EP1539393B1 - Press for tube notching provided with a mandrel which is arranged inside said tube and a piece corresponding to produced notch - Google Patents

Press for tube notching provided with a mandrel which is arranged inside said tube and a piece corresponding to produced notch Download PDF

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Publication number
EP1539393B1
EP1539393B1 EP03787849A EP03787849A EP1539393B1 EP 1539393 B1 EP1539393 B1 EP 1539393B1 EP 03787849 A EP03787849 A EP 03787849A EP 03787849 A EP03787849 A EP 03787849A EP 1539393 B1 EP1539393 B1 EP 1539393B1
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EP
European Patent Office
Prior art keywords
tube
notching
mandrel
notches
tubes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03787849A
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German (de)
French (fr)
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EP1539393A1 (en
Inventor
Jean-Claude Blanchet
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.)
Numalliance SAS
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Numalliance SAS
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Publication date
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    • 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
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/025—Stamping using rigid devices or tools for tubular articles
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

Definitions

  • the present invention relates to a tool according to the preamble of claim 1 (see for example JP-A-58218339) and a machine using such a tool for the notching of a tube, in particular a headrest reinforcement tube for motor vehicle.
  • the invention applies in particular, but not exclusively to height adjustable headrests whose armature is composed of two parallel branches, at least one of which has a plurality of notches each defining a position of adjustment of the support. while performing one of the following functions: anti-ejection in maximum-lift position, stroke adjustment, maximum low hold.
  • the cylindrical mandrel comprises a modified area: the section of the mandrel (6) necessarily has on the one hand a flat area (7) in a plane parallel to the longitudinal direction (10) of the mandrel and making anvil function during stamping, and secondly two side blanks (8,9) for example (but not necessarily) arranged symmetrically with respect to the vertical median plane (11) of the mandrel so as to clear on each side mandrel an expansion volume (12, 13).

Abstract

The invention relates to a press for tube notching provided with at least one tool which comprises the following elements: an internal fixed matrix in the form of a semishell whose inner cavity contours the external semicylindrical surface of a tube to be notched (2), a clamp frame device for suitably clamping the tube (2) or two tubes simultaneously, at least one upper punch (3) whose extremity (4) has a shape corresponding to the shape of a notch (5) to be produced, a mandrel (6) which is introduced into the tube to be notched in such a way that it can form in the inner cavity thereof a volume or volumes for material expansion resulting from stamping.

Description

La présente invention concerne un outil selon le preambule de la revendication 1 (voir par exemple JP-A-58218339) et une machine utilisant un tel outil pour le crantage d'un tube, notamment un tube d'armature d'appui-tête pour véhicule automobile.The present invention relates to a tool according to the preamble of claim 1 (see for example JP-A-58218339) and a machine using such a tool for the notching of a tube, in particular a headrest reinforcement tube for motor vehicle.

L'invention s'applique en particulier, mais non limitativement aux appuis-tête réglables en hauteur dont l'armature est composée de deux branches parallèles dont l'une au moins comporte une pluralité de crans chacun définissant une position de réglage de l'appui-tête tout en remplissant l'une des fonctions suivantes : anti-éjection en position levée-maximum, réglage en cours de course, retenue basse maximum.The invention applies in particular, but not exclusively to height adjustable headrests whose armature is composed of two parallel branches, at least one of which has a plurality of notches each defining a position of adjustment of the support. while performing one of the following functions: anti-ejection in maximum-lift position, stroke adjustment, maximum low hold.

Différents profils de tels crans sont schématisés en figure 1 et l'un des crans d'extrémité, à profil orthogonal, est dessiné en détail en figure 2.Different profiles of such notches are shown schematically in FIG. 1 and one of the end notches, with orthogonal profile, is drawn in detail in FIG.

Pour le maintien de l'appui-tête, ces crans coopèrent avec des loquets intégrés dans des douilles de guidage prévues en haut du dossier du siège.For the maintenance of the headrest, these notches cooperate with latches integrated in guide bushes provided at the top of the seat back.

Sur des tiges métalliques pleines ces crans sont facilement réalisés quel que soit leur profil par exemple par usinage, ou par déformation à froid (estampage).On solid metal rods these notches are easily made whatever their profile for example by machining, or by cold deformation (stamping).

Par souci d'allègement et comme pour de nombreux composants intégrés dans l'automobile, les armatures d'appui-tête passent progressivement d'une exécution en tige ou fil vers une exécution en tube pour laquelle se posent des problèmes de réalisation des crans.For the sake of lightening and as for many components integrated in the automobile, the headrest frames gradually move from a rod or wire execution to a tube execution for which there are problems of realization of the notches.

Le procédé d'usinage des crans reste applicable aux tubes par fraisage ou brochage si l'épaisseur du tube le permet et si l'affaiblissement de section confère au produit une rigidité et une résistance conformes aux exigences de rigidité. L'inconvénient majeur de ce procédé est par conséquent d'être limité à certains dimensionnements de tubes.The machining process of the notches remains applicable to the tubes by milling or broaching if the thickness of the tube allows it and if the weakening of section confers on the product a rigidity and a resistance corresponding to the requirements of rigidity. The major disadvantage of this process is therefore to be limited to certain dimensions of tubes.

Par ailleurs pour appliquer aux tubes le procédé d'estampage, il faut résoudre plusieurs problèmes à savoir :

  • limiter l'effondrement de la paroi du tube estampé afin de conserver une arrête fonctionnelle efficace entre le flanc souvent vertical du cran et la génératrice du tube,
  • faire en sorte que le métal déplacé n'augmente pas le diamètre externe. du tube et contribue le plus possible à la rigidité de la zone travaillée.
Moreover, to apply the stamping process to the tubes, several problems must be solved, namely:
  • limit the collapse of the wall of the stamped tube in order to maintain an effective functional stop between the often vertical flank of the notch and the generatrix of the tube,
  • to ensure that the displaced metal does not increase the outer diameter. of the tube and contributes as much as possible to the rigidity of the area worked.

Une solution par emboutissage du tube est proposée dans le document DE 29714315 et elle consiste à introduire un manchon dans la zone du tube où les crans doivent être formés, pour faciliter la formation des crans, mais ce manchon ne constitue pas un outil mais un insert résidant dans la pièce. Une autre solution décrite dans le document EP 97 4409 permet de réaliser un cran par martelage mais le temps d'opération est relativement long et la machine de mise en oeuvre est compliquée et chère.A stamping solution of the tube is proposed in the document DE 29714315 and it consists in introducing a sleeve into the zone of the tube where the notches must be formed, to facilitate the formation of the notches, but this sleeve does not constitute a tool but an insert. residing in the room. Another solution described in document EP 97 4409 makes it possible to achieve a notch by hammering. but the operation time is relatively long and the implementation machine is complicated and expensive.

L'invention vise à pallier les inconvénients précités et à proposer une machine apte à réaliser plusieurs crans simultanément dans la paroi d'un tube, sans restriction de forme.The invention aims to overcome the aforementioned drawbacks and to provide a machine capable of making several notches simultaneously in the wall of a tube, without restriction of shape.

Ce but est atteint par l'invention par un outil de crantage d'un tube, avec les caractéristiques de la revendication 1. Les revendications 2 et 3 définissent des modes de réalisation préférés de l'invention. Une machine de crantage comprenant au moins un outil selon l'invention est définie à la revendication 4.This object is achieved by the invention by a tube detent tool, with the features of claim 1. Claims 2 and 3 define preferred embodiments of the invention. A notching machine comprising at least one tool according to the invention is defined in claim 4.

On comprendra mieux l'invention à l'aide de la description faite en référence aux figures suivantes :

  • figure 1 : représentation schématique d'une branche d'armature d'appui tête comportant une série de crans de différents profils,
  • figure 2 : cran d'extrémité à profil orthogonal,
  • figure 3 : schéma de principe de la partie innovante d'une machine selon l'invention,
  • figure 4 : section verticale selon AA de la figure 3.
The invention will be better understood from the description given with reference to the following figures:
  • FIG. 1: schematic representation of a head support armature branch comprising a series of notches of different profiles,
  • FIG. 2: end notch with orthogonal profile,
  • FIG. 3: block diagram of the innovative part of a machine according to the invention,
  • FIG. 4: vertical section along AA in FIG.

Une machine selon un mode devicalisation préféré de l'invention est constituée essentiellement d'une presse sur laquelle est montée au moins un outil de crantage (1) spécifique à l'invention et qui comporte les éléments suivants :

  • une matrice inférieur fixe non représentée et en forme de demi coquille dont la cavité interne est -apte à épouser la forme extérieure-demi cylindrique d'un tube à cranter (2),
  • un dispositif serre flan du type à ressort ou à actionnement par vérins séparés, pour assurer un bridage approprié d'un tube (2) ou deux tubes simultanément,
  • au moins un poinçon supérieur (3) mobile dont l'extrémité est conformée selon une forme complémentaire (4) inverse de celle d'un des crans (5) à réaliser, et apte à se déplacer perpendiculairement à l'axe longitudinal du tube,
  • un mandrin (6) apte à être introduit à l'intérieur du tube à cranter et dont la section à été prévue pour résoudre les problèmes d'exécution tels qu'il sera expliqué plus loin.
A machine according to a preferred devicalization mode of the invention consists essentially of a press on which is mounted at least one notching tool (1) specific to the invention and which comprises the following elements:
  • a fixed lower die which is not shown and which is in the form of a half-shell, the internal cavity of which is able to conform to the outer half-cylindrical shape of a craning tube (2),
  • a spring-type flanged device or actuated by separate cylinders, to ensure proper clamping of a tube (2) or two tubes simultaneously,
  • at least one movable upper punch (3) whose end is shaped in a complementary shape (4) opposite to that of one of the notches (5) to achieve, and able to move perpendicular to the longitudinal axis of the tube,
  • a mandrel (6) adapted to be inserted inside the sleeve tube and whose section has been provided to solve the problems of execution as will be explained later.

Si la machine est destinée au crantage d'armatures en forme de U à deux branches parallèles, elle peut comporter deux outils de crantage (1) tels que décrits ci-dessus.If the machine is intended to notch U-shaped armatures with two parallel branches, it may comprise two notching tools (1) as described above.

De même chaque outil de crantage peut également être prévu pour comporter plusieurs poinçons supérieurs (3) alignés, chacun destiné à la réalisation d'un des crans d'une même branche (2) de l'armature, et actionnés simultanément lors d'une même opération d'estampage.Similarly, each notching tool can also be provided to include a plurality of upper punches (3) aligned, each intended for the realization of one of the notches of one and the same armature branch (2), and actuated simultaneously during a same stamping operation.

On se rapporte à présent à la figure 4 montrant la section appropriée d'un mandrin selon l'invention.Referring now to Figure 4 showing the appropriate section of a mandrel according to the invention.

Le problème à résoudre lors de l'exécution d'un cran par estampage avec un mandrin remplissant totalement la cavité d'un tube résulte du déplacement d'un volume de métal provoquant :

  • un allongement du tube (2) concerné, car l'effort de bridage exercé par le serre flan est calculé de façon à s'opposer à tout gonflement diamétral dudit tube,
  • une contrainte élevée appliquée au mandrin du fait des efforts de pliage du métal.
The problem to solve when executing a notch by stamping with a mandrel completely filling the cavity of a tube results from the displacement of a volume of metal causing:
  • an elongation of the tube (2) concerned, because the clamping force exerted by the blank greenhouse is calculated so as to oppose any diametral swelling of said tube,
  • a high stress applied to the mandrel due to the bending forces of the metal.

Afin d'éviter ces inconvénients l'invention prévoit d'utiliser un mandrin dont la section ne remplit pas la totalité de la cavité interne du tube, de façon à réserver un ou des volumes pour l'expansion de matière, et à pouvoir être extrait du tube après l'estampage.In order to avoid these drawbacks, the invention provides for the use of a mandrel the section of which does not fill the whole of the internal cavity of the tube, so as to reserve one or more volumes for the expansion of material, and to be able to be extracted of the tube after stamping.

Au niveau de la zone à estamper, le mandrin cylindrique comporte une zone modifiée : la section du mandrin (6) présente nécessairement d'une part une zone plane (7) selon un plan parallèle à la direction longitudinale (10) du mandrin et faisant fonction d'enclume lors de l'estampage, et d'autre part deux flans latéraux (8,9) par exemple (mais non obligatoirement) disposés symétriquement par rapport au plan médian (11) vertical du mandrin de façon à dégager de chaque côté du mandrin un volume d'expansion (12, 13).At the level of the area to be stamped, the cylindrical mandrel comprises a modified area: the section of the mandrel (6) necessarily has on the one hand a flat area (7) in a plane parallel to the longitudinal direction (10) of the mandrel and making anvil function during stamping, and secondly two side blanks (8,9) for example (but not necessarily) arranged symmetrically with respect to the vertical median plane (11) of the mandrel so as to clear on each side mandrel an expansion volume (12, 13).

Préférentiellement, mais non limitativement, les deux flans sont plans et déterminent entre eux un angle prédéterminé (α).Preferably, but not exclusively, the two blanks are planar and determine between them a predetermined angle (α).

La largeur (d) de l'enclume et l'angle prédéterminée (α) sont calculés en fonction des dimensionnements du tube et du cran à obtenir tout en garantissant la rigidité et la sécurité souhaitées.The width (d) of the anvil and the predetermined angle (α) are calculated according to the dimensions of the tube and the notch to be obtained while ensuring the desired rigidity and safety.

A titre d'exemple pour un tube de diamètre extérieur 12 mm et d'épaisseur 2 mm, le mandrin présente un diamètre externe de 7,9 mm dans ces parties cylindriques, et dans les parties actives une enclume de largeur (d) = 3 mm pour un angle (α) de 60°.By way of example for a tube with an outside diameter of 12 mm and a thickness of 2 mm, the mandrel has an outside diameter of 7.9 mm in these cylindrical parts, and in the active parts an anvil of width (d) = 3 mm for an angle (α) of 60 °.

En outre, une machine utilisant l'invention est une presse comportant au moins un outil de crantage selon l'invention et des moyens pour déplacer et positionner un mandrin dans un tube à cranter, selon son axe longitudinal, dans un sens ou dans l'autre.In addition, a machine using the invention is a press comprising at least one notching tool according to the invention and means for moving and positioning a mandrel in a cranberry tube, along its longitudinal axis, in one direction or in the other.

Claims (4)

  1. Notching tool (1) for notching a tube (2), more especially but not limitingly for notching one or two tubes of a head support framework for a motor vehicle of the type comprising the following elements:
    - a lower matrix, fixed and in the shape of a half-shell, the internal cavity of which is capable of marrying-up with the semi-cylindrical exterior shape of a tube to be notched (2),
    - a tight blank device, to ensure an appropriate clamping of one tube (2) or two tubes simultaneously,
    - at least one upper punch (3), the end of which is shaped in a reverse complementary shape (4) to that of one of the notches (5) to be produced, and
    - a mandrel (6) capable of being introduced into the interior of the tube to be notched,
    characterised in that the cylindrical mandrel comprises a modified zone and has a planar zone (7) along a plane parallel to the longitudinal direction (10) of the mandrel and fulfilling the function of an anvil during the stamping on the one hand and, on the other hand, two lateral blanks (8, 9), so as to free on each side of the mandrel an expansion volume (12, 13).
  2. Notching tool according to claim 1, characterised in that the tight blank device is of the spring type or the type actuated by separate jacks.
  3. Notching tool according to claim 2, characterised in that the two blanks are planar and form therebetween a predetermined angle (α).
  4. Notching machine (1) for notching a tube (2), more especially but not limitingly for notching one or two tubes of a head support framework for a motor vehicle, characterised in that it is made up of a press comprising at least one tool according to one of claims 1 to 3 for achieving the notches by stamping.
EP03787849A 2002-07-29 2003-07-11 Press for tube notching provided with a mandrel which is arranged inside said tube and a piece corresponding to produced notch Expired - Lifetime EP1539393B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0209637 2002-07-29
FR0209637A FR2842752B1 (en) 2002-07-29 2002-07-29 PRESS FOR THE CRANTAGE OF A TUBE COMPRISING IN COMBINATION A CHUCK INTRODUCED INSIDE THE TUBE AND A PIECE CONFORMED ACCORDING TO THE CRAN TO BE MADE.
PCT/FR2003/002187 WO2004016367A1 (en) 2002-07-29 2003-07-11 Press for tube notching provided with a mandrel which is arranged inside said tube and a piece corresponding to produced notch

Publications (2)

Publication Number Publication Date
EP1539393A1 EP1539393A1 (en) 2005-06-15
EP1539393B1 true EP1539393B1 (en) 2006-08-09

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EP03787849A Expired - Lifetime EP1539393B1 (en) 2002-07-29 2003-07-11 Press for tube notching provided with a mandrel which is arranged inside said tube and a piece corresponding to produced notch

Country Status (7)

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EP (1) EP1539393B1 (en)
AT (1) ATE335557T1 (en)
AU (1) AU2003264713A1 (en)
DE (1) DE60307484T2 (en)
ES (1) ES2270149T3 (en)
FR (1) FR2842752B1 (en)
WO (1) WO2004016367A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005027584A1 (en) * 2005-06-14 2006-12-28 Ulrich Huperz Schweißtechnik GmbH & Co.KG Tool for swarf-free production of workpiece produces workpiece with groove extending at least from top to bottom of workpiece
DE102007033604B3 (en) 2007-07-17 2009-01-22 Muhr Und Bender Kg Head rest carrying element
RU2481169C2 (en) * 2011-07-21 2013-05-10 Открытое акционерное общество "Новосибирский завод химконцентратов" Automatic moulding machine for forming ledges in tubular billet
FR2991893B1 (en) * 2012-06-15 2015-01-02 Numalliance TUBE CRUNCHING METHOD AND ASSOCIATED CRYSTATING MACHINE

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58218339A (en) * 1982-06-11 1983-12-19 Daido Steel Co Ltd Steering rod for vehicle and its manufacture
JPH08174126A (en) * 1994-12-27 1996-07-09 Showa:Kk Device for manufacturing rack shaft
JP3995182B2 (en) * 1999-12-27 2007-10-24 高周波熱錬株式会社 Method and apparatus for manufacturing hollow rack bar
JP2001239340A (en) * 2000-02-29 2001-09-04 Aisin Seiki Co Ltd Supporting bar and its manufacturing method

Also Published As

Publication number Publication date
FR2842752A1 (en) 2004-01-30
DE60307484T2 (en) 2007-03-29
WO2004016367A1 (en) 2004-02-26
FR2842752B1 (en) 2005-02-11
ATE335557T1 (en) 2006-09-15
EP1539393A1 (en) 2005-06-15
DE60307484D1 (en) 2006-09-21
AU2003264713A1 (en) 2004-03-03
ES2270149T3 (en) 2007-04-01

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