| 20090301154 | METHOD AND APPARATUS FOR SHAPING A RIM OF A THREE-DIMENSIONALLY ARCHED SHEET METAL - Method for shaping a rim of a three dimensionally arched sheet metal, wherein the sheet metal is placed on a female die provided with a chamfer which follows the contour of a peripheral edge of the rim, the rim spanning the chamfer, and a male roller die is rolled on the sheet metal following the course of the chamfer while being pressed against the rim, thereby plastically deforming the rim locally into the chamfer while advancing along the chamfer in rolling contact. | 12-10-2009 |
