure 1 montre une semelle 1 supportée par un pied 2 et munie sur sa face supérieure, d'encoches radiales 3 servant au positionnement des éléments constitutifs du collecteur à fabriquer. Un croisillon 4 centré sur la semelle à l'aide d'un épaulement 5 porte des goujons 6, servant au positionnement du croisillon 4 sur la semelle 1 et des goujons 7 servant au positionnement d'un plateau supérieur 8 également muni à sa face inférieure d'encoches radiales 9 disposées vis-à- vis des encoches radiales 3 de la semelle 1.Figure 1 shows a sole 1 supported by a foot 2 and provided on its upper face, with radial notches 3 used for positioning the constituent elements of the collector to be manufactured. A cross 4 centered on the sole using a shoulder 5 carries studs 6, used for positioning the cross 4 on the sole 1 and studs 7 used for positioning an upper plate 8 also provided on its underside radial notches 9 arranged opposite the radial notches 3 of the sole 1.

Le plateau supérieur 8 est centré sur le croisillon 4 à l'aide d'un épaulement 10 et est rendu solidaire de la semelle à l'aide d'une tige centrale filetée 11 et d'un écrou 12. Entre la semelle 1 et le plateau supérieur 8 se glissent alternativement des lames de collecteur 13 et des plaquettes d'isolant micacé 14 en utilisant les rainures radiales 3 et 9 pour servir de guides aux plaquettes d'isolant micacé 14 destinées à l'isolation des lames de collecteur 13. Autour de la semelle 1 est disposée un support 15 muni d'une couronne de serrage 16 percée sur sa périphérie d'un certain nombre de trous 17. Le support 15 reçoit plusieurs segments 18 régulièrement répartis sur toute la périphérie et conformés pour présenter entre eux des joints obliques de façon à agir sur toutes les lames 13 du collecteur. La surface intérieure de chaque segment 18 est conformée selon un cylindre 19 de diamètre adapté à celui du collecteur à réaliser et dont la surface extérieure est un tronc de cône 20 adapté à la conicité d'une frette 21. La frette 21 porte des trous 22 coïncidant avec les trous 17 de la couronne 16 du support 15 pour y glisser des tiges filetées 23 dont les écrous 24 servent à rapprocher la frette 21 de la couronne de serrage 16. Ce rapprochement qui est en fait un enfoncement de la frette 21 correspond à un déplacement radial des segments 18 entraînant une réduction du diamètre de la couronne collectrice constituée des lames 13.The upper plate 8 is centered on the cross-member 4 using a shoulder 10 and is made integral with the sole using a threaded central rod 11 and a nut 12. Between the sole 1 and the upper plate 8 alternately slide manifold plates 13 and micaceous insulating plates 14 using the radial grooves 3 and 9 to serve as guides to the micaceous insulating plates 14 intended for the insulation of the manifold blades 13. Around of the sole 1 is disposed a support 15 provided with a tightening ring 16 pierced on its periphery with a number of holes 17. The support 15 receives several segments 18 regularly distributed over the entire periphery and shaped to present between them oblique joints so as to act on all the blades 13 of the collector. The inner surface of each segment 18 is shaped according to a cylinder 19 of diameter adapted to that of the collector to be produced and the outer surface of which is a truncated cone 20 adapted to the taper of a hoop 21. The hoop 21 has holes 22 coinciding with the holes 17 of the crown 16 of the support 15 for sliding therein threaded rods 23 whose nuts 24 serve to bring the hoop 21 closer to the tightening ring 16. This approximation which is in fact a depression of the hoop 21 corresponds to a radial displacement of the segments 18 resulting in a reduction in the diameter of the collector ring made up of the blades 13.

Au début de l'opération d'assemblage du collecteur, seul l'outillage de montage, constitué de la semelle 1, du croisillon 4 et du plateau supérieur 8, est utilisé. L'assemblage consiste à glisser les lames 13 et les plaquettes d'isolants micacé 14 dans les rainures radiales 3 et 9 appartenant respectivement à la semelle 1 et au plateau supérieur 8. Lorsque l'assemblage est terminé, le support 15 est mis. en place pour recevoir les segments 18 répartis régulièrement en périphérie de la couronne collectrice. La frette 21 est ensuite glissée autour des segments 18 puis enfoncée partiellement à l'aide des tiges filetées 23 et de leurs écrous 24.At the start of the collector assembly operation, only the mounting tool, consisting of the sole 1, the cross member 4 and the upper plate 8, is used. The assembly consists of sliding the blades 13 and the micaceous insulating plates 14 in the radial grooves 3 and 9 belonging respectively to the sole 1 and to the upper plate 8. When the assembly is completed, the support 15 is put. in place to receive the segments 18 distributed regularly around the periphery of the collector ring. The hoop 21 is then slid around the segments 18 and then partially pressed in using the threaded rods 23 and their nuts 24.

Lorsque la pression obtenue par boulonnage a donné lieu à une première réduction du diamètre de la couronne collectrice cette dernière ne doit plus être supportée par les plateaux 1 et 8. De ce fait l'outillage de montage (1, 4 et 8) est enlevé pour dégager la partie centrale. La suite des opérations peut se suivre sur la figure 2 qui représente, la couronne collectrice formée des lames de collecteur 13 et de plaquettes d'isolant micacé 14, un outillage de mise en charge 25 constitué des segments 18, de la frette 21, du support 15 solidarisé à la couronne 16, des tiges filetées 23 et de leurs écrous 24. Un inducteur 26 est placé dans la partie centrale de la couronne collectrice. Dans l'exemple de réalisation montré en figure 2, l'inducteur se présente sous forme d'un solénoïde dont les spires creuses 27 s'étalent sur toute la longueur de la couronne collectrice. Les spires 27 sont parcourues par un fluide de réfrigération et se terminent par des pattes de raccordement 28. Eventuellement, un appareil de mesure de la température des lames 13 non représenté peut moduler la puissance de chauffage pendant toute la durée de l'opération.When the pressure obtained by bolting has given rise to a first reduction in the diameter of the collecting crown, the latter must no longer be supported by the plates 1 and 8. Therefore the mounting tools (1, 4 and 8) are removed to clear the central part. The following operations can be followed in FIG. 2 which represents, the collector ring formed by the collector blades 13 and micaceous insulating plates 14, a loading tool 25 consisting of the segments 18, the hoop 21, the support 15 secured to the crown 16, threaded rods 23 and their nuts 24. An inductor 26 is placed in the central part of the collector crown. In the embodiment shown in Figure 2, the inductor is in the form of a solenoid whose hollow turns 27 are spread over the entire length of the collector ring. The turns 27 are traversed by a refrigeration fluid and terminate in connection lugs 28. Optionally, a device for measuring the temperature of the blades 13, not shown, can modulate the heating power throughout the duration of the operation.

Pendant qu'une presse, non représentée, exerce une charge constamment contrôlée sur la frette 21, l'inducteur 26 est alimenté en courant à haute fréquence.While a press, not shown, exerts a constantly controlled load on the hoop 21, the inductor 26 is supplied with high frequency current.

En choississant une fréquence d'alimentation, de l'ordre de quelques centaines de KHz, adaptée aux dimensions du collecteur à réaliser, l'inducteur 26 induit dans les lames 13 des courants de Foucault superficiels qui échauffent celles-ci ainsi que les plaquettes d'isolant micacé 14 avec lesquelles elles sont en contact intime. En gardant constamment la frette 21 sous charge, on exerce, à l'aide des segments 18 une pression radiale, sur les lames 13 et les isolants micacés 14, qui contribue à une réduction de diamètre de la couronne collectrice. Cette réduction de diamètre correspond à un véritable maigrissement du collecteur. En début d'opération du chauffage sous pression, ce maigrissement est d'abord important, se réduit peu à peu au fil du temps pour tendre de façon asymptotique vers un maigrissement nul. On contrôle l'évolution du maigrissement du collecteur soit en établissant pour chaque collecteur le diagramme, à pression constante par exemple, donnant l'enfoncement de la frette en fonction du temps, soit d'une manière plus commode en adoptant, pour chaque calibre de collecteur, une durée de mise en charge correspondant à l'enveloppe des temps enregistrés pour obtenir un maigrissement nul.By choosing a supply frequency, of the order of a few hundred KHz, adapted to the dimensions of the collector to be produced, the inductor 26 induces in the blades 13 superficial eddy currents which heat them as well as the wafers d micaceous insulator 14 with which they are in intimate contact. By constantly keeping the hoop 21 under load, it exerts, using the segments 18, a radial pressure on the blades 13 and the micaceous insulators 14, which contributes to a reduction in the diameter of the collecting crown. This reduction in diameter corresponds to a real loss of weight in the collector. At the start of the heating operation under pressure, this weight loss is first important, gradually reduces over time to tend asymptotically towards zero weight loss. We control the evolution of the weight loss of the collector either by establishing for each collector the diagram, at constant pressure for example, giving the depression of the hoop as a function of time, or in a more convenient way by adopting, for each caliber of collector, a loading duration corresponding to the envelope of the times recorded to obtain zero weight loss.

Il est évident que plusieurs variantes peuvent être utilisées dans la forme de l'inducteur, soit par exemple, un inducteur dont une ou plusieurs spires d'extrémité sont de plus grand diamètre pour mieux épouser le contour des lames 13, soit que l'inducteur est réalisé en deux demi-bobines introduites l'une par le haut, l'autre par le bas, chacune de ces demi-bobines ayant alors un profil très adapté à la lame 13.It is obvious that several variants can be used in the shape of the inductor, either for example, an inductor of which one or more end turns are of larger diameter to better match the contour of the blades 13, or that the inductor is made of two half-coils inserted one from the top, the other from the bottom, each of these half-coils then having a profile very suitable for the blade 13.

De même, on peut envisager une répartition spatiale des spires de l'inducteur selon un pas variable en fonction des volumes à échauffer.Similarly, it is possible to envisage a spatial distribution of the turns of the inductor according to a variable pitch as a function of the volumes to be heated.

Quant aux sondes permettant de relever la température atteinte par lés lames, toutes les solutions connues peuvent être utilisées pour moduler la puissance de chauffage de l'inducteur.As for the probes making it possible to read the temperature reached by the blades, all known solutions can be used to modulate the heating power of the inductor.

Claims (4)

1. Method of manufacturing a commutator annulus formed of segments (13) and of small plates of micaceous insulating material (14), these being put into a load applying apparatus (25) comprising segment elements (18), a hoop (21), a support (15) provided with a clamping annulus (16), screwthreaded rods (23) and clamping nuts (24), characterised in that the commutator annulus is heated by a coaxial inductor (26), and in that during the heating period the commutator annulus is subjected to a radial load the value of which is determined in accordance with a preestablished programme.
2. Manufacturing method according to claim 1, characterised in that the inductor (26) is formed of at least one solenoid extending-over all of or part of the height of the commutator segments (13) and having a smaller external diameter than the internal diameter of the annulus in the final state of the treatment.
3. Manufacturing method according to one of the preceding claims, characterised in that at least one temperature probe is arranged on one or more commutator segments (13) and is connected to a device varying the heating power of the inductor (26).
4. Manufacturing method according to one of the preceding claims, characterised in that an infrared sensing device is arranged in the vicinity of the commutator segments (13) and is connected to a device for varying the heating power of the inductor (26).
EP83200097A 1983-01-24 1983-01-24 Method of manufacturing a commutator for a d.c. electric machine Expired EP0114420B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8383200097T DE3365369D1 (en) 1983-01-24 1983-01-24 Method of manufacturing a commutator for a d.c. electric machine
AT83200097T ATE21590T1 (en) 1983-01-24 1983-01-24 PROCESS FOR MANUFACTURING A COLLECTOR FOR ELECTRICAL DIRECT CURRENT MACHINES.
EP83200097A EP0114420B1 (en) 1983-01-24 1983-01-24 Method of manufacturing a commutator for a d.c. electric machine
US06/573,393 US4598464A (en) 1983-01-24 1984-01-24 Process for the manufacture of collectors of direct current electric machines
JP59010928A JPS59175356A (en) 1983-01-24 1984-01-24 Method of producing current collector for dc electric machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83200097A EP0114420B1 (en) 1983-01-24 1983-01-24 Method of manufacturing a commutator for a d.c. electric machine

Publications (2)

Publication Number Publication Date
EP0114420A1 EP0114420A1 (en) 1984-08-01
EP0114420B1 true EP0114420B1 (en) 1986-08-20

Family

ID=8190923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83200097A Expired EP0114420B1 (en) 1983-01-24 1983-01-24 Method of manufacturing a commutator for a d.c. electric machine

Country Status (5)

Country Link
US (1) US4598464A (en)
EP (1) EP0114420B1 (en)
JP (1) JPS59175356A (en)
AT (1) ATE21590T1 (en)
DE (1) DE3365369D1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US593282A (en) * 1897-11-09 Apparatus for assembling commutator-bars
US855134A (en) * 1905-12-01 1907-05-28 Eureka Tempered Copper Works Commutator assembling and finishing device.
US1329277A (en) * 1919-02-12 1920-01-27 Toledo Standard Commutator Com Commutator and process of producing the same
SE381138B (en) * 1974-04-11 1975-11-24 Asea Ab HEAT TREATMENT PROCEDURE FOR SUCCESSFUL AGING OF A ROTATING ELECTRIC MACHINE INTENDED
US4032740A (en) * 1975-04-07 1977-06-28 Illinois Tool Works Inc. Two-level temperature control for induction heating
JPS55109523A (en) * 1979-02-15 1980-08-23 Inoue Japax Res Inc Electromagnetic forming apparatus

Also Published As

Publication number Publication date
DE3365369D1 (en) 1986-09-25
EP0114420A1 (en) 1984-08-01
US4598464A (en) 1986-07-08
ATE21590T1 (en) 1986-09-15
JPS59175356A (en) 1984-10-04

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