EP0570303A1 - Stranggiessverfahren unter Verhinderung von Rissbildung in einem Kokillen-Aufsatz - Google Patents

Stranggiessverfahren unter Verhinderung von Rissbildung in einem Kokillen-Aufsatz Download PDF

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Publication number
EP0570303A1
EP0570303A1 EP93420158A EP93420158A EP0570303A1 EP 0570303 A1 EP0570303 A1 EP 0570303A1 EP 93420158 A EP93420158 A EP 93420158A EP 93420158 A EP93420158 A EP 93420158A EP 0570303 A1 EP0570303 A1 EP 0570303A1
Authority
EP
European Patent Office
Prior art keywords
casting
extension
hooping
mold
billets
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.)
Withdrawn
Application number
EP93420158A
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English (en)
French (fr)
Inventor
Laurent Jouet-Pastre
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.)
Rio Tinto France SAS
Original Assignee
Aluminium Pechiney SA
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 Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Publication of EP0570303A1 publication Critical patent/EP0570303A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/049—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for direct chill casting, e.g. electromagnetic casting
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0401—Moulds provided with a feed head

Definitions

  • the present invention relates to a load casting process making it possible to avoid cracking of the riser.
  • This extension is fixed securely and tightly to the mold in order to avoid any leakage of liquid metal; it can be composed of one or more parts and has a rectangular section in the case of plate casting or circular in the case of billet casting.
  • asbestos fibers were used in the past which allowed effective reinforcement but, for hygienic reasons, this material was abandoned.
  • the invention consists of a process for casting aluminum and its alloys in the form of plates or billets in an ingot mold surmounted by an extension of refractory material characterized in that, in order to avoid cracking of the said enhancement, it is applied to it, before casting, a compression preload perpendicular to the casting axis, independent of the clamping forces on the mold, said preload being obtained by controlled peripheral hooping.
  • the effect of the prestressing must have the effect of adding a compressive force to the service constraints and obtaining in total high values in compression and low in tension.
  • the field of Appropriate preload is obtained by exerting a peripheral constraint around the riser.
  • This slit is necessarily very fine to prevent the liquid metal from infiltrating. Its thickness is between 0.05 and 0.7 mm and varies inversely with the metallostatic charge height.
  • the slit is either continuous, with the refractory ring overhanging above, or intermittent, cut from time to time by the support points of the refractory ring.
  • the means finally selected is therefore a peripheral hooping of the extension on a face perpendicular to the support plane of the extension on the ingot mold so as to exert only forces perpendicular to the casting axis.
  • the forces exerted are controlled, and this is essential for, thanks to the prestresses, to properly position the range of service stresses in the riser relative to the stresses admissible by the material.
  • the hooping is carried out at least on the part of the riser closest to the ingot mold but, it can also be done on more distant parts. Two hooping techniques are used depending on the shape of the cast product.
  • the section of the cast product is circular and the hooping is carried out by means of a rigid metal ring, placed hot in contact with the external surface of the riser, and whose diameter decreases by cooling.
  • This hoop is generally made of steel and its internal diameter D1 is smaller than the external diameter D2 of the extension.
  • the relative difference between these two diameters (D2-D1) / D1 is between 0.5 / 1000 and 5/1000. It is through this difference that we control the effort exerted.
  • the section In the case of plates, the section is generally rectangular and of much larger dimensions than in the case of billets, and therefore the respect of the dimensions is much more difficult and the accidental deformation of the frets much greater.
  • this hooping technique is also applicable to billets, but is not preferred because it is longer and more delicate to use than that described above.
  • FIG. 1 represents, in a vertical axial section, a casting mold fitted with a hooped extension.
  • An alloy of the type 7175 was poured according to the standards of the Aluminum Association in the form of plates with dimensions 1300 x 446 mm in an ingot mold whose lower part of the extension was hooped using a strip of width 15 mm and 0.5 mm thick in steel of type XC12F under a tension of 270 daN and closed by a staple.
  • the number of castings without the appearance of cracks being observed was 7 while with an extension of the same non-hooped material used for the same type of casting, the appearance of cracks was observed from the first operation. .
  • the presence of the strip made it possible to continue the operations without any difficulty after the appearance of cracks up to a total of 34 flows; the cracks remaining well closed thanks to the pressure exerted by the strip.
  • the invention finds its application in the casting of aluminum and its alloys whether in the form of plates or billets and whatever the type of material used, that is to say that it implements a injection of gas and / or oil or not.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP93420158A 1992-04-16 1993-04-14 Stranggiessverfahren unter Verhinderung von Rissbildung in einem Kokillen-Aufsatz Withdrawn EP0570303A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9204968A FR2690099B1 (fr) 1992-04-16 1992-04-16 Procede de coulee en charge permettant d'eviter la fissuration de la rehausse.
FR9204968 1992-04-16

Publications (1)

Publication Number Publication Date
EP0570303A1 true EP0570303A1 (de) 1993-11-18

Family

ID=9429154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93420158A Withdrawn EP0570303A1 (de) 1992-04-16 1993-04-14 Stranggiessverfahren unter Verhinderung von Rissbildung in einem Kokillen-Aufsatz

Country Status (2)

Country Link
EP (1) EP0570303A1 (de)
FR (1) FR2690099B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2747061B1 (fr) * 1996-04-05 1998-04-30 Ugine Savoie Sa Lingotiere bi-materiau pour la coulee continue en charge verticale des metaux
FR2764533B1 (fr) 1997-06-12 1999-07-30 Lorraine Laminage Tete de lingotiere pour la coulee continue verticale en charge de produits metalliques a format allonge
BE1012325A3 (fr) * 1998-12-08 2000-09-05 Centre Rech Metallurgique Dispositif pour la coulee continue en charge verticale d'un metal en fusion.
FR3047188B1 (fr) * 2016-01-29 2018-01-12 Constellium Issoire Outillage permettant la fabrication d’un produit en metal par coulee en charge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615471A (en) * 1985-06-19 1986-10-07 M. H. Detrich Refractory plate and method for reinforcing
EP0213049A1 (de) * 1985-07-30 1987-03-04 Aluminium Pechiney Verfahren und Vorrichtung zum Giessen von Metallen
US5020703A (en) * 1990-01-26 1991-06-04 Serusteel, Inc. Stationary top plate for a sliding gate valve and method of manufacture thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5884668A (ja) * 1981-11-16 1983-05-20 Tokyo Yogyo Co Ltd 摺動ノズル盤の補強方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615471A (en) * 1985-06-19 1986-10-07 M. H. Detrich Refractory plate and method for reinforcing
EP0213049A1 (de) * 1985-07-30 1987-03-04 Aluminium Pechiney Verfahren und Vorrichtung zum Giessen von Metallen
US5020703A (en) * 1990-01-26 1991-06-04 Serusteel, Inc. Stationary top plate for a sliding gate valve and method of manufacture thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 183 (M-235)(1328) 12 Août 1983 & JP-A-58 084 668 (TOUKIYOU YOUGIYOU KK) 20 Mai 1983 *

Also Published As

Publication number Publication date
FR2690099B1 (fr) 1997-05-23
FR2690099A1 (fr) 1993-10-22

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