GB1230389A - - Google Patents

Abstract

1,230,389. Making hollow-ware; stamping; spinning. FOGG & YOUNG ENG. Ltd. 7 Jan., 1970 [7 Oct., 1968], No. 47432/68. Headings B3A, B3J and B3Q. A press for forming a dished and flanged metal article, e.g. the bottom of a tank, from a circular blank comprises a bed 1 for supporting a fixed die 8, a workhead 3 supporting a carrier (10), Fig. 2 (not shown), for a movable dishing die (not shown) or a clamping die (9, Fig. 2), means 16 for moving a radius and flange forming die carrier (17, Fig. 2), and adjustable means 26 for rotatably supporting a circular blank in position for pressing. The main carrier (10) is driven by a dual-range ram 5 including a large piston and a small piston for fast approach which are supplied through a pressurized tank 4 by a pump 6. A plunger 11 guides the main carrier (10). The blank is rotatable on a slide 26 which is movable by a lead-screw 27 along a table 24 adjustable about a pivot 22 by an hydraulic jack 25. In a first operation the blank, which is marked with circular guide lines, is progressively dished, as shown in Fig. 1, and may be planished by increasing the stroke rate and decreasing the stroke. For the flanging operation (Fig. 2), the work is inverted and gripped between clamping dies (9, 28) as it is progressively radiused by a die 18 on a piston 16, the cylinder 15 of which is supported on a pair of hydraulic rams 20. The rams 5, 16 operate simultaneously or in sequence and the strokerate is 5-40 per minute. The cylinder 15 is lowered in stages after each rotation of the work. A pair of flanging rollers may be provided for use instead of the cylinder 15.