Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1986-06-10
1987-09-01
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204212, 204224M, 204225, 204280, 204272, B23H 310, B23H 730, B23H 736
Patent
active
046907378
ABSTRACT:
A method and apparatus for electrochemical rifling of gun barrels and the like is disclosed. In one embodiment of the apparatus, an elongate pressure chamber for receiving electrolyte fluid under pressure is mounted in alignment with an anode gun barrel and in fluid communication therewith. A cathode rod rifling assembly is mounted in the pressure chamber in axial alignment with the gun barrel. Drive means simultaneously rotates the rifling assembly and moves it relative to the barrel for passage of the rifling assembly through the barrel along with the electrolyte fluid. In another embodiment, the rifling asembly comprises first and second adjacent segments joined on a plane. Each segment has peripheral, radially outwardly extending, circumferentially spaced strips of insulation which are out of alignment with, and overlap, one another along the plane. The overlapped regions define the width of the unetched portions or lands on the barrel. In still another embodiment, an elongate cylindrical cam member having a cam groove on the periphery thereof is mounted within a gun barrel in coaxial relation. A cathode rod rifling assembly is slidably mounted on the cam member between the barrel and cam member. The rifling assembly comprises a plurality of annular segments, each having peripheral, circumferentially spaced, radially outwardly extending strips of insulation and a radially depending lug extending through a slot in the rifling assembly and into the groove on the cam member.
REFERENCES:
patent: 1927162 (1933-09-01), Fiedler et al.
patent: 2848401 (1958-08-01), Hartley
patent: 3429798 (1969-02-01), Beck et al.
patent: 3769194 (1973-10-01), Haggerty
patent: 4227986 (1980-10-01), Loqvist et al.
Cation Corporation
Valentine Donald R.
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