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|1. (WO2018087986) TENSION-CONTROLLING METHOD AND ELECTRIC DISCHARGE MACHINING APPARATUS|
|Applicants:||SEIBU ELECTRIC & MACHINERY CO.,LTD.
|Title:||TENSION-CONTROLLING METHOD AND ELECTRIC DISCHARGE MACHINING APPARATUS|
Provided are a tension-controlling method, etc. suitable for appropriately controlling the tension of a wire electrode wire and achieving high precision machining comparable to control that uses a tension detector and feedback control thereof. An electric discharge machining apparatus 1 is provided with a correspondence storage part 27 for storing the correspondence between the tension in a wire electrode wire between a feed roller 7 and a winding roller 13 and the difference in driving rates of a feed motor 15 and a winding motor 17. A set point storage part 29 stores the feed rate set point for the wire electrode wire and the tension set point set by a user. A determination part 31 determines the difference in driving rates of the feed motor 15 and the winding motor 17, etc. from the tension set point, etc. by referring to the correspondence storage part 27. A motor control part 23 controls the feed motor 15 and the winding motor 17 using the feed rate set point and the difference in driving rates, etc. determined by the determination part 31.