Patent ID: 8157494
Filing Date: 2012-04-17
Classification: B21D,B23K

Abstract:
1. A pre-rounding element or a rounding element in a rounding apparatus, comprising: a substantially rigid upper element part which is formed to be attached at the rounding apparatus by means of attachment members, or which is formed by an apparatus-fixed part of the rounding apparatus, a lower element part designed for acting upon the metal sheets to be rounded, which are located in the rounding apparatus, a joint arrangement by means of which the lower element part is connected to the upper element part in an articulated way, and an actuating element by means of which the lower element part is deflectable in such a way that metal sheets to be rounded can be actuated differently by the lower element part, wherein the joint arrangement has a solid body joint which connects the upper element part and the lower element part in a substantially continuous way and which has areas along a longitudinal elongation of the solid body joint with different section moduli in bending for the deflection movement, wherein at least one of the section modulus in bending of the solid body joint or a material thickness of the solid body joint has its highest value in the area where the actuating element introduces a force which acts on the lower element part, and wherein the longitudinal elongation of the solid body joint is substantially transverse to the direction of the deflection movement.