US3579261A - Making of rivet head bimetallic electrical contacts - Google Patents

Making of rivet head bimetallic electrical contacts Download PDF

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Publication number
US3579261A
US3579261A US767321A US3579261DA US3579261A US 3579261 A US3579261 A US 3579261A US 767321 A US767321 A US 767321A US 3579261D A US3579261D A US 3579261DA US 3579261 A US3579261 A US 3579261A
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US
United States
Prior art keywords
wire
wires
contact
welding
head
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
US767321A
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English (en)
Inventor
Hans Wacker
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.)
RENZ WACKER AND CO
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RENZ WACKER AND CO
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Filing date
Publication date
Application filed by RENZ WACKER AND CO filed Critical RENZ WACKER AND CO
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Publication of US3579261A publication Critical patent/US3579261A/en
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • 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
    • H01H11/043—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 resistance welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/32—Wires

Definitions

  • This invention relates to a method and apparatus for the production of resistance welded-shaped parts and especially to bimetallic welded electrical contacts made of wire in which the contact head is larger than the diameter of the original wire.
  • Welded-shaped products such as bimetallic-welded wire contacts of different metals, are produced either by cold-press welding or electrical resistance welding, that is, hot welding.
  • Bimetallic contacts produced by heat welding can be made without an upsetting fold in a limited manner, that is, with a relatively low head thickness of about I mm.
  • Contacts have been produced from strip-plated bands or ribbons which are made by welding a layer of precious metal, such as fine silver and its alloys, on a layer of base metal, such as iron or monei, or by soldering under pressure inwhich a flux is used between the two combined metals. Thereafter discs are stamped out of the fine metallic bands. These discs are fed into presses or stamping tools in which they are upset to form the finished head and/or welded contact.
  • the strip-plated bands are also made by the cold-press welding of the metal components. This method is principally currently used in the United States. Again, discs are stamped out of the bands, which discs are then formed into the rivet contacts.
  • the strip-plated bands can also be produced on middle and/or high frequency automats into which a precious metal and a base metal band are fed. and followed by a welding process. After the welding, the bands are soft.
  • the final The aforesaid method of producing strip-plated bands has numerous disadvantages.
  • the forming of the initial stripplated starting material is very expensive. Because the discs have to be stamped out of the striplike plated material, there is a relatively high waste since it is expensive to separate the precious metal from the base metal in the waste or scrap. F urthermore, the volume rate of production in these methods is relatively low. Also, the reduction burning welding machine with electronic control is very costly.
  • discs are stamped from the base metal. These discs are fed into reduction welding machines which weld an exactly measured coating or layer of precious metal onto the disc from a roll of wire controlled by an electronically programmedmachine. Following this is the pressing process to obtain the finished head and/or welded contact.
  • This method is principally used in the U.S.A. and in England and is known under the term paddling".
  • the metal wire and in a direct current condenser discharge surge welding process with the diameter that is the same as that of the base metal wire, as well as with various lengths of wire components in relation and depending upon the difference in the conductivity of the wire ends which are welded together.
  • the wires are fed toward each other until the two end abutting surfacesmeet and then are butt welded together in a flat seam.
  • a welded piece of any desired length is then cut off and introduced into a press for shaping the contact head.
  • the length of the metal conductors as well as the diameter of the wires is changed in order to equalize the difference in the electrical conductivity values.
  • the head is shaped by means of a continuous movement of the upsetting die in an assembly line pressing process with a simultaneous continuous forward feeding of the initial wire from the support. Following 'the preshaping of the head by means of this continuous pressing operation, it is possible to finish the head by means of one single upsetting hammer stroke.
  • the apparatus for performing the method of this invention has a die for holding the wire which is to be upset in which is a rod driven by a cam having several cam surfaces following one another, the wire being driven against a counter springloaded die which is retarded in movement by a cam having a continuous surface.
  • the first three surfaces form a rising straight line and the following two surfaces intersect in an-obtuse angle Y.
  • FIG. 1 is a crossasectional view through the welding apparatus
  • FIG. 2 is a cross-sectional view through the upsetting rivet head tool
  • FIG. 3 is a'view similar to FIG. 2 showing a further step in the upsetting operation
  • FIG. 4 is a detailed view of a part of FIG. 3 showing the final form of the rivet head
  • FIG. 5 is an enlarged cross-sectional view through a partially formed bimetallic contact
  • FIG. 6 is a view similar to FIG. 5 showing the finished contact-head
  • FIG. 1 is a View similar to FIG. but showing a modified are feeding slides'joined on one side to the welding trans-' former by copper bands and the other side being connected to shearing knives 5.
  • the distance between the contacting ends of the wires 1 and 2 from the shearing knives 5 depends upon the difference in the electrical conductivity of the wires being welded and varies in this butt welding process.
  • the welding surges are initiated by means of a transistorized welding machine control, not shown, and this causes the welding of the abutting ends of the wires 1 and 2.
  • the electrodes 3 and 4 forming the forward feeding slides are moved into cutting position for the length of wire desired.
  • the adjustable shearing knife blade 6 moves in the direction of the arrow C and shears off the length of the welded-wire in cooperation with the knives 5.
  • the finger 7 mounted in a reciprocatable slide 8' which moves in the direction of the arrow D picks up the sheared off bimetallic wire 12 and carries it to the entrance of die 9.
  • the springloaded initial die press 10 pushes the bimetallic wire into the opening in the die 9. which, in turn, is carried by a block 11.
  • Bimetallic wire 12 is then pushed by an upsetting shaft 13 driven by a plunger 14 against the die 10.
  • the plunger 14 has at its opposite ehd a cylindrical pin 15 which, in turn, is driven by a continuously rising eccentric cam 16.
  • the spring-loaded initial die 10 which is mounted in a recess 17 attached toa roller slide 18 moves slowly back with its movement being controlled by the curved cam 19.
  • the cam surfaceof cam 19 is such that the movement is limited to about from L5 to 2 mm.
  • the upsetting .shaft 13 for forming the contact has a recess in the end of the shaft for forming a contact with a welding boss on it, as indicated in FIG. 4. If the required finished form cannot be obtained by the continuous pressing operation alone, then the cam can be shaped to give a final upsetting stroke to finish the electrical contact. If desired, a third cam can be employed for this'purpose.
  • FIGS. 5 to 8 Two different types of electrical contacts are shown in FIGS. 5 to 8 In FIGS. 5 and 6, the'bimetallic contact has a stern, and in FIGS. 7 and 8 the bimetallic contact has a welding boss.
  • FIGS. 5 and 7 show the preformed contacts, and
  • FIGS. 6 and 8 show the complete finished contacts.
  • the contact in FIGS. 5 and 6 has been welded from two pieces of wire to form a bimetallic rivet contact formed with a layer of precious metal 20 on the head of base metal 21 which includes a stem 22.
  • These rivet contacts are used mainly for the removable and exchangeable contacts with springs, for example, for switches and relays in the electricalfield.
  • the contact shown in FIGS. 7 and 8 is also made from welded wires so that the final contact has a precious metal layer 23 on the head 24 of base metal and which includes a welding boss 25.
  • These welded contacts are used primarily for the permanent and irreplaceable welding of contact springs and contact bands for switches and relays.
  • A-method of making bimetallic electrical contacts comprising the steps of feeding the ends of two elongated wires

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Switches (AREA)
  • Resistance Welding (AREA)
  • Wire Processing (AREA)
US767321A 1967-10-12 1968-10-14 Making of rivet head bimetallic electrical contacts Expired - Lifetime US3579261A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1626696 1967-10-12
DER0047116 1967-10-12
DE1627696A DE1627696B2 (de) 1967-10-12 1967-10-12 Verfahren zur Herstellung von stumpfgeschweißten Bimetallteilen aus Drähten verschiedenen Metalls, insbesondere von Bimetallkontakten

Publications (1)

Publication Number Publication Date
US3579261A true US3579261A (en) 1971-05-18

Family

ID=27180934

Family Applications (1)

Application Number Title Priority Date Filing Date
US767321A Expired - Lifetime US3579261A (en) 1967-10-12 1968-10-14 Making of rivet head bimetallic electrical contacts

Country Status (4)

Country Link
US (1) US3579261A (enrdf_load_stackoverflow)
CH (1) CH482479A (enrdf_load_stackoverflow)
DE (1) DE1627696B2 (enrdf_load_stackoverflow)
FR (1) FR1589272A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2483681A1 (fr) * 1980-05-27 1981-12-04 Renz Wacker & Co Maschf Procede et appareil pour la fabrication de contacts bimetalliques a souder
US20050006356A1 (en) * 2001-12-28 2005-01-13 Abb Service Srl Method for welding contact plates and contact elements obtained with the method
CN111687357A (zh) * 2019-03-15 2020-09-22 厦门金波贵金属制品有限公司 一种辅助成型定位的冷镦结构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3590880T1 (enrdf_load_stackoverflow) * 1985-11-26 1987-11-19

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1309523A (en) * 1919-07-08 hosford
US1462775A (en) * 1920-11-02 1923-07-24 Trivelloni Angelo Process for the manufacture of nails formed in two parts

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1309523A (en) * 1919-07-08 hosford
US1462775A (en) * 1920-11-02 1923-07-24 Trivelloni Angelo Process for the manufacture of nails formed in two parts

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2483681A1 (fr) * 1980-05-27 1981-12-04 Renz Wacker & Co Maschf Procede et appareil pour la fabrication de contacts bimetalliques a souder
US20050006356A1 (en) * 2001-12-28 2005-01-13 Abb Service Srl Method for welding contact plates and contact elements obtained with the method
US7592566B2 (en) * 2001-12-28 2009-09-22 Abb S.P.A. Method for welding contact plates and contact elements obtained with the method
CN111687357A (zh) * 2019-03-15 2020-09-22 厦门金波贵金属制品有限公司 一种辅助成型定位的冷镦结构

Also Published As

Publication number Publication date
CH482479A (de) 1969-12-15
FR1589272A (enrdf_load_stackoverflow) 1970-03-23
DE1627696A1 (de) 1970-10-22
DE1627696B2 (de) 1974-11-07

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