EP0129160A2 - Durchlaufwärmeanlage für metallische Produkte mittels Induktion - Google Patents
Durchlaufwärmeanlage für metallische Produkte mittels Induktion Download PDFInfo
- Publication number
- EP0129160A2 EP0129160A2 EP84106525A EP84106525A EP0129160A2 EP 0129160 A2 EP0129160 A2 EP 0129160A2 EP 84106525 A EP84106525 A EP 84106525A EP 84106525 A EP84106525 A EP 84106525A EP 0129160 A2 EP0129160 A2 EP 0129160A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic
- product
- heated
- roller
- stack
- 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
Links
- 238000010438 heat treatment Methods 0.000 title claims description 27
- 230000005291 magnetic effect Effects 0.000 claims abstract description 97
- 230000004907 flux Effects 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 230000035699 permeability Effects 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 230000005294 ferromagnetic effect Effects 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 230000000593 degrading effect Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract description 9
- 230000005284 excitation Effects 0.000 abstract description 3
- 238000003475 lamination Methods 0.000 abstract description 2
- 238000004804 winding Methods 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000012447 hatching Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229940105847 calamine Drugs 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 229910052864 hemimorphite Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- CPYIZQLXMGRKSW-UHFFFAOYSA-N zinc;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+3].[Fe+3].[Zn+2] CPYIZQLXMGRKSW-UHFFFAOYSA-N 0.000 description 1
Images
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
- H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
- H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
Definitions
- the invention relates to a device for heating metal products by induction scrolling.
- a first known device comprises these elements and is described in American patent US-A-3008 026 (Kennedy).
- said magnetic stack of each transport roller is constituted by thick removable disks which can have various values of their magnetic permeabilities to allow obtaining a suitable distribution of the magenetic heating flux according to the width of the product to be heated.
- the transport rollers are arranged in pairs above and below the product to be heated and the magnetic discs are contact with this product.
- the inductor coils surround the transport rollers above and below the product to be heated to ensure a symmetrical distribution of the flow. These rollers are in contact with the latter to prevent any vertical displacement of this product, this latter under the action of magnetic forces created by the heating flow.
- this first known device is intended exclusively for heating a thin strip at a low temperature, probably always less than 500 ° C., even when this patent mentions heat treatment and forming among the possible applications of this. device.
- the heating power indeed appears low due to the arrangement of the coils and the fact that a high flux would raise the temperature of the magnetic discs above their Curie point, which would make them lose their magnetic permeability.
- Such a flow would also directly heat the shafts constituting the stiffening elements of these rollers, since such shafts are normally made of a steel having a substantial magnetic permeability and would therefore be traversed by this flow. The heating of these trees would make them lose part of their mechanical qualities.
- the present invention applies to the case where thick metallic products have to be heated or reheated to a high temperature, suitable for example to facilitate their subsequent deformation. It applies more particularly to the case where these products are long steel products, for example flat steel products which are still hot during rolling and which must be reheated to a temperature of the order of 1000 to 1200 ° C. to allow continue the rolling process under good conditions.
- the thickness of such a product can for example be between 25 and 250 mm approximately, and the power which must be dissipated to heat it between 10 and 200 W / cm 2 approximately and most often between 50 and 200 W / em 2 .
- the heating of such a product can be obtained by a flow passing through the smallest dimension or thickness of the flat product.
- this flux can be obtained by a periodic variation - for example sinusoidal - of an inductive current in fixed coils. It can also be obtained by the longitudinal or transverse displacement of the waves of a sliding field generated by a fixed polyphase inductor. It can also result from the periodic variation of reluctance of a magnetic circuit excited in direct current, or of the mechanical displacement of poles excited in direct current.
- the present invention aims to allow high temperature heating of metal products at the parade with increased power, using a simple device, easy maintenance, without increasing size and consuming no energy electric power only at a moderate frequency, for example at the frequency of the general supply network, that is to say 50 or 60 Hz.
- the sheets used to constitute the magnetic stack of the rollers are of the type which are conventionally used for laminated magnetic circuits and the thickness of which is usually 0.5 mm.
- the device also comprises stationary intermediate support slabs arranged in the intervals between the successive transport rollers to limit the downward bending of a product to be heated which is long and not very rigid, and these intermediate slabs comprise ferromagnetic blocks constituted by stacking, in the transverse direction, of magnetic sheets perpendicular to this direction to complete with the transport rollers said magnetic circuit looped under the product to be heated.
- each intermediate paving comprises separators of non-magnetic refractory steel distributed in said transverse direction and protruding above said ferromagnetic blocks to separate the product to be heated in order to thermally isolate it from these blocks.
- the invention allows the nesting of the transport means and the heating means without the one in any way hindering the implementation of the other, which eliminates the above drawbacks.
- recourse is had to rollers and possibly to intermediate slabs, the constitution of which is new, in particular with the use of laminating of magnetic sheets, and can be easily adapted to the particular operating conditions of a mechanical, magnetic and thermal.
- This makes it possible to apply to the products to be heated induction flows which do not have any discontinuity in the direction of transfer of these products.
- the invention thus allows the greatest possible linear powers and therefore provides great compactness to the heating members. It therefore facilitates economic insertion of heating devices in existing or future rolling installations in which the required heating powers can reach several tens of megawatts.
- FIG. 1 A first preferred embodiment of the invention is illustrated in FIG. 1.
- the product to be heated 1 is conveyed by rollers 2 and moves over intermediate slabs 3.
- Laminated magnetic circuits 4 form a longitudinal succession. They carry, housed in notches, inductor windings 5 generating the heating flows. These are stationary pulsed, that is to say fixed in space and variable in time at any point of the product.
- their winding is of the single-phase type distributed with nested heads and is supplied by terminals A and B in alternating current at industrial frequency (50 or 60 Hz).
- the inductors are protected from the thermal radiation of the heated product by a screen E, made of ceramic fiber about 5 cm thick for example.
- a screen E made of ceramic fiber about 5 cm thick for example.
- the rollers 2 and the intermediate slabs 3 are designed to have a high magnetic permeability while being the seat of losses by eddy currents and limited magnetic hysteresis and while retaining the mechanical aptitudes necessary for transporting the products to be heated.
- the rollers are produced by stacking on a rigid shaft 21, between two clamping flanges 22 and 23, of a series of separators made of refractory non-magnetic steel 24 and of laminated magnetic blocks 25.
- These blocks each consist of a stack of circular flat sheets. The insulation between sheets is obtained by oxidation of their surface.
- the stack of these blocks and these separators is clamped between the flanges 22 and 23 with tension of the shaft 21, which makes this stack participate in the overall rigidity of the roller.
- Each separator 24 has a circular support edge 24A coaxial with the roller and located radially beyond these blocks to maintain a radial gap of thermal insulation 24B between these blocks and the product to be heated supported by this support edge.
- the design of the rollers can be adapted to each operating case.
- the separators 24 can be made of more ordinary steels, or even be eliminated, and the magnetic circuits isolated by varnishing.
- This cooling can be obtained by watering booms. As shown in FIG.
- the intermediate slabs are produced by stacking non-magnetic refractory steel separators 31 and laminated magnetic blocks 32, the whole assembled and stiffened by the mechanically welded elements 33, 34 and 35.
- the series of rollers and intermediate slabs constitutes an almost continuous magnetic circuit.
- the air gaps separating the rollers and slabs can indeed have a thickness of the order of a centimeter, which does not significantly increase the reluctance of the total magnetic circuit, while practically avoiding any risk of blockage of the rollers by disturbing elements such as only pieces of scale.
- the purpose of this arrangement is that the main air gap (of the order of one or more decimeters) encountered by the flux of the inductor is that which is formed by the vertical thickness of the product, the air above it and the thermal protection of the inductor. It allows an easy channeling of the flows intended for heating and avoids, during the design of the inductors, having to be concerned with the presence of the rollers and slabs and their positions.
- the pitch of the inductors is greater than that of the rollers, but it could obviously be less than or equal to it.
- FIG. 1 represents an embodiment of inductors in modules of a pitch, or a pole, without this being a necessity but rather a convenience. It is always possible to make multipolar modules or all of the inductors in one block.
- the magnetic circuit 4 has a longitudinal succession of polar teeth 4X extending vertically, ending downward facing the product to be heated, and connected by their vertices, the inductor coils 5 inducing in these teeth a flux vertical variable magnetic.
- FIG. 8 shows, in a top view of the pavements, a graded embodiment of sheets 36 in the magnetic blocks of the pavements to provide between these blocks and the separators 31, a space through which the scale which forms on the heated product can evacuate or be evacuated by an external means. Other arrangements can of course allow this evacuation of scale.
- the product to be heated is for example constituted by a steel plate emerging from rolling mill cylinders.
- This dish is for example 40 mm thick, 1.6 m wide, and travels at a speed of 1 m / s. It reaches a temperature of 925 C and must be reheated to 1050 C, which requires dissipating within it a short distance a power of about 25 MW.
- the rollers are liquid cooled. They have a diameter of 400 mm, and their pitch of longitudinal succession is 950 mm
- the inductor comprises 10 elements which each induce a power of 2.5 MW, at 50 Hz. They each extend over a length of 1.25 m.
- the sheets of all the magnetic elements have a thickness of 0.5 mm and are isolated by oxidation according to the usual methods.
- the inductor leaves a free gap of 150 mm above the product to be heated. The bending of this product between rollers is not shown. It is limited to 20 mm by intermediate paving.
- the heated product goes to other rolling mill rolls to be brought to a thickness of 10 mm.
- pole coils 5B on cores supplied with alternating current. These coils are integrated with their magnetic circuits 4B in place of the corresponding elements of FIG. 1.
- the magnetic inductor circuit 4C can carry a polyphase winding 5C, for example three-phase as shown partially in FIG. 12.
- This winding creates a sliding field whose direction of movement A or B depends on the succession phases, this direction agreeing or being opposite with that C of the transport of the product to be heated.
- This magnetic circuit and its winding are integrated in place of the corresponding elements of FIG. 1.
- the winding can be performed with concentric heads instead of nested heads as shown in FIG. 12.
- the excitation coils 5D are carried by a magnetic cylinder 6 not necessarily laminated driven in rotation, the rest of the magnetic circuit of the inductor being shown in 4D.
- the excitation coils 5E are carried by poles 7 not necessarily laminated driven in rotation, the rest of the magnetic circuit of the inductor being shown in 4E.
- the coils are supplied with direct current. This avoids the reactive energy call existing in the previous modes.
- the variation of the heating flows with an appropriate frequency is obtained by the rotation in a cylindrical space formed in the magnetic circuit 4D or 4E with a very small air gap vis-à-vis the parts 6 or 7.
- the moving parts 6 or 7 are shown bipolar, but may include several pairs of poles.
- the pole coils 5F are supplied with direct current.
- the variation in flux is obtained by a cyclic variation in the reluctance of the entire magnetic circuit. This variation is caused by the rotation of a magnetic piece 8, laminated in the same direction as the rest of the circuit, and whose shape causes a notable variation in the air gap in which it moves and which is formed in the magnetic circuit. 4F.
- rollers, intermediate slabs and support for the roller bearings can be produced in different shapes or materials without departing from the scope of the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8309723 | 1983-06-13 | ||
FR8309723A FR2547402B1 (fr) | 1983-06-13 | 1983-06-13 | Dispositif de chauffage de produits metalliques au defile par induction |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0129160A2 true EP0129160A2 (de) | 1984-12-27 |
EP0129160A3 EP0129160A3 (en) | 1985-05-02 |
EP0129160B1 EP0129160B1 (de) | 1988-07-27 |
Family
ID=9289709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84106525A Expired EP0129160B1 (de) | 1983-06-13 | 1984-06-07 | Durchlaufwärmeanlage für metallische Produkte mittels Induktion |
Country Status (5)
Country | Link |
---|---|
US (1) | US4595813A (de) |
EP (1) | EP0129160B1 (de) |
JP (1) | JPS6010581A (de) |
DE (1) | DE3473110D1 (de) |
FR (1) | FR2547402B1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2601217A1 (fr) * | 1986-07-04 | 1988-01-08 | Siderurgie Fse Inst Rech | Dispositif d'entrainement et de guidage d'un produit metallique en bande soumis a une modification de temperature |
EP0438130A2 (de) * | 1990-01-17 | 1991-07-24 | Sumitomo Heavy Industries, Ltd | Elektromagnetisches Induktionsheizgerät |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004507870A (ja) * | 2000-08-29 | 2004-03-11 | オットー ユンカー ゲゼルシャフト ミット ベシュレンクテル ハフツング | 金属帯板を誘導加熱する装置 |
JP2002210510A (ja) * | 2001-01-15 | 2002-07-30 | Mitsubishi Heavy Ind Ltd | 圧延ロールの誘導加熱装置および誘導加熱方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3008026A (en) * | 1959-08-27 | 1961-11-07 | Ella D Kennedy | Induction heating of metal strip |
DE1182373B (de) * | 1963-05-30 | 1964-11-26 | Siemens Ag | Querfeld-Induktionsofen |
FR2306269A1 (fr) * | 1975-04-03 | 1976-10-29 | Uddeholms Ab | Appareil pour le chauffage par induction en continu de bandes metalliques en mouvement, avec dispositif combine de chauffage et de guidage a un poste de traitement |
FR2473244A1 (fr) * | 1980-01-04 | 1981-07-10 | Cem Comp Electro Mec | Procede et dispositif de chauffage electrique par induction de produits metalliques, utilisant des champs magnetiques pulses |
FR2495752A1 (fr) * | 1980-12-10 | 1982-06-11 | Siderurgie Fse Inst Rech | Dispositif de chauffage electrique par induction de produits electroconducteurs solides |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3489875A (en) * | 1966-10-27 | 1970-01-13 | Ajax Magnethermic Corp | Apparatus for induction heating of slabs |
US3471673A (en) * | 1968-02-19 | 1969-10-07 | United States Steel Corp | Apparatus for inductively heating a traveling metal slab |
US3715556A (en) * | 1970-10-05 | 1973-02-06 | Park Ohio Industries Inc | Slab heating method and apparatus |
FR2445085A1 (fr) * | 1978-12-22 | 1980-07-18 | Courdille Rene | Installation de chauffage par induction de produits metallurgiques plats |
-
1983
- 1983-06-13 FR FR8309723A patent/FR2547402B1/fr not_active Expired
-
1984
- 1984-06-07 DE DE8484106525T patent/DE3473110D1/de not_active Expired
- 1984-06-07 EP EP84106525A patent/EP0129160B1/de not_active Expired
- 1984-06-12 JP JP59120621A patent/JPS6010581A/ja active Granted
- 1984-06-13 US US06/620,210 patent/US4595813A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3008026A (en) * | 1959-08-27 | 1961-11-07 | Ella D Kennedy | Induction heating of metal strip |
DE1182373B (de) * | 1963-05-30 | 1964-11-26 | Siemens Ag | Querfeld-Induktionsofen |
FR2306269A1 (fr) * | 1975-04-03 | 1976-10-29 | Uddeholms Ab | Appareil pour le chauffage par induction en continu de bandes metalliques en mouvement, avec dispositif combine de chauffage et de guidage a un poste de traitement |
FR2473244A1 (fr) * | 1980-01-04 | 1981-07-10 | Cem Comp Electro Mec | Procede et dispositif de chauffage electrique par induction de produits metalliques, utilisant des champs magnetiques pulses |
FR2495752A1 (fr) * | 1980-12-10 | 1982-06-11 | Siderurgie Fse Inst Rech | Dispositif de chauffage electrique par induction de produits electroconducteurs solides |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2601217A1 (fr) * | 1986-07-04 | 1988-01-08 | Siderurgie Fse Inst Rech | Dispositif d'entrainement et de guidage d'un produit metallique en bande soumis a une modification de temperature |
EP0438130A2 (de) * | 1990-01-17 | 1991-07-24 | Sumitomo Heavy Industries, Ltd | Elektromagnetisches Induktionsheizgerät |
EP0438130A3 (en) * | 1990-01-17 | 1992-03-25 | Sumitomo Heavy Industries, Ltd | An electromagnetic induction heater |
US5157233A (en) * | 1990-01-17 | 1992-10-20 | Sumitomo Heavy Industries, Ltd. | Electromagnetic induction heater for heating a continuous thin sheet without undulation |
Also Published As
Publication number | Publication date |
---|---|
FR2547402A1 (fr) | 1984-12-14 |
EP0129160A3 (en) | 1985-05-02 |
JPS6010581A (ja) | 1985-01-19 |
US4595813A (en) | 1986-06-17 |
FR2547402B1 (fr) | 1988-08-12 |
DE3473110D1 (en) | 1988-09-01 |
JPS628910B2 (de) | 1987-02-25 |
EP0129160B1 (de) | 1988-07-27 |
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