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| Number | Title | Issue Date |
| 7081757 | Re-locatable partial discharge transducer head An apparatus (10) for detecting the occurrence of partial discharge in electrical equipment, such as high voltage transformers. The apparatus comprises a detecting means including an ultrasonic transducer (11) mounted at one end of an electrically insu... | 07/25/2006 |
| 6933457 | Method and apparatus for electrical discharge machining of a workpiece A method and apparatus for electrical discharge machining of a workpiece wherein an erosion pulse is applied on the tool electrode. During the time of the erosion pulse the voltage (Ue) set on the electrode is acquired, and the erosion pulse is interrupte... | 08/23/2005 |
| 6907311 | Electrical discharge machining apparatus and electrical discharge machining simulator An electrical discharge machining apparatus includes a simulator. The simulator calculates machining information relating to machining shape at each of several simulated machining depths, when the electrode is moved into a workpiece, until an input machining depth i... | 06/14/2005 |
| 6783795 | Power supply apparatus for discharge surface treatment In a power supply apparatus for discharge surface treatment which uses a green compact electrode as a discharge electrode, allows a pulse-type discharge to take place between said discharge electrode and a workpiece, and forms a film, which is made of an electrode m... | 08/31/2004 |
| 6720516 | apparatus for electric discharge micromachining of a micro-diameter hole An electrode discharge machining apparatus includes a first holder for holding a workpiece to be subjected to electro discharge machining, an electrode provided opposing the workpiece held by the first holder, a capacitor for supplying electric charge to the electro... | 04/13/2004 |
| 6667453 | Electric discharge machining method and apparatus with control of rocking function parameters In an electric discharge machining apparatus for performing machining while relatively rocking an electrode (18) and a workpiece (W) in a plane vertical to a machining feed direction, there is provided an electric discharge state detection device (20) for... | 12/23/2003 |
| 6429396 | Electric discharge processing power supply having a protection network for the switching element A power supply for an electric discharge machine which provides electrical power intermittently for discharge machining in a machining gap formed between an electrode and a work piece. The power supply comprises a direct current power source, a switching ... | 08/06/2002 |
| 6312584 | Method and apparatus for electrochemically machining a workpiece An apparatus for electrochemically machining of a workpiece by means of an electrode has an actuator for setting a gap between the electrode and the workpiece. The apparatus further has a channel for flushing the gap with an electrolyte and a container fo... | 11/06/2001 |
| 6169261 | Apparatus and method for generating an electric discharge for use in the line cutting of a workpiece An apparatus and method is provided for generating an electric discharge in an alternating direction on a workpiece for line cutting of the workpiece. In particular, the apparatus and method allows the benefits of preventing the workpiece from being cut a... | 01/02/2001 |
| 6043447 | Discharge machining apparatus In machining, a short-circuit determination reference time stored in a parameter memory is changed by a short-circuit determination reference time changing device in response to rpm or a rotational speed of a rotating electrode, duration of a short-circui... | 03/28/2000 |
| 5903067 | Power supply apparatus for electric discharge machine A power supply apparatus for an electric discharge machine comprises a first power supply device comprising a high impedance circuit connected in series to a DC power supply unit and a second power supply device comprising a low impedance circuit, intermi... | 05/11/1999 |
| 5872347 | Method and device for controlling discharging current slope of wire cut electrical discharge machine It is a main object of the present invention to improve the drawback of a conventional wire cut EDM which controls the pulse width of discharging current to supply discharge energy under the state of constant current slope. The discharging current slope c... | 02/16/1999 |
| 5847351 | Electrode feeding apparatus for electric-discharge machining An electrode feeding apparatus for electric-discharge machining by discharging between an electrode and a workpiece in order to machine the workpiece includes an occurrence frequency detecting unit for detecting the occurrence frequency of short-circuit c... | 12/08/1998 |
| 5761068 | CAD/CAM apparatus and method providing improved display of machined workpiece A machining path in die sinking electrospark machining is more precisely checked before actual machining by displaying shaded images of a machined surface of a workpiece during and after die sinking electrospark machining, whereby and faulty machining ope... | 06/02/1998 |
| 5496984 | Electrical discharge machine and machining method therefor A method and apparatus for detecting and controlling the operation of an electric discharge machine for machining a workpiece. The machining is conducted by generating pulse discharges at a machining gap formed by a machining electrode and the workpiece o... | 03/05/1996 |
| 5486765 | Insulating condition detecting apparatus for a wire-cut electrical discharge machine An insulating condition detecting apparatus for a wire-cut electrical discharge machine in which insulation between a wire electrode and a workpiece is detected without rising any other special power source than a power source for machining. A voltage bet... | 01/23/1996 |
| 5399826 | Electric discharge machining apparatus An electric discharge machining apparatus has a pair of carbide formation detectors for minimizing carbide formation and for preventing abnormal discharges from occurring across the machining gap. If the discharge voltage is below a lower reference voltag... | 03/21/1995 |
| 5371334 | Method of electrical discharge machining control by monitoring gap resistance A pair of electrodes are spaced from one another so as to define a gap. One of the electrodes constitutes a workpiece to be machined and the other electrode constitutes a machining tool. To machine the workpiece, groups of electrical discharges are genera... | 12/06/1994 |
| 5324908 | Method of canceling a short circuit in a wire cut electric discharge machine A method of canceling a short circuit in a wire cut electric discharge machine, capable of speedily and surely canceling the short circuit generated in not only the wire advancing direction but also the perpendicular direction to the advancing one. When t... | 06/28/1994 |
| 5254826 | Contact detecting device for positioning relatively movable elements A device for positioning a first and second conductive elements and, in particular, detecting contact at a gap therebetween without causing damage to either element. A pulse voltage, having a low duty, is applied to the gap. The occurrence of a contact is... | 10/19/1993 |
| 5224048 | Electric discharge machine including electrode configuration sensor An improved electric discharge machine with a numerical control unit includes an electrode configuration sensor in a machining vessel for detecting the configuration of a machining electrode before an electric discharge machining operation is conducted. A... | 06/29/1993 |
| 5171956 | Electric discharge machine capable of preventing electrolytic corrosion attributable to a short-circuit detecting voltage A wire-cut electric discharge machine is provided, which is capable of preventing electrolytic corrosion of a workpiece attributable to an application of a short-circuit detecting voltage which is applied from a short-circuit detecting circuit in between ... | 12/15/1992 |
| 5051554 | Electric discharge machine An electric discharge machine minimizes a recovery period of time by obtaining an optimum direction of movement for eliminating a short circuit based on data stored concerning the configuration (i.e. shape) of the electrode, the current position of the el... | 09/24/1991 |
| 4880957 | Wire-cut electrical discharge machine with electric shock preventer A wire-cut electrical discharge machine having a device for preventing an accident due to an electrical shock, wherein a guide roller (34a) disposed just before a collection box (38) for collecting a used electrode wire (30) passed through an electrospark... | 11/14/1989 |
| 4825029 | Spark erosion system for reducing the height of a honeycomb seal An apparatus for machining metal substrates such as honeycomb seals is provided. The apparatus includes a spindle unit including a motor and shaft. The motor is used for rotating the spindle shaft about its longitudinal axis. The spindle shaft is connecte... | 04/25/1989 |
| 4798929 | Wire electric discharge machining apparatus A wire electrical discharge machining apparatus capable of adequately ascertaining whether the condition of the machining gap is good or bad without lowering the machining speed while preventing damage to the wire electrode. The apparatus includes a high-... | 01/17/1989 |
| 4733040 | Method for the controlled withdrawal movement of an electrode in an electroerosion machine To eliminate short-circuits between a countersink electrode and a workpiece during countersink erosion, when a short-circuit occurs, the countersink electrode is initially moved back by a predetermined path length (δ) along the previously travelled path ... | 03/22/1988 |
| 4733058 | Fail transistor detection and display system for electrical discharge machining apparatus An EDM circuit that detects power transistor switch failure. A comparator 62 and a sample and hold stage 60 are used during a window of time formed by the off-time of a pulse generator to determine whether power switch MOSFET 30 is conducting. If MOSFET 3... | 03/22/1988 |
| 4731514 | Method for predicting breaking of wire electrode in wire electrode type electric discharge machining operation In a wire electrode discharge machining method the breaking of the wire electrode is positively detected by detecting a discharge signal between the wire electrode and the workpiece over a predetermined unit period of time, and then monitoring the average... | 03/15/1988 |
| 4628173 | Fabricating machine A fabricating machine in which a machining tool or electrode is used to machine a workpiece and is subsequently moved relative to the workpiece in a direction perpendicular to the tool or the electrode machining direction in a circular motion relative to ... | 12/09/1986 |
| 4614854 | Wire EDM control circuit for rough and finished machining A wire EDM circuit uses a references voltage connected to a short circuit detector for comparing an average voltage with a reference voltage. Whenever the average voltage is below the reference voltage the numeric controller causes the pulse oscillator to... | 09/30/1986 |
| 4608476 | Retraction control for 3D-path controlled generic electrode electroerosion In a generic-electrode NC-EDM process, the electrode tool oriented in the direction of a z-axis is translationally retracted, from a position of a defective gap condition on a prescribed two-dimensional feed path in an x-y plane, by a prescribed distance ... | 08/26/1986 |
| 4602142 | Electric discharge system including means to normalize the interpole gap to minimize abnormal discharge conditions A voltage sensor senses the gap voltage between an electrode and a conductive workpiece and compares it to a reference voltage using a comparator amplifier. The output from the comparator amplifier is used by an oil hydraulic servomechanism to raise and l... | 07/22/1986 |
| 4590353 | Electric discharge machining power source In an electric discharge machining power source having a capacitor discharge circuit with a switching element, charging of a capacitor is stopped through an OR gate (G1), a NOR gate (G2) and a preamplifier (A1) in response to an output from a charge volta... | 05/20/1986 |
| 4582974 | Electric discharge machine including means for detecting abnormal discharge conditions In an electric discharge machine including an electrode and a workpiece installed opposite each other with an insulating working liquid filling the gap therebetween and which is used to machine the workpiece by causing an electric discharge across the gap... | 04/15/1986 |
| 4578555 | Fail-safe machine tool operational setting system with prerecorded verbal instructions A safety system for a machine tool, e.g. an EDM machine, having a multiplicity of different items of setting procedure to be attended to manually and inspected by the operator before the machine is actuated for performing a given machining operation, empl... | 03/25/1986 |
| 4567342 | Method and apparatus for controlling direction reversal in electric discharge machines A system for reversing the direction of an electric discharge machine in response to a short-circuit signal. A controller responds to the short circuit signal by generating a command signal with a magnitude greater than a stored error between a commanded ... | 01/28/1986 |
| 4514611 | Method of controlling electric discharge machine Disclosed is a method of controlling backward movement in an electric discharge machine wherein a workpiece is subjected to electric discharge machining by moving an electrode and the workpiece across which a voltage is applied, relative to one another. T... | 04/30/1985 |
| 4510364 | Electric discharge machining apparatus In an electric discharge machining apparatus for machining a workpiece by confronting an electrode and the workpiece through an insulating machining solution, feeding the electrode to the workpiece and causing electric discharge between the confronting el... | 04/09/1985 |
| 4510365 | Electronic depth controller for EDM apparatus EDM apparatus has a servo drive under the control of a main control system for advancing a machining electrode toward a conductive workpiece. When the electrode arrives at a surface of the workpiece to commence EDM machining, the main control system cause... | 04/09/1985 |
