| B | SK | SECTION B — PERFORMING OPERATIONS; TRANSPORTING |
| B23 | KL | MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR (punching, perforating, making articles by processing sheet metal, tubes, or profiles B21D; wire-working B21F; making pins, needles, or nails B21G; making chains B21L; grinding B24) |
| B23H | UKL | 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 H05K 3/18) [4] |
| B23H 1/00 | HGR | Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric [4] |
| B23H 1/02 | UGR1 | | . | Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges [4] |
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| B23H 1/04 | UGR1 | | . | Electrodes specially adapted therefor or their manufacture (B23H 9/00 takes precedence) [4] |
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| B23H 1/06 | UGR2 | | . . | Electrode material [4] |
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| B23H 1/08 | UGR1 | |
| B23H 1/10 | UGR1 | | . | Supply or regeneration of working media [4] |
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| B23H 3/00 | HGR | Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte [4] |
| B23H 3/02 | UGR1 | | . | Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits [4] |
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| B23H 3/04 | UGR1 | | . | Electrodes specially adapted therefor or their manufacture (B23H 9/00 takes precedence) [4] |
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| B23H 3/06 | UGR2 | | . . | Electrode material [4] |
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| B23H 3/08 | UGR1 | |
| B23H 3/10 | UGR1 | | . | Supply or regeneration of working media [4] |
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| B23H 5/00 | HGR | Combined machining [4] |
| B23H 5/02 | UGR1 | | . | Electrical discharge machining combined with electrochemical machining [4] |
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| B23H 5/04 | UGR1 | | . | Electrical discharge machining combined with mechanical working [4] |
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| B23H 5/06 | UGR1 | | . | Electrochemical machining combined with mechanical working, e.g. grinding or honing [4] |
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| B23H 5/08 | UGR2 | | . . | Electrolytic grinding [4] |
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| B23H 5/10 | UGR1 | | . | Electrodes specially adapted therefor or their manufacture (B23H 1/04, B23H 3/04 take precedence) [4] |
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| B23H 5/12 | UGR1 | |
| B23H 5/14 | UGR1 | | . | Supply or regeneration of working media [4] |
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| B23H 7/00 | HGR | Processes or apparatus applicable to both electrical discharge machining and electrochemical machining [4] |
| B23H 7/02 | UGR1 | |
| B23H 7/04 | UGR2 | | . . | Apparatus for supplying current to working gap; Electric circuits specially adapted therefor [4] |
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| B23H 7/06 | UGR2 | | . . | Control of the travel curve of the relative movement between electrode and workpiece [4] |
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| B23H 7/08 | UGR2 | |
| B23H 7/10 | UGR3 | | . . . | Supporting, winding or electrical connection of wire-electrode [4] |
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| B23H 7/12 | UGR1 | | . | Rotating-disc electrodes [4] |
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| B23H 7/14 | UGR1 | | . | Electric circuits specially adapted therefor, e.g. power supply [4] |
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| B23H 7/16 | UGR2 | | . . | for preventing short circuits or other abnormal discharges [4] |
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| B23H 7/18 | UGR2 | | . . | for maintaining or controlling the desired spacing between electrode and workpiece [4] |
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| B23H 7/20 | UGR2 | | . . | for programme-control, e.g. adaptive [4] |
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| B23H 7/22 | UGR1 | |
| B23H 7/24 | UGR2 | | . . | Electrode material [4] |
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| B23H 7/26 | UGR1 | | . | Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode [4] |
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| B23H 7/28 | UGR2 | | . . | Moving electrode in a plane normal to the feed direction, e.g. orbiting [4] |
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| B23H 7/30 | UGR2 | | . . | Moving electrode in the feed direction (B23H 7/32 takes precedence) [4] |
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| B23H 7/32 | UGR2 | | . . | Maintaining desired spacing between electrode and workpiece [4] |
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| B23H 7/34 | UGR1 | |
| B23H 7/36 | UGR1 | | . | Supply or regeneration of working media [4] |
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| B23H 7/38 | UGR1 | | . | Influencing metal working by using specially adapted means not directly involved in the removal of metal, e.g. ultrasonic waves, magnetic fields or laser irradiation [4] |
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| B23H 9/00 | HGR | Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects (heat treatment by cathodic discharge C21D 1/38) [4] |
| B23H 9/02 | UGR1 | | . | Trimming or deburring [4] |
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| B23H 9/04 | UGR1 | | . | Treating surfaces of rolls [4] |
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| B23H 9/06 | UGR1 | | . | Marking or engraving [4] |
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| B23H 9/08 | UGR1 | |
| B23H 9/10 | UGR1 | | . | Working turbine blades or nozzles [4] |
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| B23H 9/12 | UGR1 | | . | Forming parts of complementary shape, e.g. punch-and-die [4] |
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| B23H 9/14 | UGR1 | |
| B23H 9/16 | UGR2 | | . . | using an electrolytic jet [4] |
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| B23H 9/18 | UGR1 | | . | Producing external conical surfaces or spikes (B23H 9/08 takes precedence) [4] |
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| B23H 11/00 | HGR | Auxiliary apparatus or details, not otherwise provided for [4] |