GB569126A - Swaging of hollow bodies - Google Patents

Abstract

569,126. Die-rolling tubular articles. BAKER, G. July 20, 1939, No. 21075. [Classes 83 (ii) and 83 (iv)] Making projectiles.-An external taper is imparted to shell forgings, Fig. 1, by rolling axially between at least three rolls, the taper being dependent upon a relative axial traverse between the blank and relatively narrow surfaces on the rolls, the remainder of the roll surfaces finishing the cylindrical part of the shell. As arranged for four rolls 1, Figs. 4 and 5, with reducing surfaces 2, pass adjustment is effected by mounting the rolls in pairs in cradles 4 pivoted in the housing 5 at one end and carrying rolls 8 at the other in contact with cams 7 linked to a standard. 11 located by a back-stop 13 and traversed by contact with the ram 15 that feeds the mandrel 14 carrying the work between the rolls. The resulting advance of the rolls during the latter part of the travel of the mandrel tapers the work, as shown in dotted lines in Fig. 1. If the pierced billet has too much external taper, it may be rendered parallel by a preliminary drawing operation. The bore of the 'blank may be enlarged at the open end, being closed on to a parallel mandrel during rolling. Separating mandrels from work.-On the return stroke of the ram 15 contact of the standard 11 with the stop 13 causes stripping of the blank from the mandrel.