• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A plant for remelting self-consumable electrodes can be operated both as a vacuum arc furnace and as an electroslag remelting plant, the plant having both a direct-current (26) and an alternating current supply (27) and alternatively to a vacuum pump system (16). or a protective gas supply (24) and flue gas extraction (21) and a metering device (31, 32) for slag and deoxidizer can be connected.
    公开号:AT512471A1
    申请号:T1572012
    申请日:2012-02-07
    公开日:2013-08-15
    发明作者:Harald Dipl Ing Dr Holzgruber；Alexander Dipl Ing Scheriau；Manfred Dipl Ing Ramprecht；Michael Dipl Ing Fh Breitler；Christoph Dr Heischeid；Herbert Klaus Damm
    申请人:Inteco Special Melting Technologies Gmbh；
    IPC主号:
    专利说明:

    Remelting plant for consumable electrodes So-called remelting processes are used for the production of high-quality blocks of steels as well as Ni and Co base alloys, in which a self-depleting melting electrode is remelted by supplying electrical energy to a remelting block, which is built up gradually in a water-cooled mold , The reflow rate is chosen so that a flat melt sump is maintained and the solidification from the bottom to the head slowly progresses until the entire electrode has melted.
    Essentially, two variants of the method have attained technical significance. These are on the one hand the vacuum arc process, in the Anglican literature called "Vacuum Are Remelting" (VAR) and on the other hand the electroslag remelting process (ESU), in English called "Electroslag Remelting" (ESR).
    Each of these two processes has distinctive features, which are briefly outlined below.
    In the vacuum arc process, the melting of the electrode takes place in a closed furnace vessel, consisting of a furnace hood and the chill pot through which the cooling water flows, under which the copper crucible, which is closed with a base plate, is suspended in a vacuum to hold the remelting block. Alternatively, a complete, consisting of water tank and copper insert mold closed with a water-cooled bottom plate and connected directly to the hood. The Abschmelzelektrode is held by a mounted at the lower end of an electrode rod hydraulically or pneumatically actuated terminal, which also serves to power transmission. The electrode rod is movable in the vertical direction and serves to supply the Abschmelzelektrode to the molten bath in the way it melts. A vacuum-tight implementation allows the vertical movement of the
    Electrode rod. The vacuum in the furnace vessel is created by a set of mechanical pumps. The energy required for the remelting is from a
    Page 1 of 6
    DC power source supplied, one pole of which is connected to the electrode rod and thus the Abschmelzelektrode, while the other pole is connected to the bottom plate or the mold, the return of the mold on the Kokillenflansch and possibly even on the hood can be performed ensure coaxiality between supply and return lines. The melting energy is generated by an arc burning between the tip of the consumable electrode and the surface of the molten bath. In order to maintain a stable arc, the distance between the tip of the electrode and the sump must be strictly adhered to.
    In electroslag remelting, the melting of the electrode takes place in a metallurgically active slag bath, which represents an ohmic resistance and which is heated during the passage of the current from the electrode to the melt sump to temperatures which result in melting of the electrode. In order to avoid polarization effects in the slag bath, electro-smelt remelting uses current sources which supply alternating current either at mains frequency or at a frequency generally lower than alternating current. Similar to the vacuum arc method, the molten metal is collected in a water-cooled crucible and a remelting block is built up step by step. By a suitable device, the Abschmelzelektrode is nachgefahren in the manner in the slag bath, as it melts, so that the electrode tip is constantly immersed in the slag bath.
    Basically, the electroslag remelting can be done in air, since the metal bath is completely covered by the liquid slag and so a contact of the ambient air is prevented with the liquid metal. Today, however, in modern plants it is necessary to remelt under a controlled inert gas atmosphere which is either at atmospheric pressure but may also be above or below it. Thus, modern ESU systems also have a gas-tight seated on the upper edge Kokillenrand hood with a likewise gas-tight passage for the electrode rod, by means of which the Abschmelzelektrode is traced and over which the melt flow is passed to the electrode. The melt stream then passes back through the slag bath and the remelted block and the bottom plate or mold
    Page 2 of 6
    Power source. Again, the return line from Kokillenflansch over the hood and from there to the second pole of the power source is often performed.
    Both methods are used to produce high-quality remelt blocks, giving preference on a case-by-case basis to one method and then another, which can lead to problems with capacity or blanking of the particular equipment designed for their particular process. In this case, essential plant components are largely identical in both procedures, such as > the water-cooled mold for receiving the remelted block > the cooling water supply of mold and critical system components > the hood with a gas-tight or vacuum-tight passage for the electrode rod > the electrode rod for power supply with the advancing device and a current clamp > the high current lines between power source and electrode bar or base plate, mold flange or hood > Much of the control as well as virtually all operations differences between the procedures exist as follows: > in the case of the melt power supply, which is a DC power source in the vacuum arc method, and an AC power source in the ESU method > The vacuum arc furnace requires a vacuum generating plant with appropriate control consisting of several mechanical vacuum pumps
    Page 3 of 6 > a protective gas ESU system requires a protective gas supply with appropriate control and a Rauchgasabsaugung with filter > a shielding gas ESU system requires a metering device for a controlled addition of slags and deoxidizers and alloys
    The aim of the present invention is to avoid the above-described problems in terms of insufficient capacity or utilization in specialized systems by using systems that are suitable or adaptable for each of the two variants of the method.
    The invention accordingly provides a plant for remelting self-consumable electrodes into blocks in water-cooled molds, which can be operated alternatively both as a vacuum arc furnace and as an electroslag remelting plant, wherein both the melt power supply and the process control and the vacuum pump set or the protective gas system and the dosing system so are designed switchable, that the system can be adapted to the requirements of the respective process.
    The system according to the invention can therefore be equipped with two power supplies which are installed side by side but can be operated separately, one of which represents a DC power supply and the second is an AC transformer or a thyristor-controlled converter system.
    The system can also be equipped with a single thyristor-controlled converter system, which can either DC or AC with a frequency of max. 20 Hertz can deliver.
    Fig. 1 shows the schematic structure of a system according to the invention.
    In a water-carrying cooling pot (1) a Kupfertiegei (2) is mounted, which serves to receive the remelted block (3) by melting an electrode (9) either in a hot slag bath (4) or by a between the lower end of the Electrode (9) and the liquid metal sump (6) burning arc (5) is produced. The cooling of the block (3) will
    Page 4 of 6 through the on the inlet stub (7) fed and along the gap between the cooling pot (1) and copper crucible (2) flowing upward cooling water causes, which flows through the outlet nozzle (8).
    The Abschmelzelektrode (9) is held by a current clamp (14) and pressed by a hydraulically operated pull rod (13) against the contact surface (30) of the electrode rod (12), whereby the contact with the power supply line (28) is prepared, which in turn with a melt current source (26, 27) is connected.
    In the vertical direction by means of a suitable, not shown here device movable electrode rod (12) is guided by a vacuum or gas-tight passage (11) in the through the furnace hood (10) formed interior.
    From the furnace hood (10), a vacuum line (15) leads to the vacuum pump set (16). The vacuum gate valve (17) is open during vacuum arc operation and is closed when the system is operated as an ESU system. In ESU operation, the vacuum slide (17) remains closed and the likewise vacuum-tight slide (19) is opened, whereby the exhaust pipe (18) with dust filter (20) and fan (21) is released.
    In addition, in the case of ESC operation, the likewise vacuum-tight slide (23) is opened, as a result of which the addition of slag or alloying elements from the container (31) via the supply line (22) is made possible by actuation of the metering device (32).
    In the case of ESU operation under protective gas, this passes via the protective gas line (24) and a suitable metering valve (25) via the line (22) or else directly into the interior formed by the hood (10).
    The supply of the melt stream to the electrode rod (12) via the high current line (28), which is connected to one pole of the melt power supply (26, 27) via the high-current switch (26 a, 27 a). The return of the melt stream (29), as shown here, from the flange of the mold (2) to the second pole of the melt power supply (26, 27), but can also from the bottom of the copper crucible (2) or from the furnace hood (10) respectively.
    Page 5 of 6
    To operate the system as a vacuum arc furnace with arc heating (5), the following conditions must be met. ≫ Sliders (19) and (23) are closed and vacuum pushers (17) are opened > Vacuum pumps (16) in operation > Protective gas supply switched off, metering valve (25) closed > DC power supply (26) in operation, high current switch (26a) closed and high current switch (27a) interrupted
    If the system is operated in ESC mode with melting of the electrode (9) in a slag bath (4), the following conditions must be fulfilled: > Vacuum slide (17) closed and slide (19) and slide (23) and metering valve (25) opened > Vacuum pumps (16) out of operation, fan (21) and inert gas supply (24) in operation > AC power supply (27) in operation, high current switch (27a) closed and high current switch (26a) interrupted
    Page 6 of 6
    权利要求:
    Claims (6)
    [1]
    1. Plant for remelting self-consuming electrodes (9) to blocks (3) in a water-cooled mold (2), characterized in that the plant can be operated alternatively both as a vacuum arc furnace and as an electroslag remelting system, both melt supply and vacuum - Protective gas system and the process control are designed so switchable that they are adapted to the requirements of each applied process.
    [2]
    2. Installation according to claim 1, characterized in that the high circuit of the system is switchable both to a DC power supply (26) and an AC power supply (27) with an AC frequency of less than 100 Hertz connectable.
    [3]
    3. Plant according to claim 1, characterized in that as a melt power supply a single both for DC operation and for AC operation to max. 20 hertz suitable thyristor converter system is used.
    [4]
    4. Installation according to one of claims 1 - 3, characterized in that the system has a sufficient for the vacuum arc process vacuum system (16) whose connecting line (15) can be interrupted for melting by a vacuum-tight slide (17).
    [5]
    5. Installation according to one of claims 1 - 4, characterized in that the system via one or more containers (31) with metering device (32) for adding slag and / or deoxidants and the supply line (22) to the melting region by a vacuum-tight Slider (23) can be interrupted.
    [6]
    6. Installation according to one of claims 1-5, characterized in that in the plant area in front of the slide (17) to the vacuum system (16) with a vacuum-tight slide (19) mounted line (18) is installed, from which a connection a Rauchgasabsaugung (21) with filter (20) can be produced. Page 1 of 1
    类似技术:
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    同族专利:
    公开号 | 公开日
    WO2013117529A1|2013-08-15|
    AT512471B1|2014-02-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0042689A1|1980-06-20|1981-12-30|Consarc Corporation|Method and apparatus for controlling electrode drive speed in a consumable electrode furnace|
    DE3912928A1|1989-04-20|1990-10-25|Leybold Ag|Enclosed electroslag remelting furnace - with upper and lower part and movable valve disc|
    US4953177A|1989-07-03|1990-08-28|Allegheny Ludlum Corporation|Method and means of reducing the oxidization of reactive elements in an electroslag remelting operation|
    AT410412B|2000-11-10|2003-04-25|Inteco Int Techn Beratung|METHOD OF ELECTRIC SLACKING METHODS OF MELTING METALS|
    US7381366B2|2003-12-31|2008-06-03|General Electric Company|Apparatus for the production or refining of metals, and related processes|
    EP1925681B1|2006-11-15|2011-04-27|Inteco special melting technologies GmbH|Method for electro slag remelting of metals and mould therefor|CN107586964B|2017-10-23|2020-08-25|沈阳真空技术研究所有限公司|Vacuum consumable electrode arc skull furnace|
    RU2748757C1|2017-11-08|2021-05-31|Смс Груп Гмбх|Melting furnace with simultaneous rotating and moving electrode rod|
    DE102018009375A1|2017-12-04|2019-06-06|Vdm Metals International Gmbh|Process for producing a nickel-base alloy|
    法律状态:
    2018-10-15| MM01| Lapse because of not paying annual fees|Effective date: 20180207 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT1572012A|AT512471B1|2012-02-07|2012-02-07|TRANSPORT SYSTEM FOR SELF-INVERTING ELECTRODES|AT1572012A| AT512471B1|2012-02-07|2012-02-07|TRANSPORT SYSTEM FOR SELF-INVERTING ELECTRODES|
    PCT/EP2013/052207| WO2013117529A1|2012-02-07|2013-02-05|System for remelting a consumable electrode into a block during metal production|
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