WIRE ELECTRIC DISCHARGE MACHINING APPARATUS

• US 20150129558A1
• Filed: 10/30/2012
• Published: 05/14/2015
• Est. Priority Date: 10/30/2012
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Otomo, Yoichi, Kita, Hideaki, Kakihana, Takashi
• Granted Patent: US 9,421,627 B2
• Time in Patent Office: Days
• US Class Current: 219/69.12
• CPC Class Codes: B23H 1/10 Supply or regeneration of working media
• CPC Class Codes: B23H 11/00 Auxiliary apparatus or details, not otherwise provided for
• CPC Class Codes: B23H 11/003 Mounting of workpieces, e.g. working-tables
• 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 7/34 Working media
• CPC Class Codes: B23H 7/36 Supply or regeneration of working media

Abstract

A wire electric discharge machining apparatus that machines a workpiece by using a wire supported between a lower arm and an upper arm. The apparatus includes a surface plate that has a vacant inner area in which the wire moves and supports part of the workpiece with an outer area thereof. The apparatus further includes a bellows that extends through a side surface of a casing of a machining bath, enclosing part of the lower arm, wherein a first end of the bellows that is on a side of the machining bath is attached to the lower arm so that the bellows does not get in under the inner area, at whatever position the wire machines the workpiece.

Claims

1. A wire electric discharge machining apparatus which machines a workpiece by using a wire supported between a lower arm and an upper arm, comprising:

a surface plate, having a vacant inner area, for placing the workpiece thereon by supporting part of the workpiece with an outer area thereof, wherein the wire moves in the inner area;

a machining bath having a casing for holding a machining liquid for placing the surface plate in the casing, wherein the casing is supplied with the machining liquid to a position for machining the workpiece, wherein the lower arm extends through a side surface of the casing, and wherein by moving a horizontal relative position between the lower and upper arms and the casing, a horizontal relative position between the wire and the workpiece is moved; and

a bellows extending through the side surface and enclosing part of the lower arm,

wherein a first end of the bellows that is on a side of the machining bath is attached to the lower arm so that the bellows does not get in under the inner area, at whatever position the wire machines the workpiece.

2. The wire electric discharge machining apparatus according to claim 1, further comprising:

a housing attached to the outside of the machining bath for housing the bellows when the bellows is contracted, and

wherein a second end of the bellows that is on an opposite side of the machining bath is attached to the housing.

3. The wire electric discharge machining apparatus according to claim 2,

wherein the housing has a first shield extending perpendicular to an axis direction of the lower arm to block the machining liquid flying in the axis direction of the lower arm, and

wherein the second end is attached to the first shield.

4. The wire electric discharge machining apparatus according to claim 1, further comprising a second shield placed between the end of the lower arm opposite to the machining bath and the housing and extending perpendicular to an axis direction of the lower arm for blocking the machining liquid flying in the axis direction of the lower arm.

5. The wire electric discharge machining apparatus according to claim 4, wherein the second shield is an annular member attached to the lower arm.

6. The wire electric discharge machining apparatus according to claim 4,

wherein the second shield is attached to a member other than the lower arm, and

wherein the lower arm extends through the second shield.