Title:
ELECTRICAL DISCHARGE MACHINING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2014/068701
Kind Code:
A1
Abstract:
The present invention is capable of improving machining accuracy and machining efficiency by providing a regular rest time during a cycle in which machining is considered to become unstable during machining performed by the self-oscillation of a capacitor discharge in which the inter-electrode capacitance of a capacitor is used. This electrical discharge machining apparatus is provided with: a power source; an inter-electrode space formed by an electrode and the workpiece; a current-limiting resistor connected between the power source and the inter-electrode space; a switching element for turning on and off the application of voltage from the power source to the inter-electrode space; an inductance element connected serially between the switching element and the inter-electrode space; and a control unit for controlling the switching element, the control unit causing the switching element to turn on and off according to a switching pattern having an on-pulse duration (ΔT on) such that during the on-pulse time the voltage of the inter-electrode space can reach the voltage of the power source, and a rest duration (ΔT off) that ranges from the duration (ΔT ic) of the discharge current flowing during discharge of the capacitor, to less than the self-oscillation cycle (ΔT so).
Inventors:
KIM IEYOUNG (JP)
HASHIMOTO TAKASHI (JP)
TAKADA TOMOAKI (JP)
NAKAGAWA TAKAYUKI (JP)
SASAKI YUTO (JP)
HASHIMOTO TAKASHI (JP)
TAKADA TOMOAKI (JP)
NAKAGAWA TAKAYUKI (JP)
SASAKI YUTO (JP)
Application Number:
PCT/JP2012/078163
Publication Date:
May 08, 2014
Filing Date:
October 31, 2012
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
KIM IEYOUNG (JP)
HASHIMOTO TAKASHI (JP)
TAKADA TOMOAKI (JP)
NAKAGAWA TAKAYUKI (JP)
SASAKI YUTO (JP)
KIM IEYOUNG (JP)
HASHIMOTO TAKASHI (JP)
TAKADA TOMOAKI (JP)
NAKAGAWA TAKAYUKI (JP)
SASAKI YUTO (JP)
International Classes:
B23H1/02
Foreign References:
| JPS57156128A | 1982-09-27 | |||
| JPH06143034A | 1994-05-24 | |||
| JPH04315521A | 1992-11-06 | |||
| JPH0379221A | 1991-04-04 | |||
| JPH0890342A | 1996-04-09 | |||
| JPS56146623A | 1981-11-14 | |||
| JPH0487722A | 1992-03-19 |
Attorney, Agent or Firm:
SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
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