GB554833A - A method of producing hollow or cup-like metal articles - Google Patents

Abstract

554,833. Ammunition projectiles. PRESSED STEEL CO., Ltd., KELLEY, G. L., MATON, W. C., ROBERTSON, R., and MORPHEW, L. R. Jan. 15, 1942, No. 592. [Class 9 (i)] [Also in Group XXII] The end of a shell or bomb case or other hollow conical article is made by pressing or swaging a number of parts and then assembling and welding these parts together. A piece of 0.3 inch mild steel plate may be rolled into a cylinder 11 and welded and a 0.5 inch thick cylinder 12 may be made similarly and inserted in the first, surface contact all over being obtained by internal pressure if necessary. One or both cylinders, singly or jointly, may be upset and are, at the same time or later, swaged in a die to form a cone, Fig. 2. The cylinder 12 may have a scalloped edge 16, to increase the length of the weld 13. A machined ring 15 may be welded on to receive a nose cap or this may be screwed into the nose directly. In a modification the inner cone 21, Fig. 4, engages the outer cone 20 with its rear edge directly and its front edge is connected thereto by a bridging ring 23 welded at 24, 25 and 26. In other modifications a nest of shaped parts 29, 30, 31, 32, Fig. 8, successively smaller in size is used, the front edges being flanged inwardly or connected by a ring of triangular cross section or of rectangular cross section 43 if only the outer cone 29 is flanged at 42. The parts may also be connected by plug welds. In other modifications a single cone 45, Fig. 9, is strengthened by solid or hollow ribs 47. In another modification a cone is built up from similar segments 55, Figs. 12, 13, having tapering flanges 56 extending up to a machined ring 59. In another modification the segments 64, Fig. 17, are joggled at 65 so that when assembled they form a substantially double-walled cone, the spaces 67 between the walls being greater towards the front end. In another modification the body is built up from conical rings 71 ... 74, Fig. 22, of which the intermediate ones, 72, 73 are joggled at mid circumference 75, 76 so that when assembled they form a double-walled cone spaced as before. In other modifications a simple or flanged outer cone may be strengthened by a longitudinally corrugated inner cone, or by a channelled-section ring 99, Fig. 30. The holes 102 are for attaching a nose cap &c. The spaces 27, Fig. 4, and 67, Fig. 17, may be filled with cement, base metal &c. The cones may also be swaged from a drawn tube or directly from a flat blank, in one or more stages, and hot or cold. In this case the blank may be annealed between the stages.