B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
205/13
B21C 25/06 (2006.01) B21C 23/14 (2006.01) B21C 25/08 (2006.01) B21K 1/06 (2006.01)
Patent
CA 1117899
METHOD OF COLD FORMING TUBES WITH INTERIOR THICKER WALL SECTIONS ABSTRACT A method for cold forming metal tubes with inwardly thickened wall sections including positioning a short, tubular blank in a die having an extrusion die throat, and pushing the blank through the die throat with a punch. The punch is formed with a co-axial mandrel-like extension which fits within the blank and die throat. The extension is formed of co-axial sections of successively smaller diameter. Thus, as the punch pushes the end of the blank to move the blank through the die throat, a narrower diameter extension section fits within the die throat to extrude a thickened end portion. Thereafter, continued punch movement positions a wider mandrel forming extension section within the die throat to extrude a thin wall tube section. At a point where a wall thickened section is to be formed interiorly of the tube, the punch is removed and replaced by a different punch having a mandrel forming extension of different diameter than that mentioned above, wherein movement of the second punch results in the extrusion of a thickened tube section in the annular space between the extension section and the die throat, with continued punch movement thereafter positioning a further punch extension within the die throat for forming additional thin wall sections on the tube. The trailing end of the blank may then be provided with a thickened end section similar to the leading end of the blank by utilizing the initial punch in place of the second punch.
350771
Frayne & Company Robert
Simon Joseph A.
LandOfFree
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