A mechanism in a wire electrical discharge machining apparatus for machining a workpiece by electrical discharge between a wire and the workpiece is disclosed. The mechanism includes a processing fluid bath configured to store processing fluid used for electrical discharge machining between the workpiece and the wire, a processing fluid supply port to communicate with the processing fluid bath and supply the processing fluid into the processing fluid bath from a processing fluid supply apparatus supplying the processing fluid, and a stream control mechanism to suppress a stream of the processing fluid supplied from the processing fluid supply port into the processing fluid bath in the direction of the water surface of the processing fluid in the processing fluid bath.

A mechanism in a wire electrical discharge machining apparatus for machining a workpiece by electrical discharge between a wire and the workpiece is disclosed. The mechanism includes a processing fluid bath configured to store processing fluid used for electrical discharge machining between the workpiece and the wire, a processing fluid supply port to communicate with the processing fluid bath and supply the processing fluid into the processing fluid bath from a processing fluid supply apparatus supplying the processing fluid, and a stream control mechanism to suppress a stream of the processing fluid supplied from the processing fluid supply port into the processing fluid bath in the direction of the water surface of the processing fluid in the processing fluid bath.

The opening machining apparatus for the heat transfer tube includes an electric discharge machining device inserted into the heat transfer tube and configured to form an opening in a tube wall of the heat transfer tube through an electric discharge machining, an electric discharge machining device driving device connected to the electric discharge machining device and configured to transport the electric discharge machining device, an electric discharge machining device driving device connected to the electric discharge machining device and configured to provide force for bringing the electric discharge machining device into contact with a tube wall surface of the heat transfer tube, and an electric discharge machining device rotation device configured to provide force for rotating the electric discharge machining device in a circumferential direction of the heat transfer tube in the heat transfer tube.

The opening machining apparatus for the heat transfer tube includes an electric discharge machining device inserted into the heat transfer tube and configured to form an opening in a tube wall of the heat transfer tube through an electric discharge machining, an electric discharge machining device driving device connected to the electric discharge machining device and configured to transport the electric discharge machining device, an electric discharge machining device driving device connected to the electric discharge machining device and configured to provide force for bringing the electric discharge machining device into contact with a tube wall surface of the heat transfer tube, and an electric discharge machining device rotation device configured to provide force for rotating the electric discharge machining device in a circumferential direction of the heat transfer tube in the heat transfer tube.

The micro-electric discharge milling machine includes a base having an X-axis guide plate mounted thereon, allowing for movement in the X-direction. A Y-axis guide plate is mounted on the X-axis guide plate, allowing for movement in the Y-direction. A dielectric bin is located on the Y-axis guide plate and is movable in the X-direction and the Y-direction via the X-axis guide plate and Y-axis guide plate, respectively. A workpiece platform is located within the dielectric bin for securing a workpiece. A vertical plate with a Z-axis guide plate extends from the base. A drill chuck is mounted on the Z-axis guide plate for securing a rotating electrode. A spark control circuit controls a location of a spark generated by the rotating electrode with respect to a surface of the rotating electrode.

The micro-electric discharge milling machine includes a base having an X-axis guide plate mounted thereon, allowing for movement in the X-direction. A Y-axis guide plate is mounted on the X-axis guide plate, allowing for movement in the Y-direction. A dielectric bin is located on the Y-axis guide plate and is movable in the X-direction and the Y-direction via the X-axis guide plate and Y-axis guide plate, respectively. A workpiece platform is located within the dielectric bin for securing a workpiece. A vertical plate with a Z-axis guide plate extends from the base. A drill chuck is mounted on the Z-axis guide plate for securing a rotating electrode. A spark control circuit controls a location of a spark generated by the rotating electrode with respect to a surface of the rotating electrode.