The Cup Operation

The cup operation takes the flat metal disk produced in the blanking stage and performs the first diameter reduction on it. A hold-down sleeve applies pressure to the blank to prevent wrinkling, then the draw punch pushes down on the blank and forces it into the die. Finally, a knock-up pin ejects the cup, and the transfer slide takes it to the next operation. Because the resulting part is isolated, it can be moved to succeeding stations for deeper draws. To see this entire process, click on "NEXT ANIMATION" below.