EP0541471B1 - Method of making steel slabs with square section and slabs so obtained - Google Patents

Method of making steel slabs with square section and slabs so obtained 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)
French (fr)
Other versions
EP0541471A1 (en
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
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Publication date
Application filed by UNIMETALL SA, Unimetal SA filed Critical UNIMETALL SA
Publication of EP0541471A1 publication Critical patent/EP0541471A1/en
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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.

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

Abstract

According to the method, these slabs are rolled on a blooming (cogging) mill according to edge rounds (2) having a radius (r) between substantially a quarter and a third of the length (c) of a side of the slab. The product (1) obtained is a compromise between a round in the form of a bar and a customary square slab. This slab with rounded edges dispenses with certain preforging operations on the premises of blacksmiths who use slabs and makes it possible, without expense, to extend the production range of square sections towards round products. <IMAGE>

Description

La présente invention concerne un procédé de forgeage de pièce de revolution à partir de billettes en acier.The present invention relates to a process for forging a piece of revolution from steel billets.

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.
It is known that the steel semi-finished products intended for forging are generally round, or quadrangular and in this case generally of square section. Some of these semi-finished products can later be worked in the forge to make finished products ready for use. Blacksmiths therefore actually have to choose between two types of semi-finished products:
  • or round bars, which have the advantage of being ready for use in the forge for the manufacture of revolution parts, but on the other hand are relatively expensive to purchase:
  • or square billets, more economical to buy, but which must be pre-punched to get as close as possible to a circle.

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.In addition, the rolling of round bars directly on the production sites of square billets raises difficulties, because of the additional investments necessary for this manufacturing and handling of the bars, investments considered besides as heavy for a production altogether marginal in a wide existing range of quadrangular products.

L'invention a pour but de résoudre ce dilemme.The invention aims to solve this dilemma.

A cet effet, l'invention a pour objet un procédé selon la revendication 1.To this end, the invention relates to a method according to claim 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.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.

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.In addition, they can in some cases completely replace round bars, and their cost price is much lower than that of the latter.

L'invention permet ainsi d'élargir quasiment sans frais vers les produits ronds la gamme de production habituelle des formats quadrangulaires.The invention thus makes it possible to extend, almost without cost, to round products the usual production range of quadrangular formats.

Les billettes à laminer selon l'invention peuvent bien entendu être obtenues par coulée continue à l'état de blooms.The billets to be laminated according to the invention can of course be obtained by continuous casting in the state of blooms.

L'invention sera maintenant décrite en référence au dessin annexé qui illustre une forme de réalisation d'une billette selon l'invention.The invention will now be described with reference to the accompanying drawing which illustrates an embodiment of a billet according to the invention.

La figure unique est une vue en section, à échelle réduite, d'une billette selon l'invention.The single figure is a sectional view, on a reduced scale, of a billet according to the 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.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.

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.To this end, in the rolling stands, the usual cylinders with a small radius groove bottom are replaced by cylinders with rounded bottom grooves, adapted to the curvature which it is desired to obtain for the edges.

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.The aforementioned limits are justified as follows: if the radius r is less than 0.25c, the billet obtained is too close to the square billets. The blacksmiths should therefore forge it themselves to bring it closer to a round billet. Such a billet would in fact be of no interest to blacksmiths.

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).It should be remembered in this regard that a usual square billet actually has slightly rounded edges. Thus a 100mm side billet has a corner radius of substantially 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.If, on the other hand, the radius r is greater than 0.33c, this will raise a difficulty for the billet producer, since these rounded products will have too much tendency to roll rather than slip on the installations located downstream from the rolling train. However, on square billet production lines, these must be able to slide, because of their flat faces. The design of the handling tools should therefore be reconsidered, which would entail costly additional investments for billet producers, which would increase the cost of producing rounded billets.

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.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.

Claims (3)

  1. Method of forging axisymmetric components from billets made of steel, characterized in that billets of scare of substantially square format are rolled on a billet-rolling mill train, into a rounded edge (2) having a radius (r) lying between substantially one quarter and one third of the length (c) of one side of the said billet, and then the billets thus obtained are forged.
  2. Steel billet intended to be forged, characterized in that it has a substantially square format, the four edges being rounded into a rounded edge (2) having a radius (r) lying between one quarter and one third of the length (c) of one side, and in that it is obtained by a rolling operation according to Claim 1.
  3. Steel billet according to Claim 2, characterized in that it is obtained from a bloom produced by continuous casting.
EP92470029A 1991-11-08 1992-10-23 Method of making steel slabs with square section and slabs so obtained Expired - Lifetime EP0541471B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9113833 1991-11-08
FR9113833A FR2683468B1 (en) 1991-11-08 1991-11-08 PROCESS FOR THE MANUFACTURE OF QUADRANGULAR FORMAT STEEL BILLETS AND BILLETS THUS OBTAINED.

Publications (2)

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

Family

ID=9418779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92470029A Expired - Lifetime EP0541471B1 (en) 1991-11-08 1992-10-23 Method of making steel slabs with square section and slabs so obtained

Country Status (7)

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

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 (en) * 1966-06-08 1967-07-21 Improvements in rolled products
DE1909699A1 (en) * 1969-02-26 1970-09-17 Vyzk Ustav Hutnictvi Zeleza High quality steel
DE2821888C2 (en) * 1978-05-19 1980-10-09 Kocks Technik Gmbh & Co, 4000 Duesseldorf Device for calibrating metal blocks

Also Published As

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

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