EP1020244A1 - Verfahren und Anlage zum vertikalen Schleudergiessen von Walzwerksverbundwalzen - Google Patents

Verfahren und Anlage zum vertikalen Schleudergiessen von Walzwerksverbundwalzen Download PDF

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Publication number
EP1020244A1
EP1020244A1 EP99400089A EP99400089A EP1020244A1 EP 1020244 A1 EP1020244 A1 EP 1020244A1 EP 99400089 A EP99400089 A EP 99400089A EP 99400089 A EP99400089 A EP 99400089A EP 1020244 A1 EP1020244 A1 EP 1020244A1
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EP
European Patent Office
Prior art keywords
envelope
temperature
metal
centrifugal casting
interface
Prior art date
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Application number
EP99400089A
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English (en)
French (fr)
Inventor
Jean-Claude Werquin
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Individual
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Individual
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Publication date
Priority to FR9708973A priority Critical patent/FR2765819B1/fr
Application filed by Individual filed Critical Individual
Priority to EP99400089A priority patent/EP1020244A1/de
Publication of EP1020244A1 publication Critical patent/EP1020244A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • B22D13/026—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis the longitudinal axis being vertical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B22D23/003—Moulding by spraying metal on a surface

Definitions

  • the present invention relates to a method and an installation for vertical centrifugal casting, intended for the production of steel grades high carbon fast and for bimetallic working cylinders or composites intended to equip rolling mills and train finishers hot strip, cold rolling mills, and also long rolling mills especially with wires and bars.
  • the high carbon steels used for the cylinders are limited in their Carbon and Vanadium contents in this is mainly due to the floating phenomenon of hypereutectic VC carbides. These form shortly before the liquidus of the alloy due to the appearance of a nucleation mechanism initiated in particular by the inevitable presence nitrogen and certain metallic impurities.
  • Patent US - 4,116,684 So far only the continuous coating process by casting (Patent US - 4,116,684) made it possible to carry out these two actions at the same time.
  • This gravity flotation is due to a significant difference in density between MC carbide and liquid metal. It can only happen if no solid obstacle, such as an austenite dendrite is not in the path of the carbide MC subjected to the centripetal force.
  • the MC carbide must be hypereutectic in nature. to say that it must form and have sufficient volume before the temperature of the alloy has reached the liquidus. Sufficient centripetal force will be exerted then and overcome the viscosity forces which slow down its migration.
  • this liquid metal When its viscosity has become sufficient due to cooling, this liquid metal gradually reaches the angular speed ⁇ of the rotating mold and then goes up to take its final position 10. It is during this ascent and according to the temperatures reached by the liquid metal that the final structures will become dendritic, equiaxed or mixed.
  • the casting speed of the table is not directly related to the pouring speed of the liquid metal. It depends on the capacity of the lower journal and the change in viscosity of the metal liquid during its journey along the walls of the mold.
  • the present invention first aims to fully control the hydrodynamics of the casting process by avoiding the round trip of the liquid metal, this time avoiding passage through the lower pin.
  • the invention relates to a vertical centrifugal casting process of composite rolling mill rolls, characterized in that pulverized liquid metal supply jets on the internal surface of a cylindrical shell, by means of a neutral gas under pressure, maintaining the internal surface of the envelope or interface, at a temperature close to that of the liquidus of the cast metal.
  • the invention also relates to a vertical centrifugal casting installation, comprising a rotating shell and a metal pouring pipe provided at least one nozzle projecting metal jets, characterized in that it is provided at least one pressurized neutral gas injector above each nozzle, for spraying the or each jet of sheet metal onto the internal surface of the shell then on the internal surface of the envelope or interface.
  • the jets of liquid metal 2 are sprayed individually and directly on the shell 1 by a flat jet injector 13 of argon or another neutral gas at high pressure located above each jet of liquid metal.
  • the gas used is brought to a pressure greater than or equal to 10 bars by a tube 12 and a crown on which the injectors 13 are fixed with a predetermined angular position to orient the sheet of sprayed metal towards the shell.
  • Figure 4 illustrates simply such a device in top view.
  • the active clutch surface of the liquid metal is thus considerably increased by a factor of more than 1000.
  • thermocouple 7 A second advantage of this new casting process according to the invention, is to be able to place between the jets, before pouring the metal, a thermocouple 7. This will allow continuous measurement of the interface temperature. In modulating the flow rate accordingly, it will then be possible to maintain it permanently at the temperature level of the alloy's liquidus.
  • thermocouple Platinum - Rhodium Platinum itself protected by a platinum sheath.
  • This thermocouple 7 is lowered into the table at the same height as in the process traditional.
  • thermocouple obviously makes it possible to measure the temperature of the interface to control the bonding conditions with the material of the core, generally in nodular cast iron, as in the traditional process.
  • thermocouple 7 before and during the casting of the shell alloy is not possible in the process traditional. Indeed, as described in Figure 1, metal splashes liquid 6 occur during the impacts of metal jets against the shell. These splashes would then destroy and instantly neutralize the thermocouple.
  • a first envelope was poured with the traditional method to a constant casting speed of 2500 kilograms per minute and at a temperature determined by 130 ° C overheating above the liquidus of the alloy previously measured by thermal analysis.
  • the flux was introduced in the form of solid granules at the same time as the liquid metal in the pouring tube 3.
  • This envelope was ⁇ 750 mm from 1700 mm from length and 75 mm thick.
  • a second envelope was poured with the new process of the present invention at a constant casting speed of 1200 kg / min during the first instant solidification period 20 mm thick. Then by successive interrupted flows corresponding to 15 mm then 12 mm then 10 mm, 10 mm and finally 8 mm and at a pouring temperature in the ladle having an overheating of 80 ° C above the liquidus, at the start of casting.
  • thermocouple The temperature was continuously monitored by the thermocouple and each new casting started when the envelope temperature was 10 ° in below the liquidus.
  • a thickness of plaster 4 greater at the top of the table, of approximately 4 mm was used (instead of 2 mm in traditional casting).
  • This envelope was also ⁇ 750mm, from 1700 mm in length and 75 mm in thickness.
  • This third envelope was poured with the new process of the present invention at a constant casting speed of 1500 Kg / min during the first instant solidification period 25 mm thick. Then by successive interrupted flows corresponding to 15 mm then 15mm then 10mm and finally 10mm and at a ladle pouring temperature with overheating 90 ° C above the measured liquidus, at the start of casting.
  • thermocouple The temperature was continuously monitored by the thermocouple and each new casting started when the envelope temperature was a few degrees C (1 to 5 °) below the liquidus.
  • this envelope was ⁇ 550 mm, 1800 mm in length and 75 mm in thickness.
  • a secondary metal thickness of 20 mm was then poured after partial solidification of the envelope, according to the conventional method, in order to simulate the bonding of the two metals. Then after total solidification of this second layer the centrifugation operation was stopped. On examination of this connection at the top of the table, no porosity could be detected on the primary metal side.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP99400089A 1997-07-09 1999-01-14 Verfahren und Anlage zum vertikalen Schleudergiessen von Walzwerksverbundwalzen Withdrawn EP1020244A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9708973A FR2765819B1 (fr) 1997-07-09 1997-07-09 Procede de coulee centrifuge verticale a hydrodynamique amelioree et cylindres de laminage composites, a structure equiaxes, en comportant application
EP99400089A EP1020244A1 (de) 1997-07-09 1999-01-14 Verfahren und Anlage zum vertikalen Schleudergiessen von Walzwerksverbundwalzen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9708973A FR2765819B1 (fr) 1997-07-09 1997-07-09 Procede de coulee centrifuge verticale a hydrodynamique amelioree et cylindres de laminage composites, a structure equiaxes, en comportant application
EP99400089A EP1020244A1 (de) 1997-07-09 1999-01-14 Verfahren und Anlage zum vertikalen Schleudergiessen von Walzwerksverbundwalzen

Publications (1)

Publication Number Publication Date
EP1020244A1 true EP1020244A1 (de) 2000-07-19

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EP99400089A Withdrawn EP1020244A1 (de) 1997-07-09 1999-01-14 Verfahren und Anlage zum vertikalen Schleudergiessen von Walzwerksverbundwalzen

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EP (1) EP1020244A1 (de)
FR (1) FR2765819B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10321391B3 (de) * 2003-05-12 2004-10-14 M. Jürgensen GmbH & Co. KG Verfahren zum Schleuderguss

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765819B1 (fr) * 1997-07-09 1999-08-27 Jean Claude Werquin Procede de coulee centrifuge verticale a hydrodynamique amelioree et cylindres de laminage composites, a structure equiaxes, en comportant application
FR2800306B1 (fr) * 1999-11-03 2001-12-07 Jean Claude Werquin Nouveau procede de coulee centrifuge verticale pour cylindres de laminoirs permettant d'obtenir une liaison saine et sans porosites entre la couche externe en acier rapide et la fonte nodulaire du coeur

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754593A (en) * 1971-12-06 1973-08-28 Wean United Inc Centrifugal casting of bi-metal rolls
US3826301A (en) * 1971-10-26 1974-07-30 R Brooks Method and apparatus for manufacturing precision articles from molten articles
US4116684A (en) * 1976-03-17 1978-09-26 Hitachi Metals, Ltd. High speed tool steel having high toughness
JPS5813462A (ja) * 1981-07-15 1983-01-25 Hitachi Ltd 鉄心製造方法及び装置
FR2625226A1 (fr) * 1987-12-23 1989-06-30 Chavanne Ketin Cylindre de travail composite bimetallique
JPH01254363A (ja) * 1988-04-05 1989-10-11 Kawasaki Steel Corp 圧延用ロールの製造方法
EP0322300B1 (de) * 1987-12-23 1993-09-08 Forcast International Stützwalze aus Verbundbimetall zum Warmwalzen
EP0698670A1 (de) * 1994-06-29 1996-02-28 Kawasaki Steel Corporation Material für die Aussenschicht einer Warmumformwalze und Verfahren zur Herstellung einer Warmumformwalze
EP0560210B1 (de) * 1992-03-06 1996-12-18 Hitachi Metals, Ltd. Verbundwalze und Verfahren zu ihrer Herstellung
EP0559899B1 (de) * 1991-09-12 1998-11-04 Kawasaki Steel Corporation Kompositwalze, hergestellt durch schleuderguss und äussere schicht dieser walze
FR2765819A1 (fr) * 1997-07-09 1999-01-15 Werquin Jean C Procede de coulee centrifuge verticale a hydrodynamique amelioree et cylindres de laminage composites, a structure equiaxes, en comportant application

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE677020C (de) * 1935-12-06 1939-06-16 Friedrich Littner Dr Ing Verfahren zum Herstellen von Schleudergusshohlkoerpern
GB1364235A (en) * 1970-06-16 1974-08-21 Apv Paramount Ltd Process for making tool steels or alloys as part of the manufactu re of a cutting tool
JPS5852459B2 (ja) * 1979-09-12 1983-11-22 株式会社クボタ 両鍔パイプの製造法
JPS59202154A (ja) * 1983-05-04 1984-11-15 Hitachi Ltd 金属管の製造法
JPH0381091A (ja) * 1989-08-24 1991-04-05 Kubota Corp 熱間圧延用溶接肉盛ロール

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826301A (en) * 1971-10-26 1974-07-30 R Brooks Method and apparatus for manufacturing precision articles from molten articles
US3754593A (en) * 1971-12-06 1973-08-28 Wean United Inc Centrifugal casting of bi-metal rolls
US4116684A (en) * 1976-03-17 1978-09-26 Hitachi Metals, Ltd. High speed tool steel having high toughness
JPS5813462A (ja) * 1981-07-15 1983-01-25 Hitachi Ltd 鉄心製造方法及び装置
FR2625226A1 (fr) * 1987-12-23 1989-06-30 Chavanne Ketin Cylindre de travail composite bimetallique
EP0322300B1 (de) * 1987-12-23 1993-09-08 Forcast International Stützwalze aus Verbundbimetall zum Warmwalzen
JPH01254363A (ja) * 1988-04-05 1989-10-11 Kawasaki Steel Corp 圧延用ロールの製造方法
EP0559899B1 (de) * 1991-09-12 1998-11-04 Kawasaki Steel Corporation Kompositwalze, hergestellt durch schleuderguss und äussere schicht dieser walze
EP0560210B1 (de) * 1992-03-06 1996-12-18 Hitachi Metals, Ltd. Verbundwalze und Verfahren zu ihrer Herstellung
EP0698670A1 (de) * 1994-06-29 1996-02-28 Kawasaki Steel Corporation Material für die Aussenschicht einer Warmumformwalze und Verfahren zur Herstellung einer Warmumformwalze
FR2765819A1 (fr) * 1997-07-09 1999-01-15 Werquin Jean C Procede de coulee centrifuge verticale a hydrodynamique amelioree et cylindres de laminage composites, a structure equiaxes, en comportant application

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
N.N.: "SPRAY STEEL MAKES HIGH QUALITY TOOL STEEL", STEEL TIMES - INCORPORATING IRON & STEEL, vol. 217, no. 1, 1 January 1989 (1989-01-01), Redhill, Surrey, GB, pages 32, XP000007338 *
PATENT ABSTRACTS OF JAPAN vol. 007, no. 089 (M - 207) 13 April 1983 (1983-04-13) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 006 (M - 916) 9 January 1989 (1989-01-09) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10321391B3 (de) * 2003-05-12 2004-10-14 M. Jürgensen GmbH & Co. KG Verfahren zum Schleuderguss

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Publication number Publication date
FR2765819B1 (fr) 1999-08-27
FR2765819A1 (fr) 1999-01-15

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