Abstract: A positioning apparatus for an electrical discharge machine includes: a power supply 106 for applying a pulse voltage between an electrode 101 and a workpiece 102; a discharge detecting means 1108 for detecting the occurrence of electrical discharge between the electrode 101 and the workpiece 102; and a means for generating a positioning completion signal on the basis of a detection signal from the discharge detecting means 1108.

Abstract: An electric-discharge machining apparatus for machining a workpiece by an electric discharge generated between a machining electrode and the workpiece, includes a correcting unit that corrects a machining amount input for machining the workpiece, based on a usage history of the machining electrode; and a control unit that controls a machining processing on the workpiece based on the machining amount corrected.

Abstract: A discharge electrode comprising a material having solid lubricant effect, such as molybdenum, is used to generate discharge in a pulse form between the discharge electrode and a workpiece, the surface of which is to be treated, in working liquid containing carbon components, such as water. Material consumed or melted from the discharge electrode, generated because of the electric discharge energy based on the pulse form discharge, gets adhered to and deposited onto a surface of the workpiece thereby forming a coat having lubricant effect on the surface of the workpiece.

Abstract: A jump control apparatus for an electric discharge machine ensuring high machining precision while reducing machining time by removing sludge speedily, regardless of differences in shape among workpieces, includes a feed control unit for controlling a vertical position of an electrode relative to a workpiece, a jump condition estimating unit for estimating jump conditions for the electrode for removing the sludge between the electrode and the workpiece during machining. The jump conditions generated are input to the feed control unit. The apparatus includes an input unit for inputting machining conditions relating to the jump conditions in precedence to machining, and a numerical control unit for determining various parameters in dependence on the machining conditions. The parameters are input to the jump condition estimating unit for estimating the jump conditions through feed-forward control using the parameters.

Abstract: A discharge pulse generator for supplying power between a pair of electrodes (1 and 2), comprises a distribution constant line (8) of a predetermined length being connected at one termination to the electrodes (1 and 2), charging means (16) being connected to the distribution constant line (8) for charging the capacitance of the distribution constant line (8), rectification means (13) being connected to an opposite termination of the above-mentioned distribution constant line (8) in a direction in which no current flows relative to voltage of the above-mentioned charging means (16), and a resistor (10) being connected in series to the above-mentioned rectification means (13) and having a resistance value equal to the characteristic impedance of the above-mentioned distribution constant line (8). For example, to use the discharge pulse generator for electric discharge machining, a workpiece can be worked on with higher accuracy and higher quality at higher speed.

Abstract: A discharge surface treatment device, which forms a modified layer on a metal surface by generating a discharge between an electrode composed of a modifying material or a material that is a source of the modifying material and metal that is a material to be surface-treated, has an arrangement in which: a plurality of electrodes, each of which is insulated from each other, are placed, each of the electrodes is connected to a power-source device exclusively used for the corresponding electrode so that each of the electrodes is supplied with a discharging pulse independently from the corresponding power-source device.

Abstract: A jump control apparatus for an electric discharge machine capable of ensuring high machining precision while reducing machining time by removing sludge speedily regardless of differences in shape among workpieces includes a feed control unit (7) for controlling a vertical position of an electrode (1) relative to a workpiece (2), a jump condition estimating unit (8) for estimating jump conditions for the electrode (1) for removing the sludge occurring between the electrode (1) and the workpiece (2) during machining. The jump conditions generated are inputted to the feed control unit (7). The apparatus includes an input unit (10) for inputting machining conditions relating to the jump conditions in precedence to machining, and a numerical control unit (11) for determining various parameters in dependence on the machining conditions. The parameters are inputted to the jump condition estimating unit (8)for estimating the jump conditions through a feed-forward control performed by using the parameters.

Abstract: A discharge pulse generator for supplying power between a pair of electrodes (1 and 2), comprises a distribution constant line (8) of a predetermined length being connected at one termination to the electrodes (1 and 2), charging means (16) being connected to the distribution constant line (8) for charging the capacitance of the distribution constant line (8), rectification means (13) being connected to an opposite termination of the above-mentioned distribution constant line (8) in a direction in which no current flows relative to voltage of the above-mentioned charging means (16), and a resistor (10) being connected in series to the above-mentioned rectification means (13) and having a resistance value equal to the characteristic impedance of the above-mentioned distribution constant line (8). For example, to use the discharge pulse generator for electric discharge machining, a workpiece can be worked on with higher accuracy and higher quality at higher speed.

Abstract: A detected value indicating a machining state is filtered and a machining gap between an electrode and a workpiece is adjusted by using a control variable obtained through the filtering. Therefore, machining speed can be improved by maintaining a stable machining state through suppression of a disturbance in a gap distance control system due to eccentricity of an electrode, due to fluctuations in electric characteristics at feeding brush sections, and due to mechanical resonance of the electrode driving system.

Abstract: An error signal is obtained from a reference value and a value indicating a detected state in machining, a first controlled variable is obtained by adding a value obtained by multiplying the error signal by a proportion gain to a value obtained by multiplying the error signal by a first integration gain, a second controlled variable is obtained by multiplying an instruction value by a second integration gain for integration, and a value obtained by adding the first controlled variable to the second controlled variable and multiplying the sum by a machining trajectory vector is used as a controlled variable for a driving unit for adjusting a distance between an electrode and a workpiece in discharge machining. Therefore, it is possible to realize a discharge machining control method and apparatus in which the machining speed can be improved by always maintaining the discharge machining process in an optimal state.

Abstract: A discharge electrode comprising a material having solid lubricant effect, such as molybdenum, is used to generate discharge in a pulse form between the discharge electrode and a workpiece, the surface of which is to be treated, in working liquid containing carbon components, such as water. Material consumed or melted from the discharge electrode, generated because of the electric discharge energy based on the pulse form discharge, gets adhered to and deposited onto a surface of the workpiece thereby forming a coat having lubricant effect on the surface of the workpiece.

Abstract: 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-circuit detected between the electrodes is measured by a short-circuit duration time determining device, and a short-circuit evading operation is executed by a short-circuit back control device in a case where the duration of a short-circuit has surpassed the short-circuit determination reference time.

Abstract: An electric discharge machining apparatus and method are provided first having a data storage for storing initial machining conditions such as a two-dimensional outline path for a machined form, dimensions of the machined form, a feed rate in the axial direction of an electrode for a given movement of the tool electrode in the horizontal direction, and an interval period of inline measurement. In addition, the apparatus measures a machining depth at each interval period of inline measurement. The apparatus also computes machining parameters such as a machining depth for each machining pass, a number of remaining passes of machining which are to be executed, and also increments an outline offset according to the measured machining depth. An electrode position control then provides positional control of a tool electrode according to the computed machining parameters.

Abstract: An electric discharge machining apparatus in which at least either of a tool electrode or a workpiece is made of an anisotropic conductive material, includes, on a good conductive surface 20b of the anisotropic conductive material 2, a portion for connecting an isotropic conductive member 22. Electric discharge is generated on the good conductive surface 20b of the anisotropic conductive material 2. A conductive adhesive agent 23 is employed to bond the anisotropic conductive material 2 and the isotropic conductive member 22 to each other. The anisotropic conductive material is a pyrocarbon material. The pyrocarbon heat resolved carbon material is employed as a tool electrode material. Incombustible dielectric fluid, such as pure water, is employed as dielectric fluid.

Abstract: The electrical discharge machining device includes storage apparatus for storing the two-dimensional contour pass of the machined shape formed by the primary machining operation, the dimension of the taper of the side surface of the workpiece to be machined, the amounts of feed of the electrode in a given Z direction with respect to the movements of the electrode in the X and Y direction under respective machining conditions; information adding apparatus for adding offset information to the above-mentioned contour pass; machining operation number calculating apparatus, in accordance with a previously obtained machining depth per round about an electrode pass, for calculating the number of machining operations to be repeatedly executed around the electrode pass until a target depth is obtained; offset displacement amount calculating apparatus for calculating an offset displacement amount per round about the electrode pass in accordance with the length in the above-mentioned side surface direction of the side s