# US 2013/0153409 A1 · Installation for breaking an edge on a metal piece > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0153409 A1 - Document ID: US20130153409A1 - Status: Published application - Kind: A1 - Application number: 13/819,796 - Filed: 2011-09-02 - Published: 2013-06-20 - Earliest claimed: 2010-09-02 - Assignees: Snecma - Inventors: Nicolas Batista; Damien Hebuterne; Anthony Texier - Web page: https://patentgrep.com/patent/US20130153409A1 ## CPC - B23H 9/02: Trimming or deburring {(B23H9/003 takes precedence)} - B23H 3/00: Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte - B23H: WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL (processes for the electrolytic or electrophoretic production of coatings, electroforming, or apparatus therefor C25D; processes for the electrolytic removal of material from objects C25F; manufacturing printed circuits using precipitation techniques to apply the conductive material to form the desired conductive pattern H05K3/18) ## Abstract An electrode for breaking an edge of a part by electrochemical machining, the electrode including at least one conductive zone configured to be arranged facing an edge of the part that is to be broken. The conductive zone is of a shape that is complementary to the shape of the broken edge to be produced and is arranged between a first portion forming an insulating extra thickness and an insulating second portion for positioning the conductive zone so that it faces the edge to be broken. ## Claims ### Claim at position 1 1-14. (canceled) ### Claim 15 An electrode for breaking an edge of a metal part by electrochemical machining, the electrode comprising: at least one conductive zone configured to be arranged facing an edge of the part that is to be broken; the conductive zone is of a shape that is complementary to a shape of the broken edge to be produced and is arranged between a first portion forming an insulating extra thickness and an insulating second portion for positioning the conductive zone so that the conductive zone faces the edge to be broken. ### Claim 16 (depends on 15) An electrode according to claim 15, wherein the conductive zone of the electrode has a concave curved section. ### Claim 17 (depends on 15) An electrode according to claim 15, wherein the insulating first portion is annular in shape. ### Claim 18 (depends on 15) An electrode according to claim 15, wherein the conductive zone of the electrode has a concave curved annular shape and extends between the insulating extra thickness and the insulating second portion that is of cylindrical shape. ### Claim 19 (depends on 15) An electrode according to claim 15, comprising two concave curved zones extending in rectilinear and mutually parallel manner, concave sides of the curved zones facing in opposite directions along a common axis. ### Claim 20 (depends on 19) An electrode according to claim 19, wherein each conductive zone is formed at a junction between the insulating first portion and a dovetailed flank of the insulating second portion. ### Claim 21 (depends on 15) An installation for breaking an edge on a metal part, the installation comprising: a vessel for receiving a part and configured to be filled with an electrolytic solution so as to immerse at least an edge that is to be machined; and support and positioning means for supporting the electrode according to claim 15 and for positioning the conductive zone of the electrode in immersion facing the edge to be broken and at a determined distance from the edge, so as to break the edge by electrochemical machining. ### Claim 22 (depends on 21) An installation according to claim 21, wherein the support and positioning means comprises a gantry movable in three mutually perpendicular directions relative to the vessel. ### Claim 23 (depends on 21) An installation according to claim 21, wherein the gantry includes non-destructive testing means for inspecting the edge broken on the part. ### Claim 24 (depends on 23) An installation according to claim 23, wherein the non-destructive testing means comprises optical testing means comprising a generator emitting a laser beam directly towards the machined zone of the part and a camera for imaging the machined zone, the camera being connected to information processor means for interpreting images taken by the camera. ### Claim 25 (depends on 21) An installation according to claim 21, wherein the conductive zone of the electrode is made of graphite. ### Claim 26 (depends on 21) An installation according to claim 21, wherein the insulating portions of the electrode are made of polymer resin. ### Claim 27 (depends on 21) An installation according to claim 21, wherein the conductive zone of the electrode is fed with direct current at a current density in a range 10 A/cm2 to 100 A/cm2, or in a range 50 A/cm2 to 60 A/cm2. ### Claim 28 (depends on 21) An installation according to claim 21, wherein the part is mounted on a support that is movable vertically, or is movable vertically by cylinders, relative to the vessel containing the electrolytic solution.