EP2086722B1 - Tool for roller burnishing a toroidal fillet - Google Patents

Tool for roller burnishing a toroidal fillet Download PDF

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Publication number
EP2086722B1
EP2086722B1 EP07823820A EP07823820A EP2086722B1 EP 2086722 B1 EP2086722 B1 EP 2086722B1 EP 07823820 A EP07823820 A EP 07823820A EP 07823820 A EP07823820 A EP 07823820A EP 2086722 B1 EP2086722 B1 EP 2086722B1
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EP
European Patent Office
Prior art keywords
tool
roller
wheel
annular
axis
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Not-in-force
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EP07823820A
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German (de)
French (fr)
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EP2086722A1 (en
Inventor
Hatem Khanfir
Nicolas Massue
Gilles Yvenat
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Renault SAS
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Renault SAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B39/00—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor
    • B24B39/04—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor designed for working external surfaces of revolution
    • B24B39/045—Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone; Accessories therefor designed for working external surfaces of revolution the working tool being composed of a plurality of working rolls or balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
    • B21H7/18—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons grooved pins; Rolling grooves, e.g. oil grooves, in articles
    • B21H7/182—Rolling annular grooves
    • B21H7/185—Filet rolling, e.g. of crankshafts

Definitions

  • the invention relates to a burnishing tool for an O-ring.
  • the invention more particularly relates to an action tool for burnishing an O-ring connection between a cylindrical face delimiting the bottom of an annular groove in a rotating part and a first lateral annular surface flanking the groove, comprising in a housing a wheel resting on a roller whose rolling force on the groove has a radial component and a component along the axis of the wheel.
  • roller burnishing machines are known in the state of the art, in particular for applications of mechanical reinforcement by hardening of certain areas of a crankshaft of an internal combustion engine of a motor vehicle.
  • a crankshaft is a mechanical part in the form of a multi-section shaft which ensures the transformation of the reciprocating rectilinear motion of the piston-rod assembly of the engine, into a rotation.
  • Each crankshaft is dimensioned most accurately to optimize the performance and size of the associated engine, and its shape and dimensions depend on the number of cylinders, the number of bearings, the stroke, the disposition of the cylinders and the ignition order.
  • crankshaft is one of the most stressed parts of the engine.
  • the numerous stresses in torsion, bending, and vibration imply fatigue resistance problems, and therefore significant manufacturing constraints.
  • crankshaft comprises, in the usual manner, on the one hand hand crank arms extending generally radially and axially delimited by lateral faces generally orthogonal to the axis of rotation of the crankshaft and, secondly, cylindrical crankpin or trunnion sections, each of which extends axially from at least one lateral face of an arm crank and is delimited by a machined convex cylindrical surface which defines, with said side face an annular connection area.
  • Each annular zone of connection between a machined convex cylindrical surface of the crank pin or of a journal, and a crank arm side face comprises an O-ring so as to allow, among other things, machining of the convex cylindrical surface, without interference with the faces. side of the arms.
  • connection area and more particularly the area around the machining or connection toric discharge, is one of the areas of the crankshaft in which the mechanical stresses are highest.
  • hardening allows to modify the structure of a material by imposing a permanent deformation on the surface of the treated part to improve the mechanical properties such as yield strength, tensile stress, hardness, ductility and resilience.
  • the action tool of such a machine comprises at least one roller on each side of the housing, each roller applying an equal roller burnishing force on each of the two fillets of a groove in order to harden it.
  • the leaves of the same groove do not necessarily require the same burnishing force, due to the asymmetry of the groove.
  • the groove may have a radial face thicker than the other, and therefore a fillet is more easily “deformable" than the other.
  • the invention aims in particular to remedy the disadvantage mentioned.
  • the invention proposes a burnishing action tool of the type described above, characterized in that it comprises at least one abutment element, able to bear on a second lateral annular face of the groove, in order to compensate for the reaction force of the axial component of the rolling force exerted by the roller on the fillet.
  • the invention also relates to a rolling machine, characterized in that it comprises a tool made according to the teachings of the invention.
  • the figure 1 represents a rolling machine 10, of the type described in the document FR-A-2864460 , for the work hardening of a crankshaft 12 which is rotated relative to the machine 10 about its axis AA, by motor means (not shown).
  • crankshaft 12 partially shown in figure 2 , comprises a cylindrical annular groove 14 forming here a crank pin axis AA.
  • the groove 14 comprises two opposite rounded ridges 16a, 16b which each connect a flat annular radial face 17a, 17b with a convex annular axial cylindrical face 19 of the groove 14.
  • the machine 10 comprises respectively an upper tool 18 burnishing, said action, and a lower tool 20, said reaction.
  • the lower reaction tool 20 comprises a housing 22 of generally parallelepiped shape on which are mounted at two rotation wheels 24a, 24b of reaction, each around an axis parallel to the axis AA of the crankshaft 12, to oppose the burnishing force exerted by the action tool 18.
  • the two wheels 24a, 24b are spaced axially relative to each other to ensure good transmission to the crankshaft 12 and a good distribution of the reaction force.
  • Each reaction wheel 24a, 24b comprises an outer annular tread 26a, 26b which is able to cooperate by friction with the cylindrical face 19 of the groove 14.
  • the upper action tool 18 comprises a housing 30 of generally parallelepiped shape delimiting an inner housing 32 in which are received and arranged conventional means exerting a determined rolling force for the work hardening of the crankshaft 12.
  • the upper housing 30 has, in its first lateral face 28a or in its second lateral face 28b, an opening 34 allowing axial access to the inner housing 32.
  • the access opening 34 is closed by a cover 36 which is attached to the housing 30 and held by first fixing means 38.
  • the first fastening means 38 of the cover 36 are countersunk screws, for example slotted or with hexagon socket, which are received in complementary threaded holes (not shown) of the housing 30.
  • the conventional means for the roller burnishing are in particular arranged in a first lower lateral part of the housing 30 and comprise a roller 40 for hardening the groove 16a.
  • the roller 40 is retained between two stands 42a, 42b of support, each of which is intended to partially receive said roller 40, so that the roller 40 is rotatably mounted about an axis CC which is substantially inclined relative to the BB axis of the wheel 52.
  • the roller 40 is on the one hand mounted axially along the axis A-A rotation of the crankshaft 12 and is further mounted radially tight in the cages 42a, 42b.
  • each cage 42a, 42b is held in place transversely by a retaining flange 44a, 44b each of which is fixed to the housing 30 by means of second fixing means 46.
  • the roller 40 is advantageously made of a material such as steel, having a high hardness.
  • the second fixing means are preferably constituted by two screws 46 which each pass radially through a flange 44a, 44b and whose threaded body is received in a complementary threaded hole of the housing 30.
  • the action tool 18 comprises means of action which are arranged in the inner housing 32 and which are intended to exert a rolling force on the roller 40 hardening.
  • the means of action comprise an inner cylindrical hub 48 which is rotatably mounted in the housing 30 along an axis B-B parallel to the axis A-A of the crankshaft 12.
  • Rolling elements 50 forming a needle bearing, are interposed radially between the hub 48 and a reaction wheel 52, so that the wheel 52 is rotatably mounted about the axis B-B of the hub 48.
  • the wheel 52 comprises an annular peripheral portion 54 that cooperates with a complementary peripheral annular portion 56 of the roller 40, so that the wheel 52 is able to apply a roller-like force to the roller 40.
  • the roller 40 whose axis CC is substantially inclined, is able to exert on the connection fillet 16a a rolling force comprising a radial component and an axial component, along the axis BB of the wheel 52.
  • the action tool 18 comprises, in a side axially opposite to that of the roller 40, a roller 58 forming a stop element.
  • the roller 58 is able to roll on the associated planar annular radial face 17b of the fillet 16b of the groove 14, so as to compensate the reaction force of the axial component of the rolling force exerted by the roller 40 on the opposite fillet 16a. .
  • the roller 58 is a part of revolution of cylindrical or frustoconical shape of decreasing section downwards, that is to say towards the axis A-A of the crankshaft 12.
  • the roller 58 is rotatably mounted relative to the housing 30 of the tool 18 along an axis substantially orthogonal to the axis B-B of the wheel 52.
  • the roller 58 is mounted in a cage 61 for example, in the manner of needles rotatably mounted in a roller bearing cage.
  • the cage 61 is here fixed on the housing 30 by means of two screws 63, which are received in complementary threaded holes (not shown) of the housing 30.
  • the axis of rotation of the roller 58 is here substantially inclined so that the peripheral annular portion 59 of the roller 58 which cooperates with the radial face 17b of the groove 14 extends radially.
  • roller 58 may be rotatably mounted by means of a rod secured to the housing 30 for example, or by any other means allowing the roller 58 to be rotatably mounted relative to the housing 30.
  • the wheel 52 comprises a second annular portion 60 of rolling which is able to cooperate by friction with the annular peripheral portion 59 of the roller 58, so that the roller 58, while rolling, is able to transmit an axial force to the wheel 52.
  • the second annular rolling portion 60 of the wheel 52 is substantially inclined relative to a radial plane so that it is parallel to the annular portion 59 of the roller 58 with which it cooperates.
  • the action tool 18 comprises two or more rollers 58 which are each arranged symmetrically with respect to the roller 40.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polymerisation Methods In General (AREA)
  • Fertilizing (AREA)

Abstract

The tool (18) has a wheel (52) in a parallelepiped shaped housing (30) and in support on a pulley (40) having a burnishing strength on a cylindrical shaped annular groove (14) presenting a radial component and a component along an axis (B-B) of the wheel. A truncated conical shaped roller (58) forms an abutment element and is supported on an annular radial lateral face (17b) of the groove to compensate the reaction force of the axial component of the burnishing force applied by the pulley on a toroidal fillet (16a).

Description

L'invention concerne un outil de galetage d'un congé torique.The invention relates to a burnishing tool for an O-ring.

L'invention concerne plus particulièrement un outil d'action de galetage d'un congé torique de raccordement entre une face cylindrique délimitant le fond d'une rainure annulaire dans une pièce tournante et une première face annulaire latérale bordant la rainure, comportant dans un boîtier une roue en appui sur un galet dont la force de galetage sur la rainure présente une composante radiale et une composante selon l'axe de la roue.The invention more particularly relates to an action tool for burnishing an O-ring connection between a cylindrical face delimiting the bottom of an annular groove in a rotating part and a first lateral annular surface flanking the groove, comprising in a housing a wheel resting on a roller whose rolling force on the groove has a radial component and a component along the axis of the wheel.

On connaît de nombreuses machines de galetage dans l'état de la technique, notamment pour des applications de renforcement mécanique par écrouissage de certaines zones d'un vilebrequin de moteur à combustion interne de véhicule automobile.Numerous roller burnishing machines are known in the state of the art, in particular for applications of mechanical reinforcement by hardening of certain areas of a crankshaft of an internal combustion engine of a motor vehicle.

Un vilebrequin est une pièce mécanique se présentant sous la forme d'un arbre à plusieurs tronçons qui assure la transformation du mouvement rectiligne alternatif de l'ensemble pistons-bielles du moteur, en une rotation.A crankshaft is a mechanical part in the form of a multi-section shaft which ensures the transformation of the reciprocating rectilinear motion of the piston-rod assembly of the engine, into a rotation.

Chaque vilebrequin est dimensionné au plus juste afin d'optimiser les performances et l'encombrement du moteur associé, et sa forme et ses dimensions dépendent du nombre de cylindres, du nombre de paliers, de la course, de la disposition des cylindres et de l'ordre d'allumage.Each crankshaft is dimensioned most accurately to optimize the performance and size of the associated engine, and its shape and dimensions depend on the number of cylinders, the number of bearings, the stroke, the disposition of the cylinders and the ignition order.

Le vilebrequin est l'une des pièces les plus sollicitées du moteur. Les nombreuses sollicitations en torsion, en flexion, et en vibrations impliquent des problèmes de tenue en fatigue, et par conséquent des contraintes de fabrication importantes.The crankshaft is one of the most stressed parts of the engine. The numerous stresses in torsion, bending, and vibration imply fatigue resistance problems, and therefore significant manufacturing constraints.

Le document EP-A-0.168.153 , auquel on se reportera pour plus de détails, décrit et représente un exemple d'un vilebrequin réalisé en une seule pièce.The document EP-A-0168153 , which will be referred to for further details, described and represents an example of a crankshaft made in one piece.

Un tel vilebrequin comporte, de manière usuelle, d'une part des bras de manivelle s'étendant globalement radialement et délimités axialement par des faces latérales globalement orthogonales à l'axe de rotation du vilebrequin et, d'autre part, des tronçons cylindriques de maneton ou de tourillon dont chacun s'étend axialement à partir d'au moins une face latérale d'un bras de manivelle et est délimité par une surface cylindrique convexe usinée qui définit, avec ladite face latérale une zone annulaire de raccordement.Such a crankshaft comprises, in the usual manner, on the one hand hand crank arms extending generally radially and axially delimited by lateral faces generally orthogonal to the axis of rotation of the crankshaft and, secondly, cylindrical crankpin or trunnion sections, each of which extends axially from at least one lateral face of an arm crank and is delimited by a machined convex cylindrical surface which defines, with said side face an annular connection area.

Chaque zone annulaire de raccordement entre une surface cylindrique convexe usinée du maneton ou d'un tourillon, et une face latérale de bras de manivelle comporte un congé torique de manière à permettre entre autre un usinage de la surface cylindrique convexe, sans interférence avec les faces latérales des bras.Each annular zone of connection between a machined convex cylindrical surface of the crank pin or of a journal, and a crank arm side face comprises an O-ring so as to allow, among other things, machining of the convex cylindrical surface, without interference with the faces. side of the arms.

Or, on a pu déterminer que cette zone de raccordement et plus particulièrement la zone autour du congé torique d'usinage ou de raccordement, est une des zones du vilebrequin dans laquelle les contraintes mécaniques sont les plus élevées.However, it has been determined that this connection area and more particularly the area around the machining or connection toric discharge, is one of the areas of the crankshaft in which the mechanical stresses are highest.

Par conséquent, la qualité et la fiabilité du vilebrequin dépendent de la bonne tenue à la fatigue du vilebrequin dans ces zones de raccordement.Therefore, the quality and reliability of the crankshaft depend on the good fatigue life of the crankshaft in these connection areas.

C'est la raison pour laquelle, on procède habituellement à un écrouissage par galetage des congés de raccordement du vilebrequin, réalisé au moyen de deux galets simples qui « roulent » chacun dans un congé du vilebrequin entraîné en rotation par rapport à la machine et qui vont, notamment sous l'effet de la force de galetage exercée par la machine, écrouir ladite zone de raccordement.This is why, it usually proceeds to hardening by burning the connecting leaves of the crankshaft, achieved by means of two single rollers which "roll" each in a fillet of the crankshaft rotated relative to the machine and which go, especially under the effect of the roller burnishing force exerted by the machine, harden said connection area.

En effet, l'écrouissage permet de modifier la structure d'un matériau en imposant une déformation permanente à la surface de la pièce traitée pour en améliorer les propriétés mécaniques telles que la limite d'élasticité, la contrainte à la rupture, la dureté, la ductilité et la résilience.Indeed, hardening allows to modify the structure of a material by imposing a permanent deformation on the surface of the treated part to improve the mechanical properties such as yield strength, tensile stress, hardness, ductility and resilience.

Le document US-A-6.253.590 décrit et représente un exemple d'une machine pour l'écrouissage des congés de raccordement d'un vilebrequin de moteur à combustion interne par une opération de galetage.The document US Patent 6,253,590 describes and represents an example of a machine for cold-working the fillet of a crankshaft of an internal combustion engine by a roller burnishing operation.

De façon générale, une telle machine de galetage comporte :

  • un outil d'action qui comporte un boîtier d'action délimitant un logement intérieur dans lequel est monté à rotation une roue de réaction équipée d'une portion annulaire de roulement qui coopère avec une portion annulaire complémentaire d'au moins un galet de sorte que la roue est apte à appliquer une force de galetage au galet et que le galet est apte à exercer sur le congé de raccordement une force de galetage comportant une composante radiale et une composante axiale, selon l'axe de la roue,
  • un outil de réaction comportant des éléments roulants interposés radialement entre au moins une roue de réaction et un moyeu cylindrique.
In general, such a roller burnishing machine comprises:
  • an action tool which comprises an action housing delimiting an inner housing in which is rotatably mounted a reaction wheel equipped with an annular rolling portion which cooperates with a complementary annular portion of at least one roller so that the wheel is able to apply a rolling force to the roller and that the roller is able to exert on the fillet of connection a rolling force comprising a radial component and an axial component, along the axis of the wheel,
  • a reaction tool comprising rolling elements interposed radially between at least one reaction wheel and a cylindrical hub.

Plus particulièrement, l'outil d'action d'une telle machine comporte au moins un galet de chaque côté du boîtier, chaque galet appliquant une force égale de galetage sur chacun des deux congés de raccordement d'une rainure afin de l'écrouir.More particularly, the action tool of such a machine comprises at least one roller on each side of the housing, each roller applying an equal roller burnishing force on each of the two fillets of a groove in order to harden it.

Or, les congés d'une même rainure ne nécessitent pas systématiquement la même force de galetage, du fait de l'asymétrie de la rainure. Par exemple, la rainure peut comporter une face radiale plus épaisse que l'autre, et donc un congé de raccordement est plus facilement "déformable" que l'autre.However, the leaves of the same groove do not necessarily require the same burnishing force, due to the asymmetry of the groove. For example, the groove may have a radial face thicker than the other, and therefore a fillet is more easily "deformable" than the other.

Par conséquent, l'application d'une force de galetage égale sur chacun des deux congés opposés de la rainure est un inconvénient.Therefore, the application of an equal rolling force on each of the two opposite absences of the groove is a disadvantage.

L'invention vise notamment à remédier à l'inconvénient évoqué.The invention aims in particular to remedy the disadvantage mentioned.

Dans ce but, l'invention propose un outil d'action de galetage du type décrit précédemment, caractérisé en ce qu'il comporte au moins un élément de butée, apte à être en appui sur une seconde face annulaire latérale de la rainure, de façon à compenser la force de réaction de la composante axiale de la force de galetage exercée par le galet sur le congé.For this purpose, the invention proposes a burnishing action tool of the type described above, characterized in that it comprises at least one abutment element, able to bear on a second lateral annular face of the groove, in order to compensate for the reaction force of the axial component of the rolling force exerted by the roller on the fillet.

Selon d'autres caractéristiques de l'invention :

  • l'élément de butée est un rouleau dont l'axe de révolution est orthogonal à l'axe de la roue,
  • l'élément de butée est monté libre en rotation autour de son axe par rapport au boîtier,
  • l'élément de butée est un rouleau de forme tronconique,
  • la roue comporte une seconde portion annulaire de roulement qui est apte à coopérer avec une portion annulaire complémentaire de l'élément de butée, de sorte que l'élément de butée est apte à transmettre une force axiale à la roue,
  • la portion annulaire de roulement de la roue et la portion annulaire de roulement de l'élément de butée coopèrent entre elles par friction,
  • l'outil comporte une pluralité d'éléments de butée.
According to other features of the invention:
  • the stop element is a roller whose axis of revolution is orthogonal to the axis of the wheel,
  • the stop element is mounted free to rotate about its axis relative to the housing,
  • the stop element is a frustoconical shaped roll,
  • the wheel comprises a second annular rolling portion which is adapted to cooperate with a complementary annular portion of the stop element, so that the stop element is able to transmit an axial force to the wheel,
  • the annular rolling portion of the wheel and the annular rolling portion of the abutment element cooperate with one another by friction,
  • the tool has a plurality of stop members.

L'invention concerne aussi une machine de galetage, caractérisée en ce qu'elle comporte un outil réalisé conformément aux enseignements de l'invention.The invention also relates to a rolling machine, characterized in that it comprises a tool made according to the teachings of the invention.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels :

  • la figure 1 est une vue schématique de côté selon la direction axiale d'une machine comportant un outil supérieur d'action selon l'invention et un outil inférieur de réaction entre lesquels on a représenté, en section, la surface cylindrique convexe d'un maneton de vilebrequin;
  • la figure 2 est une vue schématique partielle en coupe transversale d'une machine selon la figure 1, illustrant l'écrouissage d'un congé de raccordement du vilebrequin par le galet ;
  • la figure 3 est une vue schématique partielle en coupe illustrant une variante de réalisation de l'outil supérieur d'action de la figure 1.
Other features and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:
  • the figure 1 is a schematic side view in the axial direction of a machine comprising a higher action tool according to the invention and a lower reaction tool between which there is shown, in section, the convex cylindrical surface of a crankpin crankpin ;
  • the figure 2 is a partial schematic cross-sectional view of a machine according to the figure 1 , illustrating the work hardening of a connection fillet of the crankshaft by the roller;
  • the figure 3 is a partial schematic sectional view illustrating an alternative embodiment of the upper action tool of the figure 1 .

Dans la description qui va suivre, des chiffres de référence identiques et d'indices "a" et "b" différents désignent des pièces ou des portions de pièces identiques ou ayant des fonctions similaires.In the following description, identical reference numerals and different indices "a" and "b" designate parts or portions of parts identical or having similar functions.

Par convention, et à titre non limitatif, on utilisera les termes "supérieur" ou "inférieur", "axial", "radial" ou "transversal" qui désignent des éléments ou des positions orientés respectivement selon la figure 1 vers le haut ou le bas, et selon l'axe de rotation du vilebrequin ou orthogonalement à celui-ci.By convention, and in a nonlimiting manner, the terms "upper" or "lower", "axial", "radial" or "transverse" which designate elements or positions oriented respectively according to figure 1 upwards or downwards, and depending on the axis of rotation of the crankshaft or orthogonally to it.

La figure 1 représente une machine 10 de galetage, du type de celle décrite dans le document FR-A-2.864.460 , pour l'écrouissage d'un vilebrequin 12 qui est entraîné en rotation par rapport à la machine 10 autour de son axe A-A, par des moyens moteurs (non représentés).The figure 1 represents a rolling machine 10, of the type described in the document FR-A-2864460 , for the work hardening of a crankshaft 12 which is rotated relative to the machine 10 about its axis AA, by motor means (not shown).

Le vilebrequin 12, représenté partiellement à la figure 2, comporte une rainure 14 annulaire cylindrique formant ici un maneton d'axe A-A.The crankshaft 12, partially shown in figure 2 , comprises a cylindrical annular groove 14 forming here a crank pin axis AA.

La rainure 14 comporte deux congés opposés 16a, 16b en forme de gorge circulaire qui raccordent chacune une face latérale radiale 17a, 17b annulaire plane avec une face cylindrique 19 axiale annulaire convexe de la rainure 14.The groove 14 comprises two opposite rounded ridges 16a, 16b which each connect a flat annular radial face 17a, 17b with a convex annular axial cylindrical face 19 of the groove 14.

La machine 10 comporte respectivement un outil 18 supérieur de galetage, dit d'action, et un outil inférieur 20, dit de réaction.The machine 10 comprises respectively an upper tool 18 burnishing, said action, and a lower tool 20, said reaction.

L'outil inférieur 20 de réaction comporte un boîtier 22 de forme globalement parallélépipédique sur lequel sont montés à rotation deux roues 24a, 24b de réaction, chacune autour d'un axe parallèle à l'axe A-A du vilebrequin 12, pour s'opposer à l'effort de galetage exercé par l'outil d'action 18.The lower reaction tool 20 comprises a housing 22 of generally parallelepiped shape on which are mounted at two rotation wheels 24a, 24b of reaction, each around an axis parallel to the axis AA of the crankshaft 12, to oppose the burnishing force exerted by the action tool 18.

Les deux roues 24a, 24b sont espacées axialement l'une par rapport à l'autre pour assurer une bonne transmission au vilebrequin 12 et une bonne répartition de l'effort de réaction.The two wheels 24a, 24b are spaced axially relative to each other to ensure good transmission to the crankshaft 12 and a good distribution of the reaction force.

Chaque roue 24a, 24b de réaction comporte une bande de roulement 26a, 26b annulaire extérieure qui est apte coopérer par friction avec la face cylindrique 19 de la rainure 14.Each reaction wheel 24a, 24b comprises an outer annular tread 26a, 26b which is able to cooperate by friction with the cylindrical face 19 of the groove 14.

L'outil 18 supérieur d'action comporte un boîtier 30 de forme globalement parallélépipédique délimitant un logement intérieur 32 dans lequel sont reçus et agencés des moyens conventionnels exerçant une force déterminée de galetage pour l'écrouissage du vilebrequin 12.The upper action tool 18 comprises a housing 30 of generally parallelepiped shape delimiting an inner housing 32 in which are received and arranged conventional means exerting a determined rolling force for the work hardening of the crankshaft 12.

Le boîtier supérieur 30 comporte, dans sa première face latérale 28a ou dans sa seconde face latérale 28b, une ouverture 34 permettant d'accéder axialement au logement intérieur 32.The upper housing 30 has, in its first lateral face 28a or in its second lateral face 28b, an opening 34 allowing axial access to the inner housing 32.

En fonctionnement, l'ouverture d'accès 34 est fermée par un couvercle 36 qui est rapporté sur le boîtier 30 et maintenu par des premiers moyens de fixation 38.In operation, the access opening 34 is closed by a cover 36 which is attached to the housing 30 and held by first fixing means 38.

De préférence, les premiers moyens de fixation 38 du couvercle 36 sont des vis à tête fraisée, par exemple fendue ou à six pans creux, qui sont reçues dans des trous taraudés complémentaires (non représentés) du boîtier 30.Preferably, the first fastening means 38 of the cover 36 are countersunk screws, for example slotted or with hexagon socket, which are received in complementary threaded holes (not shown) of the housing 30.

Les moyens conventionnels pour le galetage sont notamment agencés dans une première partie inférieure latérale du boîtier 30 et comportent un galet 40 d'écrouissage de la gorge 16a.The conventional means for the roller burnishing are in particular arranged in a first lower lateral part of the housing 30 and comprise a roller 40 for hardening the groove 16a.

Le galet 40 est retenu entre deux cages 42a, 42b de support, dont chacune est destinée à recevoir en partie ledit galet 40, de sorte que le galet 40 est monté à rotation autour d'un axe C-C qui est sensiblement incliné par rapport à l'axe B-B de la roue 52.The roller 40 is retained between two stands 42a, 42b of support, each of which is intended to partially receive said roller 40, so that the roller 40 is rotatably mounted about an axis CC which is substantially inclined relative to the BB axis of the wheel 52.

Avantageusement, le galet 40 est d'une part monté à jeu axial suivant l'axe A-A de rotation du vilebrequin 12 et est d'autre part monté serré radialement dans les cages 42a, 42b.Advantageously, the roller 40 is on the one hand mounted axially along the axis A-A rotation of the crankshaft 12 and is further mounted radially tight in the cages 42a, 42b.

En position de fonctionnement, chaque cage 42a, 42b est maintenue en place transversalement par une bride de retenue 44a, 44b dont chacune est fixée sur le boîtier 30 par l'intermédiaire de seconds moyens de fixation 46.In the operating position, each cage 42a, 42b is held in place transversely by a retaining flange 44a, 44b each of which is fixed to the housing 30 by means of second fixing means 46.

Le galet 40 est avantageusement réalisé dans un matériau tel que de l'acier, présentant une dureté élevée.The roller 40 is advantageously made of a material such as steel, having a high hardness.

Les seconds moyens de fixation sont de préférence constitués par deux vis 46 qui traversent chacune radialement une bride 44a, 44b et dont le corps fileté est reçu dans un trou taraudé complémentaire du boîtier 30.The second fixing means are preferably constituted by two screws 46 which each pass radially through a flange 44a, 44b and whose threaded body is received in a complementary threaded hole of the housing 30.

Plus précisément et comme on peut le voir sur la figure 2, l'outil 18 d'action comporte des moyens d'action qui sont agencés dans le logement intérieur 32 et qui sont destinés à exercer une force de galetage sur le galet 40 d'écrouissage.More precisely and as can be seen on the figure 2 , the action tool 18 comprises means of action which are arranged in the inner housing 32 and which are intended to exert a rolling force on the roller 40 hardening.

Conventionnellement, les moyens d'action comportent un moyeu cylindrique 48 intérieur qui est ici monté à rotation dans le boîtier 30 selon un axe B-B parallèle à l'axe A-A du vilebrequin 12.Conventionally, the means of action comprise an inner cylindrical hub 48 which is rotatably mounted in the housing 30 along an axis B-B parallel to the axis A-A of the crankshaft 12.

Des éléments roulants 50, formant un roulement à aiguilles, sont interposés radialement entre le moyeu 48 et une roue 52 de réaction, de sorte que la roue 52 est montée à rotation autour de l'axe B-B du moyeu 48.Rolling elements 50, forming a needle bearing, are interposed radially between the hub 48 and a reaction wheel 52, so that the wheel 52 is rotatably mounted about the axis B-B of the hub 48.

La roue 52 comporte une portion annulaire 54 périphérique de roulement qui coopère avec une portion annulaire 56 périphérique complémentaire du galet 40, de sorte que la roue 52 est apte à appliquer une force de galetage au galet 40.The wheel 52 comprises an annular peripheral portion 54 that cooperates with a complementary peripheral annular portion 56 of the roller 40, so that the wheel 52 is able to apply a roller-like force to the roller 40.

Plus particulièrement, le galet 40, dont l'axe C-C est sensiblement incliné, est apte à exercer sur le congé 16a de raccordement une force de galetage comportant une composante radiale et une composante axiale, selon l'axe BB de la roue 52.More particularly, the roller 40, whose axis CC is substantially inclined, is able to exert on the connection fillet 16a a rolling force comprising a radial component and an axial component, along the axis BB of the wheel 52.

L'outil 18 d'action comporte, dans un côté opposé axialement à celui du galet 40, un rouleau 58 formant élément de butée.The action tool 18 comprises, in a side axially opposite to that of the roller 40, a roller 58 forming a stop element.

Le rouleau 58 est apte à rouler sur la face radiale 17b annulaire plane associée du congé 16b de la rainure 14, de façon à compenser la force de réaction de la composante axiale de la force de galetage exercée par le galet 40 sur le congé 16a opposé.The roller 58 is able to roll on the associated planar annular radial face 17b of the fillet 16b of the groove 14, so as to compensate the reaction force of the axial component of the rolling force exerted by the roller 40 on the opposite fillet 16a. .

Avantageusement, le rouleau 58 est une pièce de révolution de forme cylindrique ou tronconique de section décroissante vers le bas, c'est-à-dire vers l'axe A-A du vilebrequin 12.Advantageously, the roller 58 is a part of revolution of cylindrical or frustoconical shape of decreasing section downwards, that is to say towards the axis A-A of the crankshaft 12.

Le rouleau 58 est monté à rotation par rapport au boîtier 30 de l'outil 18 selon un axe sensiblement orthogonal à l'axe B-B de la roue 52.The roller 58 is rotatably mounted relative to the housing 30 of the tool 18 along an axis substantially orthogonal to the axis B-B of the wheel 52.

A cet effet, le rouleau 58 est monté dans une cage 61 par exemple, à la manière d'aiguilles montées à rotation dans une cage de roulement à aiguilles.For this purpose, the roller 58 is mounted in a cage 61 for example, in the manner of needles rotatably mounted in a roller bearing cage.

La cage 61 est ici fixée sur le boîtier 30 au moyen de deux vis 63, qui sont reçues dans des trous taraudés complémentaires (non représentés) du boîtier 30.The cage 61 is here fixed on the housing 30 by means of two screws 63, which are received in complementary threaded holes (not shown) of the housing 30.

Plus précisément, l'axe de rotation du rouleau 58 est ici sensiblement incliné de sorte que la portion annulaire périphérique 59 du rouleau 58 qui coopère avec la face radiale 17b de la rainure 14 s'étend radialement.More specifically, the axis of rotation of the roller 58 is here substantially inclined so that the peripheral annular portion 59 of the roller 58 which cooperates with the radial face 17b of the groove 14 extends radially.

A titre non limitatif, le rouleau 58 peut être monté à rotation au moyen d'une tige solidaire du boîtier 30 par exemple, ou par tout autre moyen permettant au rouleau 58 d'être monté à rotation par rapport au boîtier 30.Without limitation, the roller 58 may be rotatably mounted by means of a rod secured to the housing 30 for example, or by any other means allowing the roller 58 to be rotatably mounted relative to the housing 30.

La roue 52 comporte une seconde portion annulaire 60 de roulement qui est apte à coopérer par friction avec la portion annulaire périphérique 59 du rouleau 58, de sorte que le rouleau 58, en roulant, est apte à transmettre une force axiale à la roue 52.The wheel 52 comprises a second annular portion 60 of rolling which is able to cooperate by friction with the annular peripheral portion 59 of the roller 58, so that the roller 58, while rolling, is able to transmit an axial force to the wheel 52.

Comme on peut le voir à la figure 2, la seconde portion annulaire 60 de roulement de la roue 52 est sensiblement inclinée par rapport à un plan radial de sorte qu'elle soit parallèle à la portion annulaire 59 du rouleau 58 avec la quelle elle coopère.As can be seen at figure 2 , the second annular rolling portion 60 of the wheel 52 is substantially inclined relative to a radial plane so that it is parallel to the annular portion 59 of the roller 58 with which it cooperates.

Selon une variante de réalisation de l'invention représentée à la figure 3, l'outil d'action 18 comporte deux ou plus de deux rouleaux 58 qui sont chacun agencés symétriquement par rapport au galet 40.According to an alternative embodiment of the invention shown in figure 3 , the action tool 18 comprises two or more rollers 58 which are each arranged symmetrically with respect to the roller 40.

Claims (8)

  1. Tool (18) for roller burnishing a toroidal fillet (16a) between a cylindrical face (19) defining the bottom of an annular groove (14) in a revolving part (12) and a first lateral annular face (17a) bordering the groove (14), comprising in a casing (30) a wheel (52) pressing on a roller (40) whose rolling force on the groove has a radial component and a component along the axis (B-B) of the wheel (52), characterized in that it comprises at least one stop component (58) able to press on a second lateral annular face (17b) of the groove (14) so as to counterbalance the reaction force of the axial component of the rolling force exerted by the roller (40) on the fillet (16a).
  2. Tool (18) according to Claim 1, characterized in that the stop component (58) is a barrel whose axis of revolution is perpendicular to the axis (B-B) of the wheel (52).
  3. Tool (18) according to Claim 2, characterized in that the stop component (58) is mounted so as to rotate freely about its axis with respect to the casing (30).
  4. Tool (18) according to any one of the preceding claims, characterized in that the stop component (58) is a tapered barrel.
  5. Tool (18) according to any one of the preceding claims, characterized in that the wheel (52) comprises a second annular rolling portion (60) that is able to engage with a complementary annular portion (59) on the stop component (58), so that the stop component (58) is able to transmit an axial force to the wheel (52).
  6. Tool (18) according to Claim 5, characterized in that the annular rolling portion (60) of the wheel (52) and the annular rolling portion (59) of the stop component (58) engage with each other by friction.
  7. Tool (18) according to any one of the preceding claims, characterized in that it comprises a plurality of stop components (58).
  8. Roller burnishing machine characterized in that it comprises a tool in accordance with one of the preceding claims.
EP07823820A 2006-10-24 2007-09-12 Tool for roller burnishing a toroidal fillet Not-in-force EP2086722B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0654474A FR2907359B1 (en) 2006-10-24 2006-10-24 TOOL FOR LAYING A TORIC LEAVE.
PCT/FR2007/051924 WO2008050012A1 (en) 2006-10-24 2007-09-12 Tool for roller burnishing a toroidal fillet

Publications (2)

Publication Number Publication Date
EP2086722A1 EP2086722A1 (en) 2009-08-12
EP2086722B1 true EP2086722B1 (en) 2011-01-05

Family

ID=38066495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07823820A Not-in-force EP2086722B1 (en) 2006-10-24 2007-09-12 Tool for roller burnishing a toroidal fillet

Country Status (5)

Country Link
EP (1) EP2086722B1 (en)
AT (1) ATE494100T1 (en)
DE (1) DE602007011801D1 (en)
FR (1) FR2907359B1 (en)
WO (1) WO2008050012A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2393517B1 (en) 2010-07-28 2013-11-21 Universidad Del Pais Vasco-Euskal Herriko Unibersitatea PROCEDURE FOR THE CONTRIBUTION OF METAL MATERIALS.
DE202011103888U1 (en) * 2011-07-28 2011-09-07 Hegenscheidt-Mfd Gmbh & Co. Kg Fixed roller

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2864460B1 (en) * 2003-12-31 2006-04-07 Renault Sas ROLLING MACHINE, IN PARTICULAR FOR THE NUTTING OF A CRANKSHAFT

Also Published As

Publication number Publication date
FR2907359B1 (en) 2008-12-26
DE602007011801D1 (en) 2011-02-17
EP2086722A1 (en) 2009-08-12
WO2008050012A1 (en) 2008-05-02
ATE494100T1 (en) 2011-01-15
FR2907359A1 (en) 2008-04-25

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