Electrically heatable caulking system and method

Details Electrically heatable caulking system and method Electrically heatable caulking system and method

1994-10-19

1995-10-31

Hughes, S. Thomas

Metal working

Method of mechanical manufacture

Assembling or joining

295241, 29DIG13, 7234292, 7234296, 72700, 219150R, 219150V, 219152, B21D 3900, B21J 508

Patent

active

054617685

ABSTRACT:
An electrical caulking method for a work made from a magnesium or a magnesium alloy wherein a caulking pin integrally projects from a body, wherein an electric caulking apparatus having two opposing electrodes is used. The work is held between the opposing electrodes so that one electrode contacts the caulking pin and the other electrode contacts the body while an electric current is applied between the electrodes and pressure is exerted therebetween, thereby caulking the caulking pin into a desired shape, and providing at least the one electrode that is brought into contact with the caulking pin of the work of a material having low thermal diffusivity and which is difficult to alloy with magnesium. The invention is also concerned with an electrical caulking system using an apparatus having two opposing electrodes for attaching the two members together and the members are positioned together so that the caulking pin is inserted into the inserting hole aligned with the caulking pin and making at least the one electrode which contacts the caulking pin of the work of a material having a low thermal diffusivity and difficult to alloy with magnesium.

REFERENCES:
patent: 2206426 (1940-07-01), Phelps
patent: 2237121 (1941-04-01), Stine et al.
patent: 5054301 (1991-10-01), Soga et al.
Patent Abstract of Japan, Apr. 1985 vol. 9, No. 87, p. 73 M 372, #59-215224 Dec. 5, 1984.
Patent Abstract of Japan, Dec. 1986 vol. 10, No. 372, p. 108 M 544, #61-165247 Jul. 25, 1986.
Soviet Inventions Illustrated, Jan. 1981, section EL, week C47, p. 30, #SU 727 309 (Smirnov).
Soviet Patents Abstract, Sep. 1991, section S-X, week 9129, p. 19, #SU 1606 254 (Ufa).
Haessly, W. F., "Metal Gathering by the Resistance--Heating Process", The Welding Journal, pp. 132-140, Feb. 1957.

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