Patent ID: 8474295

Claim:
A method of compacting the surface of a sintered part comprising: moving a sintered part in a die along an axis in a pressing direction through a plurality of die portions from a first die portion at a first die orifice into a last die portion, wherein a wall surface of each of the plurality of die portions forms at least one pressing surface against which a contact surface formed by an external surface of the sintered part is pressed, and an internal contour lying in a cross-section with respect to the axis and defined by the pressing surface corresponds at least approximately to an external contour defined by the contact surface; and as the sintered part is moved from the first die orifice to the last die portion, a surface compaction takes place due to die portions which merge continuously into one another and due to monotonously decreasing internal diameters of the die portions as measured between a plurality of co-operating pressing surfaces, wherein the sintered part is removed from the die through a second die orifice lying opposite the first die orifice.