EP2086722B1 - Werkzeug zum prägepolieren einer toroidalen hohlkehle - Google Patents

Werkzeug zum prägepolieren einer toroidalen hohlkehle 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
Authority
EP
European Patent Office
Prior art keywords
tool
roller
wheel
annular
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07823820A
Other languages
English (en)
French (fr)
Other versions
EP2086722A1 (de
Inventor
Hatem Khanfir
Nicolas Massue
Gilles Yvenat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
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Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP2086722A1 publication Critical patent/EP2086722A1/de
Application granted granted Critical
Publication of EP2086722B1 publication Critical patent/EP2086722B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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.

Landscapes

  • 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)

Claims (8)

  1. Werkzeug (18) zur Rollierbearbeitung einer torischen Hohlkehle (16a) zur Verbindung zwischen einer zylindrischen Seite (19), die den Grund einer Ringnut (14) in einem drehenden Bauteil (12) begrenzt, und einer die Nut (14) umrandenden ersten ringförmigen Seitenfläche (17a), das in einem Gehäuse (30) ein Rad (52) in Auflage auf einer Rolle (40) aufweist, deren Rollierkraft auf der Nut eine radiale Komponente und eine Komponente gemäß der Achse (B-B) des Rads (52) aufweist, dadurch gekennzeichnet, dass es mindestens ein Anschlagelement (58) aufweist, das auf einer zweiten ringförmigen Seitenfläche (17b) der Nut (14) aufliegen kann, um die Reaktionskraft der axialen Komponente der von der Rolle (40) auf die Hohlkehle (16a) ausgeübten Rollierkraft zu kompensieren.
  2. Werkzeug (18) nach Anspruch 1, dadurch gekennzeichnet, dass das Anschlagelement (58) eine Walze ist, deren Drehsymmetrieachse orthogonal zur Achse (B-B) des Rads (52) ist.
  3. Werkzeug (18) nach Anspruch 2, dadurch gekennzeichnet, dass das Anschlagelement (58) bezüglich des Gehäuses (30) frei drehbar um seine Achse montiert ist.
  4. Werkzeug (18) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Anschlagelement (58) eine kegelstumpfförmige Walze ist.
  5. Werkzeug (18) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Rad (52) einen zweiten ringförmigen Rollabschnitt (60) aufweist, der mit einem komplementären ringförmigen Abschnitt (59) des Anschlagelements (58) zusammenwirken kann, damit das Anschlagelement (58) in der Lage ist, eine axiale Kraft auf das Rad (52) zu übertragen.
  6. Werkzeug (18) nach Anspruch 5, dadurch gekennzeichnet, dass der ringförmige Rollabschnitt (60) des Rads (52) und der ringförmige Rollabschnitt (59) des Anschlagelements (58) durch Reibung zusammenwirken.
  7. Werkzeug (18) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es mehrere Anschlagelemente (58) aufweist.
  8. Rolliermaschine, dadurch gekennzeichnet, dass sie ein Werkzeug nach einem der vorhergehenden Ansprüche aufweist.
EP07823820A 2006-10-24 2007-09-12 Werkzeug zum prägepolieren einer toroidalen hohlkehle Not-in-force EP2086722B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0654474A FR2907359B1 (fr) 2006-10-24 2006-10-24 Outil de galetage d'un conge torique.
PCT/FR2007/051924 WO2008050012A1 (fr) 2006-10-24 2007-09-12 Outil de galetage d'un conge torique

Publications (2)

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

Family

ID=38066495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07823820A Not-in-force EP2086722B1 (de) 2006-10-24 2007-09-12 Werkzeug zum prägepolieren einer toroidalen hohlkehle

Country Status (5)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2393517B1 (es) 2010-07-28 2013-11-21 Universidad Del Pais Vasco-Euskal Herriko Unibersitatea Procedimiento para la aportación de materiales metálicos.
DE202011103888U1 (de) * 2011-07-28 2011-09-07 Hegenscheidt-Mfd Gmbh & Co. Kg Festwalzrolle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2864460B1 (fr) * 2003-12-31 2006-04-07 Renault Sas Machine de galetage, notamment pour l'ecrouissage d'un vilebrequin

Also Published As

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

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