Electrical discharge machining apparatus

Patent metadata

Field	Value
Publication number	US-9737945-B2
Application number	US-201414781449-A
Country	US
Kind code	B2
Filing date	Mar 27, 2014
Priority date	Mar 27, 2014
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

An electrical discharge machining apparatus includes: a surface plate; a machining tank that surrounds the surface plate, retains a machining liquid, and has at least a part that serves as a substantially box-shaped vertically moveable ascent/descent machining tank, the ascent/descent machining tank having an outlet in an ascent/descent inner wall of the ascent/descent machining tank; an ascent/descent device that raises and lowers the ascent/descent machining tank; a sub-tank that receives the machining liquid that overflows from the machining tank; a slit that is provided in an end wall of the sub-tank for allowing a connection member to pass through, the connection member connecting the ascent/descent machining tank and the ascent/descent device; and a seal that is arranged in a gap between the ascent/descent machining tank and an inner wall of the sub-tank and prevents the machining liquid in the machining tank from leaking out into the sub-tank.

First claim

The invention claimed is:

1. An electrical discharge machining apparatus, comprising:
a surface plate that a workpiece is placed on;
a machining tank that surrounds the surface plate, retains a machining liquid, and has at least a part that serves as a box-shaped vertically moveable ascent/descent machining tank, the ascent/descent machining tank having an outlet in an ascent/descent inner wall of the ascent/descent machining tank, the outlet allowing the machining liquid to overflow to the ascent/descent machining tank;
an ascent/descent device that raises and lowers the ascent/descent machining tank;
a sub-tank that receives the machining liquid that leaks out from the machining tank;
a slit that is provided in an end wall of the sub-tank for allowing a connection member to pass through, the connection member connecting the ascent/descent machining tank and the ascent/descent device; and
a seal that is arranged in a gap between the ascent/descent machining tank and an inner wall of the sub-tank and prevents the machining liquid in the machining tank from leaking out into the sub-tank,
the electrical discharge machining apparatus creating an electrical discharge in a small gap between the workpiece and an electrode to machine the workpiece, the workpiece being immersed in the machining liquid retained in the machining tank, wherein
a slit-like receiving opening is provided at a bottom of the ascent/descent machining tank on the ascent/descent inner wall side, the slit-like receiving opening receiving the machining liquid that leaks through the seal and drips along the ascent/descent inner wall and recovering the machining liquid in the ascent/descent machining tank.

2. An electrical discharge machining apparatus, comprising:
a surface plate that a workpiece is placed on;
a machining tank that surrounds the surface plate, retains a machining liquid, and has at least a part that serves as a substantially box-shaped vertically moveable ascent/descent machining tank, the ascent/descent machining tank having an outlet in an ascent/descent inner wall of the ascent/descent machining tank, the outlet allowing the machining liquid to overflow to the ascent/descent machining tank;
an ascent/descent device that raises and lowers the ascent/descent machining tank; and
a seal that is arranged in a gap between the ascent/descent machining tank and a plate member arranged along a side face of a bed that supports the machining tank, the seal preventing the machining liquid in the machining tank from leaking downward,
the electrical discharge machining apparatus creating an electrical discharge in a small gap between the workpiece and an electrode to machine the workpiece, the workpiece being immersed in the machining liquid retained in the machining tank, wherein
a slit-like receiving opening is provided at a bottom of the ascent/descent machining tank on the ascent/descent inner wall side, the slit-like receiving opening receiving the machining liquid that leaks through the seal and drips along the ascent/descent inner wall and recovering the machining liquid in the ascent/descent machining tank, and a seal member is attached to an edge of a bottom plate of the ascent/descent machining tank at which the ascent/descent machining tank is cut open to form the receiving opening, the seal member being attached in such a manner that an edge of the seal member is in contact with the plate member arranged along the side face of the bed that supports the machining tank.

Assignees

• Mitsubishi Electric Corp

Inventors

• Nakajima Yoji
• Abe Tatsuya

Classifications

• B23H7/02

  Wire-cutting · CPC title

• B23H7/36

  Supply or regeneration of working media · CPC title

• B23H1/04

  Electrodes specially adapted therefor or their manufacture (B23H9/00 takes precedence) · CPC title

• B23H1/10 Primary

  Supply or regeneration of working media · CPC title