EP0323931B1 - Verfahren und Werkzeugausrüstung zur Herstellung geschmiedeter Niete - Google Patents

Verfahren und Werkzeugausrüstung zur Herstellung geschmiedeter Niete Download PDF

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Publication number
EP0323931B1
EP0323931B1 EP19890400023 EP89400023A EP0323931B1 EP 0323931 B1 EP0323931 B1 EP 0323931B1 EP 19890400023 EP19890400023 EP 19890400023 EP 89400023 A EP89400023 A EP 89400023A EP 0323931 B1 EP0323931 B1 EP 0323931B1
Authority
EP
European Patent Office
Prior art keywords
ejector
blank
rivet
cavity
forging
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
EP19890400023
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English (en)
French (fr)
Other versions
EP0323931A1 (de
Inventor
Bernard Albert Marie Colin
Michel Antoine Claudius Cortey
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.)
Airbus Group SAS
Original Assignee
Airbus Group SAS
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Filing date
Publication date
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Application filed by Airbus Group SAS filed Critical Airbus Group SAS
Publication of EP0323931A1 publication Critical patent/EP0323931A1/de
Application granted granted Critical
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Classifications

    • 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.
  • 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 pressure of stamping 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 matrix cavity for the duration of the stamping process and ejecting 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 blank of the rivet, this solid of revolution being of equal resistance to bending, and deformable under the action of the pressure exerted by the end of the blank of the rivet 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 sliding and adjustable in it.
  • 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.
  • FIG. 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.
  • 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, as opposed 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 blank of the rivet, 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 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 an edge 13 lively 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)

Claims (5)

1. Industrielles Verfahren zur Herstellung von Nieten durch Gesenkverformung eines zylinderförmigen Rohlings (2′) in einer Abdruckform (4′) einer Matrize (5′), bei welchem das eine Ende (3′) des Rohlings (2′) an eine mit einer Ausnehmung versehene Oberfläche (12) zur Anlage gebracht wird, deren Gestalt im wesentlichen komplementär zu der des Nietrohlings ist, wobei die mit der Ausnehmung (12) versehene Oberfläche am Ende eines einen Auswerfer (7′) bildenden zylindrischen Teils angeformt ist, der in der Abdruckform (4′) angebracht ist, und wobei die Geometrie der mit der Ausnehmung (12) versehenen Oberfläche unter der vom anderen Ende des Rohlings her eingeleiteten Druckbeanspruchung bei der Gesenkverformung derart veränderbar ist, daß ein Selbstabdichtungseffekt zwischen dem aktiven Ende (S1 - Sn) des Auswerfers und der Seitenwand der Abdruckform der Matrize (5′) während der gesamten Dauer der Gesenkverformung und des Auswurfs des auf diese Art und Weise erhaltenen Niets erreicht wird.
2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, bestehend aus einer Matrize (5′) mit einer Abdruckform (4′), einem Stempel (6′) und einem Auswerfer (7′), dadurch gekennzeichnet, daß die Abdruckform (4′, 4′a) eine zylindrische Bohrung ist, deren Durchmesser über ihre gesamte Länge konstant ist, und die den Rohling und den Auswerfer (7′) aufnimmt, wobei der Auswerfer ein Endstück mit einer Ausnehmung (12) aufweist, die durch einen Rotationskörper begrenzt ist, dessen Form im wesentlichen komplementär zu derjenigen des Nietrohlings (3′) ist, wobei der Rotationskörper von "gleicher Biegefestigkeit" ist und unter Einwirkung der auf das Ende des Nietrohlings bei der Gesenkverformung ausgeübten Kraft ebenso wie beim Auswurf des so erhaltenen Niets verformbar ist, um sich an die Seitenwände der Abdruckform (4′, 4′a) derart anzulegen, daß eine Selbstabdichtung erreicht wird, wobei der Auswerfer (7′) einen Durchmesser aufweist, der beinahe gleich der Bohrung ist und in dieser verstell- und einstellbar geführt ist.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Ausnehmung (12) in der Oberfläche des Auswerfers (7′) drehsymmetrisch, kegelstumpfförmig, mit gerader, gebogener oder komplexer Mantellinie ausgebildet ist und der Boden dieser Oberfläche flach oder konkav geformt ist.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Schnittlinie des zylinderförmigen Volumens des Auswerfers (7′) mit der Ausnehmung (12) in der Oberfläche einen scharfen, kreisförmigen Grat (13) bildet, der in einer Ebene senkrecht zur X-X-Achse der Abdruckform (4′) liegt.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Auswerfer (7′) zum Zeitpunkt der Gesenkverformung mit einer Länge in die Zylinderbohrung hinein vorsteht, die wenigstens ungefähr das 3,5fache des Durchmessers dieser Zylinderbohrung beträgt.
EP19890400023 1988-01-08 1989-01-04 Verfahren und Werkzeugausrüstung zur Herstellung geschmiedeter Niete Expired - Lifetime EP0323931B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8800129A FR2625697B1 (fr) 1988-01-08 1988-01-08 Procede et outillage de fabrication de rivets matrices et rivet obtenu
FR8800129 1988-01-08

Publications (2)

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

Family

ID=9362124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890400023 Expired - Lifetime EP0323931B1 (de) 1988-01-08 1989-01-04 Verfahren und Werkzeugausrüstung zur Herstellung geschmiedeter Niete

Country Status (5)

Country Link
EP (1) EP0323931B1 (de)
AU (1) AU611748B2 (de)
DE (1) DE68901647T2 (de)
ES (1) ES2033100T3 (de)
FR (1) FR2625697B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK27592A (da) * 1992-03-03 1993-09-04 Enkotec As Fremgangsmaade og apparat til fremstilling af et aflangt emne
KR100429670B1 (ko) * 2001-12-28 2004-05-03 강윤규 리벳용 요크의 제조 방법
JP2014237139A (ja) * 2013-06-06 2014-12-18 昭和電工株式会社 鍛造金型
JP2014237140A (ja) * 2013-06-06 2014-12-18 昭和電工株式会社 鍛造金型
CN110479920B (zh) * 2019-09-10 2024-05-28 广东正和智造科技股份有限公司 一种usb产品的压铆方法

Family Cites Families (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

Also Published As

Publication number Publication date
AU611748B2 (en) 1991-06-20
ES2033100T3 (es) 1993-03-01
DE68901647D1 (de) 1992-07-09
DE68901647T2 (de) 1992-12-24
FR2625697B1 (fr) 1993-07-23
FR2625697A1 (fr) 1989-07-13
AU2778189A (en) 1989-07-20
EP0323931A1 (de) 1989-07-12

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