PHYSICAL PRINCIPLES OF ELECTRIC-SPARK METAL-WORKING
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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The electric-spark method of working metals, based on the use of the phenomena accompanying the pulsed liberation of electrical energy in a discharge gap, makes it possible to work any electrically conducting material regardless of its physicochemical properties hardness, viscosity, melting point, chemical composition, etc. without using an instrument made of harder material. The working electrode is usually made of brass, cast or uncast iron, graphite, or aluminum. No cutting instrument cutters, drills, milling cutters, broaches, abrasives, etc. is required. The process is applicable to such operations as the cutting of metals, making holes of any shape and dimensions, grinding, applying coatings, changing the structure of the surface, making non-circular openings with curvilinear axes, and making objects with a wall thickness of several tens of microns.
- Fabrication Metallurgy