US2761943A - Method of transmitting electric current from one body to another - Google Patents

Method of transmitting electric current from one body to another Download PDF

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Publication number
US2761943A
US2761943A US385029A US38502953A US2761943A US 2761943 A US2761943 A US 2761943A US 385029 A US385029 A US 385029A US 38502953 A US38502953 A US 38502953A US 2761943 A US2761943 A US 2761943A
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United States
Prior art keywords
contact
transmitting electric
electric current
another
contact material
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Expired - Lifetime
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US385029A
Inventor
Kihlander Helge Oskar
Foodge Carl Erik
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.)
Hellefors Bruks AB
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Hellefors Bruks AB
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys

Definitions

  • a conductive contact material is used, which is produced by pressing and/ or sintering iron powder or some other metal powder or by reduction of ore in the form of powder or pieces and which is easily mouldable by plastic deformation, the body with which good contact is to be obtained, being pressed into said contact material, so that the contact material is deformed through the contact pressure, whereby the contact surface is greatly increased in relation to the surface obtained when employing the method earlier known, and the contact surface can be completely utilized for the transmission of current.
  • the current density is reduced and the material is uniformly heated. Also in the heating of other materials, for instance materials of unalloyed carbon steel the heat transmission is improved as is also the insensibility to difficulties caused by rough end surfaces.
  • the contact material should be easily plastically deformable when the pressure is lower than 5 or 10 kgs./'mm. preferably lower than 2 kgs/mm In certain cases the pressure may be as low as 0.01 kg/mm or still lower, when loose powder is used. It is possible either to use fresh contact material for each heating operation or the contact material may be used for a number of operations. In the latter case contact material in the form of plates, for example of iron sponge, is preferred. Naturally the method according to the invention can be employed, not only when heating is concerned, but also for transmission of current for other purposes.
  • a method of transmitting electric current for the resistance heating of rolling or forging metal blanks comprising the steps of placing an electrically-conducting readily deformable sponge-metal contact material adjacent one of said blanks, pressing said blank into the spongy contact material so that said material is deformed to provide a large contact surface, and applying a resistance heating current to said blank through said spongy contact material.
  • a method of transmitting electric current for the resistance heating of rolling or forging steel blanks comprising the steps of placing an electrically-conducting readily deformable iron-sponge contact material adjacent one of said blanks, pressing said blank into the spongy contact material so that said material is deformed to provide a large contact surface, and applying a resist ance heating current to said blank through said spongy contact material.

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  • Contacts (AREA)
  • Powder Metallurgy (AREA)

Description

United States Patent METHOD OF TRANSMITTING ELECTRIC CUR- RENT FROM ONE BODY T O ANOTHER Helge Oskar Kihlander and Carl Erik Foodge, Hallefors,
Sweden, assignors t Hellefors Bruks Aktieholag, Hallefors, Sweden, 21 company of Sweden N0 Drawing. Application October 8, 1953, Serial No. 385,029
Claims priority, application Sweden October 11, 1952 3 Claims. (Cl. 219154) connected directly to contact materials earlier known, for
example copper, can transmit the necessary current intensity. According to the present invention a conductive contact material is used, which is produced by pressing and/ or sintering iron powder or some other metal powder or by reduction of ore in the form of powder or pieces and which is easily mouldable by plastic deformation, the body with which good contact is to be obtained, being pressed into said contact material, so that the contact material is deformed through the contact pressure, whereby the contact surface is greatly increased in relation to the surface obtained when employing the method earlier known, and the contact surface can be completely utilized for the transmission of current. The current density is reduced and the material is uniformly heated. Also in the heating of other materials, for instance materials of unalloyed carbon steel the heat transmission is improved as is also the insensibility to difficulties caused by rough end surfaces.
The reason why it has proved impossible to heat materials of alloyed tool steel by means of resistance heating by employing methods already known, must be that point contact was obtained between the contact piece and the blank. The result was a punctal heating, and as steel is not sufliciently conductive to make away with the rapidly heated spot or spots, there will be a fusion, and the blank will be ruined.
A great number of experiments have proved that by using a suitable plastic, powder metallurgic contact material between the current conductors and the blank to be heated, for example iron or copper sponge, good cur- Patented Sept. 4:, 1515f;
rent-carrying contacts are obtained, whether the contact surface of the blank is rough or not. This is of particularly great importance when the transmission of current is intended for the heating of blanks to be rolled, when for natural reasons a rough end surface cannot be avoided. The contact material should be easily plastically deformable when the pressure is lower than 5 or 10 kgs./'mm. preferably lower than 2 kgs/mm In certain cases the pressure may be as low as 0.01 kg/mm or still lower, when loose powder is used. It is possible either to use fresh contact material for each heating operation or the contact material may be used for a number of operations. In the latter case contact material in the form of plates, for example of iron sponge, is preferred. Naturally the method according to the invention can be employed, not only when heating is concerned, but also for transmission of current for other purposes.
Having now described our invention, what we claim as new and desire to secure by Letters Patent is:
1. A method of transmitting electric current for the resistance heating of rolling or forging metal blanks comprising the steps of placing an electrically-conducting readily deformable sponge-metal contact material adjacent one of said blanks, pressing said blank into the spongy contact material so that said material is deformed to provide a large contact surface, and applying a resistance heating current to said blank through said spongy contact material.
2. A method of transmitting electric current for the resistance heating of rolling or forging steel blanks comprising the steps of placing an electrically-conducting readily deformable iron-sponge contact material adjacent one of said blanks, pressing said blank into the spongy contact material so that said material is deformed to provide a large contact surface, and applying a resist ance heating current to said blank through said spongy contact material.
3. A method of transmitting electric current as defined in claim 1 wherein said spongy metal contact is smeared or sprayed onto said metal blank.
References Cited in the file of this patent UNITED STATES PATENTS 1,665,367 Johnson et al. Apr. 10, 1928 2,013,585 Sciaky Sept. 3, 1935 2,248,280 Nobiron July 8, 1941 2,355,954 Cremer Aug. 15, 1944 2,425,052 Swinehart Aug. 5, 1947 2,467,636 Stoudt et al. Apr. 19, 1949 2,486,341 Stumbock Oct. 25, 1949
US385029A 1952-10-11 1953-10-08 Method of transmitting electric current from one body to another Expired - Lifetime US2761943A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2761943X 1952-10-11

Publications (1)

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US2761943A true US2761943A (en) 1956-09-04

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US385029A Expired - Lifetime US2761943A (en) 1952-10-11 1953-10-08 Method of transmitting electric current from one body to another

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1665367A (en) * 1921-03-25 1928-04-10 American Car & Foundry Co Electric heater
US2013585A (en) * 1933-04-06 1935-09-03 Sciaky David Electric welding apparatus
US2248280A (en) * 1938-07-27 1941-07-08 Marie Louise Nobiron Machine for heating metal bars and tubes
US2355954A (en) * 1942-03-04 1944-08-15 Hardy Metallurg Company Powder metallurgy
US2425052A (en) * 1944-03-08 1947-08-05 Cutler Hammer Inc Electrical contact materials and contacts and methods of making the same
US2467636A (en) * 1948-07-24 1949-04-19 Ames Spot Welder Co Inc Electrode die for welding apparatus
US2486341A (en) * 1945-06-30 1949-10-25 Baker & Co Inc Electrical contact element containing tin oxide

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1665367A (en) * 1921-03-25 1928-04-10 American Car & Foundry Co Electric heater
US2013585A (en) * 1933-04-06 1935-09-03 Sciaky David Electric welding apparatus
US2248280A (en) * 1938-07-27 1941-07-08 Marie Louise Nobiron Machine for heating metal bars and tubes
US2355954A (en) * 1942-03-04 1944-08-15 Hardy Metallurg Company Powder metallurgy
US2425052A (en) * 1944-03-08 1947-08-05 Cutler Hammer Inc Electrical contact materials and contacts and methods of making the same
US2486341A (en) * 1945-06-30 1949-10-25 Baker & Co Inc Electrical contact element containing tin oxide
US2467636A (en) * 1948-07-24 1949-04-19 Ames Spot Welder Co Inc Electrode die for welding apparatus

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