SE520369C2 - Method and apparatus for partial heating of metal sheets - Google Patents
Method and apparatus for partial heating of metal sheetsInfo
- Publication number
- SE520369C2 SE520369C2 SE0004665A SE0004665A SE520369C2 SE 520369 C2 SE520369 C2 SE 520369C2 SE 0004665 A SE0004665 A SE 0004665A SE 0004665 A SE0004665 A SE 0004665A SE 520369 C2 SE520369 C2 SE 520369C2
- Authority
- SE
- Sweden
- Prior art keywords
- electrode
- metal plate
- heating
- metal
- electrodes
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/40—Direct resistance heating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2221/00—Treating localised areas of an article
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/62—Continuous furnaces for strip or wire with direct resistance heating
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Control Of Resistance Heating (AREA)
- Resistance Heating (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
. 520 369 lxJ Tack vare uppfinningen har man nu åstadkommit ett förfarande och en anordning som på ett utmärkt sätt fyller sitt syfte samtidigt som sättet är lätt att genomföra och anordningen enkel och billig att tillverka. Enligt uppfinningen användes en motstàndsuppvärm- ning, som utnyttjar minst en elektrod av kol, grafit eller icke metalliskt material med liknande egenskaper och som har låga friktionsvärden när elektroden eller elektroderna, då de är två till antalet och är monterade på var sin sida om metallplåten, förflyttas tryckt mot denna. Genom detta förfarande och denna anordning erhålles nu en uppvärmningsprocedur med stora fördelar jämfört med de tidigare kända metoder, som omnämnts ovan. När strömmen ansluts blir, i det fall två elektroder används, elek- trodspetsarna mycket varma, varigenom plåten uppvärms från båda sidor ända ut till yttersta skiktet, dvs. icke huvudsakligen i mitten, samtidigt som en motståndsuppvärmning av plåten erhålles när strömmen passerar. Enligt uppfinningen får man en mycket snabb uppvärmning och friktionen mellan metallplåtarna och elek- troderna är mycket låg samtidigt som en god precision på den uppvärmda zonens mått uppnås beroende på den snabbhet som pro- cessen kan genomföras på och genom att uppvärmningsprocessen kan riktas. Vidare finns en möjlighet att påverka uppvärmnings- förloppet genom att elektrodtrycket, matningshastigheten. och strömkarakteristiken är varierbar, varvid man får olika balans genonx motståndsuppvärmningen_ och. uppvärmningen från. de 'varma elektroderna. . Thanks to the invention, a method and a device have now been provided which in an excellent manner fulfill their purpose at the same time as the method is easy to carry out and the device is simple and inexpensive to manufacture. According to the invention, a resistance heater is used which utilizes at least one electrode of carbon, graphite or non-metallic material with similar properties and which has low friction values when the electrode or electrodes, when they are two in number and are mounted on each side of the metal plate, moved printed against it. By this method and this device, a heating procedure is now obtained with great advantages over the previously known methods, mentioned above. When the current is connected, in case two electrodes are used, the electrode tips become very hot, whereby the plate is heated from both sides all the way to the outermost layer, ie. not mainly in the middle, at the same time as a resistance heating of the plate is obtained when the current passes. According to the invention, a very rapid heating is obtained and the friction between the metal plates and the electrodes is very low while a good precision of the dimensions of the heated zone is achieved depending on the speed at which the process can be carried out and by directing the heating process. Furthermore, there is an opportunity to influence the heating process by the electrode pressure, the feed speed. and the current characteristics are variable, whereby a different balance is obtained genonx the resistance heating_ and. the heating from. the 'hot electrodes.
Uppfinningen beskrivs närmare nedan med hjälp av ett föredraget utföringsexempel.The invention is described in more detail below with the aid of a preferred embodiment.
Anordningen enligt uppfinningen är avsedd för partiell uppvärm- ning av metallplåtar för att åstadkomma partier, i vilka kommande plastisk formning skall genomföras och vilka metallplåtar dess- förinnan genom härdning eller kallbearbetning givits en förhöjd sträckgräns och därmed vanligen en försämrad duktilitet. Den kan vara uppbyggd på sådant sätt att densamma innefattar två mot varandra vända elektroder placerade på ett till tjockleken på den ,. ; u. u: f* I. , | n , u. -u I' _' ,, , f u :x .. - -- - y. metallplåt som skall uppvärmas reglerbart avstånd från varandra och vilka elektroder består av kol, grafit eller ett icke metal- liskt material med liknande egenskaper. Dessa elektroder har ett lågt friktionsvärde när dessa trycks mot metallplåten från var sitt håll samtidigt som elektroderna och metallplåten är för- flyttbara relativt varandra under uppvärmningsprocessen. Elek- troderna är monterade i elektriskt ledande elektrodhållare, som omsluter dessa, så att endast en mycket kort del av elektroderna sticker ut. Om kopparbelagda elektroder används kan en längre del av elektroden tillåtas sticka ut. Elektroddiametern kan variera från någon enstaka mm och uppåt och elektrodtrycket behöver ej vara mer än i storleksanordningen 1,5-15 N/nmfi. Elektroddiametern kan även vara olika på metallplåtens över- och undersida för att åstadkomma en osymmetrisk uppvärmning. Strömkällan kan utgöras av en enkel svetstransformator. Elektroderna kan, då de är två till antalet, vara placerade en på vardera sidan om metallplåten, så att strömmen kan passera från den ena elektroden till den andra via metallplåten. När strömmen anslutes blir elektrodspetsarna mycket varma och till och med glödande och värmer upp plåten från båda sidor, samtidigt som man får en symmetrisk motståndsupp- värmning av plåten när strömmen passerar.The device according to the invention is intended for partial heating of metal sheets in order to provide portions in which future plastic forming is to be carried out and in which metal sheets have previously been given an increased yield strength and thus usually a reduced ductility by hardening or cold working. It can be constructed in such a way that it comprises two facing electrodes placed on one to the thickness of it,. ; u. u: f * I., | n, u. -u I '_' ,,, fu: x .. - - - y. metal sheet to be heated adjustable distance from each other and which electrodes consist of carbon, graphite or a non-metallic material with similar properties . These electrodes have a low friction value when they are pressed against the metal plate from different directions at the same time as the electrodes and the metal plate are movable relative to each other during the heating process. The electrodes are mounted in electrically conductive electrode holders, which enclose them so that only a very short part of the electrodes protrudes. If copper-plated electrodes are used, a longer part of the electrode can be allowed to protrude. The electrode diameter can vary from a few mm and upwards and the electrode pressure need not be more than in the size device 1.5-15 N / nm fi. The electrode diameter can also be different on the upper and lower side of the metal plate to achieve an asymmetrical heating. The power source can be a simple welding transformer. When there are two electrodes in number, the electrodes can be placed one on each side of the metal plate, so that the current can pass from one electrode to the other via the metal plate. When the current is connected, the electrode tips become very hot and even glowing and heat the plate from both sides, at the same time as you get a symmetrical resistance heating of the plate when the current passes.
I det fall endast en elektrod. används sker 'värmningen från metallplåtens ena sida där strömmen går från denna elektrod till metallplåten, som i sig är jordad eller anligger mot en under- liggande jordad nætallplatta, 'varvid erhålles en1 mer ensidig uppvärmning, dvs. en icke symmetrisk uppvärming i tjockleksled, som är fallet med den utföringsform som utnyttjar två elektroder.In that case only one electrode. is used, the heating takes place from one side of the metal plate where the current goes from this electrode to the metal plate, which is itself earthed or abuts against an underlying earthed net metal plate, 'whereby a more one-sided heating is obtained, i.e. a non-symmetrical heating in the thickness joint, which is the case with the embodiment which uses two electrodes.
Claims (8)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0004665A SE520369C2 (en) | 2000-12-15 | 2000-12-15 | Method and apparatus for partial heating of metal sheets |
EP01271454A EP1341936B1 (en) | 2000-12-15 | 2001-11-29 | A method and a device for partial heating of metal sheets |
PCT/SE2001/002649 WO2002050316A1 (en) | 2000-12-15 | 2001-11-29 | A method and a device for partial heating of metal sheets |
DE60122206T DE60122206D1 (en) | 2000-12-15 | 2001-11-29 | A METHOD AND DEVICE FOR PARTIALLY HEATING METAL SHEETS |
AT01271454T ATE335858T1 (en) | 2000-12-15 | 2001-11-29 | A METHOD AND DEVICE FOR PARTIAL HEATING OF METAL SHEETS |
AU2002218615A AU2002218615A1 (en) | 2000-12-15 | 2001-11-29 | A method and a device for partial heating of metal sheets |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0004665A SE520369C2 (en) | 2000-12-15 | 2000-12-15 | Method and apparatus for partial heating of metal sheets |
Publications (3)
Publication Number | Publication Date |
---|---|
SE0004665D0 SE0004665D0 (en) | 2000-12-15 |
SE0004665L SE0004665L (en) | 2002-06-16 |
SE520369C2 true SE520369C2 (en) | 2003-07-01 |
Family
ID=20282260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE0004665A SE520369C2 (en) | 2000-12-15 | 2000-12-15 | Method and apparatus for partial heating of metal sheets |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1341936B1 (en) |
AT (1) | ATE335858T1 (en) |
AU (1) | AU2002218615A1 (en) |
DE (1) | DE60122206D1 (en) |
SE (1) | SE520369C2 (en) |
WO (1) | WO2002050316A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005018974B4 (en) * | 2004-04-29 | 2015-04-09 | Kuka Systems Gmbh | Method and device for heating electrically conductive uncoated or coated circuit boards |
AT500682B1 (en) * | 2004-04-29 | 2007-05-15 | Kuka Werkzeugbau Schwarzenberg | Process for heating electrically conducting coated and non-coated metallic plates for homogeneous endless workpieces comprises using electrical contact elements which are arranged on the plate for uniformly heating the material |
JP6142409B2 (en) | 2012-08-06 | 2017-06-07 | 高周波熱錬株式会社 | Electric heating method |
IT202000011635A1 (en) * | 2020-05-19 | 2021-11-19 | Metallurgica Luigi Pessina Acciai S P A | DEVICE FOR THE TRANSMISSION OF CURRENT IN A HEATING PROCESS |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1866538A (en) * | 1928-07-13 | 1932-07-12 | Smith Corp A O | Method of structurally modifying the surfaces of metal bodies |
JPS59105285A (en) * | 1982-12-07 | 1984-06-18 | 三菱電機株式会社 | Energization heating method |
JPH06172846A (en) * | 1992-12-08 | 1994-06-21 | Nippon Steel Corp | Carbon roll for conducting electricity |
JPH10317065A (en) * | 1997-05-20 | 1998-12-02 | Nippon Steel Corp | Method and device for energizing and heating plate like metallic material |
JP3921839B2 (en) * | 1998-01-12 | 2007-05-30 | マツダ株式会社 | ELECTRIC HEAT TREATMENT METHOD AND DEVICE, AND ELECTRODE HEAT TREAT |
IT1311691B1 (en) * | 1999-11-12 | 2002-03-19 | Petrelli Francesco Mancini | CONTINUOUS HEATING PROCEDURE OF METAL SEMI-FINISHED PRODUCTS BY DIRECT ELECTRIC CURRENT PASSAGE WITHIN THE SEMI-FINISHED PRODUCT BY |
-
2000
- 2000-12-15 SE SE0004665A patent/SE520369C2/en not_active IP Right Cessation
-
2001
- 2001-11-29 DE DE60122206T patent/DE60122206D1/en not_active Expired - Lifetime
- 2001-11-29 EP EP01271454A patent/EP1341936B1/en not_active Expired - Lifetime
- 2001-11-29 AU AU2002218615A patent/AU2002218615A1/en not_active Abandoned
- 2001-11-29 AT AT01271454T patent/ATE335858T1/en not_active IP Right Cessation
- 2001-11-29 WO PCT/SE2001/002649 patent/WO2002050316A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
EP1341936A1 (en) | 2003-09-10 |
ATE335858T1 (en) | 2006-09-15 |
WO2002050316A1 (en) | 2002-06-27 |
AU2002218615A1 (en) | 2002-07-01 |
DE60122206D1 (en) | 2006-09-21 |
SE0004665L (en) | 2002-06-16 |
SE0004665D0 (en) | 2000-12-15 |
EP1341936B1 (en) | 2006-08-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |