EP0062243A1 - Méthode de fabrication de rivets de contact bimétalliques - Google Patents

Méthode de fabrication de rivets de contact bimétalliques Download PDF

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Publication number
EP0062243A1
EP0062243A1 EP82102480A EP82102480A EP0062243A1 EP 0062243 A1 EP0062243 A1 EP 0062243A1 EP 82102480 A EP82102480 A EP 82102480A EP 82102480 A EP82102480 A EP 82102480A EP 0062243 A1 EP0062243 A1 EP 0062243A1
Authority
EP
European Patent Office
Prior art keywords
needle
abutment
upsetting
wire
wire sections
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.)
Granted
Application number
EP82102480A
Other languages
German (de)
English (en)
Other versions
EP0062243B2 (fr
EP0062243B1 (fr
Inventor
Erwin Bollian
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.)
Doduco Solutions GmbH
Original Assignee
Doduco GmbH and Co KG Dr Eugen Duerrwaechter
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6128658&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0062243(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Doduco GmbH and Co KG Dr Eugen Duerrwaechter filed Critical Doduco GmbH and Co KG Dr Eugen Duerrwaechter
Publication of EP0062243A1 publication Critical patent/EP0062243A1/fr
Application granted granted Critical
Publication of EP0062243B1 publication Critical patent/EP0062243B1/fr
Publication of EP0062243B2 publication Critical patent/EP0062243B2/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/041—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion
    • H01H11/042—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion by mechanical deformation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/49218—Contact or terminal manufacturing by assembling plural parts with deforming

Definitions

  • the starting point of the invention is a method for producing bimetallic contact rivets by cold welding with the features specified in the preamble of claim 1.
  • a method is known for example from CH-PS 386 212. (Compare there in particular the two exemplary embodiments according to FIGS. 8-14 and according to FIGS. 15-21).
  • two wire sections of different lengths and of different compositions with matching cross sections are separated from a wire supply, arranged one behind the other in a guide bushing and cold welded to one another at the adjoining cutting surfaces by pressure and enlargement of the contact surface.
  • the enlargement of the contact surface is also used to form the rivet head, be it that the abutment against which the wire sections are pushed out of the guide bush by a compression needle already has the contour of the rivet head, i.e. also serves as a headmaker, so that the wire section is compressed .
  • the rivet head is simultaneously formed between the upsetting needle and the abutment, be it that cold welding initially creates only a semi-finished blank, the head of which is only given its final shape in a second deformation step by a separate headmaker.
  • the longer wire section is made of copper and the shorter wire section is made of silver.
  • the copper is used to form the rivet shaft and to form the rear part of the rivet head, while the expensive silver is only used to form the actual contact layer.
  • bimetallic rivets with copper shafts and with silver contact surfaces have resulted in considerable silver savings.
  • the increasing cost of precious metals has led to efforts to further reduce the use of precious metals in bimetal contact rivets.
  • bimetal contact rivets are relatively expensive to produce on the one hand, and on the other hand they only seem to bring about a saving in noble metals, because a contact surface requires a certain minimum size for a given purpose; replacing the precious metal in the edge area with base metal would adversely affect the switching behavior.
  • the invention is based on the object of making available a process which is suitable for mass production and which makes it possible to produce bimetallic contact rivets made from wire by cold welding with a thinner noble metal coating than hitherto.
  • An essential feature of the invention is that an iw cylindrical blank with an enlarged diameter is first produced from the two wire sections by cold welding and that the rivet head is then formed at one end of this blank, where the precious metal is located.
  • the invention starts from thinner and correspondingly longer wire sections than the methods belonging to the prior art because of the formation of the blank with an enlarged diameter; in the prior art, the wires from which it is assumed already have the diameter that the shaft of the finished contact rivet should also have. Because the invention of thinner wires, the volume fraction of the precious metal used per contact rivet can be reduced.
  • the length of the wire section containing the noble metal can be chosen to be thinner than before, then the reduction in cross-section results in the precious metal being saved.
  • the required larger shank diameter of the bimetallic contact rivet is obtained by compressing the wire sections, which also weld them cold together.
  • the length of the wire sections is shortened to the same extent as the cross section of the wires increases.
  • the length of the noble metal section of the blank formed by upsetting and consequently the thickness of the noble metal layer on the finished molded contact rivet head can therefore be smaller than would be possible if one started with wire sections to produce a bimetallic contact rivet with the same external dimensions that were already in diameter with the Diameter of the shaft of the bimetal contact rivet match.
  • the increase in diameter that occurs during upsetting should be selected so that a flawless cold welding is guaranteed.
  • v w / v s ⁇ 0.25 means that there is only a progressively inadequate welding in the outer area of the abutting surface of the wire sections, while at a value of v w / v s above 0.5 the cross-sectional increase becomes too small for a perfect cold welding.
  • the abutment lies against the end of the guide bush.
  • the upsetting needle is then advanced into the guide bush at the speed v s and the abutment is moved back from the bush at the lower speed v synchronously.
  • a compression cannot take place in the interior of the guide bush, since the wall of the guide bush prevents the cross-section of the wire sections from increasing. Rather, the compression takes place in the space between the end of the guide bush and the abutment, which faces this ground.
  • the diameter increases continuously along the wire sections while the wire sections are being pushed out of the guide bush.
  • the cross-section increases according to the relationship where F 1 is the cross-sectional area of the wire sections before upsetting and F 2 is those after upsetting.
  • the upset section of the wires generally does not require any lateral guidance.
  • a further guide bushing is preferably used for this purpose, the clear cross section of which is just F2 or slightly larger.
  • the abutment is then displaceably mounted in this second guide bush.
  • the second guide bushing can also advantageously be used to hold the blank while it is being transferred to a headmaking tool and possibly also during the head molding process itself.
  • the rivet head can be formed on the blank in a known manner by one or two deformation shocks.
  • the end of the blank in a bushing covered with precious metal is first pre-compressed so far in the free space in front of the bushing that it can no longer buckle during the subsequent second deformation shock.
  • the second deformation blow is carried out with a press ram (headmaker), which has a recess whose contour matches the contour of the contact rivet head. If only one deformation blow is carried out, it is carried out with the headmaker and pre-upsetting is not necessary.
  • a bimetal contact rivet with generally identical external dimensions can be produced from a copper wire section of 30 mm length and 1.64 mm diameter and from a silver wire section of 1.5 mm length and 1.64 mm diameter. By compression, it becomes a blank of 3 mm in diameter and 9.45 mm in length, of which 0.45 mm is silver. After forming the head of 6 mm diameter with a remaining shaft length of 3 mm there is a silver coating on the head with an average thickness of only approx. 0.11 mm, ie the amount of silver used is only around 20% compared to the previously described bimetal contact rivet according to the prior art. Thanks to the silver savings, the height of the rivet head has been reduced by 0.39 mm while the copper insert has remained the same. If necessary, this can be compensated for by using more copper.
  • FIG. 1 to 9 schematically show an example of the sequence of the method according to the invention, showing the important device elements that are required to carry out the method.
  • a carrier 1 there are two cutting bushes 2 and 3 parallel to each other with the same internal width, to which a copper wire 5 and a silver wire 6 are fed from a wire supply in the direction of arrow 4 by a loading device (not shown).
  • the two wires have matching diameters (Fig. 1).
  • the free ends of the two cutting bushings 2 and 3 lie in alignment with a flat surface 10 of the carrier 1, on which a slide 7 can be moved.
  • the slide 7 has, parallel to the cutting bushes 2 and 3, a continuous guide bushing 8 with the same inner diameter as that of the cutting bushings 2 and 3.
  • a compression needle 9 is arranged displaceably in the guide bushing 8.
  • the manufacturing process begins with the slide 7 being moved so that the guide bush 8 is aligned with the cutting bush 3 (FIG. 1); the upsetting needle 9 is positioned so that its front end 9a is at a distance from the surface 10 which corresponds to the length of the silver wire section 6a to be cut off.
  • the silver wire 6 is advanced until it abuts the end 9a of the upsetting needle, and then the slider 7 is moved in the direction of the arrow 11 (FIG. 1), as a result of which the silver wire section 6a inserted in the guide bushing 8 is sheared off.
  • the slide 7 is now moved until the guide bush 8 is aligned with the cutting bush 2; at the same time the upsetting needle 9 is withdrawn by a distance which corresponds to the length of the copper wire section 5a to be cut off (FIG. 2).
  • the copper wire 5 is advanced in the direction of arrow 4 until it abuts the silver wire section 6a.
  • the slide 7 is then moved in the direction of the arrow 12 (FIG. 2), as a result of which the copper wire section 5a is sheared off.
  • the slide 7 is now shifted until the guide bush 8 is aligned with a second guide bush 13, which is arranged continuously in a second slide 1.4, which is parallel to the first slide 7 between the first slide 7 and the carrier 1 in a step-shaped recess 15 of the carrier 1 ver is slidable (Fig. 3).
  • the second guide bushing 13 has a clear cross section, which is, for example, 3.5 times larger than the clear cross section of the first guide bushing 8.
  • a plunger 16 mounted in the carrier 1 . slidably guided with flat end surface. This plunger 16 is initially at the end of the guide bushing 8, so that the two wire sections 5a and 6a are kept free of play between the compression needle 9 and the plunger 16.
  • the upsetting needle 9 is pushed into the guide bushing 8 in the direction of the arrow 17 and pulled back in synchronism with it, but at a reduced speed by a factor of 3.5 the plunger 16 in the direction of the arrow 17.
  • the upsetting needle 9 thus presses the wire sections 5a and 6a against the slower plunger 16, which serves as an abutment.
  • the consequence of this is that the cross section of the wire sections 5a and 6a widens by a factor of 3.5; the compression takes place when the material enters from the first guide bush 8 into the second guide bush 13.
  • the two wire sections 5a and 6a weld and form an essentially cylindrical blank 18.
  • the guide bush 20 and the needle 22 are then moved back by a certain preselectable distance L in the direction of the arrow 23. Synchronously with this, the needle 21 is moved in the same direction 23 (FIG. 6). In this way, a free space 24 is created between the slider 14 and the guide bushing 20, in which the rivet head is pre-compressed. This is done by doing feed of the needle 21 in the direction of the arrow g 23 against the stationary needle 22 as an abutment (Fig. 6). By upsetting the head, the end of the blank 18 protruding from the guide bushing 20 does not bend in the subsequent shaping process by which the head is finally shaped.
  • FIG. 7 also shows the moment of pre-upsetting, namely in a viewing direction rotated by 90 ° (direction of arrow 29 in FIG. 6).
  • the pre-upsetting needle 21 is withdrawn and the slide 14 in the direction of Arrow 29 moved.
  • a tool slide 25 is moved in the direction of arrow 31, which is arranged parallel to the slide 14.
  • the pre-compression needle 21 and a plunger 26 serving as a headmaker are mounted parallel to one another in the tool slide 25.
  • the headmaker 26 and an opening 30 in the slide 14 located between the headmaker 26 and the carrier 1 reach the guide bush 20 with the blank 18 therein.
  • the headmaker 26 has in its end face, which is normally at the level of the end face of the guide bush 20 in its starting position (FIGS. 5 and 6), a recess 27 which has the contour of the contact rivet head to be formed.
  • the guide bush 20 is now pushed together with the needle 22 inserted therein in the direction of the arrow 28 and strikes the pre-compressed blank 18 against the resting headmaker 26, as a result of which the head 32 obtains its final shape (FIG. 8).
  • the tool slide 25 is then moved in the direction of the arrow 28; it moves away from the carrier 1 and takes the 'headmaker 26 and the pre-compression needle 21 with it, so that the finished bimetal contact rivet 33 is released.
  • the needle 22 is advanced in the direction of the arrow 28 and throws the finished bimetal contact rivet 33, which until then was still with its shaft 34 in the guide bush 20, out of this (FIG. 9).

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Switches (AREA)
  • Insertion Pins And Rivets (AREA)
EP82102480A 1981-03-28 1982-03-25 Méthode de fabrication de rivets de contact bimétalliques Expired EP0062243B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3112453A DE3112453C2 (de) 1981-03-28 1981-03-28 Verfahren zur Herstellung von Bimetallkontaktnieten
DE3112453 1981-03-28

Publications (3)

Publication Number Publication Date
EP0062243A1 true EP0062243A1 (fr) 1982-10-13
EP0062243B1 EP0062243B1 (fr) 1985-01-30
EP0062243B2 EP0062243B2 (fr) 1989-01-11

Family

ID=6128658

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102480A Expired EP0062243B2 (fr) 1981-03-28 1982-03-25 Méthode de fabrication de rivets de contact bimétalliques

Country Status (5)

Country Link
US (1) US4446618A (fr)
EP (1) EP0062243B2 (fr)
DE (2) DE3112453C2 (fr)
ES (1) ES510767A0 (fr)
YU (1) YU67582A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4126220A1 (de) * 1991-08-08 1993-02-11 Duerrwaechter E Dr Doduco Verfahren zum herstellen von elektrischen kontaktnieten
WO1993003490A1 (fr) * 1991-08-08 1993-02-18 Doduco Gmbh + Co. Dr. Eugen Dürrwächter Procede de fabrication de plaquettes de contact
CN106862930A (zh) * 2016-12-26 2017-06-20 东莞市蓉工自动化科技有限公司 一种用于阳极零件的自动组装机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4585421A (en) * 1983-11-23 1986-04-29 The National Machinery Company Method of making copper-clad bimetal electrodes for spark plugs
CN1008141B (zh) * 1985-12-17 1990-05-23 田中贵金属工业株式会社 电触点及其制造方法
US5020217A (en) * 1990-02-06 1991-06-04 General Electric Company Methods for fabricating an electrical contact
US5366135A (en) * 1991-10-28 1994-11-22 Chugai Denki Kogyo K.K. Method of making composite electrical contact

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1472908A (fr) * 1960-07-11 1967-03-17 Renz Machine pour la fabrication de pièces de forme et en particulier de contacts bimétalliques
GB1079080A (en) * 1965-05-15 1967-08-09 Eugen Durrwachter Process and apparatus for the automatic manufacture of bimetal contact rivets
GB1198803A (en) * 1966-07-26 1970-07-15 Johnson Matthey Co Ltd Improvements in and relating to Methods of Making Bimetallic Rivet-Type Electrical Contacts

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3371414A (en) * 1959-12-01 1968-03-05 Talon Inc Method and apparatus for forming composite electrical contact elements
CH386212A (de) * 1959-12-23 1964-12-31 Duerrwaechter E Dr Doduco Verfahren und Vorrichtung zur fortlaufenden Herstellung von Bimetallkontaktnieten
DE2555697B2 (de) * 1975-12-11 1978-08-03 Dr. Eugen Duerrwaechter Doduco, 7530 Pforzheim Verfahren zum Herstellen von Doppelkontaktnieten
JPS6038217B2 (ja) * 1977-07-25 1985-08-30 中外電気工業株式会社 複合電気接点の製造装置
US4373369A (en) * 1980-03-27 1983-02-15 Modine Manufacturing Company Method of forming integral flanges in a sheet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1472908A (fr) * 1960-07-11 1967-03-17 Renz Machine pour la fabrication de pièces de forme et en particulier de contacts bimétalliques
GB1079080A (en) * 1965-05-15 1967-08-09 Eugen Durrwachter Process and apparatus for the automatic manufacture of bimetal contact rivets
GB1198803A (en) * 1966-07-26 1970-07-15 Johnson Matthey Co Ltd Improvements in and relating to Methods of Making Bimetallic Rivet-Type Electrical Contacts

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4126220A1 (de) * 1991-08-08 1993-02-11 Duerrwaechter E Dr Doduco Verfahren zum herstellen von elektrischen kontaktnieten
WO1993003511A1 (fr) * 1991-08-08 1993-02-18 Doduco Gmbh + Co. Procede de fabrication de rivets plaques de contact electrique
WO1993003490A1 (fr) * 1991-08-08 1993-02-18 Doduco Gmbh + Co. Dr. Eugen Dürrwächter Procede de fabrication de plaquettes de contact
CN106862930A (zh) * 2016-12-26 2017-06-20 东莞市蓉工自动化科技有限公司 一种用于阳极零件的自动组装机
CN106862930B (zh) * 2016-12-26 2019-06-07 东莞市蓉工自动化科技有限公司 一种用于阳极零件的自动组装机

Also Published As

Publication number Publication date
ES8301705A1 (es) 1983-02-01
DE3262097D1 (en) 1985-03-14
DE3112453A1 (de) 1983-04-28
DE3112453C2 (de) 1985-08-08
US4446618A (en) 1984-05-08
EP0062243B2 (fr) 1989-01-11
YU67582A (en) 1987-06-30
ES510767A0 (es) 1983-02-01
EP0062243B1 (fr) 1985-01-30

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