A wire disconnection prediction device includes: a data acquisition part configured to acquire data relating to machining of a workpiece during machining of the workpiece by a wire electric discharge machine; a preprocessing part configured to create, based on the data acquired by the data acquisition part, machining condition data, machining member data and machining state data, as state data indicating a state of the machining; and a machine learning device configured to execute, based on the state data created by the preprocessing part, processing relating to machine learning using a learning model indicating correlation between a machining state in the wire electric discharge machine and presence/absence of a possibility of disconnection occurrence of a wire electrode in the wire electric discharge machine and a disconnection cause by a plurality of class sets.

A wire disconnection prediction device includes: a data acquisition part configured to acquire data relating to machining of a workpiece in a state where a wire is not disconnected during machining of the workpiece by a wire electric discharge machine; a preprocessing part configured to create, machining condition data of a condition relating to a machining condition commanded in machining of the workpiece, machining member data relating to a member used in the machining, and machining state data during machining of the workpiece, as state data indicating a state of the machining; and a learning part configured to generate, based on the state data created by the preprocessing part, a learning model indicating correlation between the state data and the state where the wire of the wire electric discharge machine is not disconnected.

A threading nozzle for threading a wire electrode for a threading device in a wire electrical discharge erosion machine includes a threading-nozzle body having a guide bore configured to guide the wire electrode along a longitudinal axis of the former and a gap that splits the threading-nozzle body in two parts which are connected at a flexural hinge configured in the threading-nozzle body. The gap splits the guide bore in two parts.

A wire electric discharge machining apparatus includes: a processing tank, a lower-side wire guide assembly, a lower arm, a direction changing pulley, a winding roller, and a conveying device. The conveying device comprises a high-pressure jet flow generator and a suction pipe. The high-pressure jet flow generator is provided between the direction changing pulley and the winding roller on a side of a front end of a lower arm, and spouts a high-pressure jet flow toward a direction of the winding roller so that a wire electrode is guided only by a restraining force of the high-pressure jet flow and sent flying to the direction of the winding roller with the high-pressure jet flow. The suction pipe is provided on an exit side of the winding roller, and sucks and captures a tip of the wire electrode sent by the high-pressure jet flow.

A wire electrical discharge machine includes a guide pipe arranged in a path along which a wire electrode is fed from a feed roller to a workpiece, and formed with an insertion hole through which the wire electrode is inserted, a compressed air supply device configured to supply compressed air to the insertion hole so that compressed air flows through the insertion hole along a feed direction of the wire electrode, a database configured to store data indicative of a relationship between rigidity information of the wire electrode and pressure information of compressed air, and a controller configured to set pressure of the compressed air supplied to the insertion hole, based on the rigidity information of the wire electrode fed to the workpiece and the data.

A wire electrical discharge machine having an auto wire feeding function includes: guide parts arranged on a wire feed path along which the wire electrode is fed so as to guide the feeding of the wire electrode; fluid paths formed with the guide parts to supply a compressed fluid to the wire feed path; a compressed fluid supply device to supply the compressed fluid to the fluid paths; a tension detector to detect the tension of the wire electrode; and a control device that controls the compressed fluid supply device so as to supply the compressed fluid to the fluid paths, and based on the detection result from the tension detector, determines whether or not the wire electrode has reached a supply position of one of the fluid paths on the wire feed path to which the fluid has been supplied.

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.

A wire guide device of a wire electrical discharge machine includes a first roller shaft, a first wire guide roller provided at an end of the first roller shaft, a second roller shaft, and a second wire guide roller provided at an end of the second roller shaft and having an end face in an axial direction provided to face an end face of the first wire guide roller in the axial direction. The first wire guide roller and the second wire guide roller have a conical surface and a conical surface with which a wire electrode is in contact.

A wire electrical discharge machine includes: a travelling route formed of multiple divisional regions, through which a wire electrode is fed by an auto wire feeding mechanism; and a memory storing failure evaluation reference data on the auto wire feeding for every divisional region. The wire electrical discharge machine detects failure of the auto wire feeding and locate the tip position of the wire electrode at the time of failure and causes a controller to determine whether to perform or stop retry of the auto wire feeding based on the located tip position and the failure evaluation reference data for every divisional region.

A wire disconnection prediction device includes: a data acquisition part configured to acquire data relating to machining of a workpiece during machining of the workpiece by a wire electric discharge machine; a preprocessing part configured to create, based on the data acquired by the data acquisition part, machining condition data, machining member data and machining state data, as state data indicating a state of the machining; and a machine learning device configured to execute, based on the state data created by the preprocessing part, processing relating to machine learning using a learning model indicating correlation between a machining state in the wire electric discharge machine and presence/absence of a possibility of disconnection occurrence of a wire electrode in the wire electric discharge machine and a disconnection cause by a plurality of class sets.