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EP0094378A2 - Dispositif de fusion comportant des électrodes consommables - Google Patents

Dispositif de fusion comportant des électrodes consommables Download PDF

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Publication number
EP0094378A2
EP0094378A2 EP83890082A EP83890082A EP0094378A2 EP 0094378 A2 EP0094378 A2 EP 0094378A2 EP 83890082 A EP83890082 A EP 83890082A EP 83890082 A EP83890082 A EP 83890082A EP 0094378 A2 EP0094378 A2 EP 0094378A2
Authority
EP
European Patent Office
Prior art keywords
electrode
lever
load cell
carriage
holder
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
EP83890082A
Other languages
German (de)
English (en)
Other versions
EP0094378A3 (en
EP0094378B1 (fr
Inventor
Peter Dipl.-Ing. Machner
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.)
Vereinigte Edelstahlwerke AG
Original Assignee
Vereinigte Edelstahlwerke 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
Application filed by Vereinigte Edelstahlwerke AG filed Critical Vereinigte Edelstahlwerke AG
Publication of EP0094378A2 publication Critical patent/EP0094378A2/fr
Publication of EP0094378A3 publication Critical patent/EP0094378A3/de
Application granted granted Critical
Publication of EP0094378B1 publication Critical patent/EP0094378B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/18—Electroslag remelting
    • 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
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/101—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc
    • H05B7/102—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc specially adapted for consumable electrodes

Definitions

  • the invention relates to a device for carrying out remelting processes with self-consuming electrodes, which device has a liftable and lowerable, with at least one load cell measuring device provided for determining the respective electrode weight with an electrode holder, via which the power supply line is led to the electrode .
  • the melting rate has a decisive influence on the block quality achieved, especially when vacuum arc remelting (referred to in the trade as VAR process). For this reason, the remelting speed in the VAR process is regulated by setting appropriate electrical parameters.
  • the constant reduction in weight of the electrode during remelting is used as the measurement variable for determining the melting rate.
  • the respective electrode weight is preferably determined by pressure load cells which are arranged in the region of the electrode feed rod.
  • pressure transducers are not a problem for the VAR process because, on the one hand, they can be positioned outside the thermally influenced zone or in an area without heat being influenced by the weld pool; on the other hand, due to the process, the feed rod must be welded centrally onto the electrode, thereby avoiding unbalance. Because the process works with direct current, no voltages are induced in the load cell, so that there are no problems with the power lines.
  • the arrangement of the pressure load cell is similar to the VAR process can only be used to a limited extent and with greater effort.
  • the reason for this can be the influence of heat by the slag bath and thus the heating of the parts of the system in which the pressure cell is installed, three measuring cells with compensation circuit devices usually being used for accurate electrode weighing when the electrode is not exactly vertical.
  • a further disadvantage of the arrangement of the pressure transducers near the clamping head of the electrode is the short distance to the cables or devices carrying the melt current.
  • the alternating magnetic field of the melt stream can, on the one hand, cause the pressure sensor to heat up to impermissibly high temperatures; on the other hand, there is the possibility that the measurement signal is falsified by the action of a magnetic field.
  • a device of the type mentioned at the outset has these disadvantages, as has become known, for example, from US Pat. No. 3,272,905.
  • the current supply to the electrode holder takes place via a tube which runs coaxially to the electrode and which is closed at its lower end with a plug which ends in a bolt thread.
  • An end cap made of copper is screwed onto this, in which four load cells are arranged, which are supported on the bottom of the end cap and which in turn support an extension of a rod passing through the bottom of the end cap, on which the electrode holder hangs.
  • the disadvantage of this arrangement is that, due to the current-carrying end cap surrounding them, the load cells are relatively strongly exposed to the heat due to the heat conduction via the electrode holder and the current. For this reason, four load cells are required in a compensation circuit.
  • Another possibility of weighing the electrodes during the process is, according to DE-AS 19 34 218, that a pressure transducer is installed in the suspension of the electrode carriage.
  • the electrode holder is arranged on a lever connected to the electrode carriage via a axis of rotation extending transversely to the longitudinal axis of the electrode, and in that a load cell on the one hand on the lever and on the other hand on the electrode carriage, optionally via with under circuitry of a retaining bolt is supported, the power supply to the electrode preferably, as is known per se from AT-PS 333.450, via two parallel and at equal intervals from the load cell leads. It is possible to route the power lines at a considerable distance from the load cell, with the current effects on the load cell practically canceling out in the case of lines connected in parallel and at equal distances from the load cell.
  • the load cell can be placed in a location shielded from the radiant heat of the weld pool or the heated parts. In this context, it is advantageous if the load cell is arranged on the top of the electrode carriage.
  • the load on the lever by the electrode holder and the cables etc. is distributed or balanced as evenly as possible.
  • the load cell is practically only loaded by the weight of the electrode and the clamping bolt and the desired high accuracy of weighing is achieved.
  • both tensile or pressure load cells and load cells which respond to torsional forces can be used.
  • the lever It is only necessary to connect the lever in a rotationally fixed manner to a shaft stub, which in turn is connected to the load cell, which is fixed in a rotationally fixed manner to the electrode carriage.
  • the lever is designed as a two-armed lever, at the end region facing away from the electrode holder which is connected to the Load cell connected to the electrode carriage attacks.
  • the load cell can thus be shielded in a simple manner from the heat influence of the slag bath or other parts and can be arranged at a considerable distance from the electrode.
  • a corresponding choice of the dimensions of the lever arms results in the possibility of using load cells with the same measuring ranges for different electrode dimensions.
  • Various connection points can be provided for connecting the load cell to the lever.
  • the lever can also be designed as a one-armed support part lying directly on the load cell.
  • the distance between the electrode and the support column of the electrode carriage and thus the projection of the electrode holder can thus be changed by moving the slide without changing the lever arms, so that there is no impairment of the weighing or the weighing accuracy.
  • the position change transversely to the direction of slide displacement that may be required for adjusting the electrode can be achieved by rotating the electrode carriage about the axis of the support column.
  • FIGS. 1, 3 and 5 each show an embodiment of the device according to the invention in elevation, FIGS. 2, 4 and 6 in plan view, the restriction for FIGS. 3 to 6 being that details which cannot be found refer to the modified lever construction, are largely omitted.
  • An electrode carriage 1 is fastened and lowered on a support column 2 by means of a drive (not shown), the drive control being carried out as a function of the electrode weight.
  • the electrode carriage 1 is designed like a console and on its upper side it carries, in a mirror-image arrangement, a plurality of uprights 3, to which the lines 4 connected in parallel, which serve for the current supply to the electrode 12, are fastened.
  • an axis of rotation 5 is mounted, on which a two-armed lever 6 is pivotably arranged and is thus connected to the electrode carriage 1.
  • the lever 6 At its end facing away from the support column 2, the lever 6 carries on its upper side two gripping jaws 7 connected to the lines 4. These jaws 7 together with the two levers 9 pivotable about the axes 8 perpendicular to the lever 6 and the lever 9 connected to them Piston-cylinder arrangement 10 an electrode holder 11.
  • the jaws 7 can be clamped against an electrode rod 13, which is preferably connected by welding, whereby the electrode 12 is held and at the same time the current flow to the electrode 12 is ensured becomes.
  • Tilting of the lever 6 under the load of the electrode 12 is prevented by a bolt 14 fastened to the electrode carriage 1, to which also a load cell, preferably a pressure cell 15 is fastened or supported via a nut 16 in such a way that the lever 6 is on its upper side bears against the pressure cell with which the respective weight of the electrode 12 can be determined.
  • the lines 4 run at equal, relatively large distances from the pressure cell 15, so that the influence of the magnetic forces caused by the current flow is small and these forces moreover due to the parallel connection and the symmetrical arrangement of the two power supply lines 4 almost completely compensate.
  • the electrode carriage 1 is usually made of solid material, there is also a very good shielding of the pressure cell 15 against the radiant heat of the molten bath, which can be further easily achieved by the arrangement of heat-insulating plates on the underside of the electrode carriage 1 can improve.
  • the fact that its distance from the electrode 12 or the electrode rod 13 is relatively large also contributes to a merely low thermal load on the pressure sensor 15.
  • the respective weight of the electrode 12 including the electrode rod 13 can always be determined by means of the pressure cell 15, only a small tare weight being measured. The latter can be largely reduced by appropriate design of the lever 6 or arrangement of the electrode holder 11 and, if desired, also z. B. fully compensate by attaching counterweights to the lever 6.
  • 3 to 6 illustrate two further variants of the lever construction with which the projection of the electrode holder can be changed without the weighing being influenced thereby.
  • a guide 18 is incorporated in the upper part thereof, in which a slide 17 is arranged or guided in a displaceable manner.
  • the double-armed lever 6 corresponds to that of FIGS. 1 and 2 and the axis holder of the axis of rotation 5 and the retaining bolt 14 are arranged on the carriage 17, in the embodiment according to FIGS.
  • a one-armed lever 6 ' formed as a supporting part for the electrode holder 11, not shown, which is rotatably mounted on the carriage 17 by means of the axis 5' and immediately bar rests on the pressure cell 15, which also rests on the carriage 17.
  • the devices according to the invention are also suitable for the production of steel blocks by block casting and subsequent hot topping.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Furnace Details (AREA)
EP19830890082 1982-05-12 1983-05-11 Dispositif de fusion comportant des électrodes consommables Expired EP0094378B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT186182A AT373177B (de) 1982-05-12 1982-05-12 Einrichtung zur durchfuehrung von umschmelzverfahren mit selbstverzehrenden elektroden
AT1861/82 1982-05-12

Publications (3)

Publication Number Publication Date
EP0094378A2 true EP0094378A2 (fr) 1983-11-16
EP0094378A3 EP0094378A3 (en) 1984-05-02
EP0094378B1 EP0094378B1 (fr) 1985-12-27

Family

ID=3522581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830890082 Expired EP0094378B1 (fr) 1982-05-12 1983-05-11 Dispositif de fusion comportant des électrodes consommables

Country Status (3)

Country Link
EP (1) EP0094378B1 (fr)
AT (1) AT373177B (fr)
DE (1) DE3361622D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5260966A (en) * 1992-03-13 1993-11-09 Leybold Durferrit Gmbh Remelting arc furnace with movable electrode
WO2007137871A1 (fr) 2006-05-31 2007-12-06 Biosynthema Inc. Combinaison d'une solution d'acide aminé et d'un dérivé de gélatine pour inhiber l'absorption rénale
WO2019091994A1 (fr) * 2017-11-08 2019-05-16 Sms Mevac Gmbh Four de fusion pourvu d'une tige d'électrode rotative et déplaçable simultanément
CN111727093A (zh) * 2018-02-14 2020-09-29 Ald真空技术有限公司 重熔设备及用于操作重熔设备的方法
WO2020225447A1 (fr) 2019-05-08 2020-11-12 ITM Isotopen Technologien München AG Acide para-aminohippurique (pah) en tant que substance protectrice rénale

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140724A1 (de) * 1991-12-10 1993-06-17 Leybold Durferrit Gmbh Umschmelzanlage und verfahren zum betreiben einer solchen
DE102010025236A1 (de) 2010-02-18 2011-08-18 SMS Siemag AG, 40237 Elektrodentragarm eines schmelzmetallurgischen Ofens

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATA559376A (de) * 1976-07-29 1978-10-15 Inteco Int Techn Beratung Anlage zum elektroschlacken-umschmelzen von abschmelzelektroden zu bloecken
US4091229A (en) * 1977-03-01 1978-05-23 Wooding Corporation Slag and alloy feeding based on electrode weight
DE2755478C2 (de) * 1977-12-13 1982-03-18 Institut elektrosvarki imeni E.O. Patona Akademii Nauk Ukrainskaja SSR, Kiev Anlage zur Herstellung von Gußblöcken im Elektroschlacke-Umschmelzverfahren
US4303797A (en) * 1980-06-20 1981-12-01 Consarc Corporation Method and apparatus for controlling electrode drive speed in a consumable electrode furnace

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5260966A (en) * 1992-03-13 1993-11-09 Leybold Durferrit Gmbh Remelting arc furnace with movable electrode
WO2007137871A1 (fr) 2006-05-31 2007-12-06 Biosynthema Inc. Combinaison d'une solution d'acide aminé et d'un dérivé de gélatine pour inhiber l'absorption rénale
WO2019091994A1 (fr) * 2017-11-08 2019-05-16 Sms Mevac Gmbh Four de fusion pourvu d'une tige d'électrode rotative et déplaçable simultanément
US11371779B2 (en) 2017-11-08 2022-06-28 Sms Group Gmbh Melting furnace with simultaneously rotatable and movable electrode rod
CN111727093A (zh) * 2018-02-14 2020-09-29 Ald真空技术有限公司 重熔设备及用于操作重熔设备的方法
CN111727093B (zh) * 2018-02-14 2022-04-15 Ald真空技术有限公司 重熔设备及用于操作重熔设备的方法
WO2020225447A1 (fr) 2019-05-08 2020-11-12 ITM Isotopen Technologien München AG Acide para-aminohippurique (pah) en tant que substance protectrice rénale
WO2020224780A1 (fr) 2019-05-08 2020-11-12 ITM Isotopen Technologien München AG Acide para-aminohippurique (pah) en tant que substance protectrice rénale
EP4218749A1 (fr) 2019-05-08 2023-08-02 ITM Isotope Technologies Munich SE Acide para-aminohippurique (pah) en tant que substance protectrice rénale

Also Published As

Publication number Publication date
AT373177B (de) 1983-12-27
DE3361622D1 (en) 1986-02-06
ATA186182A (de) 1983-05-15
EP0094378A3 (en) 1984-05-02
EP0094378B1 (fr) 1985-12-27

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