Fanuc Corporation

Yasuo Nakashima

Akiyoshi Kawahara

Tomoyuki Furuta

Masao Murai

Akihiro Sakurai

Masashi Masuda

Yasuo Hasegawa

Tomoaki Matsunaga

Shinji Yoda

Nan Han

A wire electrical discharge machine includes: a voltage application unit for repeatedly applying a voltage to an electrode gap between the workpiece and the wire electrode at a predetermined cycle; a switching element connected in parallel with the electrode gap and configured to short-circuit the electrode gap; and a control section for controlling the switching element so as to short-circuit the electrode gap in a pause period during which the voltage is not applied. The control section adjusts a short-circuiting period in which the electrode gap is short-circuited according to the machining shape specified by a machining program.

Wire electrical discharge machine and control method

A control device of a wire electric discharge machine and a machine learning device are provided that can appropriately and readily determine a correction parameter. The control device, which optimizes the correction parameter for wire electrical discharge machining process, includes a machine learning device configured to learn the correction parameter for the wire electrical discharge machining process. The machine learning device includes a state observation unit configured to observe, as a state variable, condition data indicative of a condition for the wire electrical discharge machining process, a determination data acquisition unit configured to acquire determination data indicative of the correction parameter of the case where machining precision is favorable in the wire electrical discharge machining process, and a learning unit configured to learn the correction parameter in association with the condition for the wire electrical discharge machining process using the state variable and the determination data.

Control device of wire electric discharge machine and machine learning device

A wire electrical discharge machine includes: an electrode unit for supplying a machining current to an electrode gap; a switch for changing impedance between a machining power source and the electrode unit; and a controller for, at the time of a core retaining process, controlling the switch to set the impedance to be higher than the impedance in a cutting process and thereby suppressing the machining current flowing through the electrode gap.

Wire electrical discharge machine

An electrical discharge machine is disclosed having a concentration detection function for a rust inhibitor containing an organic compound uses coloring of a metal complex produced through the reaction of the rust inhibitor with a color reagent to enable a detector to detect the change of characteristics involved in the change of the color of the metal complex. A predetermined amount of working fluid is sampled in a sampling cell at regular time intervals, a predetermined amount of color reagent is added to the working fluid, and the change of the color of the working fluid is detected by the detector.

Electrical discharge machine having concentration detection function for rust inhibitor containing organic compound

An electrical discharge machine includes: a machining power supply having a plurality of different circuit states, and configured to be capable of being set to one circuit state of the plurality of circuit states by switching at least one of electrical connection and electrical setting; a state determining unit configured to, when each of the plurality of circuit states is set as the circuit state of the machining power supply, determine whether or not the set circuit state is normal; a failure portion specifying unit configured to specify a failure portion of the machining power supply based on a determination result with respect to each of the plurality of circuit states obtained by the state determining unit; and a reporting unit (a display unit or the like) configured to report the failure portion specified by the failure portion specifying unit to an operator.

Electrical discharge machine and failure determining method

A wire electric discharge machine with tension monitoring function comprising a tension generation unit configured to generate tension in the wire electrode, a first tension measurement unit set on the wire electrode and configured to measure tension, and a tension control unit configured to feedback tension value measured by the first tension measurement unit and output tension command value to the tension generation unit such that the tension value is equal to a target value, wherein a warning signal is configured to be generated when the tension command value output by the tension control unit is not within a set range corresponding to the target value of the tension.

Wire electric discharge machine with tension monitoring function

In a wire electric discharge machine of the present invention, a control variable detection apparatus is an inter-pole voltage detection apparatus and detects an average inter-pole voltage as a control variable correlating with an inter-pole distance. The wire electric discharge machine comprises a machining feed speed calculation apparatus determining a machining feed speed on the basis of a deviation between target voltage set by a target value setting apparatusand the average inter-pole voltage so as to eliminate the deviation. The wire electric discharge machine further comprises a feed speed distribution apparatus and a relative movement apparatus. The inter-pole distance can be kept constant by the relative movement of a wire electrode and a workpiece made on the basis of a command of thus determined machining feed speed.

Wire electric discharge machine operating with constant inter-pole distance

In order to prevent a reduction in the rate of operation and malfunction due to dirt in a machining tank, a wire electric discharge machine configured to perform electric discharge machining in the machining tank is provided with a camera for capturing an image of the inside of the machining tank and determining unit for detecting dirt in the machining tank based on the image captured by the camera. The dirt in the machining tank is detected by the determining unit.

Wire electric discharge machine having function of cleaning inside of machining tank

A machining power supply device for an electric discharge machine performs control to turn on a first semiconductor switching element, which is arranged in series between a DC power supply and a capacitor connected in parallel with a machining gap between an electrode and a workpiece, to charge the capacitor, and turn on a second semiconductor switching element, which is arranged in parallel with the capacitor and connected to a rectifier element, within a period in which the first semiconductor switching element is off.

Machining power supply device for electric discharge machine

An electrical discharge machine of the present invention is provided with a machining tank stored with a machining fluid in which a workpiece is immersed for electrical discharge machining, a reservoir unit configured to store the machining fluid in order to supply to and recover the machining fluid from the machining tank, a machining tank non-storage condition detecting unit configured to detect that the machining fluid is not stored in the machining tank, an addable amount specifying unit configured to specify the amount of the machining fluid stored in the reservoir unit when it is detected that the machining fluid is not stored in the machining tank and specify an addable amount, which is an addable machining fluid amount, based on the capacity of the reservoir unit and the amount of the machining fluid stored in the reservoir unit, and a machining fluid adding unit configured to add the machining fluid in the addable amount or less.

Electrical discharge machine

The upper limit value for the axis feeding speed is set to the maximum speed that can secure the safety in a wire electrical discharge machine. In the case where the level of the process liquid is higher than a predetermined height, however, the upper limit value is made smaller. In order to prevent the process liquid from spilling to the outside of the process tank, the acceleration or the jerk may be changed instead of the axis feeding speed. In the case where the process liquid level is high, it is difficult for the process liquid to spill when the speed is adjusted slowly. In addition, the time constant may be increased or the instruction for speed may be changed from the linear type to the S shape type.

Electrical discharge machine of which axis feeding properties are changeable

In a wire electric discharge machine, a discharge delay time is used to classify the inter-electrode state into three categories; a short-circuit state, small-gap state, and large-gap state. Based on this classification, the magnitude of a machining current supplied from a main discharge circuit is determined. If the discharge delay time is zero (i.e., if no electric discharge is generated) after the lapse of a predetermined time since the start of the application of a machining voltage to an inter-electrode gap by an auxiliary discharge circuit, the inter-electrode gap is determined to be short-circuited by machining chips. Thereupon, a short-circuit machining current is supplied from the main discharge circuit to the inter-electrode gap to remove the machining chips. In this way, establishment of a complete short-circuit state is prevented so that the machining efficiency is improved to increase the machining speed.

Wire electric discharge machine

In a wire electric discharge machine, a control unit is configured to deposit constituents of a wire electrode between a workpiece and a portion to be cut off from the workpiece to bond the workpiece and the portion to be cut off by outputting a signal for making an output voltage of a variable DC power supply lower than during normal machining and the on-time of a second switching element longer than during the normal machining, at least in a part of a machining path.

An electric discharge machining apparatus capable of precisely detecting the electric discharge in a case of performing machining by minute machining energy such as in finish machining. A voltage is applied between a tool electrode and a workpiece by repeating ON/OFF of a switching element to charge a stray capacitance between the electrodes to cause electric discharge between the electrodes by the charged voltage. The electric discharge between the electrodes in the electric discharge machining by the minute machining energy is detected. The current between the electrodes is detected by integrating an output of a sensor coil. An offset component superposed in the output of the integrator by a low-pass filter is extracted. The extracted offset component is eliminated from the output of the integrator by a differential amplifier. An output of the differential amplifier is compared with a reference value to detect the electric discharge.

Electric discharge machining apparatus

Supply of a wire electrode, application of a detection voltage, and binarization and sampling of the detection voltage are started, so as to start advance of the wire electrode from the position A toward a workpiece. The position of the wire electrode when a sampling value (low level) is detected for the first time is designated as a position B, and the wire electrode is advanced from this position by a predetermined distance P1, and is stopped at a position C. Retreat of the wire electrode is started from the position C, and a position Q where the sampling value has changed from the high level to the low level is stored as a contact/noncontact boundary position. Further, retreat of the wire electrode is continued, and the wire electrode is stopped at a predetermined separating position D, to thereby finish the processing.

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Yamanashi, Japan

Yasuo Nakashima