Spark erosion machining process
AssigneeCegedur Societe de Transformation de l'Aluminum Pechiney
InventorGerard Izari
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Abstract
A process for the spark erosion machining of a workpiece having a cylindrical orifice, formed of any desired cross-section, the invention utilizes an electrode which is moved relative to the workpiece. According to the invention, a first rapid rough shaping pass is performed by descent of the electrode parallel to the generatrices of the orifice. On raising, the electrode is then translated perpendicularly to the generatrices by a distance r and then is lowered at a slower speed and is raised again before performing a circular translation of radius r. The electrode is again lowered and raised, and the operation is repeated n times so as to perform a complete revolution. The present process allows efficient machining of dies for metal extrusion.
Claims12
A process for the spark erosion machining of a workpiece having a cylindrical orifice of any given cross-section, the process being effected by means of a single electrode which is displaced relative to the workpiece, the process sequentially comprising the steps of:
- making a first rapid rough pass relative to the workpiece by causing the electrode to descent through the orifice parallel to the generatrices of the orifice to spark erode surfaces of the orifice;
- raising the electrode;
- translating the electrode perpendicularly to the generatrices by a distance r so that a point is located at P.sub.1 on the surfaces of the orifice;
- lowering the electrode into the rough orifice parallel to the generatrices;
- rasing the electrode;
- translating the electrode to a point located at P.sub.2 on the surfaces of the orifice;
- lowering the electrode parallel to the generatrices;
- raising the electrode;
- and
- repeating the translation, lowering, and raising steps n times until the translation has made a complete revolution.
Dependencies are inferred from the claim text.