Patent ID: 8181498
Filing Date: 2012-05-22
Classification: B21D,Y10S

Abstract:
1. A method for shaping a rim of a three dimensionally arched sheet metal comprising: positioning the sheet metal 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 rolling a male roller die 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, wherein the rim comprises an inner rim zone spanning the chamfer and a peripheral rim zone which includes the peripheral edge and protrudes beyond the chamfer, and, after having deformed the inner rim zone into the chamfer, the outer rim zone is bent back towards the deformed inner rim zone, wherein a back-up roller is rolled along the peripheral rim zone pressed against the peripheral rim zone towards the male roller die, thereby backing up the peripheral rim zone, while the male roller die is pressed in rolling contact against the inner rim zone and the peripheral rim zone is backed-up by the back-up roller and thereafter bent back towards the deformed inner rim zone.