EP0062243B2 - 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
EP0062243B2
EP0062243B2 EP82102480A EP82102480A EP0062243B2 EP 0062243 B2 EP0062243 B2 EP 0062243B2 EP 82102480 A EP82102480 A EP 82102480A EP 82102480 A EP82102480 A EP 82102480A EP 0062243 B2 EP0062243 B2 EP 0062243B2
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EP
European Patent Office
Prior art keywords
upsetting
abutment
needle
wire
guide bushing
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
Application number
EP82102480A
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German (de)
English (en)
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EP0062243A1 (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
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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
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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 bimetal contact rivets by cold welding with the features specified in the preamble of claim 1.
  • a method is e.g. B. is known from GB-A-1 079 080.
  • 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 cut surfaces by pressure and enlargement of the contact surface. The enlargement of the contact surface is also used to form the rivet head.
  • 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, that is, it also serves as a headmaker, so that when the wire sections between the compression needle and the abutment are compressed, the rivet head is also formed or 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 contact surfaces made of silver have resulted in considerable silver savings.
  • the increasing cost of precious metals has led to efforts to reduce the use of precious metals in bimetal contact rivets.
  • So z. B. has already been proposed to provide the precious metal only in the center of the contact surface, but such bimetallic rivets are relatively expensive to manufacture on the one hand, on the other hand, they only seem to save precious metals, because a contact surface requires a certain minimum size for a given application; replacing the precious metal in the edge area with base metal would adversely affect the switching behavior.
  • bimetallic rivets As far as the production of bimetallic rivets is based on plated strand-shaped semi-finished products, it is no problem to keep the precious metal layer as thin as desired.
  • the production of bimetallic contact rivets from strand-shaped semifinished products is so complex that such rivets are many times more expensive than rivets which are produced from wire by cold welding. In the latter method, however, the precious metal layer cannot be made as thin as desired. The reason is simply that it is not possible to cleanly cut and handle wire sections of any length.
  • silver wire with a diameter D requires a minimum length of the wire sections of approximately 0.5 D to 0.8 D, the lower value 0.5 D for very thick and the upper value 0.8 D for very thin wires.
  • 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 bimetal contact rivets made from wire by cold welding with a thinner noble metal coating than previously.
  • an essentially 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 method according to 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 method according to the invention is based on thinner wires, the volume fraction of the noble 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, the reduction in cross-section results in the noble metal being saved.
  • the required larger shaft diameter of the bimetallic contact rivet is obtained by compressing the wire sections, which also cold weld them 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 perfect cold welding is guaranteed.
  • 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 w synchronously with it.
  • An upsetting cannot take place inside the guide bushing, 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 face.
  • 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, the cross-sectional area of the wire sections before upsetting and F z means those after upsetting.
  • the upset portion of the wires does not necessarily require lateral guidance.
  • a further guide bushing is preferably used for this purpose, the clear cross section of which is just F 2 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 can be produced by a cold welding process from the prior art, which has the following typical dimensions:
  • a bimetallic contact rivet with essentially identical external dimensions can be produced from a copper wire section 30 mm long and 1.64 mm in diameter and from a silver wire section 1.5 mm long and 1.64 mm in 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 formation of 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 about 0.11 mm, i.e. H. the amount of silver used is only about 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 most 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 bushes 2 and 3 are in alignment with a flat surface 10 of the carrier 1, on which a slide 7 can be displaced.
  • 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 shifted in this way. 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 slide 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 14, 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 is displaceable (Fig. 3).
  • the second guide bush 13 has a clear cross section, which, for. B. is larger by a factor of 3.5 than the clear cross section of the first guide bushing 8.
  • a plunger 16 mounted in the carrier 1 is displaceably guided with a flat end face. This plunger 16 is initially at the end of the guide bush 8, so that the two wire sections 5a and 6a between the compression needle 9 and the plunger 16 are kept largely free of play.
  • 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 is expanded by a factor of 3.5; the compression occurs when the material enters from the first guide bush 8 into the second guide bush 13.
  • the two wire sections 5a and 6a weld together to form a 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 advancing the needle 21 in the direction of arrow 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 is moved in the direction of arrow 29.
  • 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 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 arrow 28 and throws the finished bimetallic 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)

Claims (4)

1. Méthode de fabrication de rivets de contact bimétalliques par soudage à froid comprenant les étapes suivantes :
introduire deux segments de fil (5a, 6a) de longueur différente et de composition différente mais de section transversale coïncidante l'un derrière l'autre dans une douille de guidage appropriée (8),
disposer les deux segments de fil (5a, 6a) bout à bout entre une aiguille de refoulement (9) mobile longitudinalement dans la douille de guidage (8) et une contrebutée (16) disposée (16) à l'extérieur de la douille de guidage (8) coaxialement à l'aiguille de refoulement (9) et dont la surface active en section transversale est supérieure à la surface en section transversale des segments de fil (5a, 6a),
refouler les deux segments de fil pour provoquer le soudage à froid, en réduisant la distance entre l'aiguille de refoulement (9) et la contre-butée (16) et en faisant avancer en même temps l'aiguille de refoulement dans la douille de guidage,
former la tête de rivet (32) à partir des deux segments de fil à l'extrémité de l'arrangement où se trouve le segment de fil court (6a), caractérisée en ce que pour réaliser le refoulement des segments de fil (5a, 6a) précédant le formage de la tête de rivet (32) pour en former une ébauche de rivet de contact approximative cylindrique avec une section transversale excédant la section transversale des segments de fil (5a, 6a) avant le refoulement - pendant que l'aiguille de refoulement (9), pour expulser les deux segments de fil (5a, 6a), est déplacé dans la douille de guidage (8) jusqu'à l'extrémité de celle-ci dans la direction allant vers la contre-butée (16) - la contre-butée (16) se déplace dans la direction indiquée par l'aiguille de refoulement (9), que la vitesse de la contre-butée (16) est inférieure à la vitesse de l'aiguille de refoulement (9) et que les deux vitesses sont dans un rapport mutuel constant.
2. Méthode selon la revendication 1, caractérisée en ce que le rapport des vitesses de l'aiguille de refoulement (9) et de la contre-butée (16) est réglable.
3. Méthode selon la revendication 1 ou la revendication 2, caractérisée en ce que le rapport de la vitesse (vs) de l'aiguille de refoulement (9) et la vitesse (vw) de la contre-butée (16) est choisi, pour l'utilisation de segments de fil en cuivre d'une part et en argent d'autre part, entre
Figure imgb0007
de préférence entre
Figure imgb0008
4. Méthode selon la revendication 1 ou la revendication 2, caractérisée en ce que pendant le refoulement la portion refoulée des deux segments de fil est guidée dans une seconde douille de guidage (13), dans laquelle la contre-butée (16) est mobile et dont la section transversale intérieure est dans le même rapport à la section transversale intérieure de la première douille de guidage (8) que la vitesse (vs) de l'aiguille de refoulement (9) à la vitesse (vw) de la contre-butée (16).
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
DE3112453 1981-03-28
DE3112453A DE3112453C2 (de) 1981-03-28 1981-03-28 Verfahren zur Herstellung von Bimetallkontaktnieten

Publications (3)

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

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US (1) US4446618A (fr)
EP (1) EP0062243B2 (fr)
DE (2) DE3112453C2 (fr)
ES (1) ES8301705A1 (fr)
YU (1) YU67582A (fr)

Families Citing this family (7)

* 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
DE4126219A1 (de) * 1991-08-08 1993-02-11 Duerrwaechter E Dr Doduco Verfahren zum herstellen von kontaktplaettchen
DE4126220A1 (de) * 1991-08-08 1993-02-11 Duerrwaechter E Dr Doduco Verfahren zum herstellen von elektrischen kontaktnieten
US5366135A (en) * 1991-10-28 1994-11-22 Chugai Denki Kogyo K.K. Method of making composite electrical contact
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

Family Cites Families (8)

* 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
FR1472908A (fr) * 1960-07-11 1967-03-17 Renz Machine pour la fabrication de pièces de forme et en particulier de contacts bimétalliques
CH460496A (de) * 1965-05-15 1968-07-31 Eugen Duerrwaechter Doduco Kg Maschine zur automatischen Herstellung von Bimetall-Kontaktnieten aus Draht durch Kaltschweissen
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
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

Also Published As

Publication number Publication date
DE3112453A1 (de) 1983-04-28
EP0062243A1 (fr) 1982-10-13
YU67582A (en) 1987-06-30
ES510767A0 (es) 1983-02-01
EP0062243B1 (fr) 1985-01-30
DE3112453C2 (de) 1985-08-08
US4446618A (en) 1984-05-08
DE3262097D1 (en) 1985-03-14
ES8301705A1 (es) 1983-02-01

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