GB1113048A - Method and apparatus for making pipe fittings - Google Patents

Abstract

1,113,048. Making valves and pipe fittings; forging. A. C. ARBOGAST. 8 Oct., 1965, No. 42765/65. Headings B3A and B3H. A thin wall branch pipe fitting or a valve body is made by confining a solid cold workpiece of ductile material, such as copper, between split dies 28, (30), Fig. 6 (not shown), having a T- shaped recess 38, 40, 42, Fig. 5, and pressing the workpiece by punches 44, 46, 52 to form the fitting with interconnecting webs 70, 72 which are later removed. The upper and lower dies 28, (30) are opened and closed by a doubleacting hydraulic motor (34), Fig. 1 (not shown), and the punches 44, 46, 52 are also actuated by double-acting hydraulic motors (48), (50), (54). In operation, a solid slug of copper (64), Fig. 2 (not shown), is placed in the through cavity between the open dies 28, (30) which are then closed. Branch punch 52 which has a concave end (55), Fig. 6 (not shown), is simultaneously or subsequently advanced into the side bore 42 and held therein by a power-actuated latch (60), Fig. 11 (not shown). The opposed punches 44, 46 are then moved inwardly in synchronism whereby their reduced ends 45, 47 pierce and extrude the copper into the T-shaped fitting. Alternatively one of the opposed punches may be moved initially into its inner position and the other punch only. is then moved to shape the workpiece. The punches may be moved with impact. Subsequently the webs 70, 72 are removed by drilling or punching and the ends of the fitting are squared. The T-shaped branch may have plain or enlarged ends, Figs. 3, 4 (not shown). Another embodiment is described, Figs. 8-10 (not shown), for making a gate valve body.