EP2490842A1 - Verfahren zur herstellung eines metallblocks mit einer bohrung sowie entsprechender metallblock und pressform - Google Patents

Verfahren zur herstellung eines metallblocks mit einer bohrung sowie entsprechender metallblock und pressform

Info

Publication number
EP2490842A1
EP2490842A1 EP09768538A EP09768538A EP2490842A1 EP 2490842 A1 EP2490842 A1 EP 2490842A1 EP 09768538 A EP09768538 A EP 09768538A EP 09768538 A EP09768538 A EP 09768538A EP 2490842 A1 EP2490842 A1 EP 2490842A1
Authority
EP
European Patent Office
Prior art keywords
mold
liquid metal
receiving
ingot
steel
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
EP09768538A
Other languages
English (en)
French (fr)
Other versions
EP2490842B1 (de
Inventor
Thierry Faudan
Jean-Luc Dabin
Gilbert Lacagne
Maxime Leroy
Bruno Savalli
Franck Braconnier
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.)
ArcelorMittal Investigacion y Desarrollo SL
Original Assignee
ArcelorMittal Investigacion y Desarrollo SL
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 ArcelorMittal Investigacion y Desarrollo SL filed Critical ArcelorMittal Investigacion y Desarrollo SL
Priority to PL09768538T priority Critical patent/PL2490842T3/pl
Priority to SI200930846T priority patent/SI2490842T1/sl
Publication of EP2490842A1 publication Critical patent/EP2490842A1/de
Application granted granted Critical
Publication of EP2490842B1 publication Critical patent/EP2490842B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/04—Casting hollow ingots

Definitions

  • the present invention relates to the manufacture of a metal ingot having a longitudinal bore and in particular a steel ingot for producing forged annular parts.
  • ingots which are either solid ingots, which must then be the object of a forging operation having the drilling of an axial hole, the direct casting of ingots having a central bore which can be transformed directly in the form of ferrule.
  • the solid ingots can be cast under vacuum, which allows them to be made of steel which was degassed at the time of vacuum casting, to obtain guaranteed hydrogen contents of less than 1 ppm.
  • ingots having a central bore are cast in air source. These ingots are cast using metal or liquid steel which has been degassed during the pocket metallurgy operations, and which generally have a guaranteed hydrogen content of less than 1.5 ppm.
  • the steel takes up a quantity of hydrogen of the order of 0.3 ppm, it is therefore difficult to obtain ingots which can be guaranteed, when the steel is in the liquid state in the mold, a hydrogen content of less than 1, 8 ppm.
  • solid ingots although having a low hydrogen content and therefore do not require degassing treatments, require a more complicated forging process. Indeed, this process must include at least one step for making a central hole that requires several forging and reheating operations in furnaces.
  • An object of the present invention is to overcome these disadvantages by providing a means for obtaining forging ingots having a longitudinal bore, while having a sufficiently low hydrogen content from the beginning, in order to be able to guarantee conditions of hydrogen content. low on the finished parts, without many thermal degassing treatments being necessary.
  • the subject of the invention is a method for producing a metal ingot having a longitudinal bore, by casting of liquid metal in a mold comprising a generally annular molding cavity, defined by an ingot mold extending vertically above the mold. a support, the mold having an upwardly open cavity, a vertical core disposed within the cavity of the mold, and a bottom.
  • the mold is disposed inside a vacuum casting chamber comprising, at its upper part, a means for introducing liquid metal;
  • a means for receiving and distributing liquid metal adapted to receive the liquid steel introduced into the vacuum casting chamber and for redistributing the liquid metal in the molding cavity, is disposed at the upper part of the molding cavity; , and:
  • the liquid metal is introduced into the vacuum casting chamber so as to form a first liquid steel jet under vacuum to discharge the liquid metal onto the receiving and distributing means and forming at least a second vacuum liquid steel jet from the receiving and distributing means and terminating in the molding cavity so as to flow the liquid metal into the molding cavity.
  • the liquid metal receiving and distribution means is a cup-shaped distributor comprising at least one evacuation channel, opening into the mold cavity.
  • the evacuation channel can have different shapes (tube, elbow .%) and different positions (horizontal, inclined %)
  • the means for receiving and distributing the liquid metal is a cone made of refractory material whose tip is adapted to receive the first jet of liquid steel;
  • the means for receiving and distributing the liquid metal bears on the upper end of the core
  • the core consists of a generally cylindrical body of refractory material comprising a metal axial reinforcement
  • the armature of the core is a metal tube, for example steel, whose wall comprises a plurality of holes;
  • the mold is generally of revolution
  • the liquid metal is liquid steel
  • the pressure in the vacuum chamber is less than 0.2 Torr.
  • the invention further relates to a steel ingot comprising a longitudinal bore has been obtained by vacuum casting.
  • the ingot may for example have a generally rotational shape.
  • the ingot may have a hydrogen content of less than 1.2 ppm, preferably less than or equal to 1 ppm and more preferably less than or equal to 0.8 ppm.
  • the invention also relates to an apparatus for vacuum casting a metal ingot comprising a longitudinal bore, comprising a molding cavity defined by:
  • the means for receiving and distributing the liquid metal is a dish-shaped distributor comprising at least one evacuation channel opening into the molding cavity;
  • the means for receiving and distributing the liquid metal is a cone made of refractory material whose tip is adapted to receive the first liquid steel jet.
  • FIG. 1 shows in section a vacuum casting installation of a metal ingot having a longitudinal bore
  • FIG. 2 is a top view of an ingot mold for casting an ingot having a longitudinal bore provided with means for receiving and distributing the liquid metal;
  • FIG. 3 is a diagrammatic representation in section of a second embodiment of a liquid metal distribution device at the top of the ingot casting mold having a longitudinal bore;
  • FIG. 4 is an enlarged exploded view of the liquid metal receiving and distribution device shown in FIG.
  • Figure 1 there is shown an installation for vacuum casting a metal ingot, and in particular a steel ingot, generally of a shape of revolution and having a longitudinal central bore.
  • This installation comprises a mold 1 intended to mold the metal ingot, consisting of a cast iron mold 2 known in itself which delimits a cavity 3 inside which is disposed a vertical core 4.
  • the whole is arranged in a vacuum casting chamber 5 consisting of a tank 6 closed by a cover 8 having a pipe 7 pumping connected to a pump installation not shown.
  • the cover 8 has a means 9 introduction of the liquid metal inside the vacuum chamber which consists of an intermediate bag 10 closed by a drawer nozzle 1 1 disposed at the junction between the intermediate bag 10 and the vacuum chamber 5.
  • Such a vacuum casting installation is known in itself and it makes it possible to pour liquid metal and in particular steel which is first poured into the intermediate bag 10, then which can be penetrated into the vacuum chamber 5 by opening the drawer nozzle 1 1 without breaking the vacuum.
  • the mold 1 rests on a wedge 17 whose height is adapted so that the mold is completely disposed inside the vacuum casting chamber 5, which vacuum casting chamber 5 rests under the ground 16.
  • the mold 1 comprises a bottom marked generally by 27 comprising a wedging means 18 and a cast iron counterplate 20.
  • the bottom is adapted to obtain the desired ingot height.
  • the wedging means is for example cast iron.
  • the space between the wedging means and the side wall of the mold is filled with dry sand 19.
  • the counterplate cast iron 20 for receiving the lower portion of the vertical core 4 is surrounded by chromite gaskets.
  • the mold 2, the core 4 and the bottom 27 define a generally annular mold cavity 3A intended to receive the liquid metal.
  • the vertical core 4 of generally cylindrical shape, is constituted, in its outer part, chromite surrounding a metal frame consisting of a steel tube 42 extending over the entire height and whose wall may optionally have holes.
  • This metal reinforcement is intended on the one hand, to ensure the rigidity and strength of the vertical core 4 and on the other hand, to form a chimney through which can evacuate the gases resulting from degassing of the chromite core.
  • the chromite core may advantageously be coated with a refractory lining based on zirconium silicate or any equivalent product.
  • grinding plates 22 are arranged on the inner wall of the mold and on the wall external of the kernel. Such massaging slabs are known per se to those skilled in the art.
  • a means 1 1 A for receiving and distributing the liquid steel which is introduced into the vacuum chamber is disposed at the upper part of the mold.
  • This means 1 1 A for receiving and distributing liquids is constituted by a tray-shaped distributor 12 consisting of tabular alumina, which comprises at its periphery channels 13 opening vertically above the molding cavity 3A.
  • the channels 13 are intended to drive the liquid steel which is contained inside the distributor 12 in the molding cavity 3A.
  • These channels 13 are of refractory material and are contained in housings 14 filled with sand. They rest on a support plate 15 which bears on the upper part of the vertical core 4 and on the upper face of the mold 2.
  • the distributor 12 comprises an inner bowl 121 from which four channels 13 are located which are contained in four holding boxes containing sand 14 and which are supported by the arms 122 of the support plate 15. These arms 122, which are arranged in a cross, rest on the top of the mold 2.
  • the mold 1 comprises massaging plates 22 which surround a on the other hand, the mold 2.
  • massing plates 22 are known in themselves to those skilled in the art.
  • the vacuum casting chamber 5 is evacuated by pumping through the pipe 7 using a vacuum pumping installation known in itself. Even of the skilled person. Thus, the pressure of the atmosphere within the vacuum chamber 5 is lowered to a value that can fall below 0.5 Torr, and better below 0.2 Torr, and better still below 0, 1 Torr.
  • the vacuum is achieved in the enclosure, there is a steel pocket above the intermediate pocket 10, it pours liquid steel in the pocket intermediate 10.
  • the intermediate bag 10 is sufficiently filled with steel, it opens the drawer nozzle 1 1, which allows to introduce liquid steel inside the vacuum chamber 5.
  • This liquid steel forms a first jet 50 which forms a reserve 51 of liquid steel in the bowl 121 of the distributor 12.
  • the reserve 51 of liquid steel then flows through the channels 13 to form secondary jets 52 which introduce liquid steel inside the molding cavity 3A and which gradually fill this molding cavity 3 forming a volume of liquid steel 53 inside the molding cavity 3A.
  • an ingot may be obtained having a longitudinal bore which, when still in the liquid state inside the mold, may have a hydrogen content substantially less than 0.8 ppm.
  • it may however start from a liquid steel having a hydrogen content greater than 1.5 ppm, while still obtaining an ingot whose hydrogen content will be substantially less than 0.8 ppm.
  • the molding cavity 3A filled with liquid steel it proceeds in a known manner by allowing the ingot to solidify inside the vacuum casting chamber 5.
  • the vacuum casting chamber 5 can then be opened by removing the cover 8, then removing the receiving and distributing means 11, and then demolding the ingot in a manner known in itself to the man of the job.
  • a metal ingot in particular a steel ingot, and in particular low alloy steel, having high metal properties, which can be used to manufacture forgings for heavy equipment, such as plant vessels, is obtained.
  • the ingot has a very low hydrogen content, which can be guaranteed less than 1, 2 ppm and even less than 1 ppm, and better still, possibly lower than 0.8 ppm.
  • the means 1 1 A for receiving and distributing the liquid metal consists of a distributor 12 comprising a bowl and which bears on the central core 4.
  • a distributor 12 comprising a bowl and which bears on the central core 4.
  • Other modes of realization are possible, the main thing being to achieve at least the formation of two successive streams of liquid metal, under vacuum, which can burst so as to provide two successive degassing operations.
  • FIG 3 there is shown another possible embodiment in which the mold 2 is surmounted by a receiving means and distribution 1 1 'of the jet 50 of liquid metal which is introduced into the vacuum casting chamber.
  • This means 1 1 ' is constituted by a cone 1 10 bearing on the central core 4.
  • the liquid metal which comes from the jet 50 flows on an area 51' which is on the outer periphery of the cone 1 10, and then opens into the molding cavity 3A forming jets 52 'which are exploded and which can ensure a very good degassing.
  • FIG. 4 the cone 1 10 of the liquid steel receiving and distribution means is shown, which is completed by a U-shaped rider 1 1 1 which is intended to hold the cone 1 10.
  • the mold may consist of several assembled segments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Continuous Casting (AREA)
EP09768538.2A 2009-10-21 2009-10-21 Verfahren zur herstellung eines metallblocks mit einer bohrung sowie entsprechender metallblock und pressform Not-in-force EP2490842B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL09768538T PL2490842T3 (pl) 2009-10-21 2009-10-21 Sposób wytwarzania metalowego wlewka zawierającego otwór, odpowiedni wlewek i urządzenie do odlewania
SI200930846T SI2490842T1 (sl) 2009-10-21 2009-10-21 Postopek izdelave kovinskega ingota, obsegajočega luknjo, tovrsten ingot in livarska priprava za izdelavo

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR2009/052014 WO2011048279A1 (fr) 2009-10-21 2009-10-21 Procede pour fabriquer un lingot metallique comportant un alesage, lingot et dispositif de moulage associes

Publications (2)

Publication Number Publication Date
EP2490842A1 true EP2490842A1 (de) 2012-08-29
EP2490842B1 EP2490842B1 (de) 2013-12-11

Family

ID=42497515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09768538.2A Not-in-force EP2490842B1 (de) 2009-10-21 2009-10-21 Verfahren zur herstellung eines metallblocks mit einer bohrung sowie entsprechender metallblock und pressform

Country Status (13)

Country Link
US (2) US8875776B2 (de)
EP (1) EP2490842B1 (de)
JP (1) JP5552170B2 (de)
KR (1) KR101443469B1 (de)
CN (1) CN102655965B (de)
BR (1) BR112012009542A2 (de)
CA (1) CA2778193C (de)
ES (1) ES2448547T3 (de)
PL (1) PL2490842T3 (de)
RU (1) RU2526649C2 (de)
SI (1) SI2490842T1 (de)
UA (1) UA104222C2 (de)
WO (1) WO2011048279A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112012009542A2 (pt) * 2009-10-21 2020-08-18 Arcelormittal Investigación Y Desarollo Sl processo para fabricar um lingote metálico, lingote de aço e dispositivo de moldagem
CN104275450B (zh) * 2014-10-11 2016-05-18 清华大学 一种底注式浇注铸锭的方法及专用装置
CN104785757B (zh) * 2015-03-27 2016-11-30 辽宁科技大学 一种多芯还原多包共浇复合浇铸大型钢锭的方法及装置

Family Cites Families (17)

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Publication number Priority date Publication date Assignee Title
US3310850A (en) * 1963-12-13 1967-03-28 Rheinstahl Huettenwerke Ag Method and apparatus for degassing and casting metals in a vacuum
JPS5028898B1 (de) * 1970-01-20 1975-09-19
JPS5638295B2 (de) * 1974-05-01 1981-09-05
US4278124A (en) 1978-04-11 1981-07-14 Kawasaki Steel Corporation Method of producing hollow steel ingot and apparatus therefor
JPS54134034A (en) * 1978-04-11 1979-10-18 Kawasaki Steel Co Production of hollow steel block
JPS54143703A (en) * 1978-04-28 1979-11-09 Kobe Steel Ltd Vacuum induction melting apparauts
JPS5633164A (en) * 1979-08-22 1981-04-03 Mitsubishi Steel Mfg Co Ltd Manufacture of steel ingot by remelting
SU1088868A1 (ru) * 1983-02-14 1984-04-30 Предприятие П/Я А-3681 Способ получени полого слитка
SU1359062A1 (ru) * 1986-05-05 1987-12-15 Волгоградский Политехнический Институт Устройство дл получени полых слитков
US5052469A (en) * 1988-09-20 1991-10-01 Showa Denko Kabushiki Kaisha Method for continuous casting of a hollow metallic ingot and apparatus therefor
FR2676670B1 (fr) * 1991-05-23 1996-01-05 Creusot Loire Procede et dispositif de coulee d'un lingot creux metallique.
FR2676671B1 (fr) * 1991-05-23 1994-01-14 Creusot Loire Industrie Procede et dispositif de coulee d'un lingot creux utilisant un noyau refroidi de maniere reglable.
JPH05318027A (ja) * 1992-05-25 1993-12-03 Kobe Steel Ltd 鋳造方法
JPH06190538A (ja) * 1992-12-24 1994-07-12 Hitachi Ltd 低水素鋼塊の製造方法
JP4427439B2 (ja) * 2004-12-02 2010-03-10 株式会社神戸製鋼所 中空状の鍛造用鋼材の製法および筒状鍛造品の製法
JP4443430B2 (ja) * 2005-01-25 2010-03-31 東邦チタニウム株式会社 電子ビーム溶解装置
BR112012009542A2 (pt) * 2009-10-21 2020-08-18 Arcelormittal Investigación Y Desarollo Sl processo para fabricar um lingote metálico, lingote de aço e dispositivo de moldagem

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
EP2490842B1 (de) 2013-12-11
CA2778193C (fr) 2014-10-14
ES2448547T3 (es) 2014-03-14
CN102655965B (zh) 2016-02-24
US20150013931A1 (en) 2015-01-15
JP5552170B2 (ja) 2014-07-16
CA2778193A1 (fr) 2011-04-28
SI2490842T1 (sl) 2014-03-31
KR101443469B1 (ko) 2014-10-14
RU2526649C2 (ru) 2014-08-27
CN102655965A (zh) 2012-09-05
JP2013508162A (ja) 2013-03-07
PL2490842T3 (pl) 2014-05-30
BR112012009542A2 (pt) 2020-08-18
US8875776B2 (en) 2014-11-04
WO2011048279A1 (fr) 2011-04-28
US20120269672A1 (en) 2012-10-25
US9586258B2 (en) 2017-03-07
UA104222C2 (ru) 2014-01-10
KR20120080637A (ko) 2012-07-17
RU2012120723A (ru) 2013-11-27

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