Spark-eroding machine for making apertures in workpieces made of electrically conducting materials

Claim 1

A machine for spark-erosion cutting of complex shape apertures in workpieces constituted of current-conducting materials with a tool electrode, said machine comprising a coordinate table includinG two carriages displaceable in mutually perpendicular directions; means for holding the workpiece under processing rigidly fixed on one of said carriages of the coordinate table; a crank gear mounted on the second carriage of said coordinate table, said crank gear comprising two slides displaceable in two mutually perpendicular directions, said crank gear including a pin fixed to one of the said slides and a shaft parallel to said pin, the second slide having a base rigidly connected to the shaft of the said crank gear; a connecting arm set onto the pin and slidably connected to said second carriage and supporting said tool electrode; means for directing the tool electrode mounted on the connecting arm of said crank gear so that the said tool electrode and the said pin are coaxial; and controlling drives providing the desired parameters of the sparkerosion process and adapted for displacing said two carriages of the coordinate table and said two slides and said shaft of the crank gear so that the tool electrode and the workpiece being processed displace relative to one another along a trajectory representing a combination of straight lines, circumferences and circumferential arcs.