WO1988009106A1 - Method and device for heating a workpiece - Google Patents
Method and device for heating a workpiece Download PDFInfo
- Publication number
- WO1988009106A1 WO1988009106A1 PCT/SE1988/000237 SE8800237W WO8809106A1 WO 1988009106 A1 WO1988009106 A1 WO 1988009106A1 SE 8800237 W SE8800237 W SE 8800237W WO 8809106 A1 WO8809106 A1 WO 8809106A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- workpiece
- core
- heating
- coil
- magnetic field
- Prior art date
Links
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
- H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
Definitions
- the present invention relates to methods and devices for magnetically heating a workpiece consist ⁇ ing at least partly of metal. More specifically, the invention is concerned with the preheating of moulding or press tools, the separation of metal from a polymer, the production of composite materials, and the hardening of adhesive, between two metal members.
- DE 2,900,655 indicates a different technique involving the use of an induction coil.
- An object for example a vehicle tire, is positioned within the induction coil which is activated by a high-frequency voltage to generate a magnetic field heating the metal in the vehicle tire to such an extent that the polymer can be detached from the metal.
- Gene ⁇ rating high-frequency voltage is expensive and cannot be utilised for all types of objects.
- the object has projecting metal parts, a so-called point effect is obtained which means that the projecting metal part is heated to red heat.
- the high- frequency technique is restricted to relatively thin objects since the penetration depth in metal is slight when use is made of high frequency, for example 1 to 16 kHz.
- a first object of the invention is to achieve rapid and uniform heating of a workpiece, without having to rely on the shape and thickness of the ob ⁇ ject for the desired result.
- a second object of the invention is to provide an inexpensive and uncomplicated heating device adapted to utilise the existing electric mains.
- a third object is to provide a device which, -. upon separation, gives clean and faultless final pro ⁇ ducts, i.e. metal parts which are clean from polymeric material and which have not been affected by struc ⁇ tural changes and stress, as well as polymeric material which is not heated to temperatures at which it is destroyed, the final products being reusable.
- a fourth object of the invention is to provide an energy-saving heating method by which the losses are " restricted to the heat developed in the coils, and to losses in the core.
- Fig. 1 shows a first embodiment of the invention, in which a movable core pole is displaced upwardly to produce an air gap adapted to accommodate a work- piece.
- Fig. 2 shows a second embodiment in which the workpiece is a secondary winding of the circuit.
- Fig. 3 shows a third embodiment adapted to se ⁇ parate polymeric material from a metal container or the like.
- Fig. 1 illustrates a core 1 of transformer sheet steel.
- the core has a stationary pole 2 and a movable pole 3.
- the pole 3 is movable into engagement with the pole 2 to form a short-circuited core.
- the movable pole 3 is displaced upwardly to form an air gap between itself and the stationary core 2.
- a first coil 4 is positioned around the movable pole, and a second coil 5 is posi ⁇ tioned around the stationary pole.
- a third coil 6 is positioned around the air gap between the first and the second coil.
- the coils 4, 5 and 6 are connected in series via lines 9, 10, 11 and 12 and connected to an alternating voltage source 7 which is a single- phase source utilising the zero conductor of the elec ⁇ tric mains and gives, for example, 220 V at 50 Hz. Naturally, also two or three phases may be utilised. In one of its aspects, the invention aims at providing adequate heating by means of the normal mains voltage and frequency.
- the poles 2 and 3 have been designed to retain the workpiece during heating, and therefore there is no need of special means for holding the workpiece during heating.
- the workpiece consists of metal coated with a polymeric material, such as rubber.
- the workpiece may also be a press or moulding tool.
- the workpiece extends beyond the core, but also smaller workpieces of a width below the cross-sectional area of the core can be heated in a device according to the invention.
- a device is a ball bearing.
- the workpiece may have at least one metal portion bridging the air gap and short-circuit ⁇ ing the core 1.
- the device is operable also if short- circuiting is prevented by a layer of polymeric mate ⁇ rial on the workpiece. It should be noted, however, that the losses increase with the thickness of the said layer.
- the coils Upon application of a voltage, the coils generate a magnetic field which is conducted in the circuit formed by the core 1 and the workpiece 8 and also occurs outside the core.
- the magnetic field conducted in the core passes through the central metal portion of the workpiece 8 and heats it.
- the magnetic field outside the core will heat the peripheral metal por ⁇ tions of the workpiece by induction.
- the frequency can be varied in dependence on the thickness of the workpiece. If a penetration depth of about 2 cm is desired, the frequency is set at about 25 Hz. For heating thin-walled workpieces, the frequency may be for example 2.00 Hz.
- the coils are connected in series, but can also be connected in parallel, provided that their magnetic fields cooperate to " heat the- orkpiece.
- At least the first coil 4 can be raised and lowered to control the heating of the workpiece.
- a microproces ⁇ sor is preferably used for controlling the movement of the coil 4 and the movable pole 3. If desired, also the remaining coils can be made vertically mov ⁇ able.
- the coil 6 may be omitted, and then the magnetic field generated by the coils 4 and 5 is sufficient to heat both the peripheral portions and the central portion of the workpiece. On the other hand, the coil 6 assists in concentrating the magnetic field outside the core to the workpiece peripheral portions.
- Heating a workpiece to 450°C in a conventional hot-air furnace would take .10 hours, but with the new technique according to the present invention the heating takes but a fraction of this time, for example 15 min.
- the new technique gives a temperature which differs by not more than +5°C throughout the cross- t sectional area of the workpiece.
- a workpiece in the form of a ring '>' 5 13 is heated.
- the movable pole 3 has been lowered to engage the-stationary pole 2.
- an electric current is produced in the workpiece 13 which assists in heat ⁇ ing the workpiece.
- the magnetic field from the coils 4, 5 and 6 induces heat within the workpiece.
- Fig. 3 shows a device for removing polymeric material from a large workpiece, such as a metal tank.
- the device comprises a U core 14, the legs of which 15 are provided each with one coil 17 and 18, respective ⁇ ly.
- the coils are connected in series by means of lines 19, 20 and 21 and connected to a voltage source 7 of the type mentioned above.
- the device is applied to the tank 22, and the magnetic field generated upon 20 activation of the coils is conducted through the U core 14 and the tank region between the legs 15 and 16 which is heated to the desired temperature by con ⁇ trolling the applied voltage, the frequency and the time during which voltage is applied.
- the region 25 has been. eated, the device is moved to another region of the tank, and the polymeric material of the area first heated simply is peeled off.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8701888-3 | 1987-05-07 | ||
SE8701888A SE8701888D0 (en) | 1987-05-07 | 1987-05-07 | SEPARATION PROCESS 3 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1988009106A1 true WO1988009106A1 (en) | 1988-11-17 |
Family
ID=20368449
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1988/000237 WO1988009106A1 (en) | 1987-05-07 | 1988-05-06 | Method and device for heating a workpiece |
Country Status (5)
Country | Link |
---|---|
US (1) | US5023419A (en) |
EP (1) | EP0364472A1 (en) |
AU (1) | AU1782788A (en) |
SE (1) | SE8701888D0 (en) |
WO (1) | WO1988009106A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997026776A1 (en) * | 1996-01-16 | 1997-07-24 | Linlan Induction Ab | Device for heating a press tool, press having such device, and method of manufacture |
GB2366572A (en) * | 2000-06-07 | 2002-03-13 | Honda Motor Co Ltd | A method and tool for hardening a workpiece with a hole |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5310975A (en) * | 1992-12-23 | 1994-05-10 | General Electric Company | Method and apparatus for the continuous field annealing of amorphous metal transformer cores |
AU7342298A (en) * | 1997-05-13 | 1998-12-08 | Coreflux Systems International Limited | Induction heating device for metal pieces |
US6282785B1 (en) | 1999-06-28 | 2001-09-04 | Ford Global Technologies, Inc. | Torque converter blades brazed to a housing using a magnetic heating process |
US6217677B1 (en) | 1999-06-28 | 2001-04-17 | Ford Global Technologies, Inc. | Method for annealing stamped components |
DE19937493C2 (en) * | 1999-08-07 | 2001-06-07 | Mfh Hyperthermiesysteme Gmbh | Magnetic field applicator for heating magnetic or magnetizable substances or solids in biological tissue |
WO2001098078A1 (en) * | 2000-06-23 | 2001-12-27 | Glaverbel | Glazing |
US6797066B2 (en) * | 2000-10-24 | 2004-09-28 | Kabushiki Kaisya Yoshino Kosakujo | Apparatus and method for powder coating |
JP3916969B2 (en) * | 2001-07-02 | 2007-05-23 | 株式会社神戸製鋼所 | Raw tire preheating method and apparatus |
SE525471C2 (en) * | 2002-06-05 | 2005-03-01 | Inline Hardening Sweden Ab | heating device |
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 |
US7459053B2 (en) * | 2005-05-11 | 2008-12-02 | Bone Jr Marvin J | Flux guide induction heating device and method of inductively heating elongated and nonuniform workpieces |
CN103180117A (en) * | 2010-11-04 | 2013-06-26 | 3M创新有限公司 | Method of forming filter elements |
EP4100553A4 (en) | 2020-02-05 | 2024-07-17 | Inductoheat Inc | Split multiple coil electric induction heat treatment systems for simultaneous heating of multiple features of a bearing component |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1725465A (en) * | 1927-12-08 | 1929-08-20 | Manson George James | Method of and apparatus for drying pulp articles |
US3187155A (en) * | 1959-10-12 | 1965-06-01 | Kugelfischer G Schaefer & Co | Method of heating annular metallic bodies by electrical induction |
DE2322129B2 (en) * | 1972-05-02 | 1978-08-17 | Mitsubishi Denki K.K., Tokio | Induction cooker |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1533081B1 (en) * | 1966-02-15 | 1971-01-21 | Leybold Heraeus Gmbh & Co Kg | Coreless induction furnace for melting and stirring metals and procedures for operating this furnace |
US3467806A (en) * | 1968-04-25 | 1969-09-16 | Westinghouse Electric Corp | Induction heating device |
DE2900655A1 (en) * | 1979-01-10 | 1980-07-17 | Phoenix Ag | Discarded steel cord tyre processing - by induction heating of wires before crushing to powder for sepn. |
US4311896A (en) * | 1979-06-04 | 1982-01-19 | Yugen Kaisha Parusu Giken | Heating apparatus for annular bearings and rings |
SU849560A1 (en) * | 1979-10-02 | 1981-07-23 | Украинский Заочный Политехническийинститут | Induction heater for heating annular shape articles |
SU924920A1 (en) * | 1980-10-10 | 1982-04-30 | Павлодарский Проектно-Конструкторский Технологический Институт Автоматизации И Механизации | Device for induction heating of ring parts |
FR2593345B1 (en) * | 1986-01-21 | 1988-03-04 | Alsthom | ARTICULATED ARMATURE DEVICE FOR INDUCTIVE PARKING HEATING |
FR2608347B1 (en) * | 1986-12-11 | 1989-02-24 | Siderurgie Fse Inst Rech | INDUCTOR FOR INDUCTIVE HEATING OF METALLURGICAL PRODUCTS |
-
1987
- 1987-05-07 SE SE8701888A patent/SE8701888D0/en unknown
-
1988
- 1988-05-05 US US07/435,383 patent/US5023419A/en not_active Expired - Fee Related
- 1988-05-06 AU AU17827/88A patent/AU1782788A/en not_active Abandoned
- 1988-05-06 WO PCT/SE1988/000237 patent/WO1988009106A1/en not_active Application Discontinuation
- 1988-05-06 EP EP88904693A patent/EP0364472A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1725465A (en) * | 1927-12-08 | 1929-08-20 | Manson George James | Method of and apparatus for drying pulp articles |
US3187155A (en) * | 1959-10-12 | 1965-06-01 | Kugelfischer G Schaefer & Co | Method of heating annular metallic bodies by electrical induction |
DE2322129B2 (en) * | 1972-05-02 | 1978-08-17 | Mitsubishi Denki K.K., Tokio | Induction cooker |
Non-Patent Citations (2)
Title |
---|
DERWENT'S ABSTRACT No 22295 K/09, SU 924 920, (Pavlodar Autom Mech) * |
DERWENT'S ABSTRACT No 41052 E/20, SU 849 560, (Ukr Corresp Poly) * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997026776A1 (en) * | 1996-01-16 | 1997-07-24 | Linlan Induction Ab | Device for heating a press tool, press having such device, and method of manufacture |
GB2366572A (en) * | 2000-06-07 | 2002-03-13 | Honda Motor Co Ltd | A method and tool for hardening a workpiece with a hole |
GB2366572B (en) * | 2000-06-07 | 2003-01-08 | Honda Motor Co Ltd | Method of hardening workpiece with hole, and assistive tool for use therein |
US6648995B2 (en) | 2000-06-07 | 2003-11-18 | Honda Giken Kogyo Kabushiki Kaisha | Method of quenching workpiece with hole, assistive tool for use in quenching, and crankshaft |
Also Published As
Publication number | Publication date |
---|---|
EP0364472A1 (en) | 1990-04-25 |
SE8701888D0 (en) | 1987-05-07 |
US5023419A (en) | 1991-06-11 |
AU1782788A (en) | 1988-12-06 |
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