Abstract: An ultra-hard material fixed to a cutting tool is formed into a cutting blade by electric discharge machining. The wire electric discharge machine has a rotating shaft to which the cutting tool is mounted, and has a touch sensor mounted to an upper wire guide. A measurement program is generated on the basis of a machining path instructed by the machining program. A machining program is regenerated from rotating shaft coordinate information and path coordinate position information obtained at measurement points, on the basis of the measurement program. As a result, a rake face position of the cutting tool can be accurately measured and a wire electrode can be positioned accurately with respect to that position during machining.

Abstract: A contact detection apparatus for a wire electrical discharge machine includes a voltage application unit adapted to apply a detection voltage to detect contact between a wire electrode and a workpiece; a contact determination unit adapted to determine contact or non-contact between the wire electrode and the workpiece based on changes in the detection voltage applied by the voltage application unit; and a voltage value changing unit adapted to change a voltage value of the detection voltage applied by the voltage application unit.

Abstract: A machining program used for machining a workpiece with a wire-cut electric discharge machine is used for measuring a shape of the workpiece. A wire electrode moved in a direction away from the workpiece by an offset command for machining is moved close to the workplace in workplace measurement after the machining. In other words, the wire electrode is moved in an opposite direction to an offset direction for the machining. Then, an end face position of the machined workpiece detected by a position of the wire electrode when the wire electrode comes in contact with the workpiece.

Abstract: A contact detection apparatus for a wire electrical discharge machine includes a voltage application unit adapted to apply a detection voltage to detect contact between a wire electrode and a workpiece; a contact determination unit adapted to determine contact or non-contact between the wire electrode and the workpiece based on changes in the detection voltage applied by the voltage application unit; and a voltage value changing unit adapted to change a voltage value of the detection voltage applied by the voltage application unit.

Abstract: An ultra-hard material fixed to a cutting tool is formed into a cutting blade by electric discharge machining. The wire electric discharge machine has a rotating shaft to which the cutting tool is mounted, and has a touch sensor mounted to an upper wire guide. A measurement program is generated on the basis of a machining path instructed by the machining program. A machining program is regenerated from rotating shaft coordinate information and path coordinate position information obtained at measurement points, on the basis of the measurement program. As a result, a rake face position of the cutting tool can be accurately measured and a wire electrode can be positioned accurately with respect to that position during machining.

Abstract: A machining program used for machining a workpiece with a wire-cut electric discharge machine is used for measuring a shape of the workpiece. A wire electrode moved in a direction away from the workpiece by an offset command for machining is moved close to the workplace in workplace measurement after the machining. In other words, the wire electrode is moved in an opposite direction to an offset direction for the machining. Then, an end face position of the machined workpiece detected by a position of the wire electrode when the wire electrode comes in contact with the workpiece.

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.

Abstract: A wire electrode supply device capable of preventing slack and snapping of a wire electrode even using a heavy wire bobbin without using a wire electrode tension detector. A pulley is provided between the wire bobbin driven by a torque motor and a brake roller. The wire electrode unwinds from the wire bobbin, passes through the pulley, brake roller and a workpiece work area, and is taken up by a wind-up roller. When the wire electrode traveling speed is changed from fast to slow, the pulley descends to prevent the wire electrode from slackening between the wire bobbin and the brake roller. When the traveling speed is changed from slow to fast, the back tension from the torque motor is reduced for a predetermined period of time, reducing tension on the wire electrode and preventing it from snapping.

Abstract: A wire-cut electric discharge machine which improves contact between a wire electrode and a conducting member without deforming the wire electrode to suppress production of minute electric discharges and reduce unnecessary loads on the wire electrode and the wire-cut electric discharge machine, and which makes it easy to make space on a wire traveling path to carry out automatic wire connection easily. In a wire-cut electric discharge machine having a conducting member for supplying an wire electrode with electric power for electric discharge machining, and making the wire electrode travel along a traveling path, sliding on the conducting member, a movable member capable of being moved nearer to and away from the conducting member is provided in a position opposite to the conducting member relative to the traveling path. By this arrangement, the contact between the wire electrode and the conducting member can be always kept without deforming the wire electrode.

Abstract: The device for treating working fluid includes a fluid level detecting device for detecting a fluid level of cleaned fluid in a cleaned fluid tank, and a control unit for determining an adjustment value for a discharge rate command for a filter device pump, based on the fluid level detected by the fluid level detecting device. The control unit operates to determine a renewed discharge rate command by adding the adjustment value thus determined to the present discharge rate command, and to output the renewed discharge rate command to a pump controller. The pump controller drives the filter device pump according to the discharge rate command to transfer the working fluid from the polluted fluid tank to the cleaned fluid tank through the filter device.

Abstract: A used wire cutting device for wire cut electric discharge machine which appropriately determines the time to replace a movable blade and a fixed blade of a cutting mechanism on the basis of not only time but also the degree of wear of each blade. The device includes a wear rate storage means for storing the wear rate per cut (1/P) of a blade of the wire cutting device depending on the diameter and material of the wire. The number of cuts performed during machining is obtained from the length of time from the start to the end of machining, and the number of actions of cutting per unit time. The number of cuts obtained is multiplied by the wear rate (1/P) for the wire used, and the resultant value is added to the last value of total wear rate R. With the value thus obtained, the last value of the total wear rate R is replaced.

Abstract: A wire-cut electric discharge machine which improves contact between a wire electrode and a conducting member without deforming the wire electrode to suppress production of minute electric discharges and reduce unnecessary loads on the wire electrode and the wire-cut electric discharge machine, and which makes it easy to make space on a wire traveling path to carry out automatic wire connection easily. In a wire-cut electric discharge machine having a conducting member for supplying an wire electrode with electric power for electric discharge machining, and making the wire electrode travel along a traveling path, sliding on the conducting member, a movable member capable of being moved nearer to and away from the conducting member is provided in a position opposite to the conducting member relative to the traveling path. By this arrangement, the contact between the wire electrode and the conducting member can be always kept without deforming the wire electrode.

Abstract: A wire-cut electric discharge machine capable of taking out a cutoff piece smoothly upwardly of a workpiece even if the cutoff piece has a complicated shape, by holding the cutoff piece horizontally not to change an orientation thereof. The wire-cut electric discharge machine comprises a takeout head having a plurality of permanent magnets for holding the cutoff piece by magnetic force and a motion restriction member for restricting motion of the held cutoff piece relative to the permanent magnets. Sliding apparatus for sliding the plurality of magnets independently to project from and retract into the motion restricting member, transferring apparatus for transferring the takeout head and selecting apparatus for selecting at least one of the plurality of permanent magnets to exert the magnetic force on the cutoff piece in accordance with a shape of the cutoff piece are provided.

Abstract: A used wire cutting device for wire cut electric discharge machine which appropriately determines the time to replace a movable blade and a fixed blade of a cutting mechanism on the basis of not only time but also the degree of wear of each blade. The device includes a wear rate storage means for storing the wear rate per cut (1/P) of a blade of the wire cutting device depending on the diameter and material of the wire. The number of cuts performed during machining is obtained from the length of time from the start to the end of machining, and the number of actions of cutting per unit time. The number of cuts obtained is multiplied by the wear rate (1/P) for the wire used, and the resultant value is added to the last value of total wear rate R. With the value thus obtained, the last value of the total wear rate R is replaced.

Abstract: A wire-cut electric discharge machine comprises a wire running system, in which a wire is run through a wire bobbin, brake rollers, a wire guide, and a wire take-up device in the order named. As a device for reducing the variation in wire tension is arranged between the wire bobbin and the brake rollers in the wire running system, variation of the wire tension that is caused on the wire supply side of the brake rollers can be restrained effectively.

Abstract: A wire-cut electric discharge machine capable of taking out a cutoff piece smoothly upwardly of a workpiece even if the cutoff piece has a complicated shape, by holding the cutoff piece horizontally not to change an orientation thereof. The wire-cut electric discharge machine comprises a takeout head having a plurality of permanent magnets for holding the cutoff piece by magnetic force and a motion restriction member for restricting motion of the held cutoff piece relative to the permanent magnets. Sliding means for sliding the plurality of magnets independently to project from and retract into the motion restricting member, transferring means for transferring the takeout head and selecting means for selecting at least one of the plurality of permanent magnets to exert the magnetic force on the cutoff piece in accordance with a shape of the cutoff piece are provided.

Abstract: A wire electric discharge machine having a simple mechanism for retracting and collecting a cutoff piece (machined chip or machined product). A cutoff piece receiving basket for receiving a cutoff piece produced during machining is attached to a support bar mounted to a lower guide block, the basket being rotatably supported by a rotary support shaft. A bearing provided in the support bar is located immediately short of a cam block, and then fitted into a slot by X-axis movement. A moment is applied to the support bar by Y-axis movement to rotate the cutoff piece receiving basket around the rotary support shaft, so that the basket is retreated to above a cutoff piece collecting box and then turned over, whereby a cutoff piece received in the basket falls into the collecting box. The cutoff piece receiving basket may be rotated manually or rotated by use of a robot, a special-purpose motor, an air cylinder, etc.

Abstract: A wire electric discharge machining apparatus having a structure for supplying power to a wire electrode which prolongs the life of a power supply element and reduces manufacturing and running costs. A guide roller is driven by a small motor through a lead screw and guides the wire electrode above and/or below the power supply element, formed as a flat plate and driven in an oscillating direction perpendicular to a running direction of the wire electrode and parallel to a flat surface of the power supply element. A contact position of the wire electrode on the power supply element is varied over an area of a wide range, avoiding creation of a groove or the like, attributable to friction, in the power supply element and extending the life thereof.

Abstract: The device for treating working fluid includes a fluid level detecting device for detecting a fluid level of cleaned fluid in a cleaned fluid tank, and a control unit for determining an adjustment value for a discharge rate command for a filter device pump, based on the fluid level detected by the fluid level detecting device. The control unit operates to determine a renewed discharge rate command by adding the adjustment value thus determined to the present discharge rate command, and to output the renewed discharge rate command to a pump controller. The pump controller drives the filter device pump according to the discharge rate command to transfer the working fluid from the polluted fluid tank to the cleaned fluid tank through the filter device.

Abstract: A wire electric discharge machine having a simple mechanism for retracting and collecting a cutoff piece (machined chip or machined product). A cutoff piece receiving basket for receiving a cutoff piece produced during machining is attached to a support bar mounted to a lower guide block, the basket being rotatably supported by a rotary support shaft. A bearing provided in the support bar is located immediately short of a cam block, and then fitted into a slot by X-axis movement. A moment is applied to the support bar by Y-axis movement to rotate the cutoff piece receiving basket around the rotary support shaft, so that the basket is retreated to above a cutoff piece collecting box and then turned over, whereby a cutoff piece received in the basket falls into the collecting box. The cutoff piece receiving basket may be rotated manually or rotated by use of a robot, a special-purpose motor, an air cylinder, etc.