A tool changer for electrical discharge machine tool, in particular for loading and unloading at least one tool electrode holder to be mounted in a chuck of the electrical discharge machine tool for machining a workpiece. The tool changer includes
a base having a back wall and two side walls, wherein on each side wall a linear guide is provided horizontally;
a holding plate coupled to the linear guide to allow the displacement of the holding plate on a horizontal plane on the linear guide in its longitudinal direction defined as extending direction;
a plurality of forks for receiving the tool electrode holder mounted on the holding plate;
a driving unit connected to the holding plate to enable the movement of the holding plate between a retracted position and an extending position, wherein in the retracted position the holding plate is positioned closely to the back wall and in the extending position the holding plate is moved away from the back wall, wherein the driving unit includes a first actuator and a second actuator, the longitudinal axis of each actuator being arranged at a defined angle to the extending direction of the tool changer.
B23H 11/00 - Auxiliary apparatus or details, not otherwise provided for
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
A method for electrical discharge machining (EDM) a workpiece by means of a train of machining pulses. During the machining time the machining pulses are applied to the working gap between workpiece and electrode.
A method for electrical discharge machining (EDM) a workpiece by means of a train of machining pulses. During the machining time the machining pulses are applied to the working gap between workpiece and electrode.
An open voltage is first applied, the ignition delay time td is measured, then, at the beginning of the discharge, its fall time tf is measured, and certain shape features (e.g. the pedestal and ramp) of the pulse are adapted in real time for the very same discharge, as a function of said ignition delay time and/or fall time. Moreover, instead of shaping the very same discharge, one or more subsequent discharges can be shaped as a function of td and/or tf of a single discharge, or of an average of td and/or tf over several discharges.
The invention relates to a method and device for wire electrical discharge machining (WEDM), in which a first voltage UCH1 is measured between a first current feeder and the workpiece, and a second voltage UCH2 is measured between a second current feeder the workpiece, whereas said first- and second voltage UCH1, UCH2 are measured when current of the machining discharge pulse is zero, for instance at the end of the of the machining discharge current pulse, and a voltage difference of said measured voltages ΔUCH=UCH1−UCH2 is determined, and a discharge position of said machining discharge pulse is determined in real time, as a function of said voltage difference ΔUCH.
The present invention is related to a wire electrical cutting machine for machining a circular part by a wire electrode. The machine comprisesa machine base (10);a column (20) mounted on the machine base;a first rotary axis unit for rotating the part around a first rotary axis (C), wherein the first rotary axis is mounted on the column and the first rotary axis is arranged hor-izontally;a machine table (30) bearing a wire traveling circuit (40), which includes a first wire guiding head (41) and a second wire guiding head (42) and the wire electrode (45) traveling between the first wire guiding head and the second wire guiding head, in particular in one direction; anda first linear axis unit (12) for linear movement of the machine table in a first linear axis direction and a second linear axis unit (11) for linear movement of the machine table in a second linear axis direction, wherein the first linear axis unit is mounted on the machine base and the second linear axis unit is mounted on the first linear axis unit and the machine table is mounted on the second linear axis unit, wherein the first- and the second linear axes are arranged orthogonally with respect to each other and orthogonally with respect to the first rotary axis;wherein the wire electrode is positioned below the first rotary axis to machine the part.
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
The invention relates to a method and device for electrical Wire electrical discharge machining method (WEDM) for forming a desired pattern on a workpiece by a WEDM machine tool, in which a preliminary voltage pulse is applied to a gap between a wire electrode and a workpiece, and in which, at the breakdown of said preliminary voltage pulse, a first machining discharge pulse is applied to the wire electrode.
A method and device for electrical discharge machining (EDM) a workpiece by means of a train of machining pulses. During the machining time the machining pulses are applied to the working gap between workpiece and electrode. An open voltage is first applied, and it is increased to a second open voltage level if a discharge does not occur within a waiting time d0, and further increased to a third open voltage level if a discharge does not occur within a second waiting time d1.
A method and device for electrical discharge machining (EDM) a workpiece by means of a train of machining pulses. During the machining time the machining pulses are applied to the working gap between workpiece and electrode. An open voltage is first applied, and it is increased to a second open voltage level if a discharge does not occur within a waiting time d0, and further increased to a third open voltage level if a discharge does not occur within a second waiting time d1.
An average product of the actual open voltages times the partial ignition delays is computed and subtracted from the product of a reference open voltage times the total ignition delay, and the servo setpoint value is adjusted accordingly. The actual axes positions are sampled in real time and the discharge electrical parameters are adjusted accordingly. The discharge electrical parameters can be adjusted according to the duration of d0 and d1.
B23H 7/18 - Electric circuits specially adapted therefor, e.g. power supply for maintaining or controlling the desired spacing between electrode and workpiece
B23H 7/20 - Electric circuits specially adapted therefor, e.g. power supply for programme-control, e.g. adaptive
High-speed wire electrochemical-discharge cutting method (HS-WECDM), in which a work piece is processed by means of a wire electrode, in which consecutive negative polarity pulses are applied at said wire electrode, thereby at least partially developing discrete electrical discharges, wherein the method further includes, applying positive polarity pulses at the wire electrode between the negative pulses, and that an ignition occurring with each positive polarity pulse is immediately detected, and that the positive polarity pulses are immediately interrupted.
A high-speed reciprocating wire cutting process in which a wire electrode is transported and precisely guided across a machining area by means of a wire traveling circuit, whereas the cutting process is conducted by repeatedly: (a) running the wire electrode in a first direction until a first reciprocation position, (b) stopping and inverting the traveling direction of the wire electrode, (c) running the wire electrode in a second direction until a second reciprocation position, and (d) stopping and inverting the traveling direction of the wire electrode.
W is adapted in-process, while cutting. The method includes, determining the size of the crater occurring at each said determined position of each discharge along the engagement line of a wire and a work piece, and the current wire traveling speed; and continuously comparing the wire wearing model with one or more wire wearing limits, and adjusting the wire traveling speed according to the comparison of the actual wire wearing model and the one or more wire wearing limits. The wire electrical discharge machining process is conducted with reduced wire consumption, safely, efficiently and profitably.
B23H 7/20 - Electric circuits specially adapted therefor, e.g. power supply for programme-control, e.g. adaptive
G05B 19/19 - Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
A method for the monitoring of a wire electrical discharge machining (WEDM) process, the method comprising the steps of: setting a unit observation length for the signal acquisition, continuously acquiring at least one process signal which is representative of an amount of material removed by at least one discharge and the position (X;Y) of said at least one discharge, and determining, based on said at least one process signal and one or more properties of a current machining, a cumulated amount of material removed per unit observation length along a machining path, including amounts of material removed by travelling in a forward cutting direction and amounts of material removed by travelling in a reverse cutting direction.
A method for preprocessing data related to a tool electrode, which is applied in an EDM machine to manufacture a part comprises: generating an electrode model for the tool electrode based on the geometry of the part; generating the cavity shape model (volume of the part to erode), combining the electrode and cavity shape model, dividing the resulting model into a plurality of slices in a plurality of parallel planes, wherein at least one slice is composed of at least two sections, which are topologically disconnected; and generating for each slice a slice-geometry data, and generating an electrode-geometry data including the slice-geometry data.
B23H 7/18 - Electric circuits specially adapted therefor, e.g. power supply for maintaining or controlling the desired spacing between electrode and workpiece
B23H 7/26 - Apparatus for moving or positioning electrode relatively to workpieceMounting of electrode
A method for the mechanical correction of geometric motion errors of a positioning machine having at least two machine frame components and at least one axis movement assembly for the relative movement of the machine frame components, the at least one axis movement assembly comprising a plurality of axis guide components, each axis guide component and each machine frame component having a mounting surface. A mounting surface correction profile is determined for the considered axis, whereas the mounting surface correction profile describes the correction amounts in function of the position for the mechanical correction of the considered axis. The determined mounting surface correction profile is imparted to the mounting surface of the axis guide component or to the mounting surface of the machine frame component of the considered axis by machining.
The present invention is directed to a method for mitigation of the damages in case of accidental collisions in a machine tool comprising a computer numerical control (CNC) and a plurality of axes, wherein the occurrence of collisions is monitored, comprises: identifying a first axis being an axis at which a collision is first detected, identifying a second axis being an axis parallel to said first axis, and determining if both or one or none of the axes are resting. If both are resting unlocking the first axis or both axes. If the first axis or second axis is not resting, then the moving axis is defined as the collider, and said moving axis is braked, and simultaneously the resting axis is unlocked or stepped away or held in position. If both axes are moving, defining a collider axis based on said identified first axis at which a collision has been first detected, braking said collider axis and simultaneously unlocking or stepping away the axis parallel to said collider axis.
G05D 3/12 - Control of position or direction using feedback
G05B 19/19 - Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
The present invention is directed to a current feeding device for the supply of electrical current to a wire electrode traveling in an electro-erosion machine during the machining operation. The current feeding device comprising: a rotary electrically conductive body which is in contact with the wire electrode; at least one bearing for supporting the rotary electrically conductive body at one side; and a brush for electrically contacting the rotary electrically conductive body and for supporting the rotary electrically conductive body at the other side of the body and opposite side to the bearing. The brush is at the rotary axis of the rotary electrically conductive body.
The invention provides a method for machining a shape such as slot or cavity or aperture using a plurality of first type holes (1) and second type holes (2), wherein during machining of first type holes (1) the hole circumference completely envelopes the respective portion of the electrode circumference.
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
B23H 7/26 - Apparatus for moving or positioning electrode relatively to workpieceMounting of electrode
A method for machining a shape suah as slot using a plurality of first type holes and second type holes, wherein during machining of first type holes the hole circumference completely envelopes the respective portion of the electrode circumference; wherein during the machining of second type holes, the hole circumference only partially envelopes the respective portion of the electrode circumference; wherein the second type hole at least connects or provides opening to a first type hole; wherein two adjacent first type holes are only connected through a second type hole to form a shape; wherein the holes may be blind holes or through holes.
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
B23H 11/00 - Auxiliary apparatus or details, not otherwise provided for
B23H 1/02 - Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
G05B 13/02 - Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
G05B 19/042 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
A method for the determination of lifetime of a filter of an electric discharge machine the electrical discharge machine in consideration of a maximum allowable filter pressure, wherein the time measuring unit counts the machining time ts during which an electric discharge machining process is running, a filter pressure sensor measures the filter pressure p(k), preferably with a predetermined sampling interval, the pressure measurement p(k) and the respective sampling time t(k) are stored, and the sampled measurements p(k) and the respective sampling times t(k) are used to determine the parameters of an exponential function which best fits to the plurality of sampled measurements regression analysis. The determined parameters include the filter lifetime tf, which serves to determine the residual time to the filter replacement tr and/or the calendar deadline of filter expiration.
B23H 7/20 - Electric circuits specially adapted therefor, e.g. power supply for programme-control, e.g. adaptive
B01D 29/60 - Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups Filtering elements therefor integrally combined with devices for controlling the filtration
A device for identifying a spark-erosion wire conditioned on a coil includes a radio tag, rigidly connected to the coil and accessible for reading data that it supports, identification data of the wire, supported by the radio tag, a data-reading device, associated with a wire spark-erosion machine, capable of reading the identification data supported by the radio tag of the coil, and capable of transmitting the identification data to the wire spark-erosion machine, an acquisition device for generating and recording over time as identification data, in the radio tag, historical data selected from the group that consists of historical usage data describing usage conditions of the wire supported by the coil and historical constraint data describing physical constraints to which the wire supported by the coil is subjected.
A method for the machining of workpieces (11) and inspection of the processed workpiece surface in a machine tool (1), preferably a die sinking electrical discharge machine. The method uses at least one machining process interruption during which the processed surface of the workpiece (11) is inspected. Within said machining process interruption, at least one image of the processed workpiece surface is captured on the machine tool (1) by means of a digital camera (12). The images are processed by one or two pattern recognition algorithm (PRA D, PRA S), which were previously trained to determine the surface characteristics such as roughness parameters, functional surface features and/or characteristic defects of the processed workpiece surface captured on that at least one image. The determined surface characteristics are used to resume the processing of the workpiece surface with or without adjusting the processing parameters.
B23H 1/02 - Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
B23Q 17/24 - Arrangements for indicating or measuring on machine tools using optics
G01B 11/30 - Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
B23H 11/00 - Auxiliary apparatus or details, not otherwise provided for
B23Q 3/157 - Arrangements for automatic insertion or removal of tools of rotary tools
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
A linear shaft motor (1) has a slider (10) and a tubular magnetic shaft (30). The slider (10) includes an oblong cuboid shaped motor housing (101) having a rectangular cross-section with a longitudinal central bore (180). The motor housing (101) includes at least two longitudinal cooling holes (161, 162, 163, 164, 165, 166, 167, 168) which are part of an integrated fluid cooling circuit. The at least two longitudinal cooling holes (161-168) are distributed symmetrically at a left and at a right side of the central bore (180), whereas the central axis (15) of any of the longitudinal cooling holes (161-168) lays below the topmost portion (20) of the central bore (180) and above the lowermost portion (25) of the central bore (180).
H02K 5/20 - Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
H02K 9/10 - Arrangements for cooling or ventilating by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing
H02K 9/22 - Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
H02K 41/03 - Synchronous motorsMotors moving step by stepReluctance motors
B23H 11/00 - Auxiliary apparatus or details, not otherwise provided for
H02K 9/19 - Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
24.
Device for threading the wire electrode of a wire electrical discharge erosion machine
A threading nozzle for threading a wire electrode for a threading device in a wire electrical discharge erosion machine includes a threading-nozzle body having a guide bore configured to guide the wire electrode along a longitudinal axis of the former and a gap that splits the threading-nozzle body in two parts which are connected at a flexural hinge configured in the threading-nozzle body. The gap splits the guide bore in two parts.
A wire electric discharge machine for machining a workpiece includes a handling device for handling core pieces produced by the machine during the machining of the workpiece and upper and lower wire guiding heads moveable with respect to each other and with respect to the workpiece. The handling device includes a gripper mounted in a fixed or movable relation to the upper wire guiding head. The gripper moves so as to face a produced core piece with its gripper base. The gripper includes a fluid inlet where fluid flow under positive pressure enters the gripper and a fluid outlet at the gripper base where the fluid flow exits the gripper. An interior of the gripper guides the fluid flow, producing a low pressure region at the gripper base as the fluid flow exits, generating lifting force to remove the produced core piece from the workpiece by movement of the gripper.
B23H 7/10 - Supporting, winding or electrical connection of wire-electrode
B23Q 7/04 - Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of grippers
B23H 9/12 - Forming parts of complementary shape, e.g. punch-and-die
B23H 11/00 - Auxiliary apparatus or details, not otherwise provided for
B23Q 7/00 - Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
27.
Method and pulse-forming device for electrical discharge machining
A method for electrical discharge machining a work piece using rectangular processing pulses includes forming the rectangular processing pulses by discharging one or multiple discrete delay lines that comprise multiple storage elements. The storage elements are arranged as part of a feed line to a spark gap on a section of the feed line near the spark gap. The discrete delay lines are connected to a guide head by an electrode-side contact unit and are connected to the work piece by a work piece-side contact unit.
The invention relates to a method for electrical discharge machining of workpieces by electrical discharge pulses generated by a power module of an electrical discharge machine. The invention is characterized in that firstly the discharge voltage of a number N1 of electrical discharge pulses is acquired and stored, secondly a front discharge voltage (63) is determined out of this amount of N1 acquired discharge voltages and thirdly, the voltage Uhps (64) of the electrical discharge pulses produced by the power module for machining the workpiece (17) is adjusted in function of the determined front discharge voltage (63).
B23H 7/04 - Apparatus for supplying current to working gapElectric circuits specially adapted therefor
B23H 7/16 - Electric circuits specially adapted therefor, e.g. power supply for preventing short circuits or other abnormal discharges
B23H 7/18 - Electric circuits specially adapted therefor, e.g. power supply for maintaining or controlling the desired spacing between electrode and workpiece
B23H 1/02 - Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
The invention relates to a pulse generator module (50) for electric discharge machines which comprises a generator enclosure (51) containing printed circuit boards (PCBs), wherein at least one of the PCBs is a generator board (52). The PCBs (52) are all arranged in one plane.
An expansion of known serial data links, for example ETHERNET, published in IEEE802.3, for directly transmitting random events without having to carry out synchronization with a clock signal or having to wait for a cyclical transmission time. Two different, random events are represented using two differently coded individual pulses and are transmitted in an event-controlled manner. A jitter-free latency of 45 ns between the event and its reception is possible over a line length of 8 m, for example. The expansion is particularly suitable for the short, digital data links between a node and a plurality of modules, as are required in modern electrical discharge machines, machine tools and similar electronic systems.
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
32.
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.
A method for electrical discharge machining a workpiece includes dividing machining time into a sensing interval during which reference values are captured from machining pulses and into a machining interval during which no reference values are captured. The sensing interval includes either a first sensing interval after implementation of a jump motion of the electrode in the working gap or a second sensing interval after application of an extended pause time to at least some of the machining pulses. The extended pause time is longer than a pause time of other ones of the machining pulses. The method also includes sensing an electrical parameter of a current machining pulse and deriving at least one characteristic value from the sensed electrical parameter. The method further includes comparing characteristic value to at least one of the captured reference values and initiating an action depending on a result of the comparison.
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.
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