EP3670014A1 - Richtverfahren einer welle durch anwendung einer variablen radialen kaltverfestigungskraft auf die sich drehende welle - Google Patents

Richtverfahren einer welle durch anwendung einer variablen radialen kaltverfestigungskraft auf die sich drehende welle Download PDF

Info

Publication number
EP3670014A1
EP3670014A1 EP19212232.3A EP19212232A EP3670014A1 EP 3670014 A1 EP3670014 A1 EP 3670014A1 EP 19212232 A EP19212232 A EP 19212232A EP 3670014 A1 EP3670014 A1 EP 3670014A1
Authority
EP
European Patent Office
Prior art keywords
shaft
force
radial
straightening
intensity
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.)
Withdrawn
Application number
EP19212232.3A
Other languages
English (en)
French (fr)
Inventor
Baptiste Modard
Kevin Serpin
Romain Perseval
Vianney Bonhomme
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.)
Ampere SAS
Original Assignee
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP3670014A1 publication Critical patent/EP3670014A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/16—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means

Definitions

  • the invention relates to a method for straightening a metal shaft with a longitudinal axis, in particular a gearbox shaft of a motor vehicle or an electric motor shaft of a motor vehicle, which comprises a straightening step which consists of to plastically deform the shaft under the action of a radial work hardening force to reduce the deflection.
  • the shafts of a motor vehicle gearbox are highly stressed, in particular in friction and fatigue. To make them more resistant, they are subjected, during their production, to a heat treatment to harden their surface. This heat treatment is generally carried out on the tree when it generally has its final shape.
  • Such a heat treatment makes it possible to obtain a shaft whose metallic material has a hard surface layer and a soft and ductile core.
  • the thermal amplitudes to which the tree was subjected tended to create residual internal mechanical stresses. These last cause significant deformations of the tree, especially in bending.
  • the tree thus treated has an arrow which, very often, does not respect the manufacturing tolerances.
  • the tree thus has a concave side and a convex side.
  • straightening is carried out by placing the shaft on support anvils in a determined angular position in which the convex side of the shaft is oriented towards actuators, for example hydraulic cylinders.
  • the shaft is locked in this position and the actuators apply a punctual bending force at one or more fixed points on the convex side of the shaft to cause its bending, in a direction opposite to the arrow, in the plastic domain in order to restore to the tree a main axis generally rectilinear permanently.
  • the actuators are controlled to move over a sufficient stroke to allow plastic deformation of the shaft.
  • the actuator is capable of applying to the shaft an extremely high bending force, for example of the order of several tens of thousands of Newton, over a prolonged period.
  • a gearbox shaft 10 of nominal longitudinal “X0” axis This shaft 10 is intended to receive various elements such as fixed gears and / or mobile.
  • the shaft 10 is made of a metallic material such as steel.
  • it is an electric motor shaft for a motor vehicle, for example an electric motor traction motor.
  • the tree 10 represented in Figures 1A and 1B has a rectilinear main axis oriented longitudinally which is substantially coaxial with a nominal axis "X0" of the shaft.
  • the axis "X0" is defined as being a straight line which connects the center of the two end faces of the shaft 10.
  • This shaft 10 is intended to undergo a heat treatment to harden the surface.
  • a heat treatment includes a heating operation during which the shaft 10 is exposed to a high treatment temperature "Tt" followed by a quenching operation. It is for example a treatment by carbonitriding or a treatment by carburizing.
  • the treatment temperature "Tt" is very high, for example around 900 ° C.
  • the shaft 10 directly undergoes a quenching operation which suddenly drops its temperature, for example to a temperature of about 140 ° C.
  • the shaft 10 thus has a permanent arrow 12.
  • the deflection 12 is determined as being the radial offset distance from the real axis "X1" of the shaft 10 relative to the nominal rectilinear axis "X0" of the shaft 10 in an axial bending plane "P" passing through these two axes "X1" and “X0".
  • a distal longitudinal straight line 16 is defined formed by the intersection of the plane "P" of flexion with the external cylindrical surface of the determined section 14, the straight line 16 distal being furthest from the nominal "X0" axis, as shown at the top of the figure 2B .
  • proximal longitudinal straight line 18 formed by the intersection of the plane "P" of flexion with the external surface of the determined section 14, the proximal straight line 18 being closer to the nominal axis "X0" than the distal straight line 16, as shown at the bottom of the figure 2B .
  • the latter is installed in a straightening station 20 which includes a fixed frame 22 carrying a support for receiving the shaft 10.
  • the support comprises a tip 24A and a tailstock 24B which are aligned along the nominal axis "X0" of the shaft 10.
  • the tip 24A and the tailstock 24B can be applied to the center of each of the ends of the shaft 10.
  • the tip 24A and the tailstock 24B more particularly take the shaft 10 longitudinally in a vice, the tip 24A and the tailstock 24B being aligned in coincidence with the nominal axis "X0" of the shaft 10.
  • the tip 24A is mounted adjustable longitudinally in position to allow the longitudinal tightening of the shaft 10. After tightening , the tip 24A remains fixed longitudinally throughout the process.
  • the tip 24A and the tailstock 24B are rotatably mounted around their axis "X0".
  • the tip 24A is rotated by means not shown, such as an electric motor, the rotational movement being transmitted without sliding to the shaft 10, as indicated by the arrow "F" of the figure 3A .
  • the tailstock 24B is slidably mounted axially relative to the frame 22.
  • the tailstock 24B is here elastically constrained in the direction of the shaft 10, for example by means of an elastic member 25 which is mounted prestressed in compression between an element axially fixed relative to the frame 22 and the tailstock 24B.
  • the angular position of the arrow 12 of the shaft 10 is marked on at least one determined section 14 of the shaft 10.
  • This marking is for example carried out by means of a radial feeler 26 which is arranged in contact with the external cylindrical wall of the determined section 14 of the shaft 10.
  • the probe makes it possible to identify the angular position of the arrow 12 on the shaft 10.
  • the angular position and the amplitude of the arrow 12 are stored in an electronic control unit 28. It is thus possible to know at any time the angular position of the arrow 12 relative to the fixed frame 22.
  • step “E3” of straightening is triggered when the arrow 12 is greater than a predetermined tolerance threshold.
  • the purpose of step “E3” is to plastically deform the shaft 10 under the action of a radial hardening force "Br" to reduce the deflection 12 of the section 14 determined below the tolerance threshold, ideally for match the real "X1" axis with the nominal "X0" axis.
  • the straightening step "E3" is carried out on the straightening station 20. It consists in rotating the shaft 10 around the nominal "X0" axis relative to the fixed frame 22. During the rotation of the shaft 10, a radial strain hardening force "Br" is applied continuously to the determined section 14, in a direction of radial application which is fixed relative to the fixed frame 22.
  • the radial “hardening” force “Br” is applied by the free end of the rod 30 of a hydraulic force application device 31 sliding in a fixed direction relative to the frame 22.
  • the rod 31 is mounted sliding in a body 33 of the hydraulic force application device 31.
  • This is, without limitation, a hydraulic cylinder.
  • the rod 31 is slidably mounted in a body 33 of the hydraulic force application device 31.
  • the hydraulic force application device 31 is dimensioned to apply a force of several thousands of Newton, for example up to 20,000 N.
  • the free end of the hydraulic force application device 31 comprises an action roller 32 rotatably mounted around 'an axis "Y" which can be longitudinal or inclined with respect to the longitudinal direction.
  • the radial force “Br” of work hardening is applied by means of the action roller 32.
  • the action roller 32 thus rolls without interruption on the external cylindrical surface of the section 14 determined during its rotation over the entire duration of the straightening step "E3".
  • the force "B” applied by the hydraulic force application device 31 is slightly inclined in the axial plane relative to a purely radial direction because the force is applied at an angle formed between a cylindrical face of the shaft and a shoulder face of the shaft.
  • the radial strain hardening force "Br” is determined as being the radial component of the strain hardening force applied by the hydraulic force application device 31.
  • the hydraulic force application device is arranged so as to exert a purely radial force on the shaft.
  • the straightening station 22 advantageously comprises a reaction roller 34 which is arranged diametrically opposite the action roller 32.
  • This reaction roller 34 thus rolls on the cylindrical face of the section 14 determined opposite the action roller 32, as is particularly visible on the figure 4C .
  • the reaction roller 34 makes it possible in particular to guarantee that the shaft 10 remains in position between the tip 24A and the tailstock 24B and it also makes it possible to limit the bending deformation of the shaft 10 under the effect of the force. "Br" of hardening.
  • the reaction roller 34 is for example mounted to slide radially relative to the frame 22 and it is constrained against the determined section 14 (not shown) so as to be able to be in permanent contact with the shaft 10.
  • the reaction roller 35 applies a reaction " Rb "on the shaft 10 which is opposite to the straining effort" Br ".
  • the reaction roller 34 is for example mounted on a gantry 35 which is integral with the body 33 of the hydraulic device 31 for applying force.
  • the gantry 35 is mounted to slide freely parallel to the effort "Br" of work hardening on the frame 22 over a limited stroke. This thus makes it possible to pinch the section 14 determined between the action roller 32 and the reaction roller 34 when the force "Br" of work hardening is applied.
  • the maximum value "Bmax” is applied in coincidence with the maximum amplitude of the arrow, while the minimum amplitude "Bmin” is applied in coincidence with the minimum amplitude of the arrow.
  • the intensity of the radial hardening effort "Br" is thus controlled by the electronic control unit 28 as a function of the angular position of the arrow 12 and of the angular speed of the shaft 10.
  • the intensity varies cyclically at each shaft revolution 10 as shown in the figure 5 .
  • the minimum value "Bmin” of the radial strain hardening force "Br" applied during the straightening step "E3" is for example between 0 and 2000 N, for example 1500 N.
  • the maximum value "Bmax" of the radial strain hardening force "Br" applied during the straightening step "E3" is for example between 5000 N and 20000 N, for example 9000 N.
  • the minimum value "Bmin” of the intensity of the radial work hardening "Br” is here applied to a first angular sector “A1" determined from the surface of the determined section 14, extending symmetrically on either side other of the proximal line 18, that is to say on either side of the direction of the arrow.
  • the first angular sector “A1” here extends over a total angle of approximately 180 °, for example slightly greater than 180 °.
  • the maximum value "Bmax" of the intensity of the effort "Br” radial work hardening is here applied to a second angular sector “A2" determined from the surface of the determined section 14, extending symmetrically from one side and across the distal line 16.
  • the second angular sector “A2” extends here over a very small angle relative to that of the first angular sector "A1", for example around 20 °.
  • the first angular sector “A1" and the second angular sector “A2" are separated on both sides by two intermediate angular sectors "A3" which make it possible to gradually increase the value of the intensity of the force "Br” radial of work hardening from its minimum value “Bmin” to its maximum value “Bmax” after the passage of the first angular sector “A1” to the right of the direction of application, then gradually decreasing the value of the intensity of the effort "Br” radial work hardening from its maximum value "Bmax” to its minimum value "Bmin” after the passage of the second angular sector "A2" to the right of the direction of application.
  • the shaft 10 has an actual axis "X1" substantially coaxial with its nominal axis "X0", the deflection 12 then being reduced below the tolerance threshold, as shown in FIGS. Figures 6A and 6B .
  • the straightening step thus carried out makes it possible to straighten the shaft 10 by plastic deformation without damaging the shaft 10. This is due to the fact that, contrary to what is practiced in the state of the art, the force "Br" of radial hardening is applied to the contour of the moving shaft.
  • the stresses caused by the application of the maximum value "Bmax” of the force appear transiently and they disappear cyclically before having been able to cause damage to the structure of the material constituting the tree 10.
  • the fact of gradually increasing the value of the intensity makes it possible to avoid the sudden appearance of high stresses, thus protecting the structure of the material.
  • the method of the invention proposes to straighten the material which tends by strain hardening. to reduce the deflection by extending the shaft 10 in its longitudinal axis.
  • the value "Al1 + Al2" of elongation of the shaft 10 is, for example a value of approximately 0.09 mm, which is distributed longitudinally in both directions from the determined section 14 on which the straightening force is applied, as indicated by the references "Al1" and "Al2" of the figure 6A .
  • the value of this elongation depends on the shape, on the size and on the material of the shaft 10, as well as on the radial hardening forces "Br".
  • this method makes it possible to reduce the maximum value "Bmax" of the intensity of the force applied relative to the bending force applied in the methods of the prior art.
  • the rolling of the action roller 32 on the contour of the determined section 14 of the shaft 10 could cause the formation of a hollow path on the path of the action roller 32 by local crushing of the material.
  • the determined section 14 is selected so as to present a non-functional cylindrical surface, that is to say a surface which does not require a specific surface finish or a geometry shape of low tolerance.
  • the choice of such a determined section 14 ensures guiding of the rolling of the action roller 32 by contact with the shoulder face or with one of the lateral faces of the groove.
  • the method advantageously has a burnishing step "E2" which precedes the straightening step "E3". This is for example the case when the shaft 10 is made of a soft material.
  • the shaft 10 is rotated about its nominal axis "X0" without leaving the straightening station 20.
  • a substantially constant radial force "E” of burnishing is applied to the section 14 determined for several turns, for example 4 turns, in order to harden the cylindrical surface of the section 14 determined by burnishing.
  • the intensity of the radial burnishing force "E” here is less than or equal to the maximum value "Bmax" of the intensity of the radial work hardening force "Br".
  • the roller burnishing force "E” is applied by the hydraulic force application device 31 via the action roller 32. To prevent the application of the roller burnishing force "E” from causing an increase in the deflection 12 of the shaft 10, the roller burnishing force "E” is constant during the rotation of the shaft 10.
  • the straightening process carried out according to the teachings of the invention makes it possible to straighten shafts 10 by work hardening causing an elongation by plastic deformation in greatly reducing the risk of damage to the shaft 10, even when the shaft is short and / or has complex geometry.
  • this method increases the resistance to fatigue of the determined section 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Forging (AREA)
  • Heat Treatment Of Articles (AREA)
EP19212232.3A 2018-12-19 2019-11-28 Richtverfahren einer welle durch anwendung einer variablen radialen kaltverfestigungskraft auf die sich drehende welle Withdrawn EP3670014A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1873395A FR3090424B1 (fr) 2018-12-19 2018-12-19 Procédé de redressage d'un arbre par application d'un effort variable radial d'écrouissage sur l'arbre en rotation

Publications (1)

Publication Number Publication Date
EP3670014A1 true EP3670014A1 (de) 2020-06-24

Family

ID=66641063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19212232.3A Withdrawn EP3670014A1 (de) 2018-12-19 2019-11-28 Richtverfahren einer welle durch anwendung einer variablen radialen kaltverfestigungskraft auf die sich drehende welle

Country Status (2)

Country Link
EP (1) EP3670014A1 (de)
FR (1) FR3090424B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114247820A (zh) * 2022-01-11 2022-03-29 福建永强力加动力设备有限公司 管件弯折角度纠正装置及其纠正方法
DE102022210175A1 (de) * 2022-09-27 2024-03-28 Volkswagen Aktiengesellschaft Verfahren zum Herstellen einer Antriebswelle, Biegerichteinrichtung und Antriebswelle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860566A (en) * 1987-01-17 1989-08-29 Hans-Georg Augustin Method and apparatus for straightening a workpiece
US5001917A (en) * 1987-07-13 1991-03-26 W. Hegenscheidt Gesellschaft Mbh Method and apparatus for truing or straightening out of true work pieces
DE102005032185A1 (de) * 2005-07-09 2007-01-18 Volkswagen Ag Verfahren zur Erhöhung der Dauerfestigkeit von Kurbelwellen
EP2654987A1 (de) * 2010-12-23 2013-10-30 Hegenscheidt-MFD GmbH & Co. KG Verfahren zum richtwalzen von kurbelwellen
DE102014007396A1 (de) * 2014-05-20 2014-12-04 Daimler Ag Verfahren und Vorrichtung zum Biegerichten eines wellenförmigen Bauteils

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860566A (en) * 1987-01-17 1989-08-29 Hans-Georg Augustin Method and apparatus for straightening a workpiece
US5001917A (en) * 1987-07-13 1991-03-26 W. Hegenscheidt Gesellschaft Mbh Method and apparatus for truing or straightening out of true work pieces
DE102005032185A1 (de) * 2005-07-09 2007-01-18 Volkswagen Ag Verfahren zur Erhöhung der Dauerfestigkeit von Kurbelwellen
EP2654987A1 (de) * 2010-12-23 2013-10-30 Hegenscheidt-MFD GmbH & Co. KG Verfahren zum richtwalzen von kurbelwellen
EP2654987B1 (de) * 2010-12-23 2016-10-05 Hegenscheidt-MFD GmbH & Co. KG Verfahren zum richtwalzen von kurbelwellen
DE102014007396A1 (de) * 2014-05-20 2014-12-04 Daimler Ag Verfahren und Vorrichtung zum Biegerichten eines wellenförmigen Bauteils

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114247820A (zh) * 2022-01-11 2022-03-29 福建永强力加动力设备有限公司 管件弯折角度纠正装置及其纠正方法
DE102022210175A1 (de) * 2022-09-27 2024-03-28 Volkswagen Aktiengesellschaft Verfahren zum Herstellen einer Antriebswelle, Biegerichteinrichtung und Antriebswelle

Also Published As

Publication number Publication date
FR3090424B1 (fr) 2021-04-09
FR3090424A1 (fr) 2020-06-26

Similar Documents

Publication Publication Date Title
EP2757423B1 (de) Bauteil für Uhrwerk
EP1405926B1 (de) Vorrichtung zum Induktionshärten, insbesondere zum Herstellen von Aufhängungselementen
EP3670014A1 (de) Richtverfahren einer welle durch anwendung einer variablen radialen kaltverfestigungskraft auf die sich drehende welle
EP0648953B1 (de) Verbesserungen an metallischen Torsionsstäben
WO2016092214A1 (fr) Procede de montage d'un embout de connexion d'une conduite tubulaire flexible et dispositif permettant de mettre en oeuvre ce procede
CH707504A2 (fr) Axe de pivotement en métal pour mouvement horloger et procédé de fabrication d'un tel axe.
EP3713783B1 (de) Verfahren zur herstellung eines stabilisators für ein fahrzeug
EP0422992B1 (de) Stange mit erhöhtem Knickvermögen und Anwendung derselben, insbesondere in Kraftfahrzeug-Lenkungen
FR2687341A1 (fr) Procede de galetage de pieces metalliques, en particulier de roues en alliage leger, et dispositif de mise en óoeuvre dudit procede.
CH620380A5 (de)
FR2989934A1 (fr) Rayon pour roue de cycle et roue de cycle comportant un tel rayon
EP2903810A1 (de) Vorrichtung und verfahren zur herstellung einer reifenkomponente aus rohgummi
WO2011124846A1 (fr) Traitement d'une canne chauffante destinee a un pressuriseur du circuit primaire d'un reacteur nucleaire
FR2517226A1 (fr) Perfectionnements aux procedes et dispositifs de fabrication des segments d'etancheite pour pistons
EP4521172A1 (de) Werkzeug und verfahren zur trennung von spiralfedern nach dem gleiten und wärmebehandlung
CH707505B1 (fr) Axe de pivotement en métal pour mouvement horloger et procédé de fabrication d'un tel axe.
FR2790691A1 (fr) Perfectionnements aux machines de galetage, notamment pour le vilebrequin d'un moteur de vehicule automobile
EP3623486A1 (de) Ausrichtungsverfahren einer metallwelle, das eine lokalisierte anlassphase umfasst
FR2537893A1 (fr) Machine a dresser des tubes ou des barres, dont les outils de dressage consistent en au moins un cylindre creux a surface interne convexe
EP3883795A1 (de) Stabilisierungsstange für ein fahrzeug
EP2903809B1 (de) Verfahren zur herstellung einer wand einer vorrichtung zur herstellung eines profils eines reifengehäuses
FR2935107A1 (fr) Procede et dispositif de transformation d'une feuille de tissu en materiau composite thermoplastique
WO2019149550A1 (fr) Procédé de réalisation d'une traverse tubulaire d'essieu non trempée comportant une étape de grenaillage
EP2903808A1 (de) Vorrichtung zur herstellung eines profils eines reifengehäuses
FR2867816A1 (fr) Bague d'arret pour barre stabilisatrice d'une suspension de vehicule automobile et procede de montage

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20201214

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: RENAULT S.A.S

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: RENAULT S.A.S

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20230404

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BONHOMME, VIANNEY

Inventor name: PERSEVAL, ROMAIN

Inventor name: SERPIN, KEVIN

Inventor name: MODARD, BAPTISTE

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230608

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: AMPERE SAS

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20251122