EP0181828A1 - Device for rotationally driving the work rolls of a planetary mill for long rolling stock - Google Patents

Device for rotationally driving the work rolls of a planetary mill for long rolling stock Download PDF

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Publication number
EP0181828A1
EP0181828A1 EP85440064A EP85440064A EP0181828A1 EP 0181828 A1 EP0181828 A1 EP 0181828A1 EP 85440064 A EP85440064 A EP 85440064A EP 85440064 A EP85440064 A EP 85440064A EP 0181828 A1 EP0181828 A1 EP 0181828A1
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Prior art keywords
axis
roller
ramp
rotor
rolling
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EP85440064A
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German (de)
French (fr)
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EP0181828B1 (en
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Bernard Fazan
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Institut de Recherches de la Siderurgie Francaise IRSID
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Institut de Recherches de la Siderurgie Francaise IRSID
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Priority to AT85440064T priority Critical patent/ATE44893T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/18—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for step-by-step or planetary rolling; pendulum mills

Definitions

  • the present invention relates to planetary rolling mill installations for rolling long metal products, in particular steel. It relates more specifically to the rotation drive of the working rollers which equip the rotors of these installations.
  • a planetary rolling mill always consists, in principle, in the fact that the working rolls (or rollers) can not only rotate about their axis, but also move in space along a cylindrical trajectory which n is not necessarily revolutionary and which is not necessarily closed.
  • the planetary rolling plants considered here are those in which the rollers are mounted in free rotation on their axes, which are parallel to each other and distributed at the periphery of rotors whose axis of rotation is itself parallel to those of the rollers.
  • the rotors are grouped in pairs on either side of the product to be rolled.
  • a so-called "universal" planetary rolling mill is a processing tool specific to long products and which has at least two pairs of rotors, angularly offset around the product to be laminated in order to be able to laminate each of its faces.
  • rollers come periodically, over a portion of their orbit, called the working arc, into contact with the product to be laminated. They then suddenly acquire a high speed of rotation on themselves determined by the speed of the rotor which carries them and by the conditions of contact with the material to be laminated. We know that these sudden accelerations in the rotation of each roller during the first moments of contact with the product to be rolled can lead to slippage, and therefore to early wear of the rollers, as well as to subsequent defects on the surface of the rollers. products.
  • the subject of the invention is a device for driving in rotation the working rollers of an installation of planetary rolling mill constituted by a ramp associated with each rotor, arranged outside thereof and on which each roller rolls before coming to laminate the product and of which any point of the rolling track is located at a distance from the axis of the rotor included between the distances from this axis of the points of the generator of contact of each roller with the product to be laminated, respectively the closest point and the point furthest from the axis of the roller, and by a bearing provided at one end at less than each roller and the lateral surface of which constitutes a strip by means of which the roller comes into contact with the rolling track of said ramp.
  • pebbles have the general shape of a "diabolo".
  • the two conical parts are connected to their small base by a rounding forming the bottom of a groove which laminates the edges of the product and the sides laminate the sides of the product on either side of this edge (see for example the request EPA-0000290 or French patent application No. 84/02803).
  • the ramp it is advantageous to dispose the ramp so that its running track is at a distance from the axis of the rotor close or equal 'to that of the half-depth of the groove.
  • the running track of the ramp and / or the journals are provided with a friction lining to alleviate the tendency of the roller to slip on the ramp.
  • the invention therefore consists, in its essential characteristics, of equipping a planetary rolling installation with long products with means intended to give the rollers a determined movement of rotation on themselves before they are brought into contact of the product to be laminated, the direction of this preliminary rotation being the same as that of the rotation on itself which the roller naturally acquires when it traverses its working arc.
  • the prior rotation speed of the rollers is not arbitrary, but adapted to that normally acquired in the rolling phase in contact with the product, so that an acceleration is also avoided.
  • the rollers in the first moments of their coming into contact with the product are not limited to give the rollers a determined movement of rotation on themselves before they are brought into contact of the product to be laminated, the direction of this preliminary rotation being the same as that of the rotation on itself which the roller naturally acquires when it traverses its working arc.
  • the prior rotation speed of the rollers is not arbitrary, but adapted to that normally acquired in the rolling phase in contact with the product, so that an acceleration is also avoided.
  • the result sought by the invention is the elimination, or at least a strong attenuation, of the discontinuity of the rotational movement of a roller on itself which usually exists between the moment of its engagement on its working arc and the previous moments when it is free to rotate on its axis.
  • FIGS. 1a and 1b illustrate the concept of "rolling radius” which will make it possible to understand the foundations of the invention.
  • the "rolling radius” R is the internal radius of a fictitious ring 1, having as its axis the axis 2 of the rotor (not shown), and on which a fictitious cylindrical roller 3, having the same axis as the axis 4 of the real roller 5 (shown on its working axis rolling a steel billet 6), would roll by taking a rotation speed on itself ⁇ f , identical to the true rotation speed ⁇ that the real roller 5 takes around its axis 4.
  • cylindrical bearings 11 are provided at the ends of the roller 5 having a circular strip 9, of the same axis 4 as the roller and of radius e which can be determined by the preceding relationship.
  • the radius e of the strip 9 is necessarily comprised between the extreme radii of the grip of the roller, that is to say between the radius G of the groove bottom 13 laminating the edge of the product 6 and the radius F end points 14 of blanks 15 of the groove laminating the sides of the product on either side of this edge.
  • the strip 9 is the outside face of a friction lining 12 constituted by a ring which is fitted to the end bearing surfaces 11.
  • This lining is made of a material, such as those used in friction clutches, that is to say having good friction properties ensuring a satisfactory drive.
  • a similar lining can of course also be provided to constitute the race track 8 of the ramp 7 and this separately or jointly with the ring 12 of the end bearings 11. Another advantage of the presence of such linings is to constitute bands easily replaceable.
  • the ramp 7 for prior speed setting of the rollers is interrupted in the vicinity of the rolled bar 6 so that the roller is free to take the speed of rotation n corresponding to the conditions of contact with the rolled metal without risk of skating.
  • the ramp can extend as far as desired around the rotor.
  • a ramp length of the order of 1 m is sufficient for obtaining the desired result and this with the usual range. rotational speeds imposed on the rotor. Of course, this length of 1 m can be further reduced if friction linings are used.
  • end bearings 11 of conical shape.
  • This in combination with a ramp, such as 7, no longer fixed in space, but adjustable in translation parallel to the axis 2 of the rotor and radially with respect to this axis, makes it possible to modify the rolling radius R and by Therefore set the rotation speed ⁇ of the roller 5 on the ramp 7 to the desired value.
  • the means for fixing the ramp 7 must keep it in the same plane perpendicular to the axis 2 of the rotor while allowing it a slight tilting movement in this plane to take account of the fact that the envelope of the cross section of the conical bearing surface of the roller, contained in the plane of the ramp, is a circle whose radius varies with the lateral position of the ramp and therefore cannot remain constantly equal to the inside radius of the ramp runway.
  • the ramp fastening means may consist of springs or hydraulic or pneumatic cylinders, distributed over the outer periphery of the ramp and exerting convergent thrust forces directed towards the axis of the rotor.
  • Such fastening means allow both a tilting movement and a slight movement of radial translation relative to the axis of the rotor.
  • separate additional means will be provided to ensure a radial adjustment of greater amplitude than that permitted by said fixing means.
  • This variant of the invention which makes it possible to vary the radius E l , is particularly advantageous insofar as it is not possible in advance, without measuring ⁇ with precision, to know exactly the value of f which will give the speed of rotation corresponding to the optimal rolling conditions.
  • this value is between the minimum radius G of the roller at the bottom of the groove and the maximum radius F of the part of the groove in contact with the rolled product
  • we choose a priori a lateral position of the ramp such that the contact between the ramp and the conical bearing takes place at the level of half the depth of the groove and the lateral position of the ramp is then adjusted so as to achieve the optimal rolling conditions between the roller and the rolled product which result in an absence of slippage, a good surface condition of the rolled product and minimal wear of the rollers.
  • the invention will generally be implemented so as to equalize the speed of rotation ⁇ of the roller on the ramp 7 to its rolling speed without sliding on the working arc TT ', the fact remains conceivable, according to the wishes or necessities of the user, to provide a slight relative difference of ⁇ ,% (for example 5 or 10%) between these two speeds.
  • the option ⁇ % different from zero means that the user accepts, during the first moments of contact with the product to be rolled, a certain rate of sliding of the roller bearing on the product.

Abstract

1. Device for rotationally driving the work rolls of a planetary mill for long rolling stock in which the rolls comprise a groove rolling the angles of the rolling stock and are mounted so as to rotate freely about their respective axes, which are parallel to each other and distributed on the periphery of rotors whose axis of rotation is itself parallel to those of the rolls, and consists of a ramp associated with each rotor and which is disposed on the outside of the latter and on which each roll runs before rolling the rolling stock, characterized in that : - any point on the rolling track (8) of the ramp (7) is located at a distance (Rr ) from the axis (2) of the rotor of between the distances to the said axis (2) from the bottom (13) of the groove of the roll (5) and from the point of contact (14) between the roll and the rolling stock to be rolled (6) which is furthest away from the axis (4) of the roll ; - and in that each roll comprises a bearing surface (11) provided at at least one end of the said roll and whose lateral surface constitutes a strip (9) by means of which the roll comes into contact with the rolling track (8) of the ramp (7).

Description

La présente invention concerne les installations de laminoir planétaire pour le laminage de produits métalliques longs, notamment en acier. Elle a trait plus spécialement à l'entraînement en rotation des galets de travail qui équipent les rotors de ces installations.The present invention relates to planetary rolling mill installations for rolling long metal products, in particular steel. It relates more specifically to the rotation drive of the working rollers which equip the rotors of these installations.

On rappelle qu'un laminoir planétaire consiste toujours, dans son principe, dans le fait que les cylindres (ou galets) de travail peuvent, non seulement tourner autour de leur axe, mais également se déplacer dans l'espace selon une trajectoire cylindrique qui n'est pas nécessairement de révolution et qui n'est pas nécessairement fermée.It is recalled that a planetary rolling mill always consists, in principle, in the fact that the working rolls (or rollers) can not only rotate about their axis, but also move in space along a cylindrical trajectory which n is not necessarily revolutionary and which is not necessarily closed.

Les installations de laminage planétaire considérées ici sont celles dans lesquelles les galets sont montés en rotation libre sur leurs axes, lesquels sont parallèles entre eux et répartis à la périphérie de rotors dont l'axe de rotation est lui-même parallèle à ceux des galets. Les rotors sont groupés par paire de part et d'autre du produit à laminer.The planetary rolling plants considered here are those in which the rollers are mounted in free rotation on their axes, which are parallel to each other and distributed at the periphery of rotors whose axis of rotation is itself parallel to those of the rollers. The rotors are grouped in pairs on either side of the product to be rolled.

Un laminoir planétaire dit "universel" est un outil de transformation spécifique aux produits longs et qui présente au moins deux paires de rotors, décalées angulairement autour du produit à laminer afin de pouvoir en laminer chacune de ses faces.A so-called "universal" planetary rolling mill is a processing tool specific to long products and which has at least two pairs of rotors, angularly offset around the product to be laminated in order to be able to laminate each of its faces.

Les galets viennent périodiquement, sur une portion de leur orbite, appelée arc de travail, au contact du produit à laminer. Ils acquièrent alors brusquement une vitesse élevée de rotation sur eux-mêmes déterminée par la vitesse du rotor qui les porte et par les conditions de contact avec le matériau à laminer. On sait que ces brusques accélérations de la rotation de chaque galet au cours des premiers instants du contact avec le produit à laminer peuvent conduire à un patinage, et donc à une usure précoce des galets, ainsi qu'à des défauts ultérieurs sur la surface des produits.The rollers come periodically, over a portion of their orbit, called the working arc, into contact with the product to be laminated. They then suddenly acquire a high speed of rotation on themselves determined by the speed of the rotor which carries them and by the conditions of contact with the material to be laminated. We know that these sudden accelerations in the rotation of each roller during the first moments of contact with the product to be rolled can lead to slippage, and therefore to early wear of the rollers, as well as to subsequent defects on the surface of the rollers. products.

La présente invention a pour but de résoudre ce problème. A cet effet, l'invention a pour objet un dispositif d'entraînement en rotation des galets de travail d'une installation de laminoir planétaire constitué par une rampe associée à chaque rotor, disposée extérieurement à celui-ci et sur laquelle roule chaque galet avant de venir laminer le produit et dont tout point de la piste de roulement est situé à une distance de l'axe du rotor comprise entre les distances à cet axe des points de la génératrice de contact de chaque galet avec le produit à laminer, respectivement le point le plus proche et le point le plus éloigné de l'axe du galet, et par une portée ménagée à une extrémité au moins de chaque galet et dont la surface latérale constitue une bande par l'intermédiaire de laquelle le galet vient au contact de la piste de roulement de ladite rampe.The present invention aims to solve this problem. To this end, the subject of the invention is a device for driving in rotation the working rollers of an installation of planetary rolling mill constituted by a ramp associated with each rotor, arranged outside thereof and on which each roller rolls before coming to laminate the product and of which any point of the rolling track is located at a distance from the axis of the rotor included between the distances from this axis of the points of the generator of contact of each roller with the product to be laminated, respectively the closest point and the point furthest from the axis of the roller, and by a bearing provided at one end at less than each roller and the lateral surface of which constitutes a strip by means of which the roller comes into contact with the rolling track of said ramp.

On rappelle que les galets ont la forme générale d'un "diabolo". Les deux parties coniques sont raccordées à leur petite base par un arrondi formant le fond d'une gorge qui lamine les arêtes du produit et les flancs laminent les côtés du produit de part et d'autre de cette arête (voir par ex. la demande de brevet EPA-0000290 ou la demande de brevet français n° 84/02803).Remember that the pebbles have the general shape of a "diabolo". The two conical parts are connected to their small base by a rounding forming the bottom of a groove which laminates the edges of the product and the sides laminate the sides of the product on either side of this edge (see for example the request EPA-0000290 or French patent application No. 84/02803).

Conformément à l'invention, on aura avantage à disposer la rampe de manière que sa piste de roulement soit à une distance de l'axe du rotor proche, voire égale,' à celle de la demi-profondeur de la gorge.According to the invention, it is advantageous to dispose the ramp so that its running track is at a distance from the axis of the rotor close or equal 'to that of the half-depth of the groove.

Avantageusement, la piste de roulement de la rampe et/ou les tourillons sont pourvus d'une garniture à friction pour pallier la tendance du galet à patiner sur la rampe.Advantageously, the running track of the ramp and / or the journals are provided with a friction lining to alleviate the tendency of the roller to slip on the ramp.

Comme on le comprend, l'invention consiste donc, dans ses caractéristiques essentielles, à équiper une installation de laminage planétaire de produits longs de moyens destinés à conférer aux galets un mouvement déterminé de rotation sur eux-mêmes avant qu'ils soient mis au contact du produit à laminer, le sens de cette rotation préalable étant le même que celui de la rotation sur lui-même qu'acquière naturellement le galet lorsqu'il parcourt son arc de travail. En outre, la vitesse de rotation préalable des galets n'est pas quelconque, mais adaptée à celle acquise normalement en phase de laminage au contact du produit, de sorte que l'on évite aussi une accélération brutale de la rotation des galets dans les premiers moments de leur venue au contact du produit. En somme, le résultat recherché par l'invention est la suppression, ou du moins une forte atténuation, de la discontinuité du mouvement de rotation d'un galet sur lui-même qui existe habituellement entre le moment de son engagement sur son arc de travail et les instants précédents où il est libre de rotation sur son axe.As can be understood, the invention therefore consists, in its essential characteristics, of equipping a planetary rolling installation with long products with means intended to give the rollers a determined movement of rotation on themselves before they are brought into contact of the product to be laminated, the direction of this preliminary rotation being the same as that of the rotation on itself which the roller naturally acquires when it traverses its working arc. In addition, the prior rotation speed of the rollers is not arbitrary, but adapted to that normally acquired in the rolling phase in contact with the product, so that an acceleration is also avoided. brutal rotation of the rollers in the first moments of their coming into contact with the product. In short, the result sought by the invention is the elimination, or at least a strong attenuation, of the discontinuity of the rotational movement of a roller on itself which usually exists between the moment of its engagement on its working arc and the previous moments when it is free to rotate on its axis.

L'invention sera de toute façon bien comprise, et d'autres aspects et avantages ressortiront plus clairement de la description qui suit, donnée en référence aux planches de dessins annexées, sur lesquelles :

  • - les fig. 1a et 1b sont des schémas à finalité pédagogique permettant de bien comprendre le principe de l'invention, le schéma 1a étant une représentation réelle d'un galet à gorge pour produit long, le schéma 1b étant, en correspondance de cote, une représentation fictive du galet de la fig. 1a ;
  • - la fig. 2 est une vue en section longitudinale médiane d'un galet de travail au contact par ses portées d'extrémité avec la piste de roulement ;
  • - la fig. 3 est une vue schématique en coupe transversale médiane du galet et la rampe de roulement selon le plan AA de la figure 2.
The invention will in any case be well understood, and other aspects and advantages will emerge more clearly from the description which follows, given with reference to the plates of attached drawings, in which:
  • - figs. 1a and 1b are diagrams for educational purposes allowing a good understanding of the principle of the invention, diagram 1a being a real representation of a grooved roller for long product, diagram 1b being, in correspondence of dimension, a fictitious representation of the roller of fig. 1a;
  • - fig. 2 is a view in median longitudinal section of a working roller in contact by its end bearings with the raceway;
  • - fig. 3 is a schematic view in median cross-section of the roller and the rolling ramp according to the plane AA of FIG. 2.

Les figures 1a et 1b illustrent la notion de "rayon de roulement" qui va permettre de comprendre les fondements de l'invention. Le "rayon de roulement" R est le rayon intérieur d'une bague fictive 1, ayant pour axe, l'axe 2 du rotor (non représenté), et sur laquelle un galet fictif cylindrique 3, ayant même axe que l'axe 4 du galet réel 5 (représenté sur son axe de travail laminant une billette d'acier 6), roulerait en prenant une vitesse de rotation sur lui-même Ωf, identique à la vitesse de rotation vraie Ω que prend le galet réel 5 autour de son axe 4. Il s'agit ici de la vitesse n du mouvement de rotation stabilisé, donc sans glissement, que prend le galet 5 le long de son arc de travail au terme de sa phase d'accélération brutale qui a lieu au cours des premiers instants de sa venue au contact du produit 6. Cette vitesse Ω est une grandeur mesurable par des moyens usuels. De même, la vitesse de rotation (J du rotor autour de son axe 2 est imposée et constante. On aura noté que son sens est bien entendu opposé à celui de la rotation du galet 5.FIGS. 1a and 1b illustrate the concept of "rolling radius" which will make it possible to understand the foundations of the invention. The "rolling radius" R is the internal radius of a fictitious ring 1, having as its axis the axis 2 of the rotor (not shown), and on which a fictitious cylindrical roller 3, having the same axis as the axis 4 of the real roller 5 (shown on its working axis rolling a steel billet 6), would roll by taking a rotation speed on itself Ω f , identical to the true rotation speed Ω that the real roller 5 takes around its axis 4. This is the speed n of the stabilized rotational movement, therefore without sliding, taken by the roller 5 along its working arc at the end of its brutal acceleration phase which takes place during the first moments of its coming into contact with the product 6. This speed Ω is a quantity measurable by usual means. Similarly, the speed of rotation (J of the rotor around its axis 2 is imposed and constant. It will be noted that its direction is of course opposite to that of the rotation of the roller 5.

On voit dès lors que si l'on désigne par "R" le rayon de l'orbite engendrée par l'axe 4 du galet réel 5, le galet fictif 3 a un rayon e = R - R et il existe entre le rayon connu R et le rayon inconnu f , la relation suivante qui exprime la condition du roulement sans glissement recherchée

Figure imgb0001
We therefore see that if we designate by "R" the radius of the orbit generated by the axis 4 of the real roller 5, the fictitious roller 3 has a radius e = R - R and there is between the known radius R and the unknown radius f, the following relation which expresses the condition of the rolling without sliding sought
Figure imgb0001

Cette relation permet de déterminer e, connaissant Ωf que l'on prend égale à Ω, selon :

Figure imgb0002
This relation makes it possible to determine e, knowing Ω f which one takes equal to Ω, according to:
Figure imgb0002

La présente invention consiste donc, comme on le voit sur les figures 2 et 3, à doter chaque rotor (symbolisé par son axe 2) d'une rampe extérieure 7, solidaire du bâti de l'installation, présentant une piste de roulement 8 de profil longitudinal de forme circulaire centré sur l'axe 2 et de rayon R r = R + e , où e peut être déterminé à l'aide de la relation précédente. En outre, aux extrémités du galet 5 sont prévus des portées cylindriques 11 présentant une bande circulaire 9, de même axe 4 que le galet et de rayon e qui peut être déterminé par la relation précédente. Ainsi, avant d'aller au contact du produit à laminer 6, le galet vient rouler sur la piste 8 de la rampe 7 (par l'intermédiaire de la bande 9 de ses portées d'extrémité) où il acquiert déjà la vitesse de rotation sur lui-même que lui imposerait normalement par la suite le contact avec le produit à laminer lorsqu'il parcourera son axe de travail TT' (fig. 3).The present invention therefore consists, as seen in Figures 2 and 3, in providing each rotor (symbolized by its axis 2) with an external ramp 7, integral with the frame of the installation, having a rolling track 8 of longitudinal profile of circular shape centered on axis 2 and of radius R r = R + e, where e can be determined using the preceding relation. In addition, cylindrical bearings 11 are provided at the ends of the roller 5 having a circular strip 9, of the same axis 4 as the roller and of radius e which can be determined by the preceding relationship. Thus, before going into contact with the product to be laminated 6, the roller comes to roll on the track 8 of the ramp 7 (via the band 9 of its end bearings) where it already acquires the speed of rotation. on itself that would normally impose on it contact with the product to be laminated when it travels along its working axis TT '(fig. 3).

On observera que le rayon e de la bande 9 est nécessairement compris entre les rayons extrêmes de l'emprise du galet, c'est-à-dire entre le rayon G du fond de gorge 13 laminant l'arête du produit 6 et le rayon F des points d'extrémités 14 des flans 15 de la gorge laminant les côtés du produit de part et d'autre de cette arête.It will be observed that the radius e of the strip 9 is necessarily comprised between the extreme radii of the grip of the roller, that is to say between the radius G of the groove bottom 13 laminating the edge of the product 6 and the radius F end points 14 of blanks 15 of the groove laminating the sides of the product on either side of this edge.

Bien qu'en toute rigueur, une seule portée d'extrémité 11 par galet (donc également une seule rampe d'entraînement par rotor) suffise à la mise en oeuvre de l'invention, on comprend aisément que, pour des raisons de "porte-à-faux", de répartition des efforts et d'équilibrage des forces, il est préférable d'en prévoir deux.Although strictly speaking, a single end bearing 11 per roller (therefore also a single drive ramp per rotor) is sufficient for the implementation of the invention, it is easily understood that, for reasons of "door -to-false ", distribution of forces and balancing of forces, it is preferable to provide two.

Conformément à une autre variante avantageuse, la bande 9 est la face extérieure d'une garniture à friction 12 constituée par une bague que l'on emmanche sur les portées d'extrémité 11.According to another advantageous variant, the strip 9 is the outside face of a friction lining 12 constituted by a ring which is fitted to the end bearing surfaces 11.

Cette garniture est constituée d'un matériau, tel que ceux utilisés dans les embrayages à friction, c'est-à-dire présentant de bonnes propriétés de frottement assurant un entraînement satisfaisant. Une garniture analogue peut bien entendu être également prévue pour constituer la piste de roulement 8 de la rampe 7 et ceci séparément ou conjointement avec la bague 12 des portées d'extrémité 11. Un autre avantage de la présence de telles garnitures est de constituer des bandes d'usure facilement remplaçables.This lining is made of a material, such as those used in friction clutches, that is to say having good friction properties ensuring a satisfactory drive. A similar lining can of course also be provided to constitute the race track 8 of the ramp 7 and this separately or jointly with the ring 12 of the end bearings 11. Another advantage of the presence of such linings is to constitute bands easily replaceable.

On aura observé sur la figure 3, que la rampe 7 de mise en vitesse préalable des galets est interrompue au voisinage de la barre laminée 6 afin que le galet soit libre de prendre la vitesse de rotation n correspondant aux conditions de contact avec le métal laminé sans risque de patinage. A son autre extrémité, la rampe peut se prolonger aussi loin que l'on souhaite autour du rotor. Cependant, l'expérience montre que, dans le cas de galets à portées cylindriques 11 ayant 15 cm de rayon, une longueur de rampe de l'ordre d'1 m est suffisante pour l'obtention du résultat recherché et ceci avec la gamme habituelle des vitesses de rotation imposées au rotor. Bien entendu, cette longueur de 1 m, peut être encore réduite si l'on utilise des garnitures à friction.It will have been observed in FIG. 3 that the ramp 7 for prior speed setting of the rollers is interrupted in the vicinity of the rolled bar 6 so that the roller is free to take the speed of rotation n corresponding to the conditions of contact with the rolled metal without risk of skating. At its other end, the ramp can extend as far as desired around the rotor. However, experience shows that, in the case of rollers with cylindrical surfaces 11 having a radius of 15 cm, a ramp length of the order of 1 m is sufficient for obtaining the desired result and this with the usual range. rotational speeds imposed on the rotor. Of course, this length of 1 m can be further reduced if friction linings are used.

Il est clair que l'invention ne saurait se limiter à l'exemple décrit ci-avant mais s'étend à d'autres variantes ou équivalents dans la mesure où sont respectées les caractéristiques essentielles données dans les revendications ci-jointes.It is clear that the invention cannot be limited to the example described above but extends to other variants or equivalents insofar as the essential characteristics given in the appended claims are respected.

En particulier, il est très commode de prévoir des portées d'extrémité 11 de forme conique. Cela, en association avec une rampe, telle que 7, non plus fixe dans l'espace, mais réglable en translation parallèle à l'axe 2 du rotor et radialement par rapport à cet axe, permet de modifier le rayon de roulement R et par conséquent de régler la vitesse de rotation Ω du galet 5 sur la rampe 7 à la valeur souhaitée.In particular, it is very convenient to provide end bearings 11 of conical shape. This, in combination with a ramp, such as 7, no longer fixed in space, but adjustable in translation parallel to the axis 2 of the rotor and radially with respect to this axis, makes it possible to modify the rolling radius R and by Therefore set the rotation speed Ω of the roller 5 on the ramp 7 to the desired value.

Bien entendu, dans cette variante de l'invention, les moyens de fixation de la rampe 7 doivent la maintenir dans un même plan perpendiculaire à l'axe 2 du rotor tout en lui permettant un léger mouvement de basculement dans ce plan pour tenir compte du fait que l'enveloppe de la section droite de la portée conique du galet, contenue dans le plan de la rampe, est un cercle dont le rayon varie avec la position latérale de la rampe et ne peut donc rester constamment égal au rayon intérieur de la piste de roulement de la rampe.Of course, in this variant of the invention, the means for fixing the ramp 7 must keep it in the same plane perpendicular to the axis 2 of the rotor while allowing it a slight tilting movement in this plane to take account of the fact that the envelope of the cross section of the conical bearing surface of the roller, contained in the plane of the ramp, is a circle whose radius varies with the lateral position of the ramp and therefore cannot remain constantly equal to the inside radius of the ramp runway.

Les moyens de fixation de la rampe peuvent être constitués de ressorts ou vérins hydrauliques ou pneumatiques, répartis sur le pourtour extérieur de la rampe et exerçant des efforts de poussée convergents dirigés vers l'axe du rotor. De tels moyens de fixation permettent à la fois un mouvement de basculement et un léger mouvement de translation radiale par rapport à l'axe du rotor. Bien entendu, si nécessaire, on prévoira des moyens supplémentaires distincts pour assurer un réglage radial de plus grande amplitude que celle permise par lesdits moyens de fixation.The ramp fastening means may consist of springs or hydraulic or pneumatic cylinders, distributed over the outer periphery of the ramp and exerting convergent thrust forces directed towards the axis of the rotor. Such fastening means allow both a tilting movement and a slight movement of radial translation relative to the axis of the rotor. Of course, if necessary, separate additional means will be provided to ensure a radial adjustment of greater amplitude than that permitted by said fixing means.

Cette variante de l'invention,qui permet de faire varier le rayon El, est particulièrement intéressante dans la mesure où il n 'est pas possible à l'avance, sans mesurer Ω avec précision, de connaître exactement la valeur de f qui donnera au galet la vitesse de rotation correspondant aux conditions optimales de laminage.This variant of the invention, which makes it possible to vary the radius E l , is particularly advantageous insofar as it is not possible in advance, without measuring Ω with precision, to know exactly the value of f which will give the speed of rotation corresponding to the optimal rolling conditions.

Comme on sait néanmoins que cette valeur est comprise entre le rayon minimum G du galet en fond de gorge et le rayon maximum F de la partie de la gorge en contact avec le produit laminé, on choisit a priori une position latérale de la rampe telle que le contact entre la rampe et la portée conique se fasse au niveau de la moitié de la profondeur de la gorge et on ajuste ensuite la position latérale de la rampe de manière à réaliser les conditions de laminage optimales entre le galet et le produit laminé qui se traduisent par une absence de patinage, un bon état de surface du produit laminé et une usure minimale des galets.As we know, however, that this value is between the minimum radius G of the roller at the bottom of the groove and the maximum radius F of the part of the groove in contact with the rolled product, we choose a priori a lateral position of the ramp such that the contact between the ramp and the conical bearing takes place at the level of half the depth of the groove and the lateral position of the ramp is then adjusted so as to achieve the optimal rolling conditions between the roller and the rolled product which result in an absence of slippage, a good surface condition of the rolled product and minimal wear of the rollers.

De même, si l'invention sera généralement mise en oeuvre de façon à égaliser la vitesse de rotation Ω du galet sur la rampe 7 à sa vitesse de roulement sans glissement sur l'arc de travail TT', il n'en reste pas moins envisageable, selon les souhaits ou nécessités de l'utilisateur, de prévoir un léger écart relatif de Δ, % (par exemple 5 ou 10 %) entre ces deux vitesses.Similarly, if the invention will generally be implemented so as to equalize the speed of rotation Ω of the roller on the ramp 7 to its rolling speed without sliding on the working arc TT ', the fact remains conceivable, according to the wishes or necessities of the user, to provide a slight relative difference of Δ,% (for example 5 or 10%) between these two speeds.

Compte tenu de ceci, la relation de détermination de donnée auparavant s'exprime par la formulation générale suivante

Figure imgb0003
Deut être ou non égal à zéro.In view of this, the previously determined data relation is expressed by the following general formulation
Figure imgb0003
 It should have been zero or not.

L'option Δ % différent de zéro, signifie bien entendu que l'utilisateur accepte, au cours des premiers instants du contact avec le produit à laminer, un certain taux de glissement du roulement du galet sur le produit.The option Δ% different from zero, of course means that the user accepts, during the first moments of contact with the product to be rolled, a certain rate of sliding of the roller bearing on the product.

Claims (10)

1) Dispositif d'entraînement en rotation des galets de travail d'une installation de laminoir planétaire de produits longs dans laquelle les galets sont montés en rotation libre autour de leurs axes respectifs, lesquels sont parallèles entre eux et répartis à la périphérie de rotors dont l'axe de rotation est lui-même parallèle à ceux des galets, dispositif caractérisé en ce qu'il est constitué : - par une rampe (7) associée à chaque rotor, disposée extérieurement à celui-ci et sur laquelle roule chaque galet (5) avant de venir laminer le produit (6) et dont tout point de la piste de roulement (8) est situé à une distance (R ) de l'axe (2) du rotor comprise entre les distances audit axe (2) des points extrêmes de la génératrice de contact de chaque galet avec le produit à laminer, respectivement du point le plus proche (13) et du point le plus éloigné (14) de l'axe (4) du galet ; - et par une portée (11) ménagée à une extrémité au moins de chaque galet (5) et dont la surface latérale constitue une bande (9) par l'intermédiaire de laquelle le galet vient au contact de la piste de roulement (8) de la rampe (7). 1) Device for rotating the working rollers of a planetary rolling mill installation of long products in which the rollers are mounted in free rotation about their respective axes, which are parallel to one another and distributed around the periphery of rotors, the axis of rotation is itself parallel to those of the rollers, device characterized in that it consists of: - By a ramp (7) associated with each rotor, arranged outside thereof and on which each roller (5) rolls before coming to laminate the product (6) and of which any point of the rolling track (8) is located at a distance (R) from the axis (2) of the rotor between the distances from said axis (2) of the end points of the generator of contact of each roller with the product to be laminated, respectively from the nearest point (13) and from the most distant point (14) from the axis (4) of the roller; - And by a bearing surface (11) formed at at least one end of each roller (5) and the lateral surface of which constitutes a strip (9) by means of which the roller comes into contact with the rolling track (8) of the ramp (7). 2) Dispositif selon la revendication 1 caractérisé en ce que la piste de roulement (8) est située, en tout point, à une distance, de l'axe (2) du rotor, égale environ à celle de la demi-profondeur de la gorge du galet (5) définie par la génératrice de contact avec le produit à laminer (6).2) Device according to claim 1 characterized in that the raceway (8) is located, at any point, at a distance from the axis (2) of the rotor, approximately equal to that of the half-depth of the roller groove (5) defined by the contact generator with the product to be laminated (6). 3) Dispositif selon la revendication 1 caractérisé en ce que la distance (R ) de tout point de la piste de roulement r (8) à l'axe (2) du rotor est égale ou sensiblement égale à la valeur qui peut être obtenue par la résolution de l'expression R = R + e où R est le rayon de l'orbite parcourue par l'axe (4) du galet (5) et où e est une grandeur dont la valeur est donnée par la relation
Figure imgb0004
où ω représente la vitesse de rotation angulaire du rotor autour de son axe (2) et a représente la vitesse de rotation angulaire stabilisée du galet (5) autour de son axe (4) lorsque ledit galet est sur son arc de travail (TT').3) Device according to claim 1 characterized in that the distance (R) from any point of the rolling track r (8) to the axis (2) of the rotor is equal or substantially equal to the value which can be obtained by the resolution of the expression R = R + e where R is the radius of the orbit traversed by the axis (4) of the roller (5) and where e is a quantity whose value is given by the relation
Figure imgb0004
 where ω represents the angular speed of rotation of the rotor around its axis (2) and a represents the stabilized angular speed of rotation of the roller (5) around its axis (4) when said roller is on its working arc (TT ' ). 4) Dispositif selon la revendication 1 caractérisé en ce qu'une garniture à friction est prévue à l'endroit du contact entre la rampe (7) et le galet (5).4) Device according to claim 1 characterized in that a friction lining is provided at the point of contact between the ramp (7) and the roller (5). 5) Dispositif selon la revendication 4 caractérisé en ce que ladite garniture à friction est une bague (12) emmanchée autour de la portée d'extrémité (11) du galet.5) Device according to claim 4 characterized in that said friction lining is a ring (12) fitted around the end surface (11) of the roller. 6) Dispositif selon la revendication 1 caractérisé en ce que la piste de roulement (8) de la rampe (7) a un profil longitudinal de forme circulaire centré sur l'axe (2) du rotor, ledit axe étant fixé dans l'espace.6) Device according to claim 1 characterized in that the rolling track (8) of the ramp (7) has a longitudinal profile of circular shape centered on the axis (2) of the rotor, said axis being fixed in space . 7) Dispositif selon la revendication 1 caractérisé en ce que la portée' d'extrémité (11) est de forme cylindrique.7) Device according to claim 1 characterized in that the end 'reach (11) is of cylindrical shape. 8) Dispositif selon la revendication 1 caractérisé en ce que la portée d'extrémité des galets est de forme conique, en ce que la rampe (7) est réglable en translation parallèle à l'axe (2) du rotor et en ce que des moyens de fixation de la rampe sont prévus pour lui permettre un mouvement de basculement dans un plan perpendiculaire audit axe (2), lesdits moyens exerçant une action permanente dirigée vers l'axe (2) du rotor.8) Device according to claim 1 characterized in that the end bearing of the rollers is conical, in that the ramp (7) is adjustable in translation parallel to the axis (2) of the rotor and in that means for fixing the ramp are provided to allow it to tilt in a plane perpendicular to said axis (2), said means exerting a permanent action directed towards the axis (2) of the rotor. 9) Dispositif selon la revendication 8 caractérisé en ce que des moyens supplémentaires distincts sont prévus pour assurer un réglage de la rampe (7) radialement par rapport à l'axe (2) du rotor.9) Device according to claim 8 characterized in that separate additional means are provided to ensure an adjustment of the ramp (7) radially relative to the axis (2) of the rotor. 10) Dispositif selon la revendication 8 caractérisé en ce que lesdits moyens de fixation de la rampe (7) sont constitués par des ressorts ou des vérins pneumatiques ou hydrauliques répartis sur le pourtour extérieur de la rampe.10) Device according to claim 8 characterized in that said means for fixing the ramp (7) are constituted by springs or pneumatic or hydraulic cylinders distributed around the outer periphery of the ramp.
EP85440064A 1984-11-14 1985-11-07 Device for rotationally driving the work rolls of a planetary mill for long rolling stock Expired EP0181828B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85440064T ATE44893T1 (en) 1984-11-14 1985-11-07 ROTARY DRIVE DEVICE FOR WORK ROLLS OF A PLANETARY ROLLING MILL FOR LONG ROLLING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8417694 1984-11-14
FR8417694A FR2572962A1 (en) 1984-11-14 1984-11-14 DEVICE FOR DRIVING ROTATION OF WORKING ROLLS OF A PLANETARY ROLLING SYSTEM

Publications (2)

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EP0181828A1 true EP0181828A1 (en) 1986-05-21
EP0181828B1 EP0181828B1 (en) 1989-07-26

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EP85440064A Expired EP0181828B1 (en) 1984-11-14 1985-11-07 Device for rotationally driving the work rolls of a planetary mill for long rolling stock

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EP (1) EP0181828B1 (en)
JP (1) JPS61126912A (en)
AT (1) ATE44893T1 (en)
CA (1) CA1285793C (en)
CS (1) CS261230B2 (en)
DD (1) DD239133A5 (en)
DE (1) DE3571776D1 (en)
FR (1) FR2572962A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978933A (en) * 1958-03-05 1961-04-11 Sendzimir Tadeusz Beambacked planetary rolling mill

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978933A (en) * 1958-03-05 1961-04-11 Sendzimir Tadeusz Beambacked planetary rolling mill

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EP0181828B1 (en) 1989-07-26
CS817085A2 (en) 1988-05-16
DE3571776D1 (en) 1989-08-31
CA1285793C (en) 1991-07-09
DD239133A5 (en) 1986-09-17
CS261230B2 (en) 1989-01-12
ATE44893T1 (en) 1989-08-15
JPS61126912A (en) 1986-06-14
FR2572962A1 (en) 1986-05-16

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