EP0323931A1 - Verfahren und Werkzeugausrüstung zur Herstellung geschmiedeter Niete - Google Patents

Verfahren und Werkzeugausrüstung zur Herstellung geschmiedeter Niete Download PDF

Info

Publication number: EP0323931A1
Authority: EP; European Patent Office
Prior art keywords: ejector; rivet; blank; stamping; cavity
Prior art date: 1988-01-08
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.): Granted

Application number

EP89400023A

Other languages

English (en)

French (fr)

Other versions

EP0323931B1 (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

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.)

1988-01-08

Filing date

1989-01-04

Publication date

1989-07-12

Family has litigation

First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9362124&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0323931(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

1989-01-04 Application filed by Airbus Group SAS filed Critical Airbus Group SAS

1989-07-12 Publication of EP0323931A1 publication Critical patent/EP0323931A1/de

1992-06-03 Application granted granted Critical

1992-06-03 Publication of EP0323931B1 publication Critical patent/EP0323931B1/de

2009-01-04 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims abstract description 10
230000000295 complement effect Effects 0.000 claims abstract description 8
238000005242 forging Methods 0.000 claims abstract description 5
239000011159 matrix material Substances 0.000 claims description 12
238000004519 manufacturing process Methods 0.000 claims description 9
238000007789 sealing Methods 0.000 claims description 9
239000007787 solid Substances 0.000 claims description 9
238000005452 bending Methods 0.000 claims description 7
230000000694 effects Effects 0.000 claims description 3
238000007373 indentation Methods 0.000 abstract 2
239000000463 material Substances 0.000 description 6
230000000712 assembly Effects 0.000 description 3
238000000429 assembly Methods 0.000 description 3
238000007796 conventional method Methods 0.000 description 2
230000015572 biosynthetic process Effects 0.000 description 1
230000007797 corrosion Effects 0.000 description 1
238000005260 corrosion Methods 0.000 description 1
230000007547 defect Effects 0.000 description 1
230000001627 detrimental effect Effects 0.000 description 1
230000003071 parasitic effect Effects 0.000 description 1
230000000284 resting effect Effects 0.000 description 1
230000002459 sustained effect Effects 0.000 description 1

Images

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 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.

Landscapes

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

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
FR8800129		1988-01-08
FR8800129A FR2625697B1 (fr)	1988-01-08	1988-01-08	Procede et outillage de fabrication de rivets matrices et rivet obtenu

Publications (2)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
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
CN110479920A (zh) *	2019-09-10	2019-11-22	深圳市正和首信精密科技有限公司	一种usb产品的压铆方法

Families Citing this family (1)

* 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

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

1988
- 1988-01-08 FR FR8800129A patent/FR2625697B1/fr not_active Expired - Lifetime
1989
- 1989-01-04 EP EP19890400023 patent/EP0323931B1/de not_active Expired - Lifetime
- 1989-01-04 DE DE1989601647 patent/DE68901647T2/de not_active Expired - Lifetime
- 1989-01-04 ES ES89400023T patent/ES2033100T3/es not_active Expired - Lifetime
- 1989-01-06 AU AU27781/89A patent/AU611748B2/en not_active Ceased

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 (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
CN110479920A (zh) *	2019-09-10	2019-11-22	深圳市正和首信精密科技有限公司	一种usb产品的压铆方法
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

Also Published As

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

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1989-05-27	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
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