Abstract: A discharge-generation control unit applies at least a preliminary-discharge voltage pulse and a main-discharge voltage pulse between a wire electrode and a work. A discharge-position determining unit determines a discharge position from results of measurement by a plurality of current measuring units. A machining-energy adjusting unit adjusts machining energy generated by the main-discharge voltage pulse based on a discharge position determined before applying the main-discharge voltage pulse, and reflects a result of the adjustment on the generation of an electric discharge by feeding the result to the discharge-generation control unit.

Abstract: A discharge-generation control unit applies at least a preliminary-discharge voltage pulse and a main-discharge voltage pulse between a wire electrode and a work. A discharge-position determining unit determines a discharge position from results of measurement by a plurality of current measuring units. A machining-energy adjusting unit adjusts machining energy generated by the main-discharge voltage pulse based on a discharge position determined before applying the main-discharge voltage pulse, and reflects a result of the adjustment on the generation of an electric discharge by feeding the result to the discharge-generation control unit.

Abstract: A wire electrical discharge machine in which a profile directing unit controls a profile of a portion in the neighborhood of an approach point, which connects an approach path portion with a machining profile portion of the relative movement path of the wire electrode and workpiece on a machined face of the workpiece. A profile of a portion in the neighborhood of the approach point on the machined face of the workpieces can be adjusted to a desired profile according to the use of the workpiece.

Abstract: A wire electrical discharge machining apparatus for discharge-machining a work (1) by relatively moving a wire electrode (5) and the work (1) by drive means (10) and by feeding a machining energy to the space between the wire electrode (5) and the work (1) by machining power feeding means (11). The wire electrical discharge machining apparatus comprises shape specifying means (15) for specifying, depending on the use of the work (1), the shape of a portion in the vicinity of an approach point (O) at which an approach path portion (4) of a relative movement path of the relative movement between the wire electrode (5) on the face to be machined of the work (1) and the work (1) and a machining shape portion (2) are connected, into a convex or concave shape to a desired degree, and adjusting means (16) for adjusting the shape of the portion in the vicinity of the approach point (O) on the basis of the specified value by the shape specifying means (15).