EP0062248B2 - Méthode de fabrication de rivets de contact à trois métaux - Google Patents

Méthode de fabrication de rivets de contact à trois métaux Download PDF

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Publication number
EP0062248B2
EP0062248B2 EP82102496A EP82102496A EP0062248B2 EP 0062248 B2 EP0062248 B2 EP 0062248B2 EP 82102496 A EP82102496 A EP 82102496A EP 82102496 A EP82102496 A EP 82102496A EP 0062248 B2 EP0062248 B2 EP 0062248B2
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Prior art keywords
abutment
upsetting
wire
needle
section
Prior art date
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Expired
Application number
EP82102496A
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German (de)
English (en)
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EP0062248B1 (fr
EP0062248A1 (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
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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 EP0062248A1 publication Critical patent/EP0062248A1/fr
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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
    • 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
    • B21K1/62—Making machine elements rivets special rivets, e.g. with electrical contacts

Definitions

  • the starting point of the invention is a method for producing tri-metal contact rivets by cold welding with the features specified in the preamble of claim 1. Such a method has become known from US-A 4073425.
  • three differently composed wire sections with matching cross sections are separated from a wire supply and are aligned in succession in a transversely displaceable guide bush between a compression needle displaceable in the guide bush and an abutment arranged outside the guide bush.
  • the middle wire section is usually made of copper, whereas the two outer, mostly shorter wire sections usually consist of silver.
  • a first deformation step only two of the wire sections are initially cold-welded to one another in the known method, by pushing the compression needle against the abutment held in place, an increase in diameter leading to cold welding occurring in a free space in front of the guide bush in the region of the abutting surfaces of two wire sections, while the two other abutment surfaces are still inside the guide bush.
  • the annular bead created by the cold welding is pressed flat and then sheared off by pushing the three wire sections out of the one guide bushing through the compression needle and pushing them into an opposite guide bushing, in which a further compression needle is arranged to be advanced.
  • the wire sections are compressed again in a subsequent deformation cut, whereby those two abutting surfaces of the wire sections, which were in the guide bush during the first deformation process, lie in free space and experience a cross-sectional enlargement leading to cold welding. while the two abutting surfaces welded together in the first deformation cut now lie in the guide bush in question and are not deformed again.
  • the rivet head of the tri-metal rivet is also preformed; in a further step, it is finally shaped into its final shape using a special headmaking tool.
  • a major disadvantage of the known method is that in addition to the steps of cutting and positioning the three wire sections, a total of four steps for plastic deformation are required to produce the tri-metal rivet, with new deformation tools sometimes having to be positioned between these four deformation steps.
  • the invention is based on the object of making available a process which is particularly suitable for mass production and which manages with fewer deformation steps than the known process.
  • the increase in diameter that occurs during upsetting should be selected so that perfect cold welding is guaranteed.
  • the speed ratios from abutment to upsetting needle specified in claim 3. With a value v W / v s ⁇ 0.25, there is only a progressively inadequate welding in the outer area of the abutting surfaces of the wire sections, while with 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 which protrudes from the other end into the guide bushing, there are the three wire sections, which face each other in pairs with their mutually facing ends and which abut the abutment needle or the upsetting needle with the two outer ends.
  • the compression needle is then advanced into the guide bushing at the speed Vs and the abutment is moved back from the bushing at the lower speed Vw in synchronism 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.
  • the upset portion of the wires does not necessarily require lateral guidance.
  • another guide bushing is 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.
  • Tall occupied end of the end plugs in a sleeve blank in the free space as far as first pre-dipped in front of the bush is that it can no longer during the subsequent second deformation impact umknicken - by applying two deformation blows with the precio is.
  • 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.
  • the method according to the invention requires only one deformation step instead of four deformation steps before shaping the rivet head. This means that machines that work according to the method according to the invention can produce much more cost-effectively than those that produce according to the known method.
  • Another advantage of the invention is that the essentially cylindrical blank is produced by a continuous flow process of the material, as a result of which the metallurgical structure is very much cheaper and more homogeneous than in the case of a tri-metal contact rivet produced according to the known method.
  • tri-metal contact rivets with a particularly thin noble metal layer can be produced.
  • the invention starts from thinner and correspondingly longer wire sections than the shaft of the finished tri-metal contact rivet because of the formation of the cylindrical blank with an enlarged diameter due to upsetting. If one assumes thinner wire sections than the shaft diameter of the finished tri-metal contact rivet, the volume fraction of the precious metal used per contact rivet can be reduced. It is not possible to cut pieces of wire of any length; therefore, if the length of the noble metal-containing wire section can be chosen to be thinner than before, then the saving of noble metals results from the reduction in cross-section.
  • 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. Shorter wire sections can hardly be handled anymore and no longer have a sufficiently smooth cutting surface suitable for cold welding.
  • the required larger shank diameter of the tri-metal contact rivet is obtained by compressing the wire sections, which also cold weld them together.
  • the length of the wire sections is shortened by the compression to the same extent as the cross section of the wires increases.
  • the length of the noble metal sections of the blank formed by compression and consequently the thickness of the noble metal layer on the fully formed contact rivet head can therefore be smaller than would be possible if the same outer dimensions of the wire sections were used to produce a tri-metal contact rivet, which already had a diameter with the Match the diameter of the shaft of the tri-metal contact rivet.
  • a tri-metal 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 two silver wire sections each 1.5 mm long and 1.64 mm in diameter. By compression, it becomes a blank of 3 mm in diameter and 9.90 mm in length, of which 2x0.45 mm are silver. After formation of the head of 6 mm in diameter with a remaining shaft length of 3.45 mm, there is silver on the head layer with an average thickness of only about 0.11 mm; the same savings result at the shaft end of the contact rivet, where another rivet head with silver coating is created when riveting; the amount of silver used is only about 20% compared to the previously described tri-metal contact rivet. 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.
  • FIGS. 1 to 10 schematically show an example of the sequence of the method according to the invention, showing the most important device elements which 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 displaced such 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 first 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), whereby the silver wire section 6a inserted in the guide bush 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 moved further in the direction of the arrow 12 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. 4).
  • the second guide bush 13 has a clear cross section, which e.g. 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 and having a flat end surface is displaceably guided. This plunger 16 is initially at the end of the guide bush 8, so that the three wire sections 5a, 5b 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 of the thrust egg 16 in the direction of the arrow 17 by a factor of 3.5 (see above).
  • the upsetting needle 9 thus presses the wire sections 5a, 5b 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, 5b and 6a widens 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 and 5a and 6b weld together and 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.
  • the needle 21 is moved in the same direction 23 (FIG. 7).
  • 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. 7).
  • FIG. 8 also shows the moment of pre-upsetting, namely in a viewing direction rotated by 90 ° (direction of arrow 29 in FIG. 7).
  • 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. 6 and 7), 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. 9).
  • 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 tri-metal contact rivet 33 is released.
  • the needle 22 is then advanced in the direction of the arrow 28 and throws the finished tri-metal contact rivet 33, which until then had been with its shaft 34 in the guide bush 20, out of the latter (FIG. 10).

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Switches (AREA)
  • Forging (AREA)

Claims (4)

1. Méthode de fabrication de rivets de contact à trois métaux par soudage à froid comprenant les étapes suivantes:
- disposer trois segments (5a, 6a, 6b) de longueur différente et de composition différente, mais de section transversale coïncidente, en alignement l'un derrière l'autre dans une douille de guidage (8) dont la section transversale intérieure coïncide avec la section transversale des segments de fil, entre une aiguille de refoulement (9) mobile longitudinalement dans la douille de guidage (8) et une contre-butée (16) disposée 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;
- refouler les segments de fil avec accroissement simultané de section transversale et souda-
ge à froid des segments de fil; - former la tête de rivet à partir des trois segments de fil à une extrémité de l'arrangement, caractérisée en ce qu'on refoule les trois segments de fil (5a, 6a, 6b) progressivement et continûment dans une étape de déformation pour en former une ébauche de rivet de contact approximative cylindrique, la contre-butée (16) - pendant que l'aiguille de refoulement (9), pour expulser les trois segments de fil, est déplacée dans la douille de guidage (8) jusqu'à l'extrémité de celle-ci dans la direction allant vers la contre-butée (16) - se déplaçant 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 trois 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).
EP82102496A 1981-03-28 1982-03-25 Méthode de fabrication de rivets de contact à trois métaux Expired EP0062248B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3112452A DE3112452C2 (de) 1981-03-28 1981-03-28 Verfahren zum Herstellen von Doppelkontaktnieten
DE3112452 1981-03-28

Publications (3)

Publication Number Publication Date
EP0062248A1 EP0062248A1 (fr) 1982-10-13
EP0062248B1 EP0062248B1 (fr) 1985-01-30
EP0062248B2 true EP0062248B2 (fr) 1989-01-18

Family

ID=6128657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102496A Expired EP0062248B2 (fr) 1981-03-28 1982-03-25 Méthode de fabrication de rivets de contact à trois métaux

Country Status (5)

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US (1) US4744502A (fr)
EP (1) EP0062248B2 (fr)
DE (2) DE3112452C2 (fr)
ES (1) ES510766A0 (fr)
YU (1) YU67682A (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3112452C2 (de) * 1981-03-28 1985-04-25 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Verfahren zum Herstellen von Doppelkontaktnieten
DE3521670A1 (de) * 1985-06-18 1986-12-18 Gesenkschmiede Schneider Gmbh, 7080 Aalen Verfahren und vorrichtung zum anstauchen von stabstahl
DE4126220A1 (de) * 1991-08-08 1993-02-11 Duerrwaechter E Dr Doduco Verfahren zum herstellen von elektrischen kontaktnieten
CN102842448A (zh) * 2011-06-24 2012-12-26 三菱综合材料C.M.I.株式会社 复合触点的制造方法
WO2013026315A1 (fr) * 2011-08-19 2013-02-28 桂林市森工机械技术开发有限公司 Inverseur et riveteuse à contact électrique composite triple comprenant l'inverseur

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739369A (en) * 1952-03-28 1956-03-27 Metals & Controls Corp Method of making electrical contacts
US3311965A (en) * 1965-02-09 1967-04-04 Talon Inc Apparatus for forming composite electrical contact elements
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
US3634934A (en) * 1968-12-26 1972-01-18 Johnson Matthey & Mallory Ltd Manufacture of composite materials
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
JPS5673826A (en) * 1979-11-22 1981-06-18 Chugai Electric Ind Co Ltd Method of manufacturing composite electric contact by cold solderless bonding
DE3112452C2 (de) * 1981-03-28 1985-04-25 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Verfahren zum Herstellen von Doppelkontaktnieten

Also Published As

Publication number Publication date
DE3112452A1 (de) 1983-04-28
EP0062248B1 (fr) 1985-01-30
ES8301704A1 (es) 1983-02-01
ES510766A0 (es) 1983-02-01
DE3112452C2 (de) 1985-04-25
DE3262098D1 (en) 1985-03-14
YU67682A (en) 1987-06-30
EP0062248A1 (fr) 1982-10-13
US4744502A (en) 1988-05-17

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