Wire electric discharge machine

• US 6,344,624 B1
• Filed: 06/16/2000
• Issued: 02/05/2002
• Est. Priority Date: 10/16/1998
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Satou, Seiji, Moro, Toshio
• Primary Examiner(s): Evans, Geoffrey S.
• Application Number:
  US09/581,744
• Time in Patent Office: 599 Days
• Field of Search: 219/69.12, 219/69.14
• US Class Current: 219/69.12
• CPC Class Codes: B23H 7/02 Wire-cutting
• CPC Class Codes: B23H 7/10 Supporting, winding or electrical connection of wire-electrode
• CPC Class Codes: B23H 7/101 Supply of working media
• CPC Class Codes: B23H 7/105 Wire guides
• CPC Class Codes: B23H 7/36 Supply or regeneration of working media

Abstract

There are provided an upper guide (118) and a lower guide (109) which are respectively disposed above and below a workpiece (25) and respectively incorporate wire guides for guiding a wire electrode (119); a nozzle for jetting and supplying a working fluid from at least one of the upper guide (118) and the lower guide (109) toward the workpiece (25); and a pump for supplying the working fluid to the nozzle, so that a gas is mixed into the working fluid in a channel of the working fluid from the pump to the nozzle, and the working fluid in a state of a gas-liquid mixed phase is jetted and supplied from the nozzle to the workpiece (25).

Claims

1. A wire electrical discharge machining apparatus in which a working fluid is interposed between a wire electrode and a workpiece to machine the workpiece by electrical discharge, comprising:

an upper guide and a lower guide which are respectively disposed above and below the workpiece and respectively incorporate wire guides for guiding said wire electrode;

a nozzle for jetting and supplying the working fluid from

at least one of said upper guide and said lower guide toward the workpiece; and

a pump for supplying the working fluid to said nozzle,

wherein a gas is mixed into the working fluid on an upstream side of said pump, and the working fluid in a state of a gas-liquid mixed phase is jetted and supplied from said nozzle to the workpiece.

2. The wire electrical discharge machining apparatus according to claim 1, wherein said nozzle is constructed with a double structure, the working fluid in the state of the gas-liquid mixed phase is jetted out from an internal nozzle, and the working fluid in which the gas is not mixed is jetted out from an external nozzle.

3. A wire electrical discharge machining apparatus in which a working fluid is interposed between a wire electrode and a workpiece to machine the workpiece by electrical discharge, comprising:

an upper guide and a lower guide which are respectively disposed above and below the workpiece and respectively incorporate wire guides for guiding said wire electrode;

a nozzle for jetting and supplying the working fluid from at least one of said upper guide and said lower guide toward the workpiece; and

a pump for supplying the working fluid to said nozzle,

wherein a gas is mixed into the working fluid inside a cooling container disposed on an upstream side of said pump, and the working fluid in a state of a gas-liquid mixed phase is jetted and supplied from said nozzle to the workpiece.

4. The wire electrical discharge machining apparatus according to claim 3, wherein said nozzle is constructed with a double structure, the working fluid in the state of the gas-liquid mixed phase is jetted out from an internal nozzle, and the working fluid in which the gas is not mixed is jetted out from an external nozzle.