Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1986-09-12
1988-02-02
Spruill, Robert L.
Metal working
Method of mechanical manufacture
Assembling or joining
228118, 228171, 228122, 228221, 228248, 76DIG11, B21D 3900
Patent
active
047221259
ABSTRACT:
A method for producing a tungsten carbide tip punch includes:
(1) preparing a punch rod including a top surface having a cylindrical protrusion;
(2) placing on the top surface of the punch rod a tungsten carbide piece having a hardness greater than that of the punch rod and including a bottom surface having a crown-like indentation which opens at the bottom surface and which is capable of being well matched with said cylindrical protrusion at the lowermost portion of the crown-like indentation.
(3) applying a brazing material on the vertices of the crown-like indentation and around the interengaging surfaces of the punch rod and the tungsten carbide piece;
(4) pushing the cylindrical protrusion of the punch rod into the crown-like indentation of the tungsten carbide piece by a hydraulic activating apparatus so that the top of the cylindrical protrusion deforms along the vertices into a crown-like shape to join the punch rod and the tungsten carbide piece together; and
(5) vacuum heating the brazing material and the interengaging surface for flow of the molten brazing material over all the interengaging surface to further bond them together.
REFERENCES:
patent: 1648026 (1927-11-01), Murray
patent: 1690240 (1928-11-01), Norcross
patent: 2334755 (1943-11-01), Eglinton
patent: 3677060 (1972-07-01), Loqvist
patent: 3906617 (1975-09-01), Behringer et al.
patent: 4442968 (1984-04-01), McMurray et al.
Jones David B.
Spruill Robert L.
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