Metal deforming – By extruding through orifice – Expressing non-uniform cross-section or non-linear product
Patent
1990-03-08
1991-01-08
Spruill, Robert L.
Metal deforming
By extruding through orifice
Expressing non-uniform cross-section or non-linear product
72266, 72370, B21C 2310, B21C 2504
Patent
active
049825925
ABSTRACT:
A metal tube, such as a valve body sleeve, is cold extruded to form full length and partial length longitudinal channels in its interior wall surface. The channeled tube is formed by extruding a metal, tubular blank, through an open ended die having an extrusion die throat at one end. A punch is inserted in the die and bears against an end of the blank for pushing the blank longitudinally through the die throat. The punch has an extension, having a leading edge section and a trailing edge section that pass through the blank. Longitudinally extending teeth are formed on the two sections, with some of the teeth being continuously longitudinally aligned and others being located only on the trailing section. Initially, the leading section is arranged within the die throat and the leading end portion of the blank is extruded through the die throat, around the extension leading section to form channels therein. Then, the punch trailing section is within the die throat as the punch continuously pushes the blank through the die throat so as to continue the formation of the channels started by the leading sections while simultaneously forming channels in the intermediate portion of the blank. Then, the punch is removed, a new blank is inserted against the first blank, and the punch is replaced for pushing the second blank, and thereby, the first blank through the die throat while the punch leading section is positioned within the die throat so as to continue the formation of full length channels while discontinuing the formation of partial channels within the intermediate portion of the blank.
REFERENCES:
patent: 3886649 (1975-06-01), Simon
patent: 3942728 (1980-06-01), Hilton
patent: 3948073 (1976-04-01), Lovell
patent: 4292831 (1981-10-01), Simon
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