EP0541471B1 - Procédé de fabrication de billettes d'acier de format quadrangulaire et billettes ainsi obtenues - Google Patents

Procédé de fabrication de billettes d'acier de format quadrangulaire et billettes ainsi obtenues Download PDF

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Publication number
EP0541471B1
EP0541471B1 EP92470029A EP92470029A EP0541471B1 EP 0541471 B1 EP0541471 B1 EP 0541471B1 EP 92470029 A EP92470029 A EP 92470029A EP 92470029 A EP92470029 A EP 92470029A EP 0541471 B1 EP0541471 B1 EP 0541471B1
Authority
EP
European Patent Office
Prior art keywords
slabs
billet
billets
radius
square
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
EP92470029A
Other languages
German (de)
English (en)
Other versions
EP0541471A1 (fr
Inventor
Roger Rossi
Claude Orsucci
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.)
Unimetal SA
Original Assignee
UNIMETALL SA
Unimetal 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 UNIMETALL SA, Unimetal SA filed Critical UNIMETALL SA
Publication of EP0541471A1 publication Critical patent/EP0541471A1/fr
Application granted granted Critical
Publication of EP0541471B1 publication Critical patent/EP0541471B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/026—Rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting

Definitions

  • the present invention relates to a process for forging a piece of revolution from steel billets.
  • the invention aims to solve this dilemma.
  • the invention relates to a method according to claim 1.
  • Such a semi-finished product is very similar to round bars and therefore no longer requires, at the forge, a complete pre-forging like conventional square billets.
  • the invention thus makes it possible to extend, almost without cost, to round products the usual production range of quadrangular formats.
  • the billets to be laminated according to the invention can of course be obtained by continuous casting in the state of blooms.
  • the single figure is a sectional view, on a reduced scale, of a billet according to the invention.
  • the billet 1 shown in the drawing is made from a square bloom from a continuous casting machine, then laminated into a billet until each side has a length c, and the four edges are rounded according to a rounding 2 having a radius r of between substantially 0.25c and 0.33c.
  • the process targeted by the invention therefore makes it possible to obtain rounded billets, of a lower cost price than round bars, and which nevertheless can be used by blacksmiths by avoiding certain preforging operations, or even by completely replacing the round products in some applications.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Forging (AREA)
  • Steering Devices For Bicycles And Motorcycles (AREA)
  • Mechanical Control Devices (AREA)
  • Attitude Control For Articles On Conveyors (AREA)

Description

  • La présente invention concerne un procédé de forgeage de pièce de revolution à partir de billettes en acier.
  • On sait que les demi-produits sidérurgiques destinés à la forge sont en général ronds, ou quadrangulaires et dans ce cas généralement de section carrée. Certains de ces demi-produits peuvent ultérieurement être travaillés à la forge pour en faire des produits finis prêts à l'emploi. Les forgerons ont donc en fait à choisir entre deux types de demi-produits :
    • soit des barres rondes, qui présentent l'avantage d'être prêtes à l'emploi à la forge pour la fabrication de pièces de révolution, mais par contre sont relativement onéreuses à l'achat:
    • soit des billettes carrées, plus économiques à l'achat, mais qui doivent être préforgées pour se rapprocher le plus possible d'un rond.
  • Par ailleurs, le laminage de barres rondes directement sur les sites de production de billettes carrées soulève des difficultés, en raison des investissements supplémentaires nécessaires à cette fabrication et à la manutention des barres, investissements considérés d'ailleurs comme lourds pour une production somme toute marginale dans une gamme existante large de produits quadrangulaires.
  • L'invention a pour but de résoudre ce dilemme.
  • A cet effet, l'invention a pour objet un procédé selon la revendication 1.
  • Un tel demi-produit se rapproche notablement des barres rondes et ne nécessite donc plus, à la forge, un préforgeage complet comme les billettes carrées classiques.
  • Elles peuvent de plus dans certains cas se substituer complètement aux barres rondes, et leur prix de revient est largement inférieur à celui de ces dernières.
  • L'invention permet ainsi d'élargir quasiment sans frais vers les produits ronds la gamme de production habituelle des formats quadrangulaires.
  • Les billettes à laminer selon l'invention peuvent bien entendu être obtenues par coulée continue à l'état de blooms.
  • L'invention sera maintenant décrite en référence au dessin annexé qui illustre une forme de réalisation d'une billette selon l'invention.
  • La figure unique est une vue en section, à échelle réduite, d'une billette selon l'invention.
  • La billette 1 représentée au dessin est fabriquée à partir d'un bloom carré issu d'une machine de coulée continue, puis laminé en billette jusqu'à ce que chaque côté présente une longueur c, et que les quatre arêtes soient arrondies selon un arrondi 2 ayant un rayon r compris entre sensiblement 0,25c et 0,33c.
  • A cet effet, on remplace dans les cages de laminage, les cylindres habituels à fond de cannelures à rayon faible par des cylindres à cannelures à fond arrondi, adapté à la courbure que l'on veut obtenir pour les arêtes.
  • Les limites précitées se justifient de la manière suivante : si le rayon r est inférieur à 0,25c, la billette obtenue se rapproche trop des billettes carrées. Les forgerons devraient donc la forger eux-mêmes pour la rapprocher d'une billette ronde. Une telle billette ne présenterait en fait aucun intérêt pour les forgerons.
  • Il convient de rappeler à ce sujet qu'une billette carrée habituelle a en fait des arêtes légèrement arrondies. Ainsi une billette de 100mm de côté a un rayon d'angle de sensiblement 15mm (0,15c).
  • Si par contre le rayon r est supérieur à 0,33c, cela soulèvera une difficulté pour le producteur de billettes, car ces produits arrondis auront trop tendance à rouler plutôt qu'à glisser sur les installations situées en aval du train de laminage. Or sur les lignes de production de billettes carrées, celles-ci doivent pouvoir glisser, en raison de leurs faces planes. Il faudrait donc reconsidérer la conception des outils de manutention, ce qui entraînerait pour les producteurs de billettes des investissements supplémentaires onéreux, qui grèveraient le coût de production des billettes arrondies.
  • Le procédé visé par l'invention permet donc l'obtention de billettes arrondies, de prix de revient moins élevé que les barres rondes, et qui néanmoins peuvent être utilisées par les forgerons en évitant certaines opérations de préforgeage, ou même en se substituant complètement aux produits ronds dans certaines applications.

Claims (3)

  1. Procédé de forgeage de pièce de révolution à partir de billettes en acier, caractérisé en ce que, sur un train de laminage de billettes, on lamine des billettes de format carré ou sensiblement carré, selon un arrondi (2) d'arête ayant un rayon (r) compris entre sensiblement un quart et un tiers de la longeur (c) d'un côté de ladite billette, puis on forge les billettes ainsi obtenues.
  2. Billette d'acier destinée à être forgée, caractérisée en ce qu'elle presente un format sensiblement carré, les quatres arêtes étant arrondies selon un arrondi (2) ayant un rayon (r) compris entre un quart et un tiers de la longeur (c) d'un côté, et en ce qu'elle est obtenue par un opération de laminage selon la Revendication 1.
  3. Billette d'acier selon la Revendication 2, caractérisé en ce qu'elle est obtenue à partir d'un bloom produit par coulée continue.
EP92470029A 1991-11-08 1992-10-23 Procédé de fabrication de billettes d'acier de format quadrangulaire et billettes ainsi obtenues Expired - Lifetime EP0541471B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9113833 1991-11-08
FR9113833A FR2683468B1 (fr) 1991-11-08 1991-11-08 Procede de fabrication de billettes d'acier de format quadrangulaire et billettes ainsi obtenues.

Publications (2)

Publication Number Publication Date
EP0541471A1 EP0541471A1 (fr) 1993-05-12
EP0541471B1 true EP0541471B1 (fr) 1996-06-12

Family

ID=9418779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92470029A Expired - Lifetime EP0541471B1 (fr) 1991-11-08 1992-10-23 Procédé de fabrication de billettes d'acier de format quadrangulaire et billettes ainsi obtenues

Country Status (7)

Country Link
EP (1) EP0541471B1 (fr)
AT (1) ATE139152T1 (fr)
DE (1) DE69211492T2 (fr)
DK (1) DK0541471T3 (fr)
ES (1) ES2089466T3 (fr)
FR (1) FR2683468B1 (fr)
GR (1) GR3020448T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6390905B1 (en) * 2000-03-31 2002-05-21 Speedfam-Ipec Corporation Workpiece carrier with adjustable pressure zones and barriers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1529301A (en) * 1923-04-17 1925-03-10 Diescher & Sons S Manufacture of billets for seamless tubes
FR1489187A (fr) * 1966-06-08 1967-07-21 Perfectionnements dans les produits laminés
DE1909699A1 (de) * 1969-02-26 1970-09-17 Vyzk Ustav Hutnictvi Zeleza Verfahren zur Herstellung von reinem homogenem Metall
DE2821888C2 (de) * 1978-05-19 1980-10-09 Kocks Technik Gmbh & Co, 4000 Duesseldorf Vorrichtung zum Kalibrieren von Metallblöcken

Also Published As

Publication number Publication date
DE69211492T2 (de) 1997-01-23
FR2683468B1 (fr) 1995-06-09
DK0541471T3 (da) 1996-10-28
FR2683468A1 (fr) 1993-05-14
ES2089466T3 (es) 1996-10-01
DE69211492D1 (de) 1996-07-18
GR3020448T3 (en) 1996-10-31
ATE139152T1 (de) 1996-06-15
EP0541471A1 (fr) 1993-05-12

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