Yuji Findlay Kaneko

US Patent:

6423920, Jul 23, 2002

Filed:

Feb 1, 2001

Appl. No.:

09/762062

Inventors:

Yuji Kaneko - San Jose CA
Daisuke Sadsmitsu - Kanagawa, JP
Zhanbo Gu - Kanagawa, JP

Assignee:

Sodick Co., Ltd. - Kanagawa

International Classification:

B23H 102

US Classification:

219 6918, 219 6913

Abstract:

A power supply ( ) and a method for electric discharge machining by repeatedly providing a current pulse to a working gap ( ) formed between a tool electrode ( ) and a workpiece ( ) includes a d. c. power source (E), first switching elements (Tr -Trn) connected between the d. c. power source and the working gap, capacitors (C -C ) connected in parallel with the working gap, second switching elements ( ) for controlling current flow from the capacitor to the working gap, a detector ( ) for detecting start of an electric discharge, and a controller ( ) for controlling the first switching elements and the second switching elements in response to the detector. Current is supplied from the d. c. power source through the first switching elements to the working gap only for a first time interval ( ON) starting from the commencement of electric discharge, and a current is supplied from the capacitor through the second switching elements to the working gap for only a second time interval (T) is shorter than the first time interval, starting from the commencement of an electric discharge.

US Patent:

6979795, Dec 27, 2005

Filed:

Mar 18, 2005

Appl. No.:

11/082969

Inventors:

Yuji Kaneko - San Jose CA, US
Koji Yoneda - San Jose CA, US

Assignee:

Sodick Co., Ltd. - Yokohama
Sodick America Corporation - San Jose CA

International Classification:

B23H001/02
B23H007/18
G05B019/19

US Classification:

219 6916, 318571

Abstract:

A sinker electric discharge machine jump control device for reciprocating a tool electrode along a Z-axis with respect to a workpiece using a servo motor in order to expel contaminated fluid from a work gap. The jump control device includes a commanded current generator, the current generator generating a commanded current for the servo motor, and a commanded velocity generator, the velocity generator dividing a locus of a jump stroke into a plurality of segments and generating a commanded velocity for each of the plurality of segments. Additionally, the jump control device includes a velocity override calculator, the calculator generating a velocity override according to the commanded current, and a commanded velocity modifying device, the modifying device modifying the commanded velocity according to the velocity override during the jump stroke.

US Patent:

6281463, Aug 28, 2001

Filed:

Apr 6, 2000

Appl. No.:

9/544286

Inventors:

Yuji Kaneko - San Jose CA
Hidetaka Hayashi - Patumthani, TH
Kuniharu Yamada - Fukui, JP

Assignee:

Sodick Co., Ltd. - Kanagawa

International Classification:

B23H 100

US Classification:

219 6913

Abstract:

A power supply device for an electric discharge machine for supplying power to a work gap (6) formed between a work piece and a tool electrode, includes a parallel circuit in which a first power supply (8), a second power supply (36) and a capacitor (34) are connected in parallel and the second power supply can supply a larger voltage and a smaller current than the first power supply to the work gap. A switching element is connected between the parallel circuit and the work gap for pulsing power from the parallel circuit.