Abstract A method of forming an aperture in an electrically conductive workpiece by a spark-eroding technique, comprises rotating an electrode tool while simultaneously the work displacing the same axially along its axis of rotation towards the workpiece to bring a working portion of the tool into proximity with the workpiece to form an aperture in the workpiece while concurrently introducing an additional electrode tool between the workpiece and the first electrode tool at an end face thereof, to produce a desired shape for the working portion of the first electrode tool. The additional electrode tool can be displaced longitudinally thereof, to compensate for wear of the additional electrode in the course of formation of the working portion of the first tool. Also the additional electrode can be displaced transversely to vary the diameter of the working portion of the first tool and thereby vary the diameter of the aperture which is formed in the workpiece.
A method of forming an aperture in an electrically conductive workpiece by a spark-eroding technique with the use of an electrode tool, said method comprising the steps of rotating the electrode tool while simultaneously displacing the same axially along its axis of rotation towards the workpiece to bring a working portion of the tool into proximity with the workpiece to form an aperture in the workpiece, and concurrently introducing an additional electrode tool between said workpiece and the first-mentioned electrode tool at an end face thereof to produce a desired shape for the working portion of said first-mentioned electrode tool concurrently with the formation of said aperture.
Claim 2
Independent Claim
107 words
A method of forming an aperture in an electrically conductive workpiece by a spark-eroding technique with the use of an electrode tool, said method comprising the steps of rotating the electrode tool while simultaneously displacing the same axially along its axis of rotation towards the workpiece to bring a working portion of the tool into proximity with the workpiece to form an aperture in the workpiece, and concurrently introducing an additional electrode tool between said workpiece and the first-mentioned electrode tool at an end face thereof to produce a desired shape for the working portion of said first-mentioned electrode tool concurrently with the formation of said aperture.
Claim 3
Dependent Claim
46 words
A method as claimed in claim 1, comprising displacing said additional electrode tool longitudinally thereof in relation to said first-mentioned electrode tool and simultaneously with the movement of the first-mentioned tool to compensate for wearing away of said additional electrode tool in the course of operation.
Claim 4
Dependent Claim
44 words
A method as claimed in claim 1 comprising displacing said additional electrode tool transversely thereof in relation to said first-mentioned electrode tool to vary the diameter of the working portion which is produced and thereby the diameter of the aperture formed in the workpiece.