Abstract: A wire electrical discharge machine includes: a guide pipe as a guide member arranged on a path for feeding a wire electrode from a feed roller toward a workpiece and having a passage hole through which the wire electrode is passed; an airflow generator for generating a flow of compressed air in the passage hole and switching a flow direction of compressed air flowing through the passage hole between a forward direction and a reverse direction; a deflection detector for detecting a deflection of the wire electrode; and a control device for controlling the airflow generator so as to generate a flow of compressed air in the forward direction in the passage hole during auto wire feeding and, when the deflection detector detects the deflection, change the flow direction of compressed air to the reverse direction and thereafter switch the flow direction of compressed air to the forward direction.

Abstract: A wire electrical discharge machine includes: a guide pipe as a guide member arranged on a path for feeding a wire electrode from a feed roller toward a workpiece and having a passage hole through which the wire electrode is passed; an airflow generator for generating a flow of compressed air in the passage hole and switching a flow direction of compressed air flowing through the passage hole between a forward direction and a reverse direction; a deflection detector for detecting a deflection of the wire electrode; and a control device for controlling the airflow generator so as to generate a flow of compressed air in the forward direction in the passage hole during auto wire feeding and, when the deflection detector detects the deflection, change the flow direction of compressed air to the reverse direction and thereafter switch the flow direction of compressed air to the forward direction.

Abstract: A wire electrical discharge machine includes a contact detector provided at a lower nozzle and configured to detect contact of a wire electrode with the exterior of the lower nozzle, a suction unit configured to suction working fluid into the lower nozzle, and a wire feeding mechanism configured to pass the wire electrode through a machining hole in a workpiece and feed the wire electrode toward the lower nozzle. When auto wire feeding is performed with a work-pan containing working fluid, the wire electrode (is fed toward the lower nozzle by the wire feeding mechanism while the suction unit suctions the working fluid into the lower nozzle. When the contact detector detects contact of the wire electrode with the exterior of the lower nozzle, the wire electrode is rewound by the wire feeding mechanism.

Abstract: A wire electric discharge machine is provided with a storage unit configured to store the flow rate of a machining fluid delivered to a sealing portion in a machining tank in association with the flow rate of the machining fluid delivered to a nozzle. The flow rate of the machining fluid delivered to the nozzle is measured, and the flow rate of the machining fluid to be supplied to the sealing portion is read from the flow rate storage unit and set, based on the measured flow rate.

Abstract: A rotary table apparatus includes a rotary table body, a table rotor supported on the rotary table body and configured to be rotatable, a driving unit for driving the table rotor, a seal mechanism including a sealer disposed between the rotary table body and the table rotor, and a first supply unit configured to supply clean fluid for use in machining to the seal mechanism.

Abstract: There is provided a wire electrical discharge machine that includes a temperature detection unit, an actual position correction amount calculation unit, a correction amount calculation unit, a correction amount adjustment unit, a position correction amount adjustment unit, and a corrective movement amount calculation unit. The actual position correction amount calculation unit calculates an actual position correction amount for an upper/lower guide section in accordance with reference position coordinates at a reference temperature and with actual position coordinates at a temperature different from the reference temperature. The correction amount calculation unit uses a prepared correction amount arithmetic expression. The correction amount adjustment unit calculates a correction amount adjustment value from the actual position correction amount and the position correction amount.

Abstract: The present invention provides a wire electric discharge machine including an automatic connection function that enables automatic connection to be securely performed even when no person is present in the surroundings of the machine (with no manual operation). The wire electric discharge machine performs automatic setting procedure of a connection condition and determines whether it is the time point stored in a computer numerical control (CNC) device. When it is the time point stored (YES), an automatic connection condition 2 is read. When it is not the time point stored (NO), an automatic connection condition 1 is read. The wire electric discharge machine then performs disconnection procedure and connection procedure to complete the process.

Abstract: A working fluid supply device of an electric discharge machine draws up a cleaned fluid from a cleaned-fluid tank by means of a pump and supplies it to a working tank. The pump is connected with a first fluid circuit configured to supply the drawn cleaned fluid to the working tank and a second fluid circuit configured to supply the drawn cleaned fluid to an ion-exchange resin and a refrigerator. In supplying the cleaned fluid to the working tank, the first and second fluid circuits are opened and closed, respectively. In supplying the cleaned fluid to the ion-exchange resin and the refrigerator, the first and second fluid circuits are closed and opened, respectively.

Abstract: A rotary table apparatus includes a rotary table body, a table rotor supported on the rotary table body and configured to be rotatable, a driving unit for driving the table rotor, a seal mechanism including a sealer disposed between the rotary table body and the table rotor, and a first supply unit configured to supply clean fluid for use in machining to the seal mechanism.

Abstract: There is provided a wire electrical discharge machine that includes a temperature detection unit, an actual position correction amount calculation unit, a correction amount calculation unit, a correction amount adjustment unit, a position correction amount adjustment unit, and a corrective movement amount calculation unit. The actual position correction amount calculation unit calculates an actual position correction amount for an upper/lower guide section in accordance with reference position coordinates at a reference temperature and with actual position coordinates at a temperature different from the reference temperature. The correction amount calculation unit uses a prepared correction amount arithmetic expression. The correction amount adjustment unit calculates a correction amount adjustment value from the actual position correction amount and the position correction amount.

Abstract: A wire electric discharge machine is provided with a storage unit configured to store the flow rate of a machining fluid delivered to a sealing portion in a machining tank in association with the flow rate of the machining fluid delivered to a nozzle. The flow rate of the machining fluid delivered to the nozzle is measured, and the flow rate of the machining fluid to be supplied to the sealing portion is read from the flow rate storage unit and set, based on the measured flow rate.

Abstract: A wire electric discharge machine is provided with an automatic wire-connection pipe movable between an automatic wire connection position and a retracted position. A pickup unit configured to clamp a wire electrode to be cut is disposed below a wire cutting electrode on the outlet side of the automatic wire-connection pipe. The wire electric discharge machine is further provided with a stopper mechanism configured to regulate a movement of the automatic wire-connection pipe so that a distal end of a nozzle of the automatic wire-connection pipe is located between the wire cutting electrode and the pickup unit when the wire electrode is cut.

Abstract: While machining is carried out according to a machining program by an electric discharge machine, the pressures of a machining fluid supplied from upper and lower nozzles are detected and displacement amounts of upper and lower wire guides are obtained from the detected pressures. Further, positional compensation values of the upper and lower wire guides are calculated on the basis of the obtained displacement amounts, and command values of the machining program are compensated on the basis of the calculated positional compensation values.

Abstract: A working fluid supply device of an electric discharge machine draws up a cleaned fluid from a cleaned-fluid tank by means of a pump and supplies it to a working tank. The pump is connected with a first fluid circuit configured to supply the drawn cleaned fluid to the working tank and a second fluid circuit configured to supply the drawn cleaned fluid to an ion-exchange resin and a refrigerator. In supplying the cleaned fluid to the working tank, the first and second fluid circuits are opened and closed, respectively. In supplying the cleaned fluid to the ion-exchange resin and the refrigerator, the first and second fluid circuits are closed and opened, respectively.

Abstract: A wire electric discharge machine is provided with an automatic wire-connection pipe movable between an automatic wire connection position and a retracted position. A pickup unit configured to clamp a wire electrode to be cut is disposed below a wire cutting electrode on the outlet side of the automatic wire-connection pipe. The wire electric discharge machine is further provided with a stopper mechanism configured to regulate a movement of the automatic wire-connection pipe so that a distal end of a nozzle of the automatic wire-connection pipe is located between the wire cutting electrode and the pickup unit when the wire electrode is cut.

Abstract: An electric discharge unit of an electric discharge machine is disposed in a working tank, and a working fluid in the working tank is delivered to a filter tank by a pump. A filter for working fluid filtration wound off from a roll faces apertures in the bottom of the filter tank. When the internal pressure of the filter tank exceeds a predetermined value, the filter is moved a predetermined distance downward of the filter tank. In a position off the filter tank, that part of the filter which has been used for filtration is cleaned.

Abstract: When a wire electrode is arranged along a traveling path by manual operation, a motor M1 for feeding the wire electrode to a workpiece is driven in response to a predetermined torque command from a control section with a switch SW1 on a side a. The wire electrode is connected, and a motor M2 for delivering the electrode from the wire is driven at a predetermined speed, whereby the electrode is run. Then, the switch SW1 is shifted to a side b and a switch SW2 to the side a, and the motor M1 is subjected to torque control such that a tension on the wire electrode detected by a tension detector is equal to a command tension. When a variation of the tension on the wire electrode is converged, the switches SW1 and SW2 are shifted to the side b, speed control of the motor M1 is performed so that detected tension is equal to the command tension, and electric discharge machining is started.

Abstract: When a wire electrode is arranged along a traveling path by manual operation, a motor M1 for feeding the wire electrode to a workpiece is driven in response to a predetermined torque command from a control section with a switch SW1 on a side a. The wire electrode is connected, and a motor M2 for delivering the electrode from the wire is driven at a predetermined speed, whereby the electrode is run. Then, the switch SW1 is shifted to a side b and a switch SW2 to the side a, and the motor M1 is subjected to torque control such that a tension on the wire electrode detected by a tension detector is equal to a command tension. When a variation of the tension on the wire electrode is converged, the switches SW1 and SW2 are shifted to the side b, speed control of the motor M1 is performed so that detected tension is equal to the command tension, and electric discharge machining is started.

Abstract: A wire electrode supply device for a wire-cut electric discharge machine that prevents a wire electrode from departing from a wire traveling path using a simple configuration. A wire bobbin is driven in a reverse direction of a wire feed direction by a torque motor to apply tension to the wire electrode. A velocity detector that detects a rotation velocity of the wire bobbin is provided. The wire electrode is laid along the wire traveling path that includes a guide roller, a brake roller, upper and lower guides, and a wire take-up roller, during which, when the wire electrode is fed out from the wire bobbin, if a velocity detected by the velocity detector meets or exceeds a predetermined velocity, the output torque of the torque motor 3 is increased so that inertial force of the wire bobbin causes the wire electrode to slacken, thus preventing the wire electrode from departing from the wire traveling path.