| 摘要 |
<p>This invention relates to a method that can manufacture drawn/ironed cans whose surface roughness is improved on the final can body, body breakage in the ironing process is prevented, and in addition, neck-in processability and flange processability are improved in the process to perform the drawing/ironing processing when drawn/ironed cans are manufactured, by restricting the increase of thickness of B to not more than 20 % of A and the increase of thickness of C to not more than 30 % of A respectively, provided th% of A respectively, provided that the thickness of blank plate is A and the maximum thickness of the side wall part of formed body in a cup shape obtainable by a first stage drawing processing is B, and the maximum thickness of the side wall part of formed body in a cup shape obtainable by a second stage redrawing processing is C, and the ironing processing is applied after that, and setting the thickness deduction rate of the side wall part of drawn/ironed cans obtainable to be: (B - D)/B x 100 </= 70 % (C - D)/C x 100 </= 70 % provided that the final thickness of the side wall part of drawn/ironed cans finally obtainable is D.</p> |
