Patent ID: 9545660
Date: 2017-01-17
CPC Classifications: B21K

Claim:
1. A method for producing a formed part furnished with a through hole, comprising the steps of: a) advancing a rod material by a defined length in the direction along a longitudinal axis of a lengthwise extension of the rod material into a forming die, wherein an inner circumferential wall of the forming die defines an outer circumference of the formed part to be produced, wherein the rod material is advanced through a stationary guide having the same cross sectional shape as the rod material, b) axially immobilising the rod material, c) axially penetrating and impact extruding the portion of the rod material that is inside the forming die by at least one dishing tool, wherein the displaced material flows between the at least one dishing tool and the inner circumferential wall of the forming die to produce the formed part and to form a strong frictional connection between the forming die and the formed part and between the formed part and the dishing tool, thereby immobilising the formed part by a friction lock between the forming die and the formed part and between the formed part and the dishing tool, d) separating the formed part from the rest of the rod material, wherein the formed part located inside and secured within the forming die is rotated about the longitudinal axis coaxially relative to the rest of the rod material together with the forming die and the at least one dishing tool, the formed part thus being separated from the rest of the rod material, and e) transporting the formed part away.