EP0323931A1 - Method and tooling equipment for making forged rivets - Google Patents

Method and tooling equipment for making forged rivets Download PDF

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Publication number
EP0323931A1
EP0323931A1 EP89400023A EP89400023A EP0323931A1 EP 0323931 A1 EP0323931 A1 EP 0323931A1 EP 89400023 A EP89400023 A EP 89400023A EP 89400023 A EP89400023 A EP 89400023A EP 0323931 A1 EP0323931 A1 EP 0323931A1
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EP
European Patent Office
Prior art keywords
ejector
rivet
blank
stamping
cavity
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EP89400023A
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German (de)
French (fr)
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EP0323931B1 (en
Inventor
Bernard Albert Marie Colin
Michel Antoine Claudius Cortey
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Airbus Group SAS
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Airbus Group SAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/08—Accessories for handling work or tools
    • B21J13/14—Ejecting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/58—Making machine elements rivets

Definitions

  • the present invention relates generally to riveted mechanical assemblies and it relates more particularly to a new industrial process for manufacturing rivets by stamping.
  • the current method of manufacturing rivets by stamping has drawbacks in that following this operation, and the fact that the rivet is driven from the impression of the matrix by an ejector exerting pressure on a part of its end , the latter is deformed, which causes the appearance of disturbances liable to give rise to cracks or cracks when this end is crushed during the riveting operation, which significantly reduces the mechanical characteristics and is very harmful to the corrosion resistance of the rivet obtained.
  • the object of the invention is to remedy these drawbacks by providing an industrial process and a tool for manufacturing rivets by stamping, making it possible to avoid the appearance of these disturbances and of the vices which result therefrom.
  • the subject of the invention is therefore an industrial process for manufacturing rivets by stamping a cylindrical blank in an impression of a matrix, in which one end of said blank is placed in abutment against a hollow surface of almost complementary shape to that of the rivet to be obtained, said hollow surface being formed at the end of a cylindrical member forming an ejector, housed in the cavity, and the geometry of the hollow surface of which is variable under the force of the applied stamping pressure at the other end of the blank, so as to obtain a self-sealing effect of the active end of the ejector against the walls of the cavity of the matrix throughout the duration of the stamping process and d ejection of the rivet thus obtained.
  • the subject of the invention is also a tool for implementing the method defined above, comprising a matrix having an imprint, a punch and an ejector, characterized in that said imprint is a cylindrical bore of constant diameter over the entire extent which receives the blank and the ejector, said ejector having one end having a hollow shape limited by a solid of revolution whose shape is almost complementary to that of the end of the rivet to obtain, and this solid of revolution being of equal resistance to bending, is therefore deformable under the action of the pressure exerted by the end of the blank during the forging of said blank on the one hand, as well as during the ejection of the rivet thus obtained, to apply so as to obtain self-sealing against the walls of the cavity, said ejector having a diameter approximately equal to that of the bore, and being mounted to slide and adjustable in it.
  • the rivet R shown in FIG. 1 is conventional. It comprises a head 1 and a rod 2, the end 3 of which is called the front, in contrast to the head 1 has a frustoconical shape in order to favor the introduction into the holes of the riveting assemblies, in the processes automated industrial assemblies.
  • the blank of the rivet R undergoes a stamping operation in an impression 4 of a matrix 5, in which the rivet is stamped by means of a striking punch 6, with its end 3 resting in that of the impression 4 , which has a frustoconical shape complementary to that of the rivet to be obtained.
  • a bore 4a is formed in the matrix 5 and extends coaxially in the extension of the cavity 4, but has a smaller diameter than that of the latter, and an ejector 7 is slidably mounted in this bore.
  • the punch 6 is then moved away from the head 1 of the rivet, the ejector 7 is actuated in order to drive the rivet out of the matrix by exerting on its end an axial force sufficient to overcome the friction resistance due to the sum of the forces f.
  • a matrix 5 ′ is used whose imprint 4 ′ and the coaxial bore 4′a in which the ejector 7 ′ slides have a cylindrical shape having a constant common diameter.
  • the imprint 4 ′ does not have an end having a shoulder of frustoconical shape complementary to that of the front end 3 ′ of the rod of the rivet.
  • the end of the ejector 7 ′ in contact with that of the rivet has a hollow shape limited by a solid of revolution constituting a regular cavity 12 of shape almost complementary to that of the end 3 ′ of the rivet to be obtained, and this solid of revolution being of equal resistance to bending, is therefore deformable under the action of the pressure exerted by the end of the blank during the forging of said blank on the one hand, as well as during the ejection of the rivet thus obtained, to apply so as to obtain self-sealing against the walls of the cavity, the intersection of the cylindrical volume of the ejector 7 ′ with said hollow surface 12 forming a sharp edge 13 and circular contained in a plane perpendicular to the axis XX of the cavity 4 ′ in which the ejector 7 ′ slides, according to FIG. 6.
  • the ejector 7 ′ is slidably mounted in the cavity 4 ′, but is adapted to be adjusted at will in position in the cavity by known means which are not part of the invention.
  • the ejector 7 ′ should be maintained and guided over a minimum safety length G. It has been found that this length G must be approximately 3.5 times the diameter of the cavity 4 ′ (FIG. 6 ).
  • the material, at the frustoconical end 3 ′ of the rivet, is enclosed and compressed under the action of the punch 6 ′ in the cavity 12 of the ejector 7 ′ which forms a stop at a point of the impression 4 ′ chosen according to the desired length of the rivet.
  • the geometry of the hollow surface of the ejector is variable deformable under the force of the stamping pressure applied to the other end of the blank.
  • This surface of the 3 ′ end being subjected to pressure as a whole does not consequently present any localized partial deformation liable to disturb the internal structure, nor any parasitic relief as in the prior art.
  • the hollow surface of revolution 12 is a frustoconical surface with straight generator or concave curve and having a flat or curved or complex bottom.
  • the rivets obtained by the process and the tooling according to the invention have a constant shape and surface quality and are free from the defects of rivets of the prior art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)
  • Forging (AREA)

Abstract

In this method, in which a forging die (5') having an indentation (4'), a header die (6') and an ejector (7') are used, the end of the blank is arranged to bear against a hollow surface (12) of complementary shape formed at one end of an ejector-forming component (7') slidably and adjustably mounted in the said indentation (4'), a forging pressure is exerted on the opposite end of the rivet and the rivet is ejected by means of the said ejector (7'). <IMAGE>

Description

La présente invention concerne d'une façon géné­rale les assemblages mécaniques rivés et elle est plus par­ticulièrement relative à un procédé industriel nouveau de fabrication de rivets par matriçage.The present invention relates generally to riveted mechanical assemblies and it relates more particularly to a new industrial process for manufacturing rivets by stamping.

Le procédé actuel de fabrication de rivets par matriçage présente des inconvénients en ce qu'à la suite de cette opération, et du fait que le rivet est chassé de l'empreinte de la matrice par un éjecteur exerçant une pres­sion sur une partie de son extrémité, celle-ci est déformée, ce qui provoque l'apparition de perturbations susceptibles de donner naissance à des criques ou à des fissures lorsque cette extrémité est écrasée lors de l'opération de rivetage, ce qui diminue notablement les caractéristiques mécaniques et nuit beaucoup à la tenue à la corrosion de la rivure obtenue.The current method of manufacturing rivets by stamping has drawbacks in that following this operation, and the fact that the rivet is driven from the impression of the matrix by an ejector exerting pressure on a part of its end , the latter is deformed, which causes the appearance of disturbances liable to give rise to cracks or cracks when this end is crushed during the riveting operation, which significantly reduces the mechanical characteristics and is very harmful to the corrosion resistance of the rivet obtained.

Le but de l'invention est de remédier à ces in­convients en fournissant un procédé industriel et un outillage de fabrication de rivets par matriçage permettant d'éviter l'apparition de ces perturbations et des vices qui en résultent.The object of the invention is to remedy these drawbacks by providing an industrial process and a tool for manufacturing rivets by stamping, making it possible to avoid the appearance of these disturbances and of the vices which result therefrom.

L'invention a pour objet à cet effet un procédé industriel de fabrication de rivets par matriçage d'une ébauche cylindrique dans une empreinte d'une matrice, dans lequel on dispose une extrémité de ladite ébauche en appui contre une surface creuse de forme quasi complémentaire à celle du rivet à obtenir, ladite surface creuse étant for­mée à l'extrémité d'un organe cylindrique formant éjecteur, logé dans l'empreinte, et dont la géométrie de la surface creuse est variable sous l'effort de la pression de matri­çage appliquée à l'autre extrémité de l'ébauche, de manière à obtenir un effet d'auto-étanchéité de l'extrémité active de l'éjecteur contre les parois de l'empreinte de la matrice pendant toute la durée du processus de matriçage et d'éjec­tion du rivet ainsi obtenu.The subject of the invention is therefore an industrial process for manufacturing rivets by stamping a cylindrical blank in an impression of a matrix, in which one end of said blank is placed in abutment against a hollow surface of almost complementary shape to that of the rivet to be obtained, said hollow surface being formed at the end of a cylindrical member forming an ejector, housed in the cavity, and the geometry of the hollow surface of which is variable under the force of the applied stamping pressure at the other end of the blank, so as to obtain a self-sealing effect of the active end of the ejector against the walls of the cavity of the matrix throughout the duration of the stamping process and d ejection of the rivet thus obtained.

L'invention a également pour objet un outillage pour la mise en oeuvre du procédé défini ci-dessus, compre­nant une matrice ayant une empreinte, un poinçon et un éjecteur, caractérisé en ce que ladite empreinte est un alésage cylindrique de diamètre constant sur toute l'éten­due qui reçoit l'ébauche et l'éjecteur, ledit éjecteur ayant une extrémité présentant une forme creuse limitée par un solide de révolution dont la forme est quasi complémentaire de celle de l'extrémité du rivet à obtenir, et ce solide de révolution étant d'égale résistance à la flexion, est donc déformable sous l'action de la pression exercée par l'extré­mité de l'ébauche lors du matriçage de ladite ébauche d'une part, ainsi que lors de l'éjection du rivet ainsi obtenu, pour s'appliquer de façon à obtenir l'auto-étanchéité contre les parois de l'empreinte, ledit éjecteur ayant un diamètre à peu près égal à celui de l'alésage, et étant monté coulis­sant et réglable dans celui-ci.The subject of the invention is also a tool for implementing the method defined above, comprising a matrix having an imprint, a punch and an ejector, characterized in that said imprint is a cylindrical bore of constant diameter over the entire extent which receives the blank and the ejector, said ejector having one end having a hollow shape limited by a solid of revolution whose shape is almost complementary to that of the end of the rivet to obtain, and this solid of revolution being of equal resistance to bending, is therefore deformable under the action of the pressure exerted by the end of the blank during the forging of said blank on the one hand, as well as during the ejection of the rivet thus obtained, to apply so as to obtain self-sealing against the walls of the cavity, said ejector having a diameter approximately equal to that of the bore, and being mounted to slide and adjustable in it.

La description qui va suivre, en regard des des­sins annexés à titre d'exemples non limitatifs, permettra de bien comprendre comment l'invention peut être mise en pratique.

  • La figure 1 est une vue en élévation latérale d'un rivet.
  • Les figures 2 et 3 montrent les différentes phases de l'opération de matriçage de l'ébauche d'un rivet repré­sentée à la figure 1, suivant le procédé classique utilisé jusqu'à présent.
  • La figure 4 représente le rivet ainsi obtenu.
  • La figure 5 montre un ensemble riveté au moyen d'un rivet fabriqué suivant l'art antérieur illustré aux figures 2 à 4.
  • Les figures 6 à 8 montrent la mise en oeuvre du procédé de l'invention ainsi que la forme de la matrice et celle de l'éjecteur suivant l'invention.
The description which follows, with reference to the accompanying drawings by way of nonlimiting examples, will make it possible to understand clearly how the invention can be put into practice.
  • Figure 1 is a side elevational view of a rivet.
  • Figures 2 and 3 show the different phases of the die stamping operation of the roughing of a rivet shown in Figure 1, according to the conventional method used until now.
  • Figure 4 shows the rivet thus obtained.
  • FIG. 5 shows an assembly riveted by means of a rivet manufactured according to the prior art illustrated in FIGS. 2 to 4.
  • Figures 6 to 8 show the implementation of the method of the invention as well as the shape of the matrix and that of the ejector according to the invention.

Dans les différentes figures, les parties ou éléments analogues sont désignés par les mêmes références, suivies pour l'invention de l'indice " ' " pour la distinguer de l'art antérieur.In the various figures, the parts or similar elements are designated by the same references, followed for the invention by the index "'" to distinguish it from the prior art.

Le rivet R représenté à la figure 1 est classique. Il comporte une tête 1 et une tige 2 dont l'extrémité 3 dite avant, par opposition à la tête 1 présente une forme tronconique en vue de favoriser l'introduction dans les trous des ensembles à river, dans les processus d'assemblages industriels automatisés.The rivet R shown in FIG. 1 is conventional. It comprises a head 1 and a rod 2, the end 3 of which is called the front, in contrast to the head 1 has a frustoconical shape in order to favor the introduction into the holes of the riveting assemblies, in the processes automated industrial assemblies.

L'ébauche du rivet R subit une opération de ma­triçage dans une empreinte 4 d'une matrice 5, dans laquelle le rivet est matricé au moyen d'un poinçon de frappe 6, avec son extrémité 3 en appui dans celle de l'empreinte 4, qui présente une forme tronconique complémentaire de celle du rivet à obtenir.The blank of the rivet R undergoes a stamping operation in an impression 4 of a matrix 5, in which the rivet is stamped by means of a striking punch 6, with its end 3 resting in that of the impression 4 , which has a frustoconical shape complementary to that of the rivet to be obtained.

Un alésage 4a est ménagé dans la matrice 5 et s'étend coaxialement dans le prolongement de l'empreinte 4, mais présente un diamètre plus petit que celui de celle-­ci, et un éjecteur 7 est monté coulissant dans cet alésage.A bore 4a is formed in the matrix 5 and extends coaxially in the extension of the cavity 4, but has a smaller diameter than that of the latter, and an ejector 7 is slidably mounted in this bore.

Sous l'action du poinçon 6, la tige 2 du rivet se dilate et s'applique étroitement contre la paroi de l'empreinte, contre laquelle elle exerce une pression indiquée par les flèches f à la figure 3.Under the action of the punch 6, the rod 2 of the rivet expands and is applied closely against the wall of the impression, against which it exerts a pressure indicated by the arrows f in FIG. 3.

En même temps le matériau du rivet soumis à la pression du poinçon 6 flue autour de l'extrémité de l'éjec­teur 7, dans l'interstice 8 entre celui-ci et l'alésage 4a dans lequel il coulisse, qui constitue son jeu normal de fonctionnement, en formant une couronne annulaire en saillie 9.At the same time the material of the rivet subjected to the pressure of the punch 6 flows around the end of the ejector 7, in the gap 8 between the latter and the bore 4a in which it slides, which constitutes its normal play. operating, by forming a projecting annular crown 9.

Le poinçon de frappe 6 étant alors écarté de la tête 1 du rivet, l'éjecteur 7 est actionné afin de chasser le rivet de la matrice en exerçant sur son extrémité une force axiale suffisante pour surmonter la résistance de frottement due à la somme des forces f.The punch 6 is then moved away from the head 1 of the rivet, the ejector 7 is actuated in order to drive the rivet out of the matrix by exerting on its end an axial force sufficient to overcome the friction resistance due to the sum of the forces f.

La pression nécessaire, appliquée par une surface aussi réduite que celle de l'éjecteur 7,conduit inévitable­ment à un enfoncement du matériau du rivet au centre de la couronne 9 (figure 4).The necessary pressure, applied by an area as small as that of the ejector 7, inevitably leads to a depression of the material of the rivet in the center of the crown 9 (FIG. 4).

Les forces élevées auxquelles est ainsi soumis le matériau à l'extrémité 3 du rivet engendrent des pertur­bations de sa structure interne. En effet, lorsque le rivet est posé sur un ensemble à river 10, la couronne 9 qui appartient à la zone perturbée est écrasée et repliée vers l'intérieur, comme représenté en 11 (figure 5) ce qui peut provoquer la formation de micro-criques dans cette zone. Ces micro-criques sont nuisibles à la tenue mécanique de l'assemblage réalisé et, avec le repli, constituent des réceptacles pour des éléments corrosifs.The high forces to which the material is thus subjected at the end 3 of the rivet generate disturbances of its internal structure. Indeed, when the rivet is placed on a riveting assembly 10, the crown 9 which belongs to the disturbed zone is crushed and folded inwards, as shown in 11 (FIG. 5) which can cause the formation of micro- coves in this area. These micro-cracks are detrimental to the mechanical strength of the assembly produced and, with the fold, constitute receptacles for corrosive elements.

En outre, avec ce procédé et cet outillage clas­siques, des matrices de longueurs différentes sont néces­saires pour obtenir une gamme de rivets de longueurs de tiges différentes.In addition, with this conventional method and tool, dies of different lengths are required to obtain a range of rivets of different rod lengths.

Suivant l'invention, on utilise une matrice 5′ dont l'empreinte 4′ et l'alésage 4′a coaxial dans lequel coulisse l'éjecteur 7′ ont une forme cylindrique ayant un diamètre commun constant. En d'autres termes l'empreinte 4′ ne comporte pas d'extrémité ayant un épaulement de forme tronconique complémentaire de celle de l'extrémité avant 3′ de la tige du rivet.According to the invention, a matrix 5 ′ is used whose imprint 4 ′ and the coaxial bore 4′a in which the ejector 7 ′ slides have a cylindrical shape having a constant common diameter. In other words, the imprint 4 ′ does not have an end having a shoulder of frustoconical shape complementary to that of the front end 3 ′ of the rod of the rivet.

De plus, l'extrémité de l'éjecteur 7′ en contact avec celle du rivet présente une forme creuse limitée par un solide de révolution constituant une cavité régulière 12 de forme quasi complémentaire de celle de l'extrémité 3′ du rivet à obtenir, et ce solide de révolution étant d'égale résistance à la flexion, est donc déformable sous l'ac­tion de la pression exercée par l'extrémité de l'ébauche lors du matriçage de ladite ébauche d'une part, ainsi que lors de l'éjection du rivet ainsi obtenu, pour s'appliquer de façon à obtenir l'auto-étanchéité contre les parois de l'empreinte, l'intersection du volume cylindrique de l'éjec­teur 7′ avec ladite surface creuse 12 formant une arête 13 vive et circulaire contenue dans un plan perpendiculaire à l'axe X-X de l'empreinte 4′ dans laquelle coulisse l'éjec­teur 7′, suivant la figure 6.In addition, the end of the ejector 7 ′ in contact with that of the rivet has a hollow shape limited by a solid of revolution constituting a regular cavity 12 of shape almost complementary to that of the end 3 ′ of the rivet to be obtained, and this solid of revolution being of equal resistance to bending, is therefore deformable under the action of the pressure exerted by the end of the blank during the forging of said blank on the one hand, as well as during the ejection of the rivet thus obtained, to apply so as to obtain self-sealing against the walls of the cavity, the intersection of the cylindrical volume of the ejector 7 ′ with said hollow surface 12 forming a sharp edge 13 and circular contained in a plane perpendicular to the axis XX of the cavity 4 ′ in which the ejector 7 ′ slides, according to FIG. 6.

L'éjecteur 7′, est monté coulissant dans l'em­preinte 4′, mais est adapté pour être réglé à volonté en position dans l'empreinte par des moyens connus ne faisant pas partie de l'invention.The ejector 7 ′ is slidably mounted in the cavity 4 ′, but is adapted to be adjusted at will in position in the cavity by known means which are not part of the invention.

Grâce à cet agencement, il suffit de régler la position axiale de l'éjecteur 7′, dans son alésage pour pouvoir matricer des ébauches de rivets en appui sur l'ex­trémité de l'éjecteur, ces rivets pouvant avoir une longueur de tige quelconque désirée L au moyen d'un seul et même outil. On comprend que non seulement il suffit d'un seul outil remplaçant toute la gamme des outils utilisés jusqu'à présent, mais en outre qu'il est possible de réaliser des rivets ayant toutes les longueurs différentes de tiges désirées.Thanks to this arrangement, it suffices to adjust the axial position of the ejector 7 ′, in its bore, in order to be able to stamp blank rivets bearing on the end of the ejector, these rivets being able to have any desired length of rod. L using a single tool. It is understood that not only is a single tool sufficient to replace the whole range of tools used until now, but also that it is possible to carry out rivets with all the different lengths of rods desired.

Dans la pratique il convient de maintenir et de guider l'éjecteur 7′ sur une longueur minimale de sécurité G. On a trouvé que cette longueur G doit être d'environ 3,5 fois le diamètre de l'empreinte 4′ (figure 6).In practice, the ejector 7 ′ should be maintained and guided over a minimum safety length G. It has been found that this length G must be approximately 3.5 times the diameter of the cavity 4 ′ (FIG. 6 ).

Lors de l'opération de matriçage, le matériau, à l'extrémité tronconique 3′ du rivet, se trouve enfermé et comprimé sous l'action du poinçon 6′ dans la cavité 12 de l'éjecteur 7′ qui forme butée en un point de l'empreinte 4′ choisi en fonction de la longueur désirée du rivet.During the stamping operation, the material, at the frustoconical end 3 ′ of the rivet, is enclosed and compressed under the action of the punch 6 ′ in the cavity 12 of the ejector 7 ′ which forms a stop at a point of the impression 4 ′ chosen according to the desired length of the rivet.

Sous la pression appliquée par le poinçon 6′ ce matériau est soumis à des forces f qui le font plaquer contre les parois de l'empreinte 4′ ainsi que contre les parois de la cavité 12 de l'éjecteur 7′ avec les forces f.Under the pressure applied by the punch 6 ′ this material is subjected to forces f which cause it to press against the walls of the cavity 4 ′ as well as against the walls of the cavity 12 of the ejector 7 ′ with the forces f.

Ainsi, la géométrie de la surface creuse de l'éjecteur est déformable de façon variable sous l'effort de la pression de matriçage appliquée à l'autre extrémité de l'ébauche.Thus, the geometry of the hollow surface of the ejector is variable deformable under the force of the stamping pressure applied to the other end of the blank.

Ceci est obtenu grâce à la forme de l'extrémité de l'éjecteur qui délimite la cavité 12 qui est un solide de révolution ''d'égale résistance à la flexion'' et, sous la pression croissante de matriçage, il s'établit, par une flexion harmonieuse de ce solide, une auto-étanchéité de celui-ci, contre la paroi de l'empreinte 4′, d'abord par son arête circulaire 13 et ensuite par une flexion plus soutenue des sections s1, s2, s3......sn du solide de révolution situées immédiatement au-dessous de l'arête 13 (figure 8) qui forme un ''coin" d'étanchéité entre l'extrémi­té 3′ et la paroi de l'empreinte, dont l'action d'auto­étanchéité augmente avec la pression; cette flexion étant autorisée par le jeu normal de l'éjecteur dans l'empreinte 4′.This is obtained thanks to the shape of the end of the ejector which delimits the cavity 12 which is a solid of revolution "of equal resistance to bending" and, under increasing pressure of stamping, it is established , by a harmonious bending of this solid, a self-sealing of it, against the wall of the cavity 4 ′, first by its circular edge 13 and then by a more sustained bending of the sections s1, s2, s3 ...... sn of the solid of revolution located immediately below the edge 13 (figure 8) which forms a "wedge" of sealing between the end 3 ′ and the wall of the cavity, the self-sealing action increases with pressure; this bending being authorized by the normal clearance of the ejector in the cavity 4 ′.

Lors de l'éjection du rivet sous la pression de l'éjecteur 7′ cet effet "d'auto-étanchéité" est le même, et la totalité de la surface de la cavité 12 est appliquée sur la surface correspondante de l'extrémité 3′ du rivet, dont la matière ne peut pas fluer autour de l'éjecteur 7′.During the ejection of the rivet under the pressure of the ejector 7 ′ this "self-sealing" effect is the same, and the entire surface of the cavity 12 is applied to the corresponding surface of the end 3 ′ Of the rivet, the material of which cannot flow around the ejector 7 ′.

Cette surface de l'extrémité 3′ étant soumise en totalité à la pression ne présente par suite aucune défor­mation partielle localisée susceptible d'en perturber la structure interne, ni aucun relief parasite comme dans l'art antérieur.This surface of the 3 ′ end being subjected to pressure as a whole does not consequently present any localized partial deformation liable to disturb the internal structure, nor any parasitic relief as in the prior art.

La surface creuse de révolution 12 est une surface tronconique à génératrice droite ou courbe concave et présentant un fond plat ou courbe ou complexe.The hollow surface of revolution 12 is a frustoconical surface with straight generator or concave curve and having a flat or curved or complex bottom.

Les rivets obtenus grâce au procédé et à l'outil­lage suivant l'invention, ont une forme et une qualité de surface constantes et sont exempts des défauts des rivets de l'art antérieur.The rivets obtained by the process and the tooling according to the invention have a constant shape and surface quality and are free from the defects of rivets of the prior art.

Claims (6)

1. Procédé industriel de fabrication de rivets par matriçage d'une ébauche cylindrique dans une empreinte d'une matrice, dans lequel on dispose une extrémité de ladite ébauche en appui contre une surface creuse de forme quasi complémentaire à celle du rivet à obtenir, ladite surface creuse étant formée à l'extrémité d'un organe cylindrique formant éjecteur, logé dans l'empreinte, et dont la géométrie de la surface creuse est variable sous l'effort de la pression de matriçage appliquée à l'autre extrémité de l'ébauche, de manière à obtenir un effet d'auto-étanchéité de l'extrémité active de l'éjecteur contre les parois de l'empreinte de la matrice pendant toute la durée du processus de matriçage et d'éjection du rivet ainsi obtenu.1. Industrial process for manufacturing rivets by stamping a cylindrical blank in an imprint of a matrix, in which one end of said blank is placed in abutment against a hollow surface of shape almost complementary to that of the rivet to be obtained, said hollow surface being formed at the end of a cylindrical member forming an ejector, housed in the cavity, and whose geometry of the hollow surface is variable under the force of the stamping pressure applied to the other end of the blank, so as to obtain a self-sealing effect of the active end of the ejector against the walls of the imprint of the matrix throughout the duration of the forging and ejection process of the rivet thus obtained. 2. Outillage pour la mise en oeuvre du procédé défini suivant la revendication 1, comprenant une matrice (5′) ayant une empreinte (4′), un poinçon (6′) et un éjecteur (7′), caractérisé en ce que ladite empreinte (4′, 4′a) est un alésage cylindrique de diamètre constant sur toute l'étendue qui reçoit l'ébauche et l'éjecteur (7′), ledit éjecteur ayant une extrémité présentant une forme creuse limitée par un solide de révolution dont la forme est quasi complémentaire de celle de l'extrémité (3′) du rivet à obtenir, et ce solide de révolution étant "d'égale résistance à la flexion", est donc déformable sous l'action de la pression exercée par l'extrémité de l'ébauche lors du matriçage de ladite ébauche d'une part, ainsi que lors de l'éjection du rivet ainsi obtenu, pour s'appliquer de façon à obtenir l'auto-étanchéité contre les parois de l'empreinte (4′, 4′a), ledit éjecteur (7′) ayant un diamètre à peu près égal à celui de l'alésage, et étant monté cou­lissant et réglable dans celui-ci.2. Tools for implementing the method defined according to claim 1, comprising a matrix (5 ′) having an imprint (4 ′), a punch (6 ′) and an ejector (7 ′), characterized in that said cavity (4 ′, 4′a) is a cylindrical bore of constant diameter over the entire extent which receives the blank and the ejector (7 ′), said ejector having one end having a hollow shape limited by a solid of revolution whose shape is almost complementary to that of the end (3 ′) of the rivet to be obtained, and this solid of revolution being "of equal resistance to bending", is therefore deformable under the action of the pressure exerted by l end of the blank when stamping said blank on the one hand, as well as during the ejection of the rivet thus obtained, to apply so as to obtain self-sealing against the walls of the cavity ( 4 ′, 4′a), said ejector (7 ′) having a diameter approximately equal to that of the bore, and being slidably and adjustable mounted therein. 3. Outillage suivant la revendication 2, caracté­risé en ce que ladite surface creuse (12) de l'éjecteur (7′) est de révolution, tronconique, à génératrice droite, courbe ou complexe, le fond de ladite surface étant plat ou courbe concave.3. Tool according to claim 2, characterized in that said hollow surface (12) of the ejector (7 ′) is of revolution, frustoconical, with straight generator, curved or complex, the bottom of said surface being flat or concave curve . 4. Outillage suivant la revendication 3, caracté­risé en ce que l'intersection du volume cylindrique de l'éjecteur (7′) avec ladite surface creuse (12) forme une arête (13) vive et circulaire, contenue dans un plan per­pendiculaire à l'axe X-X de l'empreinte (4′).4. Tool according to claim 3, characterized in that the intersection of the cylindrical volume of the ejector (7 ′) with said hollow surface (12) forms a sharp and circular edge (13), contained in a plane perpendicular to l 'axis XX of the imprint (4 ′). 5. Outillage suivant la revendication 4, caracté­risé en ce que la longueur minimale de l'éjecteur (7′) engagée dans ledit alésage au moment du matriçage est d'en­viron 3,5 fois le diamètre dudit alésage.5. Tool according to claim 4, characterized in that the minimum length of the ejector (7 ′) engaged in said bore at the time of stamping is about 3.5 times the diameter of said bore. 6. Rivet matricé obtenu au moyen du procédé et de l'outillage tels que définis suivant l'une quelconque des revendications 1 à 5.6. stamped rivet obtained by means of the method and the tooling as defined according to any one of claims 1 to 5.
EP19890400023 1988-01-08 1989-01-04 Method and tooling equipment for making forged rivets Expired - Lifetime EP0323931B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8800129A FR2625697B1 (en) 1988-01-08 1988-01-08 METHOD AND TOOL FOR MANUFACTURING MATRIX RIVETS AND RIVET OBTAINED
FR8800129 1988-01-08

Publications (2)

Publication Number Publication Date
EP0323931A1 true EP0323931A1 (en) 1989-07-12
EP0323931B1 EP0323931B1 (en) 1992-06-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890400023 Expired - Lifetime EP0323931B1 (en) 1988-01-08 1989-01-04 Method and tooling equipment for making forged rivets

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EP (1) EP0323931B1 (en)
AU (1) AU611748B2 (en)
DE (1) DE68901647T2 (en)
ES (1) ES2033100T3 (en)
FR (1) FR2625697B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100429670B1 (en) * 2001-12-28 2004-05-03 강윤규 A manufacturing process of yoke
JP2014237139A (en) * 2013-06-06 2014-12-18 昭和電工株式会社 Forging metal mold
JP2014237140A (en) * 2013-06-06 2014-12-18 昭和電工株式会社 Forging metal mold
CN110479920A (en) * 2019-09-10 2019-11-22 深圳市正和首信精密科技有限公司 A kind of riveting method of USB product

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK27592A (en) * 1992-03-03 1993-09-04 Enkotec As METHOD AND APPARATUS FOR PREPARING AN OBJECTED TOPIC

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426422A (en) * 1945-02-15 1947-08-26 Carel T Torresen Method of making expandable rivets
GB807155A (en) * 1954-09-25 1959-01-07 Tucker Eyelet Co George Improvements in or relating to eyelets
US3978538A (en) * 1974-11-01 1976-09-07 The National Machinery Company Method for making shouldered tubular rivets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426422A (en) * 1945-02-15 1947-08-26 Carel T Torresen Method of making expandable rivets
GB807155A (en) * 1954-09-25 1959-01-07 Tucker Eyelet Co George Improvements in or relating to eyelets
US3978538A (en) * 1974-11-01 1976-09-07 The National Machinery Company Method for making shouldered tubular rivets

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100429670B1 (en) * 2001-12-28 2004-05-03 강윤규 A manufacturing process of yoke
JP2014237139A (en) * 2013-06-06 2014-12-18 昭和電工株式会社 Forging metal mold
JP2014237140A (en) * 2013-06-06 2014-12-18 昭和電工株式会社 Forging metal mold
CN110479920A (en) * 2019-09-10 2019-11-22 深圳市正和首信精密科技有限公司 A kind of riveting method of USB product
CN110479920B (en) * 2019-09-10 2024-05-28 广东正和智造科技股份有限公司 Pressing riveting method for USB product

Also Published As

Publication number Publication date
EP0323931B1 (en) 1992-06-03
DE68901647T2 (en) 1992-12-24
FR2625697A1 (en) 1989-07-13
AU2778189A (en) 1989-07-20
AU611748B2 (en) 1991-06-20
FR2625697B1 (en) 1993-07-23
ES2033100T3 (en) 1993-03-01
DE68901647D1 (en) 1992-07-09

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