EP0717119B1 - Verfahren zur Herstellung von einer aktiven metallenthaltenden Kupferlegierung - Google Patents

Verfahren zur Herstellung von einer aktiven metallenthaltenden Kupferlegierung Download PDF

Info

Publication number
EP0717119B1
EP0717119B1 EP95307543A EP95307543A EP0717119B1 EP 0717119 B1 EP0717119 B1 EP 0717119B1 EP 95307543 A EP95307543 A EP 95307543A EP 95307543 A EP95307543 A EP 95307543A EP 0717119 B1 EP0717119 B1 EP 0717119B1
Authority
EP
European Patent Office
Prior art keywords
pouring
molten metal
pressure
vacuum
melting furnace
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.)
Expired - Lifetime
Application number
EP95307543A
Other languages
English (en)
French (fr)
Other versions
EP0717119A3 (de
EP0717119A2 (de
Inventor
Takashi c/o Kurami Works of Nippon Shimada
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.)
Nippon Mining & Metals Co Ltd
Original Assignee
Nippon Mining and Metals Co Ltd
Nippon Mining Co Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=17348069&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0717119(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Nippon Mining and Metals Co Ltd, Nippon Mining Co Ltd filed Critical Nippon Mining and Metals Co Ltd
Publication of EP0717119A2 publication Critical patent/EP0717119A2/de
Publication of EP0717119A3 publication Critical patent/EP0717119A3/de
Application granted granted Critical
Publication of EP0717119B1 publication Critical patent/EP0717119B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/113—Treating the molten metal by vacuum treating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/04—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like tiltable
    • B22D41/05—Tea-pot spout ladles

Definitions

  • the present invention relates to a method of manufacturing a copper alloy ingot containing an active metal.
  • active metal for example, iron, titanium, chromium, zirconium, etc.
  • active metal for example, iron, titanium, chromium, zirconium, etc.
  • the so-called vacuum melting method which has been used heretofore to melt the copper alloy in an induction melting furnace placed within an airtight container which has been evacuated (hereinafter called “melting furnace"), is an effective means for preventing oxidation of the copper alloy.
  • a vacuum casting method which makes a casting into a mold housed within the airtight container of the melting furnace is effective as a means to cast molten metal under such a state as to preserve the cleanliness of the molten metal which has been vacuum melted.
  • a casting within the airtight container having a limited space will be limited to the so-called ingot making process in which such fabrication of the thus obtained ingot as forgoing and scalping, etc. will be needed before a hot rolling.
  • casting by a continuous casting process is desirable for producing large size ingots which can be directly hot rolled, from the standpoint of cost competitiveness.
  • it takes a huge amount of investment for housing the entire continuous casting equipment within the airtight container.
  • slag flowing in along with the tilting of the melting furnace as well as the oxidation of the active metal at the pouring spout and in the transfer path will be unavoidable, which could severely impair the quality of the ingot.
  • the present invention in view of what has been described above, has the object of providing a method of manufacturing a copper alloy containing an active metal, which can restrain the generation of slag even if scrap is melted as feedstock during the melting and casting of the copper alloy containing the active metal, and which enables the molten metal to be dispensed to the outside of the furnace without including slag, and at the same time enables large size ingot to be manufactured with satisfactory cleanliness by continous casting.
  • Patent Abstracts of Japan, Vol 9 No 256 (M-421) and JP-A-60/106648 disclose apparatus for melting copper alloys containing Zr, Ti, Cr etc in which a crucible is heated in a closed chamber which can be evacuated or pressurized with an inert gas. Copper alloy is cast, as a wire, by lowering a nozzle into the crucible, lowering a seed wire down the nozzle, increasing the pressure inside the chamber to force the molten copper alloy into the nozzle to contact the seed wire, and thereafter by pulling up the seed wire.
  • the copper alloy wire obtained by this means has an outside diameter conforming to the inside diameter of the nozzle.
  • the present invention provides a method of manufacturing a copper alloy casting containing an alloying metal which has a greater chemical affinity for oxygen than copper, said method comprising the following steps:
  • a method to apply pressure from the pressure pipe and pour the molten metal, which has been vacuum melted, continuously from the pouring nozzle by utilizing the pouring siphon and further to continuously cast the molten metal poured from the pouring nozzle can be employed.
  • the amount of slag generated during the vacuum induction melting can be restrained even if the feedstock is scrap, and when the pouring is made under pressure by utilizing the pouring siphon after the melting, the casting can be made while avoiding oxidation of the metal and the inclusion of the slag at a time when the melting furnace is tilted, and a scalping, etc. can be eliminated in an after treatment for the continuously cast ingot.
  • a copper alloy containing an active metal or scrap is fed into a melting furnace, then a vacuum melting furnace cover is assembled to an upper end of an airtight container housing the melting furnace, and the container is tightly closed, thus forming the so-called vacuum melting furnace. Also, the inside of the airtight container is evacuated through a vacuum evacuation pipe to a desired pressure level by a vacuum evacuation device. Then, the feedstock or scrap in the melting furnace is melted by induction heating.
  • the furnace cover of the vacuum melting furnace is replaced by a pressure pouring furnace cover; the latter furnace cover is fixed in place, and thus the airtight container is tightly closed again.
  • the molten metal within the furnace is briefly exposed to the atmosphere when the replacement of covers is taking place, the layer of the slag which floats up to the surface of the molten metal constitutes a covering film, and thus the oxidation of the molten metal within the furnace is restrained, minimised or largely prevented.
  • the molten metal poured from the pouring nozzle is received by a molten metal receptacle such as a tundish; the molten metal is stored within the molten metal receptacle, and oxides which have been unavoidably included float up and separate. Molten metal having a higher level of cleanliness can be poured to the continuous casting machine from a casting nozzle provided at a bottom of the molten metal receptacle.
  • the application of pressure to the inside of the airtight container which is tightly closed with the pressure pouring furnace cover is made with an inert gas and the inside of the molten metal receptacle such as a molten metal receiving chamber, a tundish, etc. is provided with an inert atmosphere, oxidation of the molten metal in a molten metal transfer path from the melting furnace to the continuous casting machine can be prevented.
  • a method of manufacturing copper alloys containing active metal according to the present invention will be explained taking the case of Cu - 1% Fe alloy as an example. % figures quoted herein are in accordance with normal metallurgical practice, unless indicated to the contrary.
  • the active metal contained in the copper alloy in this example is iron and the amount contained is 1 weight %, this constitutes merely one embodiment of the present invention and the iron content is not to limit the scope of the present invention. Also, while iron is taken in this example as the active metal contained in the copper alloy and explanations are made therefor, this also is not to limit the scope of the present invention.
  • the active metal in the present invention indicates every metal element having greater chemical affinity for oxygen than copper. Therefore, aluminum for instance is also included in addition to the kinds of metal listed previously.
  • the copper alloy may include one, two or more kinds of different active metal and metals other than the active metal.
  • composition of copper, electrolytic iron, and alloy scrap was so determined that the ratio of scrap in the feedstock to be melted was adjusted to be 30%.
  • Fig. 1 is a partial cross sectional view of an airtight container 5 housing an induction melting furnace 4 of a core-less crucible type, and a vacuum melting furnace cover 9 is mounted on an upper end of the container 5.
  • 1 is a yoke
  • 2 represents heating coils
  • 3 is a crucible
  • 6 shows heat insulating bricks
  • 7 is a castable refractory, all of which are known in relation to an induction furnace. What is shown as 11 is packing.
  • the inside of the airtight container 5 is evacuated by a vacuum pump (not shown in the drawing) through a vacuum evacuation pipe 12, and the feedstock which had been charged beforehand into the melting furnace 4 is vacuum melted.
  • the remainder of the feedstock, during the melting operation, is additionally charged to the inside of the melting furnace 4 as several divided portions of charges by lowering, using an elevating device 19, a feedstock charging bucket 18 in a feedstock charging device 13, provided above the vacuum melting furnace cover 9 which is lined with heat insulating material 10.
  • a gate valve 14 is opened by an air cylinder 15, and after charging with feedstock the gate valve 14 is closed again and the inside of the melting furnace is evacuated.
  • What is shown as 17 is a feedstock charging chamber door for releasing the feedstock charging device 13 when the feedstock charging bucket 18 is replaced.
  • the inside of the feedstock charging device 13 can also be evacuated by a vacuum pump (not shown in the drawing) through a vacuum evacuation pipe 16, so that the additional charging of feedstock may be done also under vacuum.
  • thermocouple 20 provided in a temperature sensing chamber 21 of a molten metal temperature sensing equipment 23 was pushed into the molten metal 8 for measuring the temperature thereof.
  • the vacuum melting furnace cover 9 and a pressure pouring furnace cover 25 were interchanged by a shifting device not shown in the drawings.
  • Fig. 2 is a cross sectional view of the same airtight container 5 housing the induction heating furnace 4 of a core-less crucible type. Now shown is a pressure pouring furnace cover 25 which is assembled to an upper end of the container 5 with bolts 28 and a retaining metal fitting 29.
  • inert gas pressure controlled by a pouring pressure control device (not shown in the drawing) is applied to the inside of the airtight container 5 through a pressure pipe 26 provided in wall 27 of the pressure pouring furnace cover 25, the surface of the molten metal 8, which is covered with a layer of slag, in the melting furnace 4 is pushed down, causing the molten metal to ascend a pouring siphon 32 which has been inserted so as to reach a bottom part of the melting furnace and is raised or pumped up to a pouring gutter 34 in a pouring chamber 31.
  • the upper part of the pouring chamber 31 is tightly closed with a pouring chamber closing cover 35, which can be opened and closed, and an inert gas is sealed in from a gas pipe 38 for preventing the oxidation of the molten metal 37 during pouring.
  • an electric heater (not shown in the drawing) is provided at a side wall of the pouring chamber 31 and the pouring gutter 34 within the pouring chamber 31 is heated by the electric heater to a temperature higher than the melting point of the copper alloy, whereby the molten metal within the pouring chamber 31 can be maintained at a constant temperature.
  • a pressure control device not shown in the drawing
  • the molten metal at the bottom of the furnace ascends the pouring siphon 32 and the slag 52 is kept afloat and separated.
  • floating slag 52 is kept atop the surface of the molten metal in the furnace until a prescribed amount of the molten metal has been discharged, so the slag will not contaminate the molten metal being poured to the tundish 44.
  • a casting nozzle 48 is provided at a bottom of the tundish 44. After closing the casting nozzle 48 e.g. with a stopper 49 and sufficient preheating is done by a gas burner (not shown in the drawing), the molten metal is received through the lance pipe 39 under pressurized pouring. When a prescribed amount of the molten metal 46 has been accumulated in the tundish 44, the stopper 49 is lifted by a control device (not shown in the drawing) to open the casting nozzle 48. Molten metal 46 is then supplied to the inside of a water cooled copper mold 51 in a semi-continuous casting equipment from the bottom of the tundish 44 through the casting nozzle 48, and is cooled and solidified. The thus-solidified ingot is continuously drawn vertically downwards with a constant speed by a hydraulic cylinder, not shown in the drawing.
  • a predetermined amount of the molten metal is stored in the tundish 44. Oxides of iron which have been unavoidably mixed into the molten metal 46 float to its surface and separate again. Thus only molten metal with a high level of cleanliness at the bottom part of the tundish flows into the casting nozzle 48 and is supplied to the continuous casting machine.
  • the lance pipe 39 is connected beneath the pouring nozzle 33 and its forward end is inserted into the tundish 44, the molten metal descending from the pouring nozzle 33 enters the inside of the tundish 44 without being exposed to the atmosphere. Also, an upper part of the tundish 44 is tightly closed with a tight closing cover 47 which can be opened and closed, and inert gas supplied from a gas pipe 50 is sealed therein, thus preventing oxidation of the molten metal received in the tundish.
  • the molten metal 46 stored in the tundish 44 is induction heated by a heating coil 41 provided in the tundish 44, so the molten metal can always be kept at a constant temperature.
  • feedstock prepared totally from alloy bullion was, after vacuum melting, continuously cast by atmospheric pouring, i.e. unprotected from the air, by tilting the furnace.
  • Table 1 shows the number of oxides of iron per 1 cm 2 when an observation was made for an observation area in the cross section of 20 cm 2 , as well as the maximum length of the oxide inclusions.
  • a continuous casting can be made without including slag which has inevitably been generated. Therefore even when scrap, which cannot be used in conventional vacuum melting, is melted as a feedstock, a pour can be made without including slag. Moreover, molten metal free of large size oxides, which were contained in the molten metal but which have separated, can be continuously cast, thus realizing an effect that melting and casting of the copper alloy containing an active metal can be produced at low cost and an ingot of a high quality with little contamination can be obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Continuous Casting (AREA)

Claims (3)

  1. Verfahren zur Herstellung eines Kupferlegierungs-Gußstücks, das ein Legierungsmetall enthält, welches eine größere chemische Affinität zu Sauerstoff als Kupfer besitzt, wobei das Verfahren die nachstehenden Schritte aufweist:
    (I) ein Ausgangsmaterial wird mittels eines Induktionsschmelzofens (4) im Vakuum geschmolzen, der in einem luftdichten Behälter (5) untergebracht ist, welcher dicht mit einer Vakuumschmelzofenabdeckung (9) verschlossen ist und welcher mittels einer Vakuumleitung (12) evakuiert ist;
    (II) die Vakuumschmelzofenabdeckung (9) wird durch eine Druckgießofenabdeckung (25) mit einem Gießsiphon (32) ersetzt, und wenn der luftdichte Behälter dicht verschlossen ist, wird Inertgas unter Druck von einem Druckrohr (26) in das Innere des luftdichten Behälters (5) eingebracht, um das geschmolzene Metall zum Aufsteigen in dem Gießsiphon zu veranlassen, wobei ein Auslaßteil des Gießsiphons (32) mit einer einen Gießauslauf (33) aufweisenden Gießkammer (31) verbunden ist, und in welcher eine flüssige Oberfläche des geschmolzenen Metalls durch eine Inertgasatmosphäre geschützt ist, eine Einlaßseite des Siphons (32) als ein Einströmteil ausgebildet ist, wobei sich dessen Öffnung am unteren Ende zu einem unteren Teil des Induktionsschmelzofens (4) hin öffnet, wodurch in den Gießsiphon (32) strömendes geschmolzenes Metall wirksam an einem Kontakt mit Luft und einer Oxidation gehindert wird, und
    (III) das aus dem Gießauslauf (33) gegossene geschmolzene Metall unter Inertgas in einem Sammelbehälter (44) für geschmolzenes Metall gesammelt wird, und das geschmolzene Metall dann aus einem in dem Boden des Sammelbehälters vorgesehenen Gußauslauf (48) ausgelassen und kontinuierlich gegossen wird.
  2. Verfahren nach Anspruch 1, wobei Schrott mindestens als ein Anteil des zu schmelzenden Ausgangsmaterials verwendet wird.
  3. Verfahren nach Anspruch 1 oder 2, wobei Druck mit einem Inertgas auf das Innere des luftdichten Behälters aufgebracht wird, wenn er dicht durch die Druckgießofenabdeckung (25) verschlossen ist.
EP95307543A 1994-10-25 1995-10-24 Verfahren zur Herstellung von einer aktiven metallenthaltenden Kupferlegierung Expired - Lifetime EP0717119B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP260447/94 1994-10-25
JP26044794 1994-10-25
JP6260447A JP3003914B2 (ja) 1994-10-25 1994-10-25 活性金属を含有する銅合金の製造方法

Publications (3)

Publication Number Publication Date
EP0717119A2 EP0717119A2 (de) 1996-06-19
EP0717119A3 EP0717119A3 (de) 1996-08-21
EP0717119B1 true EP0717119B1 (de) 2001-04-25

Family

ID=17348069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95307543A Expired - Lifetime EP0717119B1 (de) 1994-10-25 1995-10-24 Verfahren zur Herstellung von einer aktiven metallenthaltenden Kupferlegierung

Country Status (3)

Country Link
EP (1) EP0717119B1 (de)
JP (1) JP3003914B2 (de)
DE (1) DE69520779T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8030082B2 (en) 2006-01-13 2011-10-04 Honeywell International Inc. Liquid-particle analysis of metal materials
IT202200006914A1 (it) * 2022-04-07 2023-10-07 Danieli Off Mecc Dispositivo di carica rottame per caricare rottame in un crogiolo di un apparato di fusione sottovuoto

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2124960C1 (ru) * 1998-08-04 1999-01-20 Назаров Владимир Николаевич Устройство для регулирования расхода жидкого металла
NO320254B1 (no) * 2003-06-30 2005-11-14 Norsk Hydro As Metode og utstyr for kontinuerlig eller semikontinuerlig stoping av metall
EP1900458A1 (de) * 2006-09-15 2008-03-19 Calamari S.p.A. Giessvorrichtung zum Giessen von Metallschmelzen
JP2008290122A (ja) * 2007-05-25 2008-12-04 Hitachi Cable Ltd 銅合金線の製造方法
CN102784981A (zh) * 2011-05-20 2012-11-21 昆山市瑞捷精密模具有限公司 慢走丝电火花线切割金属丝及其制备方法
CN102632226B (zh) * 2012-03-28 2013-04-10 攀枝花市立宇矿业有限公司 铸锭的设备及精炼与铸锭一体化生产工艺
CN104357698B (zh) * 2014-09-28 2016-06-22 江苏中容铜业有限公司 一种引线框架铜带基材生产系统
JP6471553B2 (ja) * 2015-03-18 2019-02-20 日立金属株式会社 鋳造装置および鋳造方法
NO341337B1 (en) * 2015-07-03 2017-10-16 Norsk Hydro As Equipment for continuous or semi-continuous casting of metal with improved metal filling arrangement
CN105499551A (zh) * 2016-02-16 2016-04-20 山东远大特材科技股份有限公司 一种封闭式浇注包及其使用方法
CN105771808A (zh) * 2016-03-02 2016-07-20 昆明安厦新材料科技有限公司 一种固体原料液化装置及工艺流程
CA3030177A1 (en) * 2016-07-28 2018-02-01 Arconic Inc. Two stage melting and casting system and method
CN106148782B (zh) * 2016-08-31 2017-12-01 河钢股份有限公司 一种真空感应炉冶炼锰铜合金的方法
CN110144472B (zh) * 2019-04-30 2020-08-07 中国科学院合肥物质科学研究院 一种锰铜减振合金的真空感应熔炼方法
CN110508768A (zh) * 2019-09-25 2019-11-29 珠海大华新材料有限公司 一种高性能铜合金铸锭的制备方法
CN110947938A (zh) * 2020-02-26 2020-04-03 莱州润昇石油设备有限公司 真空热壳浇铸装置及工作方法
WO2022029300A1 (de) * 2020-08-06 2022-02-10 Sms Group Gmbh VAKUUM-INDUKTIONS-GIEßEINRICHTUNG ZUM GIEßEN VON METALL UND METALLLEGIERUNGEN UNTER VAKUUM UND/ODER SCHUTZGASATMOSPHÄRE SOWIE VERFAHREN ZUM WECHSELN EINER STOPFENSTANGE UND/ODER EINES VERSCHLUSSKÖRPERS EINER STOPFENGIEßVORRICHTUNG AN EINER VAKUUM-INDUKTIONS-GIEßEINRICHTUNG
DE102021001936A1 (de) * 2020-11-10 2022-05-12 Franco Procacciante Vorrichtung zum Schmelzen, Verwendung und Verfahren
CN114346190B (zh) * 2021-12-27 2022-09-30 中南大学 一种合金制造设备与铜基复合材料制备方法
CN117824356B (zh) * 2024-03-05 2024-05-14 金昌镍都矿山实业有限公司 一种纯铜熔炼炉及其除杂工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE356914B (de) * 1969-04-15 1973-06-12 Voest Ag
SE384805B (sv) * 1971-06-03 1976-05-24 I Properzi Forfarande och anordning for avgasning och overforing av smelt metall
DE2501603B2 (de) * 1975-01-16 1977-08-25 Institut problem htja Akademn Nauk Ukrainskoj SSR, Kiew (Sowjetunion) Einrichtung zur vakuumbehandlung fluessiger metalle
JPS60106648A (ja) 1983-11-11 1985-06-12 Mitsubishi Metal Corp 鋳造炉
JPH0620618B2 (ja) * 1985-03-26 1994-03-23 日立電線株式会社 連続鋳造方法及びその装置
JPH0631398A (ja) * 1992-07-13 1994-02-08 Kobe Steel Ltd 活性金属含有銅合金の製造方法
US5421562A (en) * 1994-04-28 1995-06-06 General Motors Corporation Gas-shielded siphonic valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8030082B2 (en) 2006-01-13 2011-10-04 Honeywell International Inc. Liquid-particle analysis of metal materials
IT202200006914A1 (it) * 2022-04-07 2023-10-07 Danieli Off Mecc Dispositivo di carica rottame per caricare rottame in un crogiolo di un apparato di fusione sottovuoto
WO2023194520A1 (en) * 2022-04-07 2023-10-12 Danieli & C. Officine Meccaniche S.P.A. Scrap charging device for charging scrap in a crucible of a vacuum melting apparatus

Also Published As

Publication number Publication date
JPH08120357A (ja) 1996-05-14
EP0717119A3 (de) 1996-08-21
DE69520779T2 (de) 2001-08-09
EP0717119A2 (de) 1996-06-19
DE69520779D1 (de) 2001-05-31
JP3003914B2 (ja) 2000-01-31

Similar Documents

Publication Publication Date Title
EP0717119B1 (de) Verfahren zur Herstellung von einer aktiven metallenthaltenden Kupferlegierung
EP0095645B2 (de) Verfahren und Vorrichtung zum Schmelzen und Giessen von Metall
US4248630A (en) Method of adding alloy additions in melting aluminum base alloys for ingot casting
US9707621B2 (en) System for metal atomisation and method for atomising metal powder
EP0697577B1 (de) Induktionsofen zum Vakuumschmelzen und Druckgiessen
RU2530578C2 (ru) Гибкая система электрической дуговой печи с минимальным потреблением энергии и способы получения стальных продуктов
US20090133850A1 (en) Systems for centrifugally casting highly reactive titanium metals
US5913353A (en) Process for casting light metals
EP1225236B1 (de) Verfahren und vorrichtung zur kontinuierlichen vakuumreinigung von flüssigem metall
JPH04504981A (ja) 反応性合金の誘導スカル紡糸
GB2270145A (en) Induction melting and casting furnace
EP0209593B1 (de) Stranggussverfahren
US3700026A (en) Ingot casting apparatus
US4971294A (en) Induction heated sliding gate valve for vacuum melting furnace
JP2794654B2 (ja) 真空溶解・加圧注湯兼用誘導炉の運転方法
EP3941657B1 (de) Verfahren zur herstellung eines stahlbarrens
JPH0350619B2 (de)
RU2573283C1 (ru) Способ производства металлургических заготовок, фасонного литья и устройство для его осуществления
WO2024113103A1 (zh) 一种洁净均质化特大钢锭的熔炼装置及使用方法
JPH0970656A (ja) 金属・合金鋳塊の製造方法
CN115808079A (zh) 一种真空炉用无落差暗流浇铸的方法及设备
CN111424244A (zh) 靶材的铜合金背板的制作方法
JPH07113581A (ja) 誘導加熱溶解装置
JPS6156228A (ja) 溶融金属の脱ガス方法
GB1584141A (en) Method and apparatus for casting in a thin-walled mould

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE

17P Request for examination filed

Effective date: 19960829

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NIPPON MINING & METALS CO., LTD.

17Q First examination report despatched

Effective date: 19981218

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE

REF Corresponds to:

Ref document number: 69520779

Country of ref document: DE

Date of ref document: 20010531

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20031103

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050503