Metal deforming – By extruding through orifice – Utilizing internal forming means
Patent
1990-10-15
1992-07-21
Spruill, Robert L.
Metal deforming
By extruding through orifice
Utilizing internal forming means
B21C 2504
Patent
active
051312530
ABSTRACT:
A carbide mandrel for an extrusion die apparatus having a holder portion, a mandrel portion and a tapered intermediate portion joining the mandrel portion with the holder portion. The holder portion has a pair of recessed longitudinal guideway provided in its opposite sides. The holder portion is received in a longitudinal mandrel slot of a retainer collar mountable to an extrusion die apparatus. A pair of opposing longitudinal ribs protruding from the facing sides of the mandrel slot permit the holder portion of the carbide mandrel to be slidably inserted into the mandrel slot of the retainer collar. The mandrel portion has a linear array of micro mandrel elements receivable in a rectangular die aperture. The carbide mandrel is made from sintered carbide material which has a softening temperature significantly higher than the temperatures experienced during the extrusion process and sufficient hardness to be practically wear resistant.
REFERENCES:
patent: 1989948 (1935-02-01), Singer
patent: 2366344 (1945-01-01), McFadden
patent: 3240047 (1966-03-01), Long et al.
patent: 3541831 (1970-11-01), Simonton
patent: 4169366 (1979-10-01), Ames
patent: 4378686 (1983-04-01), Pardoe
"Tool Design Tips for Cold Extrusion", Machinery, pub. on May 1968; pp. 104-110.
Gurley D. M.
Spruill Robert L.
VanOphem Remy J.
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