Method for forming a moulding and moulding

A method for forming a moulding from a light metal or a light metal alloy by extrusion of a slug carried out along a press axis, wherein in at least one area the moulding is formed with a deviation from a rotationally symmetrical basic form with reference to the press axis, this symmetrically deviating area extends over a wall section of the moulding formed by indirect cup extrusion, with normal vector running predominantly orthogonally to the press axis, and in the same extrusion process a structure surrounding, particularly running round the press axis is formed by direct cup extrusion, direct hollow extrusion or direct solid extrusion on an extensive base of the moulding adjacent to the wall section, with normal vector running predominantly in the direction of the press axis, on its side opposite the wall section, in which in an area of smallest wall thickness of the wall section at the transition to the base the quotient from this wall thickness in [mm] and an average curvature in [mm-1] formed at the transition is greater than 0.03, preferably greater than 0.1, more preferably greater than 0.3, particularly greater than 0.6 and/or, seen in the circumferential direction, in an at least predominant area of the base-wall transition the ratio of wall thickness to base thickness is less than 1.0, preferably less than 0.85, particularly less than 0.7.