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EP1979113A2 - Cristallisateur - Google Patents

Cristallisateur

Info

Publication number
EP1979113A2
EP1979113A2 EP06819946A EP06819946A EP1979113A2 EP 1979113 A2 EP1979113 A2 EP 1979113A2 EP 06819946 A EP06819946 A EP 06819946A EP 06819946 A EP06819946 A EP 06819946A EP 1979113 A2 EP1979113 A2 EP 1979113A2
Authority
EP
European Patent Office
Prior art keywords
crystallizer
radius
curvature
holes
curved
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Withdrawn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
EP06819946A
Other languages
German (de)
English (en)
Inventor
Nuredin Kapaj
Alfredo Poloni
Gianni Zomero
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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 Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP1979113A2 publication Critical patent/EP1979113A2/fr
Withdrawn legal-status Critical Current

Links

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
    • B22D11/055—Cooling the moulds
    • 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
    • B22D11/043—Curved moulds

Definitions

  • the present invention refers to a curved crystallizer, in particular for the continuous casting of blooms and billets.
  • crystallizers for use with continuous casting plants for blooms or billets are known in the prior art. These crystallizers substantially consist of a hollow monolithic body, usually made of copper, the cross-section of which defines the shape of the cast product.
  • the outer wall of a first type of crystallizer is provided with a jacket through which a cooling fluid flows, said cooling fluid usually consisting of water.
  • crystailizers that incorporate, inside the thickness of their walls, holes through which the cooling water flows. This achieves a better heat transfer while continuing to ensure good crystallizer strength.
  • the main purpose of the present invention is to implement a curved crystallizer for continuous casting of blooms or billets that comprises a suitable cooling system capable of providing an optimum transfer of the heat from the liquid metal inside the curved crystallizer towards the outside.
  • a second purpose is to prevent, thanks to the curvature of the crystallizer, the generation of critical stresses in the cast product as it passes from the crystallizer to the casting machine.
  • Another purpose is to provide a complete casting plant, comprising the crystallizer and casting machine, that is as compact as possible in terms of its height.
  • the present invention achieves the purposes described above with a curved crystallizer for continuous casting of blooms or billets that, in accordance with that set forth in claim 1 , comprises a tubular structure, having a curved longitudinal axis that defines a first radius of curvature, the cross-section of which on a plane orthogonal to the longitudinal axis defines the shape of said blooms or billets, said tubular structure comprising between an outer wall and an inside wall longitudinal holes through which a cooling fluid can flow, said holes extending for the entire length of the crystallizer and having a substantially circular cross-section, said inside wall coming into contact with a molten metal, characterized in that said longitudinal holes have a curved longitudinal axis with the same radius of curvature, and in that the value of said first radius of curvature is between 1 and 5 times the value of a second radius of curvature, said second radius being the smallest radius of curvature of the curvilinear sections that constitute a casting machine, arranged immediately downstream of said crystallizer.
  • the crystallizer according to the present invention is provided with longitudinal cooling holes, arranged in the thickness of the walls of the crystallizer, very close to the inside wall of the crystallizer and having a curved shape with a curvature identical to that of the crystallizer; advantageously, said arrangement makes it possible to obtain:
  • Fig. 1 shows a perspective view of a crystallizer according to the invention
  • Fig. 2 schematically shows the curvatures of a crystallizer according to the invention and of a casting machine arranged downstream
  • Figs. 3, 4, 5 show top views of portions of the wall of the crystallizer
  • Fig. 6 shows a longitudinal cross-section of the crystallizer according to the inven- tion.
  • a curved crystallizer is shown, globally indicated by reference numeral 1 , said crystallizer having a quadrangular cross-section.
  • said crystallizer is advantageously provided with a predetermined radius of curvature R 0 so as to optimize the progressive and gradual deformation of the billet, that solidifies inside the crystallizer when it comes into contact with the inside wall 4, so as to guarantee an effective continuity of the line with a casting machine 2 arranged downstream. The generation of critical stresses that may lead to the formation of cracks inside the cast product is thus prevented.
  • cooling holes are provided inside the thickness of the curved crystallizer according to the invention, said cooling holes advantageously having a predetermined radius of curvature that is substantially equal to the radius of curvature R c of said crystallizer.
  • the value of said radius of curvature R c is between 1 and 5 times the value of the main radius R m of the casting machine 2, where the main radius R m is the minimum radius of curvature among the radii of curvature of the various sections that constitute the casting machine 2.
  • the distance "D" of the cooling holes 3 from the inside wall 4 of the crystallizer, over which the solidifying liquid metal flows, is constant along the entire length of the curved crystallizer, said distance being between approximately
  • the diameter "d" of said cooling holes 3 is advantageously chosen from between approximately 8 and 14 mm and their centre-to-centre distance "i" can vary between approximately 12 and 35 mm.
  • a further advantage consists of the fact that the cooling water can be made to flow through these holes 3 in a top-to-bottom direction. This prevents the water from boiling and thus prevents uneven cooling in the meniscus region where the majority of defects in the cast product originate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

Cristallisateur incurvé pour coulage continu de lingots ou billettes comprenant un système de refroidissement permettant d’assurer un transfert optimal de la chaleur du métal liquide à l’intérieur du cristallisateur vers l’extérieur. Le cristallisateur selon la présente invention permet d’empêcher la génération de contraintes critiques dans le produit coulé pendant son passage dudit cristallisateur à la machine de coulage disposée en aval de celui-ci, et également de mettre en œuvre une installation de coulage complète, comprenant le cristallisateur et la machine de coulage, qui est extrêmement compacte en termes de hauteur.
EP06819946A 2005-12-13 2006-12-12 Cristallisateur Withdrawn EP1979113A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20052367 ITMI20052367A1 (it) 2005-12-13 2005-12-13 Cristallizzatore
PCT/EP2006/069582 WO2007068687A2 (fr) 2005-12-13 2006-12-12 Cristallisateur

Publications (1)

Publication Number Publication Date
EP1979113A2 true EP1979113A2 (fr) 2008-10-15

Family

ID=36531892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06819946A Withdrawn EP1979113A2 (fr) 2005-12-13 2006-12-12 Cristallisateur

Country Status (3)

Country Link
EP (1) EP1979113A2 (fr)
IT (1) ITMI20052367A1 (fr)
WO (1) WO2007068687A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109940141A (zh) * 2019-04-25 2019-06-28 芜湖新兴铸管有限责任公司 方坯结晶器在线调整工艺

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102112255B (zh) * 2008-08-06 2014-05-07 Sms西马格股份公司 用于液态金属、特别用于液态钢的连续铸造金属铸型
CN102335729B (zh) * 2011-10-24 2013-01-16 中冶连铸技术工程股份有限公司 双曲线型结晶器铜管

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5823254U (ja) * 1981-07-24 1983-02-14 新日本製鐵株式会社 連続鋳造用円弧鋳型
DE3526736C2 (de) * 1985-07-26 1994-08-25 Kabelmetal Ag Stranggießkokille zum kontinuierlichen Gießen von Metall
IT1310517B1 (it) * 1999-01-13 2002-02-18 Danieli Off Mecc Cristallizzatore per colata continua

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007068687A3 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109940141A (zh) * 2019-04-25 2019-06-28 芜湖新兴铸管有限责任公司 方坯结晶器在线调整工艺

Also Published As

Publication number Publication date
WO2007068687A3 (fr) 2007-08-16
WO2007068687A8 (fr) 2008-06-05
WO2007068687A2 (fr) 2007-06-21
ITMI20052367A1 (it) 2007-06-14

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Legal Events

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

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Effective date: 20111110