B23H 1/00 - Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
2.
Method and apparatus for controlling an electric discharge machining process
A method for controlling an electric discharge machining process, wherein a tool electrode is moved relatively to a workpiece with a working gap distance, wherein the process includes a current and at least one previous erosion cycle, the current and the previous erosion cycle each being divided into predetermined time intervals each including at least one discharge pulse, wherein similar working gap conditions are present within a time interval of the previous erosion cycle and of the current erosion cycle, and wherein subsequent erosion cycles are separated by a process pause cycle.
Electron discharge machining method and device whereby a work piece (2) is machined using a tool (1) along a machining front which retreats ahead of the tool under the effect of spark erosion. The work piece and the tool are separated from one another by a machining gap. A cyclic sequence of voltage pulses (Uign) is applied between the tool and the work piece in order to generate the sparks used for erosion. The tool is moved along a number of axes (3, 4, 15) relative to the work piece. The sparks used for erosion are separated from one another by pauses (TS). A parameter (TDmoy) representative of the width of the machining gap is measured (7, 10, 11 ) in real time. The method and the device are characterized in that the variations in the width of the machining gap are countered by means of a permanent control loop (5, 7, 10, 11, 16, 20, 9, 6, 5) which governs the mean machining power (Pmoy) in accordance with a continuous law which makes the pause (TS) dependent on the parameter that represents the width of the machining gap (TDmoy). Said internal loop does not cause any change in axis. By virtue of these features, an electron discharge machining method and device are obtained that have very rapid, almost instant, control, thus eliminating the defects caused by mechanical inertia.
B23H 7/04 - Apparatus for supplying current to working gapElectric circuits specially adapted therefor
B23H 7/18 - Electric circuits specially adapted therefor, e.g. power supply for maintaining or controlling the desired spacing between electrode and workpiece
4.
METHOD AND DEVICES DESIGNED TO TREAT DEFECTS OF THE RESIDUAL WHITE LAYER LEFT BY THE ELECTRICAL DISCHARGE MACHINING PROCESS
The invention is related to asurface treatment method employing electrical discharges, of which the parameters are chosen so as to minimize the removal of material and to counteract the phenomenon of localization, discharges which strike in an intermediate space between a tool-electrode and a part- electrode, or gap, filled with a dielectric liquid and enabling defects to be eliminated associated with the residual white layer produced by electrical discharge machining during resolidification of part of the material melted by the erosive sparks and to obtain, at the surface of part-electrode, a non-crystalline amorphous structure that can replace all or part of 15 said white layer, said method being characterized by the use of two types of powder, the first type consisting of nanometric sized particles, the second type consisting of micrometric sized particles, and the size distributions of the 8particles of the first and second types being different.
The invention relates to a method and generator for generating a time sequence of EDM pulses having a predefined ignition voltage for electrical discharge machining. An AC voltage is generated from a DC voltage, furnished by a bipolar current source. The AC voltage is applied to an isolating transformer disposed between the bipolar current source and the spark gap. A first pulse capacitor is charged by the bipolar current source to a voltage corresponding to the ignition voltage. The ignition voltage provided by the isolating transformer is switched with a selected polarity to the spark gap.
A method of operating a machine tool, e.g., an electrical discharge machine, and a machine tool system with a machine, e.g. an electrical discharge machine, for machining a workpiece may include numerous configurable modules (DRIVE; GEN; CONTROL) to perform at least one of controlling, monitoring and carrying out of the machining of a workpiece. The modules (DRIVE; GEN; CONTROL) are arranged on the machine and are linked by a data network to a node for at least one of sending data to the node and receiving data from the node.
G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)
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