Abstract: Methods and apparatuses are described herein for producing a rifling in a barrel of a gun. The barrel defines an axis in a longitudinal direction and comprises an inner wall that defines a bore extending in the longitudinal direction. A tool includes a tool head having an outer contour that corresponds to a shape of the rifling to be produced. The tool head consists of an electrically conductive material. The outer contour of the tool head and the inner wall of the barrel define a gap. An electrolyte solution is pumped through the gap while the tool is guided through the bore, and a pulsed electrical voltage is applied to the barrel and the tool. The barrel is the anode and the tool head is the cathode. The tool is moved through the bore and rotated about the longitudinal axis while the pulsed voltage is applied to produce the riflings.

Abstract: The present invention concerns a method for producing riflings in barrels of guns including a barrel 6 as a workpiece 6 which defines an axis A in its longitudinal direction and which has a bore lying in the longitudinal direction which defines an inner wall of the barrel and a tool 8 comprising a tool head 10, which has an outer contour corresponding to the shape of the riflings to be produced, consisting of an electrically conductive material, wherein an electrolyte solution is pumped through the bore of the barrel 6, while the tool 8 is guided through the bore of the barrel 6, wherein a pulsed electrical voltage is applied to workpiece 6 and tool 8, with which a direct current is generated, the workpiece 6 being the anode and the tool head 10 being the cathode, the barrel 6 being positioned vertically with its longitudinal direction, wherein between the electrically conductive outer contour of the tool head 10 and the inner wall of the barrel 6 there is a gap surrounding the tool head 10, through which the