EP0196406B1 - Method for manufacturing u-shaped core sheets - Google Patents

Method for manufacturing u-shaped core sheets Download PDF

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Publication number
EP0196406B1
EP0196406B1 EP19860100622 EP86100622A EP0196406B1 EP 0196406 B1 EP0196406 B1 EP 0196406B1 EP 19860100622 EP19860100622 EP 19860100622 EP 86100622 A EP86100622 A EP 86100622A EP 0196406 B1 EP0196406 B1 EP 0196406B1
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EP
European Patent Office
Prior art keywords
shaped
shaped core
legs
arms
laminations
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
EP19860100622
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German (de)
French (fr)
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EP0196406A1 (en
Inventor
Gmbh Schwabe
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Vossloh Schwabe Deutschland GmbH
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SCHWABE GmbH
Vossloh Schwabe GmbH
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Priority to AT86100622T priority Critical patent/ATE41555T1/en
Publication of EP0196406A1 publication Critical patent/EP0196406A1/en
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Publication of EP0196406B1 publication Critical patent/EP0196406B1/en
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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • 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
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
    • Y10T29/49078—Laminated
    • 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
    • Y10T29/49789—Obtaining plural product pieces from unitary workpiece
    • Y10T29/49794—Dividing on common outline
    • 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
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0491—Cutting of interdigitating products

Definitions

  • the invention relates to a method for producing U-shaped core sheets and between their legs matching T-shaped yoke sheets of a choke or a transformer, in particular for use as a series choke for gas discharge lamps, recesses being formed on the outer legs of the U-shaped core sheets, in which case Two mutually offset rows of U-shaped core sheets are punched out with the open sides opposite one another and with the outer legs in pairs, so that one pair of outer legs of the one row is laterally connected to an outer leg pair of the other row and from between the end faces of the outer leg pairs and the T-shaped yoke plates are punched out with the transverse spaces that are located at a distance from the center of the U-shaped core sheets, with transverse legs adjoining the center legs of the U-shaped core sheets en and starts from FR-A-2 070 783.
  • T-shaped return plates As ballasts for gas discharge lamps, chokes or transformers with U-shaped core sheets and with their transverse legs inserted between their outer legs, T-shaped return plates are known (AT-A-29 42 70). They have the advantage that the U-shaped core sheets enclosing the T-shaped return plate result in a mechanically stable structure, the parts of which on the abutting leg regions can be secured by interlocking interlocking locking devices and / or can be pressed against one another with pretensioning, as a result of which the required freedom from hum can be guaranteed with relatively simple means.
  • the basic disadvantage of this U / T punch cut of the core sheets is that there is a considerable amount of punching waste during punching. Various processes for the production of such core sheets have therefore already been specified, which serve the purpose of reducing the punching waste. However, other more or less major disadvantages all had to be accepted.
  • the T-shaped back plate was already split into two L-shaped partial plates, which can be punched out together with the U-shaped core plates without waste (DE-A-26 38 780). This means that three separate core parts have to be handled when installing the throttle, which is complex and undesirable. The mechanical stability of the entire core is also impaired.
  • the object of the invention is therefore to provide a method for punch-free production of U-shaped core sheets and between their legs matching T-shaped backing sheets, which can be carried out with a punching tool and no restrictions with regard to the electromagnetic conditions of the choke or the transformer about 1 of This means that undesirable reductions in cross-section of the magnetic path or compromises with regard to the length or the dimensions of the magnetically active core parts must be accepted.
  • the method mentioned in the introduction is carried out according to the invention in such a way that the T-shaped yoke plates with their longitudinal legs on the one side on an outer leg pair of the respective opposite row of U-shaped core sheets and on the other side on the longitudinal leg of an adjacent opposite T-shaped yoke plate are punched out laterally.
  • the width / height ratio of the legs of the sheets can also be freely selected in accordance with the respective electromagnetic design of the throttle. Both flat and high throttle designs can be easily produced. Furthermore, there is the possibility of punching the plates for chokes without waste, which have a defined air gap in their magnetic path, which lies between the longitudinal leg of the T-shaped return plates and the opposite central leg of the U-shaped core plates. Cores with little stray field and reinforced outer legs can equally well be produced without waste, while in addition there are no cross-sectional weakenings in particular on individual core legs, in particular due to manufacturing.
  • profiled recesses which, for example, have an essentially triangular cross-sectional shape, can be punched out to accommodate a clamping rail that clasps the outer legs. Impairment of the cross section of other core sheet metal parts is not caused by these recesses; the shape of the recesses can be chosen appropriately for any purpose.
  • the transverse legs of the T-shaped yoke plates are punched out with a length which is somewhat greater than the distance between the parallel inner sides of the U-shaped core plates. In this way, when installing the throttle when inserting the T-shaped yoke part, the outer legs of the U-shaped core part are pressed slightly outwards, with the result that the whole structure is pre-stressed and a higher stability can thus be achieved.
  • the arrangement can be made for this purpose in such a way that the T-shaped yoke plates are each formed on the end faces of their transverse legs with stamped extensions, the end face distance of which is somewhat larger than the distance between the parallel inner sides of the outer legs of the U-shaped core sheets and their Height is smaller than the height of the transverse legs, which otherwise correspond in length to the distance between the inner sides of the outer legs.
  • the transverse legs of the T-shaped yoke plates can also be punched out on the end faces at an angle to the center leg, so that when the T-shaped yoke part is pressed into the U-shaped core part, a pretension can also be generated at the connection points.
  • the jacket core of a choke or a transformer shown in FIG. 1 is layered from U-shaped core sheets 1 and T-shaped yoke sheets 2.
  • Each U-shaped core sheet 1 has two parallel, straight-sided outer legs 3 and a central leg 4 which extends at right angles and connects the two outer legs 3 to one another.
  • the T-shaped yoke plates 2 are pressed with their cross leg 5, from which a longitudinal leg 6 extends at a right angle.
  • An air gap 7, which may contain a deformable air gap insert, can be formed on the end face of the longitudinal legs 6.
  • the U-shaped core sheets 1 and the T-shaped yoke sheets 2 are punched out of a sheet metal strip of width 8 in the manner shown in FIG. 2 by a follow-on tool.
  • the arrangement is such that two rows 9, 10 of U-shaped core sheets 1 face each other with their open sides and interlock with outer legs 3 which are connected to one another in pairs.
  • the adjoining U-shaped core sheets 1 of the two rows 9, 10 are offset from one another in the longitudinal direction of the tape to such an extent that an outer pair of legs 3, 3 of one row is laterally connected laterally to an outer pair of legs 3, 3 of the U-shaped core sheets 1 of the other row.
  • All U-shaped core sheets 1 and all T-shaped backing sheets 2 have the same size and the same size boy.
  • the T-shaped yoke plates 2 are punched out of the free spaces formed between the end faces 11 of the outer leg pairs 3, 3 and the middle legs 4 of the U-shaped core sheets 1 which are at a distance from them.
  • the T-shaped yoke plates 2 with their cross legs 5 connect to the middle legs 4 of the U-shaped core sheets, the length of a cross leg 5 the Distance between the parallel inner sides of the outer legs 3 of a U-shaped core sheet 1 corresponds.
  • the T-shaped yoke plates 2 close with their longitudinal leg 6 on one side to an outer leg pair 3, 3 of the opposite row of U-shaped core sheets 1 and on the other side to the longitudinal leg 6 of an adjacent, opposite T-shaped yoke plate 2 laterally at.
  • the punching lines shown in FIG. 2 between the individual U-shaped core sheets 1 and the T-shaped backing sheets 2 show that all sheets are punched out of the sheet metal strip in the longitudinal direction without waste.
  • the outer legs 3 of the U-shaped core sheets 1 can be chosen as wide as the height of the U-T sheets 1, 2, d. H. the Eau cramp can be adapted to the respective requirements by choosing the appropriate bandwidth without any restrictions.
  • the arrangement according to FIG. 3 corresponds essentially to that according to FIG. 2.
  • Only on the outer legs 3 of the U-shaped core sheets 1 are externally profiled recesses 12 punched out, which are used to attach a U-shaped clamping rail that compresses the outer legs 3 in the finished throttle serve.
  • the longitudinal legs 6 of the T-shaped yoke plates 2 are shortened at 13 by a waste web which remains in between, with which throttles with an air gap 7 according to FIG. 1 can be produced.
  • T-shaped yoke plates 2 To the T-shaped yoke plates 2 with. To be able to press in prestress between the outer legs 3 of the U-shaped core sheets 1, these can easily be punched out with a somewhat greater length than this corresponds to the distance between the inner sides of the outer legs 3 of a U-shaped core sheet 1. For this purpose, it may be expedient to punch small rectangular extensions 14 on the end of the transverse legs 5, which have a length of approximately 2 / 100-3 / 100 mm and whose height is smaller than the height of the length of the distance between the inner sides the outer leg 3 of a U-shaped core sheet 1 corresponding cross leg 5. In addition, the cross legs 5 of the T-shaped yoke plates 2 can also be punched on the end face with a small slope 15 (FIG.
  • the maximum length of the cross legs 5 which is somewhat greater, ensures that the cross legs 5 are pressed in under tension between the outer legs 3.
  • the difference between the maximum and the minimum length on the outer or inner edge of a cross leg is on the order of 2 / 100-3 / 100 mm on each end face.
  • the strip-shaped punching pattern shown in FIG. 2 can correspond directly to the width of the sheet metal strip from which it is punched out. For economic reasons, however, it can also be expedient to arrange a plurality of such strip-shaped die-cut patterns next to one another on a sheet-metal strip width. H. to be stamped out without waste from correspondingly wider sheet metal strips.

Abstract

In a method for making U-shaped core laminations and T-shaped magnetic circuit closing elements fitting in between the legs thereof, in a choke, ballast or transformer, in particular for use as an accessory element in gas discharge lamps, two mutually offset rows of U-shaped core laminations having their open ends facing one another and having the pairs of adjacent outer legs thereof interfitting with one another are punched out in such a manner that one pair of outer legs of one row is laterally adjacent to one pair of outer legs of the other row, and the T-shaped magnetic circuit closing elements, with cross legs adjacent to the connecting middle legs of the U-shaped core lamination are punched out of the free spaces located between the ends of the pairs of outer legs and the connecting legs, located facing tem and spaced apart from them, of the U-shaped core laminations. The T-shaped magnetic circuit closing elements are punched out in such a position that their long, or center, legs on one side are laterally adjacent one pair of outer legs of the respective opposing row of U-shaped core laminations and on the outer side these long or center legs are laterally adjacent the long or center legs of a neighboring, opposed T-shaped magnetic circuit closing element. A punch die suitable for carrying out the method is also proposed.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung U-förmiger Kernbleche und zwischen deren Schenkel passender T-förmiger Rückschlußbleche einer Drossel oder eines Transformators, insbesondere zur Verwendung als Vorschaltdrossel für Gasentladungslampen, wobei an den Außenschenkeln der U-förmigen Kernbleche gegebenenfalls Ausnehmungen ausgebildet sind, bei dem zwei gegeneinander versetzte Reihen U-förmiger Kernbleche mit den offenen Seiten einander gegenüberliegend und mit den jeweils paarweise aneinanderliegenden Außenschenkeln ineinandergreifend derart ausgestanzt werden, daß jeweils ein Außenschenkelpaar der einen Reihe an einem Außenschenkelpaar der anderen Reihe seitlich anschließt und aus den zwischen den Stirnseiten der Außenschenkelpaare und den diesen im Abstand gegenüberliegenden Mitteischenkein der U-förmigen Kernbleche entstehenden freien Räumen die T-förmigen Rückschlußbleche mit an die Mittelschenkel der U-förmigen Kernbleche anschließenden Querschenkeln ausgestanzt werden und geht von der FR-A-2 070 783 aus.The invention relates to a method for producing U-shaped core sheets and between their legs matching T-shaped yoke sheets of a choke or a transformer, in particular for use as a series choke for gas discharge lamps, recesses being formed on the outer legs of the U-shaped core sheets, in which case Two mutually offset rows of U-shaped core sheets are punched out with the open sides opposite one another and with the outer legs in pairs, so that one pair of outer legs of the one row is laterally connected to an outer leg pair of the other row and from between the end faces of the outer leg pairs and the T-shaped yoke plates are punched out with the transverse spaces that are located at a distance from the center of the U-shaped core sheets, with transverse legs adjoining the center legs of the U-shaped core sheets en and starts from FR-A-2 070 783.

Als Vorschaltgeräte für Gasentladungslampen dienende Drosseln oder Transformatoren mit U-förmigen Kernblechen und mit mit ihren Querschenkeln zwischen deren Außenschenkel eingesetzten T-förmigen Rückschlußblechen sind bekannt (AT-A-29 42 70). Sie haben den Vorteil, daß sich mit den das T-förmige Rückschlußblech umschließenden U-förmigen Kernblechen ein mechanisch stabiles Gebilde ergibt, dessen Teile an den aneinanderstoßenden Schenkelbereichen durch formschlüssig ineinandergreifende Rasteinrichtungen gesichert und/oder mit Vorspannung gegeneinander gepreßt werden können, wodurch die erforderliche Brummfreiheit mit verhältnismäßig einfachen Mitteln gewährleistet werden kann. Der grundsätzliche Nachteil dieses U/T-Stanzschnittes der Kernbleche liegt darin, daß beim Stanzen ein erheblicher Stanzabfall anfällt. Es wurden deshalb schon verschiedene Verfahren zur Herstellung solcher Kernbleche angegeben, die dem Ziel dienen, den Stanzabfall zu verringern. Dabei mußten aber durchweg andere mehr oder weniger große Nachteile in Kauf genommen werden.As ballasts for gas discharge lamps, chokes or transformers with U-shaped core sheets and with their transverse legs inserted between their outer legs, T-shaped return plates are known (AT-A-29 42 70). They have the advantage that the U-shaped core sheets enclosing the T-shaped return plate result in a mechanically stable structure, the parts of which on the abutting leg regions can be secured by interlocking interlocking locking devices and / or can be pressed against one another with pretensioning, as a result of which the required freedom from hum can be guaranteed with relatively simple means. The basic disadvantage of this U / T punch cut of the core sheets is that there is a considerable amount of punching waste during punching. Various processes for the production of such core sheets have therefore already been specified, which serve the purpose of reducing the punching waste. However, other more or less major disadvantages all had to be accepted.

So wurde schon das T-förmige Rückschlußblech in zwei L-förmige Teilbleche aufgetrennt, die sich abfallos gemeinsam mit den U-förmigen Kernblechen ausstanzen lassen (DE-A-26 38 780). Damit müssen nun aber bei der Montage der Drossel drei getrennte Kernteile gehandhabt werden, was aufwendig und unerwünscht ist. Außerdem ist die mechanische Stabilität des ganzen Kernes beeinträchtigt.Thus, the T-shaped back plate was already split into two L-shaped partial plates, which can be punched out together with the U-shaped core plates without waste (DE-A-26 38 780). This means that three separate core parts have to be handled when installing the throttle, which is complex and undesirable. The mechanical stability of the entire core is also impaired.

Grundsätzlich Gleiches gilt für ein Verfahren (DE-A-27 45 701), bei dem die U-förmigen Kernbleche in zwei L-förmige Teilbleche unterteilt und die T-förmigen Rückschlußbleche dafür einstückig ausgestanzt wurden (DE-A-27 45 701). Dieses Verfahren hat noch den weiteren Nachteil, daß die L-förmigen Teilbleche und die T-förmigen Rückschlußbleche mit getrennten Werkzeugen gestanzt werden müssen, was die Herstellung erschwert. Dies gilt grundsätzlich auch für ein anderes Verfahren (DE-A-23 09 727), bei dem der Nachteil eines dreiteiligen Kernaufbaus zwar dadurch vermieden ist, daß M-förmige Kernbleche hergestellt werden, die sodann in die U-Form gebogen werden. Auch hier müssen der die T-förmigen Rückschlußbleche mit einem eigenen Werkzeug hergestellt werden.Basically the same applies to a method (DE-A-27 45 701) in which the U-shaped core sheets are divided into two L-shaped partial sheets and the T-shaped backing sheets are punched out in one piece for this purpose (DE-A-27 45 701). This method has the further disadvantage that the L-shaped partial sheets and the T-shaped return plates have to be punched with separate tools, which complicates the manufacture. This also applies in principle to another process (DE-A-23 09 727), in which the disadvantage of a three-part core structure is avoided by producing M-shaped core sheets, which are then bent into the U-shape. Here, too, the T-shaped yoke plates must be made with your own tool.

Schließlich ist noch ein Verfahren bekannt geworden (FR-A-2 070 783), von dem die Erfindung ausgeht und das das abfallose Stanzen von U-förmigen Kernblechen und T-förmigen Rückschlußblechen in einem Werkzeug gestattet. Dabei werden aber die T-förmigen Rückschlußbleche aus den von den Außenschenkeln der U-förmigen Rückschlußbleche seitlich begrenzten freien Räumen derart ausgestanzt, daß die Außenschenkel eines U-förmigen Kernbleches jeweils ein mit seinem Querschenkel dazwischenliegendes T-förmiges Rückschlußblech seitlich begrenzen. Der Längsschenkel dieses Rückschlußbleches wird seinerseits aus den beiden zwischen die Außenschenkel eines U-förmigen Kernbleches ragenden Außenschenkeln zweier gegenüberliegender U-förmiger Kernbleche ausgestanzt, mit dem Ergebnis, daß an diesen Außenschenkeln. notwendigerweise dem Mittelschenkel des T-förmigen Rückschlußbleches entsprechende Ausnehmungen entstehen. Dadurch wird in diesen Bereichen der für den magnetischen Fluß zur Verfügung stehende Materialquerschnitt der Außenschenkel der U-förmigen Kernbleche verkleinert. Die Breite und die Länge der Mittelschenkel der .T-förmigen Rückschlußbleche sind deshalb begrenzt. Außerdem können an der Außenseite der Außenschenkel der U-förmigen Kernbleche keine im Querschnitt etwa dreieckförmigen Ausnehmungen vorgesehen werden, wie sie zum Aufklemmen einer etwa U-förmigen Klemmschiene erforderlich sind, die die notwendige Vorspannung an den Schnittebenen der aneinanderstoßenden Kernteile der Drossel gewährleistet.Finally, a method has become known (FR-A-2 070 783) from which the invention is based and which permits the waste-free punching of U-shaped core sheets and T-shaped yoke sheets in one tool. In this case, however, the T-shaped yoke plates are punched out of the free spaces laterally delimited by the outer legs of the U-shaped yoke plates in such a way that the outer legs of a U-shaped core sheet each laterally delimit an intermediate T-shaped yoke plate with its transverse leg. The longitudinal leg of this yoke plate is in turn punched out of the two outer legs of two opposite U-shaped core sheets protruding between the outer legs of a U-shaped core sheet, with the result that these outer legs. recesses corresponding to the center leg of the T-shaped yoke plate are formed. As a result, the material cross section of the outer legs of the U-shaped core sheets available for the magnetic flux is reduced in these areas. The width and the length of the middle legs of the .T-shaped yoke plates are therefore limited. In addition, no triangular cross-sectional recesses can be provided on the outside of the outer legs of the U-shaped core sheets, as are required for clamping an approximately U-shaped clamping rail, which ensures the necessary pretension at the cutting planes of the abutting core parts of the throttle.

Aufgabe der Erfindung ist es deshalb, ein Verfahren zur stanzabfallosen Herstellung U-förmiger Kernbleche und zwischen deren Schenkel passender T-förmiger Rückschlußbleche zu schaffen, das sich mit einem Stanzwerkzeug durchführen läßt und keine Beschränkungen hinsichtlich der elektromagnetischen Gegebenheiten der Drossel oder des Transformators etwa 1 der Weise bedingt, daß unerwünschte Querschnittsverringerungen des magnetischen Pfades oder Kompromisse hinsichtlich der Länge oder der Abmessungen der magnetisch wirksamen Kernteile in Kauf genommen werden müssen.The object of the invention is therefore to provide a method for punch-free production of U-shaped core sheets and between their legs matching T-shaped backing sheets, which can be carried out with a punching tool and no restrictions with regard to the electromagnetic conditions of the choke or the transformer about 1 of This means that undesirable reductions in cross-section of the magnetic path or compromises with regard to the length or the dimensions of the magnetically active core parts must be accepted.

Zur Lösung dieser Aufgabe wird bei dem eingangs genannten Verfahren erfindungsgemäß derart vorgegangen, daß die T-förmigen Rückschlußbleche mit ihrem Längsschenkel auf der einen Seite an einem Außenschenkelpaar der jeweils gegenüberliegenden Reihe U-förmiger Kernbleche und auf ihrer anderen Seite an dem Längsschenkel eines benachbarten gegenüberliegenden T-förmigen Rückschlußbleches seitlich anliegend ausgestanzt werden.To achieve this object, the method mentioned in the introduction is carried out according to the invention in such a way that the T-shaped yoke plates with their longitudinal legs on the one side on an outer leg pair of the respective opposite row of U-shaped core sheets and on the other side on the longitudinal leg of an adjacent opposite T-shaped yoke plate are punched out laterally.

Bei diesem Verfahren können nicht nur die U-förmigen Kernbleche und die T-förmigen Rückschlußbleche mit einem Werkzeug abfallos ausgestanzt werden, sondern es kann auch das Breiten/Höhenverhältnis der Schenkel der Bleche frei entsprechend der jeweiligen elektromagnetischen Auslegung der Drossel gewählt werden. Es können ohne weiteres sowohl flache als auch hohe Drosselbauformen erzeugt werden. Weiterhin besteht die Möglichkeit, die Bleche für Drosseln abfallos zu stanzen, die einen definierten Luftspalt in ihrem magnetischen Pfad aufweisen, der zwischen dem Längsschenkel der T-förmigen Rückschlußbleche und dem gegenüberliegenden Mittelschenkel der U-förmigen Kernbleche liegt. Genauso gut können auch streufeldarme Kerne mit verstärkten Außenschenkeln abfallos hergestellt werden, während darüber hinaus insbesondere herstellungsbedingte Querschnittsschwächungen an einzelnen Kernschenkeln nicht vorhanden sind.In this method, not only can the U-shaped core sheets and the T-shaped backing sheets be punched out with a tool without waste, but the width / height ratio of the legs of the sheets can also be freely selected in accordance with the respective electromagnetic design of the throttle. Both flat and high throttle designs can be easily produced. Furthermore, there is the possibility of punching the plates for chokes without waste, which have a defined air gap in their magnetic path, which lies between the longitudinal leg of the T-shaped return plates and the opposite central leg of the U-shaped core plates. Cores with little stray field and reinforced outer legs can equally well be produced without waste, while in addition there are no cross-sectional weakenings in particular on individual core legs, in particular due to manufacturing.

Beim Ausstanzen werden alle Blechteile durch die Matrize gestanzt, wobei keine losen Teile anfallen, die mechanisch aus dem Werkzeug entfernt werden müssen. Dies ist die Voraussetzung für hohe Pressen-Hubzahlen und automatisches Paketieren der Bleche innerhalb des Werkzeuges und der Presse.When punching out, all sheet metal parts are punched through the die, whereby there are no loose parts that have to be mechanically removed from the tool. This is the prerequisite for high press strokes and automatic packaging of the sheets within the tool and the press.

In den Außenschenkeln der U-förmigen Kernbleche können zur Aufnahme einer die Außenschenkel umklammernden Klemmschiene eingerichtete profilierte Ausnehmungen ausgestanzt werden, die bspw. eine im wesentlichen dreieckförmige Querschnittsgestalt aufweisen. Eine Beeinträchtigung etwa des Querschnitts anderer Kernblechteile ist durch diese Ausnehmungen nicht bedingt ; die Gestalt der Ausnehmungen kann beliebig zweckentsprechend gewählt werden.In the outer legs of the U-shaped core sheets, profiled recesses, which, for example, have an essentially triangular cross-sectional shape, can be punched out to accommodate a clamping rail that clasps the outer legs. Impairment of the cross section of other core sheet metal parts is not caused by these recesses; the shape of the recesses can be chosen appropriately for any purpose.

Vorteilhaft ist es, wenn die Querschenkel der T-förmigen Rückschlußbleche mit einer etwas grö-βeren Länge als dem Abstand zwischen den parallelen Innenseiten der U-förmigen Kernbleche ausgestanzt werden. Auf diese Weise können bei der Montage der Drossel beim Einfügen des T-förmigen Rückschlußteiles die Außenschenkel des U-förmigen Kernteiles etwas nach außen gedrückt werden, mit dem Ergebnis, daß das ganze Gebilde unter Vorspannung gesetzt wird und sich damit eine höhere Stabilität erzielen läßt. Die Anordnung kann zu diesem Zwecke derart getroffen werden, daß die T-förmigen Rückschlußbleche an den Stirnseiten ihres Querschenkels jeweils mit angestanzten Fortsätzen ausgebildet werden, deren stirnseitiger Abstand etwas größer ist als der Abstand zwischen den parallelen Innenseiten der Außenschenkel der U-förmigen Kernbleche und deren Höhe kleiner ist als die Höhe der in ihrer Länge sonst im Abstand der Innenseiten der Außenschenkel entsprechenden Querschenkel.It is advantageous if the transverse legs of the T-shaped yoke plates are punched out with a length which is somewhat greater than the distance between the parallel inner sides of the U-shaped core plates. In this way, when installing the throttle when inserting the T-shaped yoke part, the outer legs of the U-shaped core part are pressed slightly outwards, with the result that the whole structure is pre-stressed and a higher stability can thus be achieved. The arrangement can be made for this purpose in such a way that the T-shaped yoke plates are each formed on the end faces of their transverse legs with stamped extensions, the end face distance of which is somewhat larger than the distance between the parallel inner sides of the outer legs of the U-shaped core sheets and their Height is smaller than the height of the transverse legs, which otherwise correspond in length to the distance between the inner sides of the outer legs.

Schließlich können die Querschenkel der T-förmigen Rückschlußbleche auch an den Stirnseiten zu dem Mittelschenkel hin geneigt verlaufend ausgestanzt werden, wodurch beim Einpressen des T-förmigen Rückschlußteiles in den U-förmigen Kernteil ebenfalls eine Vorspannung an den Verbindungsstellen erzeugt werden kann.Finally, the transverse legs of the T-shaped yoke plates can also be punched out on the end faces at an angle to the center leg, so that when the T-shaped yoke part is pressed into the U-shaped core part, a pretension can also be generated at the connection points.

Das erfindungsgemäße Verfahren ist in der Zeichnung veranschaulicht. Es zeigen :

  • Fig. 1 einen aus U-förmigen Kernblechen und T-förmigen Rückschlußblechen geschichteten Kern, in einer Seitenansicht,
  • Fig. 2 die Anordnung der U-förmigen Kernbleche und der T-förmigen Rückschlußbleche bei dem abfallosen Stanzverfahren gemäß der Erfindung, und
  • Fig. 3 die Anordnung nach Fig. 2, in einer abgewandelten Ausführungsform und in einer entsprechenden Darstellung.
The method according to the invention is illustrated in the drawing. Show it :
  • 1 is a side view of a core layered from U-shaped core sheets and T-shaped backing sheets,
  • Fig. 2 shows the arrangement of the U-shaped core sheets and the T-shaped yoke plates in the waste-free punching method according to the invention, and
  • Fig. 3 shows the arrangement of FIG. 2, in a modified embodiment and in a corresponding representation.

Der in Fig. 1 dargestellte Mantelkern einer Drossel oder eines Transformators ist aus U-förmigen Kernblechen 1 und T-förmigen Rückschlußblechen 2 geschichtet. Jedes U-förmige Kernblech 1 weist zwei parallele, geradflächig begrenzte Außenschenkel 3 und einen rechtwinklig dazu verlaufenden und die beiden Außenschenkel 3 miteinander verbindenden Mittelschenkel 4 auf. Zwischen die beiden Außenschenkel 3 sind die T-förmigen Rückschlußbleche 2 mit ihrem Querschenkel 5 eingepreßt, von dem mittig rechtwinklig ein Längsschenkel 6 abgeht. An der Stirnseite der Längsschenkel 6 kann ein Luftspalt 7 ausgebildet sein, der gegebenenfalls eine deformierbare Luftspalteinlage enthält.The jacket core of a choke or a transformer shown in FIG. 1 is layered from U-shaped core sheets 1 and T-shaped yoke sheets 2. Each U-shaped core sheet 1 has two parallel, straight-sided outer legs 3 and a central leg 4 which extends at right angles and connects the two outer legs 3 to one another. Between the two outer legs 3, the T-shaped yoke plates 2 are pressed with their cross leg 5, from which a longitudinal leg 6 extends at a right angle. An air gap 7, which may contain a deformable air gap insert, can be formed on the end face of the longitudinal legs 6.

Die U-förmigen Kernbleche 1 und die T-förmigen Rückschlußbleche 2 werden aus einem Blechband der Breite 8 in der aus Fig. 2 ersichtlichen Weise durch ein Folgewerkzeug ausgestanzt.The U-shaped core sheets 1 and the T-shaped yoke sheets 2 are punched out of a sheet metal strip of width 8 in the manner shown in FIG. 2 by a follow-on tool.

Die Anordnung ist dabei derart getroffen, daß zwei Reihen 9, 10 U-förmiger Kernbleche 1 mit ihren offenen Seiten einander gegenüberliegen und mit jeweils paarweise aneinander anschlie-βenden Außenschenkeln 3 ineinandergreifen. Die aneinander anschließenden U-förmigen Kernbleche 1 der beiden Reihen 9, 10 sind in Bandlängsrichtung gegeneinander soweit versetzt, daß immer ein Außenschenkelpaar 3, 3 der einen Reihe innen an einem Außenschenkelpaar 3, 3 der U-förmigen Kernbleche 1 der anderen Reihe seitlich anschließt. Alle U-förmigen Kernbleche 1 und alle T-förmigen Rückschlußbleche 2 haben die jeweils gleiche Größe und die jeweils gleichen Abmes-Jungen.The arrangement is such that two rows 9, 10 of U-shaped core sheets 1 face each other with their open sides and interlock with outer legs 3 which are connected to one another in pairs. The adjoining U-shaped core sheets 1 of the two rows 9, 10 are offset from one another in the longitudinal direction of the tape to such an extent that an outer pair of legs 3, 3 of one row is laterally connected laterally to an outer pair of legs 3, 3 of the U-shaped core sheets 1 of the other row. All U-shaped core sheets 1 and all T-shaped backing sheets 2 have the same size and the same size boy.

Aus dem zwischen den Stirnseiten 11 der Außenschenkelpaare 3, 3 und den diesen im Abstand gegenüberliegenden Mittelschenkeln 4 der U-förmigen Kernbleche 1 entstehenden freien Räumen werden die T-förmigen Rückschlußbleche 2 ausgestanzt. Dabei schließen die T-förmigen Rückschlußbleche 2 mit ihren Querschenkeln 5 an die Mittelschenkel 4 der U-förmigen Kernbleche an, wobei die Länge eines Querschenkels 5 dem Abstand zwischen den parallelen Innenseiten der Außenschenkel 3 eines U-förmigen Kernbleches 1 entspricht.The T-shaped yoke plates 2 are punched out of the free spaces formed between the end faces 11 of the outer leg pairs 3, 3 and the middle legs 4 of the U-shaped core sheets 1 which are at a distance from them. The T-shaped yoke plates 2 with their cross legs 5 connect to the middle legs 4 of the U-shaped core sheets, the length of a cross leg 5 the Distance between the parallel inner sides of the outer legs 3 of a U-shaped core sheet 1 corresponds.

Außerdem schließen die T-förmigen Rückschlußbleche 2 mit ihrem Längsschenkel 6 auf der einen Seite an ein Außenschenkelpaar 3, 3 der jeweils gegenüberliegenden Reihe U-förmiger Kernbleche 1 und auf ihrer anderen Seite an dem Längsschenkel 6 eines benachbarten, gegenüberliegenden T-förmigen Rückschlußbleches 2 seitlich an. In der Summe liegen somit zwischen den beiden Außenschenkeln 3 eines U-förmigen Rückschlußbleches 1 einer Reihe jeweils zwei Außenschenkel 3 zweier U-förmiger Kernbleche 1 der gegenüberliegenden Reihe und zwei Längsschenkel 6 zweier spiegelbildlich zueinander liegender Rückschlußbleche 2.In addition, the T-shaped yoke plates 2 close with their longitudinal leg 6 on one side to an outer leg pair 3, 3 of the opposite row of U-shaped core sheets 1 and on the other side to the longitudinal leg 6 of an adjacent, opposite T-shaped yoke plate 2 laterally at. In total, there are therefore two outer legs 3 of two U-shaped core sheets 1 of the opposite row and two longitudinal legs 6 of two backing sheets 2 lying in mirror image to one another between the two outer legs 3 of a U-shaped backing sheet 1 of a row.

Die aus Fig. 2 ersichtlichen Stanzlinien zwischen den einzelnen U-förmigen Kernblechen 1 und den T-förmigen Rückschlußblechen 2 zeigen, daß alle Bleche abfallos aus dem Blechband in dessen Längsrichtung ausgestanzt werden. Die Außenschenkel 3 der U-förmigen Kernbleche 1 können beliebig breit gewählt werden, wie auch die Höhe der U-T-Bleche 1, 2, d. h. die Eauhöhe durch entsprechende Wahl der Bandbreite ohne irgendwelche Beschränkungen an die jeweiligen Erfordernisse angepaßt werden kann.The punching lines shown in FIG. 2 between the individual U-shaped core sheets 1 and the T-shaped backing sheets 2 show that all sheets are punched out of the sheet metal strip in the longitudinal direction without waste. The outer legs 3 of the U-shaped core sheets 1 can be chosen as wide as the height of the U-T sheets 1, 2, d. H. the Eauhöhe can be adapted to the respective requirements by choosing the appropriate bandwidth without any restrictions.

Die Anordnung nach Fig. 3 entspricht im wesentlichen jener nach Fig. 2. Es sind lediglich an den Außenschenkeln 3 der U-förmigen Kernbleche 1 außen profilierte Ausnehmungen 12 angestanzt, die zur Anbringung einer die Außenschenkel 3 zusammenpressenden U-förmigen Klemmschiene bei der fertigen Drossel dienen. Außerdem sind die Längsschenkel 6 der T-förmigen Rückschlußbleche 2 bei 13 durch einen dazwischenbleibenden Abfallsteg verkürzt, womit Drosseln mit einem Luftspalt 7 entsprechend Fig. 1 hergestellt werden können.The arrangement according to FIG. 3 corresponds essentially to that according to FIG. 2. Only on the outer legs 3 of the U-shaped core sheets 1 are externally profiled recesses 12 punched out, which are used to attach a U-shaped clamping rail that compresses the outer legs 3 in the finished throttle serve. In addition, the longitudinal legs 6 of the T-shaped yoke plates 2 are shortened at 13 by a waste web which remains in between, with which throttles with an air gap 7 according to FIG. 1 can be produced.

Um die T-förmigen Rückschlußbleche 2 mit. Vorspannung zwischen die Außenschenkel 3 der U-förmigen Kernbleche 1 einpressen zu können, können diese ohne weiteres mit etwas größerer Länge ausgestanzt werden als dies dem Abstand zwischen den Innenseiten der Außenschenkel 3 eines U-förmigen Kernbleches 1 entspricht. Dazu kann es zweckmäßig sein, an den Querschenkeln 5 stirnseitig kleine rechteckige Fortsätze 14 anzustanzen, die eine Länge von ca. 2/100-3/100 mm aufweisen und deren Höhe kleiner ist als die Höhe des im übrigen in ihrer Länge dem Abstand der Innenseiten der Außenschenkel 3 eines U-förmigen Kernbleches 1 entsprechenden Querschenkels 5. Außerdem können die Querschenkel 5 der T-förmigen Rückschlußbleche 2 stirnseitig auch mit einer geringen, zu dem Mittelschenkel 6 hin verlaufenden Schräge 15 (Fig. 1) ausgestanzt werden, die gemeinsam mit der den Abstand der Innenseiten der Außenschenkel 3 eines U-förmigen Kernbleches 1 etwas übersteigenden maximalen Länge der Querschenkel 5 ein unter Vorspannung erfolgendes Einpressen der Querschenkel 5 zwischen die Außenschenkel 3 gewährleistet. Der Unterschied zwischen der maximalen und der minimalen Länge an der Außen- bzw. Innenkante eines Querschenkels liegt auf jeder Stirnseite in der Größenordnung von 2/100-3/100 mm.To the T-shaped yoke plates 2 with. To be able to press in prestress between the outer legs 3 of the U-shaped core sheets 1, these can easily be punched out with a somewhat greater length than this corresponds to the distance between the inner sides of the outer legs 3 of a U-shaped core sheet 1. For this purpose, it may be expedient to punch small rectangular extensions 14 on the end of the transverse legs 5, which have a length of approximately 2 / 100-3 / 100 mm and whose height is smaller than the height of the length of the distance between the inner sides the outer leg 3 of a U-shaped core sheet 1 corresponding cross leg 5. In addition, the cross legs 5 of the T-shaped yoke plates 2 can also be punched on the end face with a small slope 15 (FIG. 1) extending towards the middle leg 6, which together with the the distance between the inner sides of the outer legs 3 of a U-shaped core sheet 1, the maximum length of the cross legs 5, which is somewhat greater, ensures that the cross legs 5 are pressed in under tension between the outer legs 3. The difference between the maximum and the minimum length on the outer or inner edge of a cross leg is on the order of 2 / 100-3 / 100 mm on each end face.

Das in Fig. 2 dargestellte streifenförmige Stanzbild kann unmittelbar der Breite des Blechstreifens entsprechen, aus dem es ausgestanzt wird. Aus wirtschaftlichen Gründen kann es aber auch zweckmäßig sein, mehrere solcher streifenförmiger Stanzbilder auf einer Blechstreifenbreite nebeneinander anzuordnen, d. h. aus entsprechend breiteren Blechstreifen abfallos auszustanzen.The strip-shaped punching pattern shown in FIG. 2 can correspond directly to the width of the sheet metal strip from which it is punched out. For economic reasons, however, it can also be expedient to arrange a plurality of such strip-shaped die-cut patterns next to one another on a sheet-metal strip width. H. to be stamped out without waste from correspondingly wider sheet metal strips.

Claims (5)

1. A method of making U-shaped core laminations (1) and a T-shaped yoke laminations (2) fitting between the arms (3) thereof for a choke or a transformer, more particularly for use as a series choke reactor for gas discharge lamps, recesses (12) being if necessary formed in the outer arms (3) of the U-shaped core laminations (1), wherein two rows (9, 10) of U-shaped core laminations (1) offset in relation to one another are punched out with the open sides disposed opposite one another and so interengaging with the outer arms (3) bearing against one another in pairs that each pair (3) of outer arms of one row (9) laterally adjoins a pair (3) of outer arms of the other row (10) and the T-shaped yoke laminations
(2) having cross-arms (5) adjoining the central arms (4) of the U-shaped core laminations (1) are punched out of the free spaces produced between the end faces of the pairs (3) of outer arms and the central arms (4) of the U-shaped core laminations (1) disposed at a distance opposite the pairs (3) of outer arms, characterized in that the T-shaped yoke laminations (2) are punched out bearing laterally via their longitudinal arms (6) on one side against a pair (3) of outer arms of each opposite row of U-shaped core laminations and on their other side against the longitudinal arm of an adjacent opposite T-shaped yoke lamination (2).
2. A method according to claim 1, characterized in that profiled recesses (12) are punched out of the outer arms (3) of the U-shaped core laminations (1) to receive a clamping bar which engages around such outer arms.
3. A method according to claims 1 or 2, characterized in that the cross-arms (5) of the T-shaped yoke laminations (2) are punched out with a somewhat greater length than the distance between the parallel inner sides of the U-shaped core laminations (1).
4. A method according to claim 3, characterized in that the T-shaped yoke laminations (2) are each formed at the end faces of their cross- arm (5) with punched-out extensions whose endface distance is somewhat greater than the distance between the parallel inner sides of the outer arms of the U-shaped core laminations (1) and whose height is smaller than the height of the cross-arms (5), whose length otherwise corresponds to the distance between the inner sides of the outer arms (3).
EP19860100622 1985-03-26 1986-01-18 Method for manufacturing u-shaped core sheets Expired EP0196406B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86100622T ATE41555T1 (en) 1985-03-26 1986-01-18 METHOD OF MAKING U-SHAPED CORE PANELS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3510854 1985-03-26
DE19853510854 DE3510854A1 (en) 1985-03-26 1985-03-26 METHOD FOR THE PRODUCTION OF U-SHAPED CORE SHEETS AND T-SHAPED BACK-SHAPING SHEETS THAT MATCH BETWEEN THE SIDE OF THEM OF A THROTTLE OR A TRANSFORMER, ESPECIALLY FOR GAS DISCHARGE LAMPS

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EP0196406A1 EP0196406A1 (en) 1986-10-08
EP0196406B1 true EP0196406B1 (en) 1989-03-15

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US (1) US4711019A (en)
EP (1) EP0196406B1 (en)
CN (1) CN86102094A (en)
AT (1) ATE41555T1 (en)
AU (1) AU585960B2 (en)
BG (1) BG60613B2 (en)
DD (1) DD244231A5 (en)
DE (2) DE3510854A1 (en)
FI (1) FI80965C (en)
GR (1) GR860166B (en)
HU (1) HU193402B (en)
PL (1) PL148377B1 (en)
SU (1) SU1450764A3 (en)
UA (1) UA7588A1 (en)
YU (1) YU46521B (en)

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DE4139003A1 (en) * 1991-11-27 1993-06-03 May & Christe Gmbh MAGNETIC CORE IN THE SHELL DESIGN OF A THROTTLE OR TRANSFORMER, LAYERED FROM C AND I-SHAPED CORE SHEETS

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Publication number Publication date
ATE41555T1 (en) 1989-04-15
US4711019A (en) 1987-12-08
DE3510854A1 (en) 1986-10-02
YU43486A (en) 1988-02-29
FI80965C (en) 1990-08-10
BG60613B2 (en) 1995-10-31
DE3662477D1 (en) 1989-04-20
PL148377B1 (en) 1989-10-31
SU1450764A3 (en) 1989-01-07
HUT40855A (en) 1987-02-27
DD244231A5 (en) 1987-03-25
HU193402B (en) 1987-10-28
CN86102094A (en) 1986-09-24
YU46521B (en) 1993-11-16
EP0196406A1 (en) 1986-10-08
GR860166B (en) 1986-05-13
FI80965B (en) 1990-04-30
FI860805A0 (en) 1986-02-25
AU5522086A (en) 1986-10-02
FI860805A (en) 1986-09-27
UA7588A1 (en) 1995-09-29
AU585960B2 (en) 1989-06-29

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