Device for indirect extrusion of a hollow section

Claim 1

Device for indirect extrusion of a hollow section having an extruded integral flange thereon that projects out beyond the side of the hollow section from a hollow billet which comprises: a die for extruding said billet, said die having a die face; a shape-giving orifice of said die which determines the outer contour of said section; a container movable with respect to said die enclosing the die; an extrusion ram and a single column-like mandrel projecting therefrom and operatively associated with said die and said orifice, said mandrel determines the inner contour of the hollow section and said extrusion ram having an extrusion ram face directed towards said die face; a shaping recess which determines the extruded integral flange provided immediately in front of said shape-giving orifice of the die with respect to the extrusion direction x, the radial dimension of said recess being greater than the width of the shape-giving orifice, wherein the recess is provided in the extrusion ram face running counter to the extrusion direction x and wherein the recess is formed by a ring-shaped collar and an insert defining the base of the recess and the shape of the flange.