Seibu Electric Machinery Co., Ltd.

Keisuke Tasaki

Takashi Mitsuyasu

Masatoshi Kawano

An electrical discharge machining device provided, using a floating capacitance to provide a machining target with improved surface roughness. An electrical discharge machining device 1 includes a current supply circuit 3 that supplies a current to a gap between an electrode 17 and a machining target 19 so as to provide electrical discharge machining. A floating capacitance portion 21 occurs between the electrode 17 and the machining target 19 in the electrical discharge machining. The floating capacitance portion 21 supplies its stored charge to the gap in the electrical discharge machining. A capacitor 11 stores a charge before the floating capacitance portion 21 is discharged. After the floating capacitance portion is discharged, the capacitor 11 charges the floating capacitance portion 21. The floating capacitance portion 21 is discharged again after it is charged. Such an operation generates a pulse current, thereby providing electrical discharge machining.

Electrical discharge machining device, electrical discharge machining method, and design method

An electrical discharge machining device is provided, using a floating capacitance to provide a machining target with improved surface roughness. An electrical discharge machining deviceincludes a current supply circuitthat supplies a current to a gap between an electrodeand a machining targetso as to provide electrical discharge machining. A floating capacitance portionoccurs between the electrodeand the machining targetin the electrical discharge machining. The floating capacitance portionsupplies its stored charge to the gap in the electrical discharge machining. A capacitorstores a charge before the floating capacitance portionis discharged. After the floating capacitance portion is discharged, the capacitorcharges the floating capacitance portion. The floating capacitance portionis discharged again after it is charged. Such an operation generates a pulse current, thereby providing electrical discharge machining.

In a method of welding a cut-out part with a workpiece at a preselected area in a thickness direction of the workpiece in a wire electrical discharge machining to retain temporarily or tentatively the part on the workpiece, a wire electrodetilted in posture cuts the workpieceto form a slant cutting surfaceat a spark discharge location in a desired contourin the workpiece. The wire electrodeafter kept in an upright posture executes the welding process on the workpiecealong the slant cutting surface. A plurality of the welded spots is formed over a preselected length at preselected areas in the thickness direction of the workpiece. Even if the cut-out partweighs more or the spark discharge is executed on the workpieceoverlapped one on the other, the welding spotis formed in the thickness direction of the workpieceadequately depending on the working situation to tentatively retain the cut-out parton the workpiece

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Fukuoka, Japan

Keisuke Tasaki