EP2040512A2 - Dispositif et procédé destinés au réchauffement inductif d'une pièce à usiner conductrice électriquement - Google Patents

Dispositif et procédé destinés au réchauffement inductif d'une pièce à usiner conductrice électriquement Download PDF

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Publication number
EP2040512A2
EP2040512A2 EP08010441A EP08010441A EP2040512A2 EP 2040512 A2 EP2040512 A2 EP 2040512A2 EP 08010441 A EP08010441 A EP 08010441A EP 08010441 A EP08010441 A EP 08010441A EP 2040512 A2 EP2040512 A2 EP 2040512A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
magnetic core
air gap
electrically conductive
shaped
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.)
Granted
Application number
EP08010441A
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German (de)
English (en)
Other versions
EP2040512A3 (fr
EP2040512B1 (fr
Inventor
Patrick Ziegler
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.)
Soudronic AG
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Soudronic 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
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Publication of EP2040512A2 publication Critical patent/EP2040512A2/fr
Publication of EP2040512A3 publication Critical patent/EP2040512A3/fr
Application granted granted Critical
Publication of EP2040512B1 publication Critical patent/EP2040512B1/fr
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/365—Coil arrangements using supplementary conductive or ferromagnetic pieces

Definitions

  • the invention relates to an apparatus and a method for inductive heating of an electrically conductive workpiece, which is formed in the form of a closed loop, according to the preamble of the independent claims.
  • a workpiece formed in the form of a closed loop is meant any workpiece that includes an opening, such as an annular workpiece or an ellipsoidal, square or rectangular workpiece that encloses an opening, which may also be ellipsoidal, square or rectangular can.
  • the workpiece may be a lid blank with an enclosed opening as used to make a lid with a tear-open film.
  • a method and apparatus for making covers with a film are known.
  • the known device has a conveying device and a plurality of processing stations and a test station.
  • the conveyor conveys lid blanks to the individual processing stations or to the testing station.
  • a lid blank with an enclosed opening is created by stamping an opening into a disk by punching.
  • the inner edge of the lid blank is pulled down in the next processing station.
  • a tabbed film is placed over the enclosed opening of the lid blank and secured by heat sealing.
  • the film is provided on its underside with a plastic layer and is punched out of a wide film web.
  • the film is then trapped above the Opening, which is also referred to as a central recess, placed and pressed under heat at the edge of the enclosed opening, so that the film is sealed to the lid blank by melting and subsequent cooling of the plastic layer.
  • the film is provided in a further processing station with an embossing and now located below the film inner edge of the lid blank is flanged.
  • the now finished covers are subjected to a test in a test station, which includes a density test for the applied film on the lid.
  • the film can be sealed or glued to the cover ring by partially performed in a first step, the bonding or sealing and completed in a second step, with this second step, the connection between the film and cover blank is strengthened overall.
  • the gluing seal is done by heat.
  • the partial bonding and sealing is produced in that the bonding or sealing takes place only in predetermined partial areas and / or is not completely formed by the lack of heat.
  • the temperature during bonding or sealing is preferably approximately 200 ° C. in the first step and / or in the second step.
  • an inductor which typically comprises a U-shaped magnetic core with two legs, with an electrically conductive coil wound around each leg to which an electrical power source connected.
  • the wound with the coils legs of the U-shaped magnetic core represent the poles.
  • the inductor forms an open magnetic circuit.
  • the poles are held close to the surface of the workpiece to be heated.
  • alternating current fed in a magnetic alternating field is created under whose influence high-frequency eddy currents are generated on the surface of the workpiece, so that heat is generated in the form of eddy current losses (so-called skin effect).
  • an induction heating unit by means of which electrical energy can be induced in the metallic periphery of a metal foil carrier of a lid for a container, so that the lid is heated and heat-bonded to the container.
  • the induction heating unit has a magnetic core with two oppositely arranged U-shaped sections, wherein a coil is arranged within a section.
  • the lid is clamped, while there is an air gap between the opposite legs of the other side.
  • the cover, the two legs of the one pole or the one side of the magnetic core with each other connects, so to speak, the magnetic field between the two poles of the magnetic circuit short.
  • the known devices for inductive heating which are also referred to as inductors, are supplied with high-frequency energy and typically a separate inductor with suitable dimensions is required for each workpiece of a certain dimension. Even different materials often require a different type of inductor, as is the case, for example, with workpieces made of aluminum compared to workpieces made of a steel alloy, since this material has a particularly strong influence on the coupling. If the inductor is to be used in a device with a conveying device, then it can occur in the known inductors that the typically metallic guides come into operative connection with an inductor arranged close to the workpiece and are likewise heated.
  • a workpiece formed in the form of a closed loop is meant a workpiece having an enclosed opening, ie an opening completely surrounded by a rim, such as annular or elliptical, square or rectangular workpieces an enclosed opening, which is for example circular, elliptical, square or rectangular, have.
  • Such workpieces are, for example, as lid blanks for the production of lids, which are provided with a film, in particular a tear-open film or a release liner, ie with a film which has a tab for tearing or peeling wherein the film as described above can be applied to the lid blank by sealing or gluing.
  • the object is achieved by an apparatus for inductive heating with the features of claim 1 and by a method for inductive heating with the feature of claim 10.
  • the inventive device for inductive heating can also be referred to as an inductor.
  • the inventive device for inductive heating comprises a U-shaped magnetic core with two legs, wherein at least one electrically conductive coil is arranged on at least one leg of the U-shaped magnetic core, which is connectable to an AC power source and which in particular surrounds the leg.
  • the device according to the invention is characterized in that a magnetic yoke is provided, which is arranged at a distance from at least one freestanding end of a leg of the U-shaped magnet core, so that a closed magnetic circuit is formed with at least one air gap.
  • the height of at least one air gap preferably both air gaps, is selected such that an electrically conductive workpiece can be performed without contact through the air gap.
  • the magnetic core may in particular be a ferrite core.
  • At least one electrically conductive coil is arranged on each leg of the U-shaped magnetic core, wherein the coils are wound in opposite directions and can be connected to an AC power source. Further, the magnetic yoke is spaced from the free-standing ends of both legs of the U-shaped magnetic core, so that a closed magnetic circuit is formed with two air gaps.
  • the area or cross-sectional area of at least the leg, to which the at least one air gap through which the electrically conductive workpiece is passable is preferably designed such that it fits into the opening enclosed by the electrically conductive workpiece. In this way it is achieved that the workpiece can be positioned in the air gap such that it projects beyond the air gap on all sides, i. surrounds the air gap. The workpiece is thus in inductive heating so outside the air gap and thus outside a zone of high magnetic field strength.
  • the inventive method is characterized by the fact that in an inventive device, an electrically conductive workpiece is introduced in the form of a closed loop without contact in the air gap, so that the workpiece surrounds the air gap and an enclosed by the workpiece opening is at least partially in the air gap and that the Coils of the inventive device are supplied with an alternating current, ie be connected to an AC power source.
  • the enumeration of the steps of the method according to the invention should in this case not represent a chronological order, so that the coils are preferably also supplied with an alternating current even before the tool is introduced into the air gap.
  • the device according to the invention is preferably operated in continuous operation, so that the coils of the device according to the invention are permanently supplied with alternating current. In this way, a difficult control and a settling delay of the device according to the invention can be avoided.
  • the workpiece or its edges are then at least partially exposed to the prevailing in the air gap alternating field when introduced into the air gap, which is negligible at correspondingly small cycle times.
  • the method according to the invention and the device according to the invention can be used particularly advantageously for heating flat workpieces, wherein a flat workpiece also means a thin workpiece.
  • the device according to the invention and the method according to the invention are advantageously suitable for penetrating a workpiece which also encloses the air gap over a wide distance.
  • the AC power source may also be referred to as a generator. It is preferably a low-frequency and thus inexpensive AC source used. Furthermore, the use of a low frequency has the advantage that the coil losses are smaller and long leads can be used. That a low frequency can be used as the operating frequency is made possible in particular by the fact that the method according to the invention and the device according to the invention are essentially not based on the skin effect.
  • the device according to the invention is preferably operated at a relatively low frequency, which is preferably between 18 and 40 kilohertz, makes it possible to position and operate the device even at a greater distance from the AC power source without using a transformer, for example at a distance of 20 meters ,
  • U ind is the induction voltage
  • ⁇ magn is the magnetic flux
  • t is the time
  • B is the flux density
  • A is the area traversed by the magnetic field and enclosed by the workpiece as a constant
  • f is the area as a variable.
  • the magnetic flux ⁇ magn is assumed to change with time t. In the given equation, the winding number or number of turns of the coils is already taken into account in the magnetic flux or included.
  • the electrical resistance which may also be referred to as impedance or alternating current resistance, of the electrically conductive workpiece in the form of a loop is greater than zero, so that an induction voltage is induced.
  • the electrical resistance is also referred to as ring impedance.
  • the electrical resistance results in an electric current in the workpiece, which leads to a uniform or homogeneous heating or heating of the workpiece.
  • the heat generation in the workpiece is essentially not effected by skin effects on a surface of the workpiece or by re-magnetization losses.
  • workpieces of different dimensions or size which surround the air gap can be heated uniformly and substantially independently of the distance between the device or its air gap and the workpiece when the workpiece surrounds the air gap.
  • the same device according to the invention can be used for workpieces of different dimensions.
  • the geometry of the inventive Device or of the magnetic alternating field generated by the inventive device does not have to be adapted to the workpiece, as long as the workpiece encloses the air gap.
  • the device according to the invention can be used for example for heating a lid blank with an enclosed opening, in particular in or in a system for producing lids provided with a foil.
  • a plant typically has a conveyor / transport system or system for conveying and guiding lid blanks and various processing stations for processing the lid blanks (see WO 2006/042426 A1 as described above) and is designed as a continuous system.
  • the method according to the invention can be used for heating a lid blank having an enclosed opening, in particular in or in a system for producing covers with foils.
  • the device according to the invention can be formed essentially independently of the workpiece shape and size-apart from the size and the dimensions of the enclosed opening-the device according to the invention can be designed such that it does not interfere with the conveying device and / or the processing stations of a construction space Plant for the production of foil-providing lids comes into conflict. Since a closed magnetic circuit with two air gaps is formed by the device according to the invention, resulting in a substantially closed leadership of the magnetic field, spurious emissions are minimized and the conveyor is only exposed to a very weak magnetic field, so that heating of the conveyor practically avoided or can be neglected.
  • a blank lid before sealing or Bonding with a film advantageously by means of the inventive device and the inventive method heated in the context of preheating.
  • the film is then applied to the workpiece such that the enclosed opening of the workpiece is sealed by the film, preferably a pre-seal / pre-bond step and the pre-seal / pre-bond step, a master seal / bond step follow (cf. WO 2006/053457 A2 ).
  • inductive heating for example, annular or rectangular workpieces with an enclosed opening made of a steel alloy or aluminum in a system for producing lids with films, which has a conveyor, are heated in a few hundred milliseconds contactless by about 80 ° C uniformly.
  • the sealing / gluing, both the pre-seal / -verklebung and the main sealing / gluing then preferably carried out at about 200 ° C.
  • FIGS. 1 and 2 show an inventive device 1, in which an electrically conductive, exemplary annular workpiece 2 is introduced.
  • the workpiece 2 may also have another shape, for example a rectangular shape with an enclosed opening.
  • the device 1 comprises a U-shaped magnetic core 3.
  • a U-shaped magnetic core 3 is also understood to mean a C-shaped magnetic core.
  • the magnetic core 3 may comprise as material N87.
  • the magnetic core 3 is made of the material N87.
  • a coil 5 is applied in each case, wherein the coils 5 are wound in opposite directions. This is in the FIG. 1 clearly symbolized by the cross symbols and the dot symbols in the coils 5, wherein the point symbol symbolizes in a current flowing through a coil 5 out of the viewing plane, on the viewer stream and the cross symbol flowing into the viewing plane stream.
  • Each coil 5 is preferably formed by a high-frequency strand with a predetermined single strand arrangement comprising at least 500 individual strands, more preferably 1000 individual strands. Each coil 5 preferably has 14 turns.
  • the device 1 further comprises a magnetic yoke 6 (not shown in FIG FIG. 2 ), with the formation of air gaps 7 at a distance from the not closer designated, free-standing ends of the legs 4 of the U-shaped magnetic core 3 is arranged.
  • the height of the air gaps 7 is selected such that the workpiece 2 can be positioned through an air gap 7 and thus can be positioned in the vertical direction between the magnetic core 3 and the magnet yoke 6.
  • the air gaps 7 preferably have a height of 6.5 millimeters.
  • the device 1 according to the invention thus forms a closed magnetic circuit with two air gaps 7.
  • the yoke 6 is preferably formed I-shaped. However, it may also be U-shaped, this also a C-shaped configuration is understood. In a U-shaped configuration, not shown, the free-standing ends of the legs of the magnetic yoke 6 in the direction of the free-standing ends of the legs 4 of the magnetic core 3, wherein the legs of the magnetic yoke 6 spaced to form the air gaps 7 opposite to the free-standing ends of the legs 4 of the magnetic core 3 are arranged. In particular, if only one air gap 7 is provided, the magnetic yoke 7 may also be L-shaped.
  • the magnetic core 3 and the coils 5 are preferably encapsulated with an electrically insulating potting compound to mechanically and chemically protect the magnetic core 3 with the coils 5.
  • the potting compound used is particularly heat-conducting, preferably having a minimum thermal conductivity of 0.6 W / (m ⁇ K).
  • the magnetic core 3 may be provided with a cooling, in particular with a water cooling (not shown).
  • a magnetic alternating field 8 Each of the legs 4, around which a coil 5 is wound, represents a pole of a magnetic circuit, wherein the polarity of the respective pole varies depending on the polarity of the alternating current.
  • FIG. 1 are exemplary field lines 8 indicated for the magnetic alternating field. In and near the air gaps 7 regions of high magnetic field intensity 9 arise.
  • the workpiece 2 is carried by an air gap 7 and positioned so that its enclosed opening 10 at least partially lies in the air gap 7 and the workpiece 2 itself surrounds the air gap 7, i. outside the air gap 7 is located.
  • a region 11 of the workpiece lies outside the device 1
  • a further region 12 lies in the horizontal direction between the two poles formed by the legs 4 wrapped with the coils 5 and in the vertical direction in the air gaps 7 between the magnetic core 3 and the magnet yoke 6 lies.
  • the further region 12 lies in an area of low field strength between the two poles of the magnetic core 3.
  • the workpiece 2 thus surrounds the alternating field guided in the magnetic core 3 and in the magnetic yoke 6 and a voltage is induced in the workpiece 2 by the alternating field, as described in the introduction, which is substantially independent of the dimensions of the enclosed opening 10 of the workpiece 2.
  • the device according to the invention is particularly suitable for flat workpieces 2, i. suitable for workpieces 2 with a small vertical extent. As a flat workpiece 2 and a thin workpiece is considered.
  • the inventive device 1 and the workpiece 2 basically correspond to a transformer with a very large air gap, wherein the device. 1 the primary winding and the workpiece 2 represent a short-circuited secondary winding of the transformer.
  • the alternating current source or the generator for supplying the coils 5 preferably generates a current with a low frequency, in particular with a frequency in the range of 18 to 40 kilohertz, wherein the alternating current source or the generator may have a switched resonant circuit.
  • the current generated by the AC source or generator preferably has a root mean square (rms) of about 10 to 25 amperes). If no workpiece 2 is introduced into the device 1, so that it is operated idle, this results in a decrease in the resonant frequency of the device 1, which is preferably connected to a capacitive AC power source, and the system of device 1 and not shown AC power source is automatically relieved.
  • the inventive device may be provided in addition to the first U-shaped magnetic core 3, a second U-shaped magnetic core, wherein the legs 4 of the first U-shaped magnetic core 3 associated coils 5 now also the legs of the other , second U-shaped magnetic core are assigned.
  • the coils 5 surround in this embodiment, the legs of both U-shaped magnetic cores.
  • the further, second U-shaped magnetic core preferably has the same dimensions as the first U-shaped magnetic core, in the in connection with the FIGS. 1 and 2 described embodiment 1 of the inventive device is provided.
  • the other, second U-shaped magnetic core is also a magnetic yoke, which may be configured I-shaped or U-shaped, assigned, said second magnetic yoke in addition to the first magnetic yoke 6 in the FIGS.
  • the inventive device 1 and 2 1 embodiment of the inventive device is arranged, so that air gaps with a larger cross-section than in the inventive Device 1 with only one magnetic core 3 and only one magnetic yoke 6.
  • the first magnetic yoke 6 may also be formed so broad that it fits over both magnetic cores or forms the air gaps with two magnetic cores.
  • 1 and 2 illustrated embodiment of the inventive device results in a number of turns / winding number of 9 or 10 per coil.
  • the number of turns / number of turns required copper losses are advantageously reduced (the coils typically comprise copper as the material), and the saturation effect of the magnetic core can be greatly reduced, so that the device according to the invention has lower heat losses. Because of the lower losses in the magnetic cores can be worked with a higher field strength of the alternating magnetic field.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Furnace Details (AREA)
EP08010441A 2007-09-21 2008-06-09 Dispositif et procédé destinés au réchauffement inductif d'une pièce à usiner conductrice électriquement Active EP2040512B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH14722007 2007-09-21

Publications (3)

Publication Number Publication Date
EP2040512A2 true EP2040512A2 (fr) 2009-03-25
EP2040512A3 EP2040512A3 (fr) 2009-11-04
EP2040512B1 EP2040512B1 (fr) 2010-08-11

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EP08010441A Active EP2040512B1 (fr) 2007-09-21 2008-06-09 Dispositif et procédé destinés au réchauffement inductif d'une pièce à usiner conductrice électriquement

Country Status (7)

Country Link
US (1) US9055616B2 (fr)
EP (1) EP2040512B1 (fr)
AT (1) ATE477701T1 (fr)
DE (1) DE502008001112D1 (fr)
ES (1) ES2347723T3 (fr)
PT (1) PT2040512E (fr)
TW (1) TWI454184B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2387863B1 (fr) * 2009-01-17 2015-07-22 Inductoheat, Inc. Traitement thermique par induction de pièces de forme complexe
CN111315055B (zh) * 2020-02-17 2022-02-01 中国科学院电工研究所 一种基于分裂式铁芯的混合磁路超导感应加热装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4740663A (en) 1987-01-02 1988-04-26 Continental Can Company, Inc. Transverse flux induction heating unit
US5101086A (en) 1990-10-25 1992-03-31 Hydro-Quebec Electromagnetic inductor with ferrite core for heating electrically conducting material
US5690851A (en) 1994-10-07 1997-11-25 Spc Electronics Corp. Induction heating apparatus for drink can
US7022951B2 (en) 2002-11-18 2006-04-04 Comaintel, Inc. Induction heating work coil
WO2006042426A1 (fr) 2004-10-19 2006-04-27 Soudronic Ag Procede et dispositif pour tester l'etancheite de couvercles a ouverture facile
WO2006053457A2 (fr) 2004-11-19 2006-05-26 Soudronic Ag Machine a sceller

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Publication number Priority date Publication date Assignee Title
DE1097059B (de) * 1959-10-12 1961-01-12 Kugelfischer G Schaefer & Co Verfahren zum elektrisch-induktiven Erwaermen von Metallringen
JPS5844556Y2 (ja) * 1979-11-05 1983-10-08 有限会社パルス技研 ベアリングその他リングの内径部の加熱装置
US4311896A (en) * 1979-06-04 1982-01-19 Yugen Kaisha Parusu Giken Heating apparatus for annular bearings and rings
FR2661849B1 (fr) * 1990-05-10 1995-03-17 Siderurgie Fse Inst Rech Procede et dispositifs de rechauffage par induction au defile d'un produit metallurgique de forme allongee.
US5444220A (en) * 1991-10-18 1995-08-22 The Boeing Company Asymmetric induction work coil for thermoplastic welding
JPH1092561A (ja) * 1996-09-19 1998-04-10 Kitashiba Denki Kk 誘導加熱装置
JPH11219778A (ja) * 1998-01-30 1999-08-10 Sumitomo Rubber Ind Ltd 誘導加熱装置
JP2001189222A (ja) 1999-12-28 2001-07-10 Sharp Corp マグネトロン用インバータ回路のトランス
US7034263B2 (en) * 2003-07-02 2006-04-25 Itherm Technologies, Lp Apparatus and method for inductive heating
AU2005239590B2 (en) * 2004-04-21 2011-03-03 Inductoheat, Inc. Multi-frequency heat treatment of a workpiece by induction heating
US20060254709A1 (en) * 2005-05-11 2006-11-16 Bone Marvin J Jr Flux guide induction heating method of curing adhesive to bond sheet pieces together

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4740663A (en) 1987-01-02 1988-04-26 Continental Can Company, Inc. Transverse flux induction heating unit
US5101086A (en) 1990-10-25 1992-03-31 Hydro-Quebec Electromagnetic inductor with ferrite core for heating electrically conducting material
US5690851A (en) 1994-10-07 1997-11-25 Spc Electronics Corp. Induction heating apparatus for drink can
US7022951B2 (en) 2002-11-18 2006-04-04 Comaintel, Inc. Induction heating work coil
WO2006042426A1 (fr) 2004-10-19 2006-04-27 Soudronic Ag Procede et dispositif pour tester l'etancheite de couvercles a ouverture facile
WO2006053457A2 (fr) 2004-11-19 2006-05-26 Soudronic Ag Machine a sceller

Also Published As

Publication number Publication date
EP2040512A3 (fr) 2009-11-04
TWI454184B (zh) 2014-09-21
DE502008001112D1 (de) 2010-09-23
US20090078697A1 (en) 2009-03-26
PT2040512E (pt) 2010-10-27
ES2347723T3 (es) 2010-11-03
EP2040512B1 (fr) 2010-08-11
US9055616B2 (en) 2015-06-09
ATE477701T1 (de) 2010-08-15
TW200926903A (en) 2009-06-16

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