Taper shell punch and drawing die set - presses ridged angular rim around end of drawn can

摘要

The sliding sleeve supports a tapered shell during drawing. Thin metal sheet is blanked, then drawn between the hollow descending punch and the downwardly retracting sleeve. Three-line annular contact finally swages the shell end rim smooth, for food can closure. The initially flat blank (19) is punched (26) against a sprung backing ring (28) within a die. The shell forms over a fixed tapered (9) centre post (5). The sheet is swept by two punch shoulders (11, 12) and a sprung sleeve (4) end shoulder (6) between the two opposite shoulders. The hollow tapered (8) punch, ring and axially independent sleeve, descend to a stop (30).