| 摘要 |
An aerosol can end dome (D) is initially formed followed by formation of a crown (C). A workpiece periphery is initially clamped between a blank punch (136) and a draw pad (150), and also between a knockout (118) and a crown ring (152). A dome outer portion (D1) is formed between an outer redraw sleeve (122) and a dome form die (160) followed by formation of a dome inner portion (D2) between a dome punch (114) and the dome form die (160). Limited contact between the dome punch (114) and the workpiece (W) may occur during formation of the dome (D) outer portion (D1). The workpiece (W) may also be clamped between the outer redraw sleeve (122) and the dome form die (160) during dome (D) inner portion (D2) formation. Controlled clamping between: blank punch (136)/draw pad (15); knockout (118)/crown ring (152); and, outer redraw sleeve (122)/dome form die (160), control material flow to substantially eliminate radial wrinkles commo with prior art formation using sheet material thinner than conventional, e.g., double reduced steel. |
