# US 4,394,243 A · Electrode for an electrochemical metal machine process > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,394,243 A - Document ID: US4394243A - Status: Granted - Kind: A - Application number: 06/188,742 - Filed: 1980-09-19 - Granted: 1983-07-19 - Earliest claimed: 1979-09-22 - Assignees: Daimler-Benz Aktiengesellschaft - Inventors: Gerhard Hoffmann - Web page: https://patentgrep.com/patent/US4394243A ## CPC - B23H 9/003: {Making screw-threads or gears} - 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 an electrochemical metal removing process, with the electrode consisting of a metal sheet extending at right angles to a sinking direction of the electrode. To enable the production of end face contours the metal sheet is provided with perforations which extend laterally beyond an edge of the workpiece being processed. A resiliently mounted plate of an insulating material may be provided for covering a rear side of the perforations. ## Claims ### Claim 1 An electrode for an electrochemical metal-removing process for a workpiece having an edge, characterized in that the electrode is formed of a metal sheet which extends at right angles to a direction of sinking of the electrode in the metal removing process, the metal sheet is provided with perforations adapted to extend laterally beyond a line defined by said edge to be processed so as to enable the production of end-faced contours, means disposed against the metal sheet on the side thereof leading in the direction of sinking for insulating a surface coextensive with said perforations to prevent electrochemical metal removal therefrom. ### Claim 2 An electrode for an electrochemical metal-removing process for a workpiece having an edge, characterized in that the electrode is formed of a metal sheet which extends at right angles to a direction of sinking of the electrode in the metal-removing process, an electrode holder is provided which includes a base plate for accommodating the electrode, and in that inner and outer clamping members are provided for fastening the electrodes to the electrode holder, and means disposed against the metal sheet on the side thereof leading in the direction of sinking for insulating a surface coextensive with said perforations to prevent electrochemical metal removal therefrom. ### Claim 3 An electrode for an electrochemical metal-removing process, characterized in that the electrode is formed of a metal sheet which extends at right angles to a direction of sinking of the electrode in the metal-removing process, an electrode holder is provided with includes a base plate for accommodating the electrode, inner and outer clamping members are provided for fastening the electrodes to the electrode holder, and in that the base plate is provided with conically turned portions for ensuring a clamping of the electrode in place. ### Claim 4 An electrode for an electrochemical metal-removing process for a workpiece having an edge, characterized in that the electrode is formed of a metal sheet which extends at right angles to a direction of sinking of the electrode in the metal-removing process, and in that the metal sheet has a thickness of 0.1-0.5 mm, and means disposed against the metal sheet on the side thereof leading in the direction of sinking for insulating a surface coextensive with said perforations to prevent electrochemical metal removal therefrom. ### Claim 5 An apparatus for an electrochemical metal-removing process for a workpiece having an edge comprising: means for producing in the workpiece end-faced contours, the surfaces of the contours being perpendicular to a predetermined plane comprising an electrode formed of a metal sheet extending in said plane perpendicular to a direction of sinking of the electrode during the metal removing process, the metal sheet is provided with perforations extending laterally adjacent a line defined by said edge processed, and means disposed aginst the metal sheet on the side thereof leading in the direction of sinking for insulating a surface coextensive with said perforations to prevent electrochemical metal removal therefrom. ### Claim 6 A cathode for an electrochemical metal removing process consisting of a sheet which extends perpendicular to the direction of sinking, characterized by the fact that the sheet for manufacturing workpiece end contours is equipped with penetrations which are covered in the rear with a spring-mounted plate of insulating material. ### Claim 7 (depends on 6) A cathode in accordance with claim 6, characterized by the fact that the penetrations extend sideways over the workpiece. ### Claim 8 An apparatus for an electrochemical metal-removing process for a workpiece having an edge comprising: means for producing in the workpiece end-faced contours, the surfaces of the contours being perpendicular to a predetermined plane comprising an electrode formed of a metal sheet extending in said plane perpendicular to a direction of sinking of the electrode during the metal removing process, wherein the metal sheet is provided with perforations extending beyond a line defined by said edge processed in a direction perpendicular to the direction of sinking, and means for insulating a surface coextensive with said perforations to prevent electrochemical metal-removal therefrom. ### Claim 9 (depends on 8) An apparatus as set forth in claim 8, wherein said means for insulating is urged against said surface parallel to the predetermined plane.