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1. (WO2017157556) METHOD FOR PRODUCING GUN BARRELS AND APPARATUS FOR PERFORMING SUCH METHOD

Pub. No.:    WO/2017/157556    International Application No.:    PCT/EP2017/051773
Publication Date: Fri Sep 22 01:59:59 CEST 2017 International Filing Date: Sat Jan 28 00:59:59 CET 2017
IPC: F41A 21/16
F41A 21/18
B21C 37/15
Applicants: REPKON MACHINE AND TOOL INDUSTRY AND TRADE INC.
Inventors: ARAN, Ayet Azer
Title: METHOD FOR PRODUCING GUN BARRELS AND APPARATUS FOR PERFORMING SUCH METHOD
Abstract:
The invention relates to a method and an apparatus for producing gun barrels having a grooved or ribbed inner surface (110) with straight or helical grooves (111) or ribs. The method comprises: providing a metallic hollow cylindrical pre- form (10}; placing the pre-form (10) on a core mandrel (8) being part of a flow forming machine having a main machine axis (A), the core mandrel (8) being not driven and being freely rotatable about the main axis (A) and having a structured outer surface (80) comprising ribs (111) and/or grooves, the ribs (111) and/or grooves extending straightly parallel to and/or helically around the main axis (A); and applying forming rollers (90) comprised in a roller arrangement (9), to the outside surface of the pre-form (10) so as to apply radial (PI) pressure on the pre-form (10) such that its material begins to flow. As the rollers (90) apply force upon the pre-form (10), a relative motion between the pre-form (10) and the rollers (90) is performed by either moving the pre-form (10) in axial direction (X) parallel to the main axis (A) through the roller arrangement (9) or by moving the roller arrangement (9) alongside the pre-form (10).