Abstract: 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, and it is increased to a second open voltage level if a discharge does not occur within a waiting time do, and further increased to a third open voltage level if a discharge does not occur within a second waiting time d1. The discharge electrical parameters can be adjusted according to the duration of d0 and d1.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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).

Abstract: 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).

Abstract: 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.

Abstract: The application refers to a wire electrode (3) for electrical discharge machines. The inventive wire electrode includes a core (1)—preferably made of copper, brass, molybdenum, tungsten or steel—and a coating (2), which contains according to the invention graphene.

Abstract: The invention relates to electrical discharge milling machines using tool electrodes subject to longitudinal wear. The inventive discharge milling machine is equipped with a numerical controller executing at least one control cycle for compensating the wear considering the following steps: (a) determining the volume Q eroded by each discharge, (b) calculating the distance s travelled by the tool from one effective discharge to the next, (c) calculating the actual eroded linear volume M [m3/m] for at least one effective discharge, M forming a measurement sample from the values Q and s, (d) comparing said sample M with the corresponding set value C to generate an error D=C?M [m3/m], and (e) calculating and transmitting a command by the numerical controller intended to reduce this error D during the following cycle or cycles.

Abstract: A method for cutting by a traveling wire, wherein the wire traveling direction of the wire and/or the workpiece are/is inclined alternately in relation to one another into at least two different specific angular positions in the cutting direction, with the result that the effective cutting height (s) on the workpiece (2) becomes smaller than the entire workpiece height.

Abstract: Device for managing the electrodes for electrical discharge machining EDM machine tools comprises at least one magazine (1) that has a series of individual housings (33) designed to accept and hold exchangeable elements (5) consisting of electrodes (6, 22) mounted on an electrode holder (11a, 11b), and a changer device (2) equipped with a gripper (2) intended to move the exchangeable elements (5) from the individual housings (33) towards the machine and vice versa. A first adapter piece (21) is associated with each of the exchangeable elements (5). This adapter piece (21) surrounds the electrode holder (11a, 11b) and is gripped around its periphery by the gripper (9) of the changer (2) so as to guarantee that the exchangeable element (5) is held precisely. The device further comprises a second adapter piece (32) associated with each of the individual housings (33) of the magazine (1) that are likely to be used.

Abstract: 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.

Abstract: A method and machine to allow for the spark-erosion machining of parts, in particular their finishing, using cylindrical or tubular tools by successive layers.

Abstract: A method for cutting by a traveling wire, wherein the wire traveling direction of the wire and/or the workpiece are/is inclined alternately in relation to one another into at least two different specific angular positions in the cutting direction, with the result that the effective cutting height (s) on the workpiece (2) becomes smaller than the entire workpiece height.

Abstract: 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.

Abstract: A method for controlling a wire electric discharge machine comprising the steps of: determining of at least one predefined contour deviation (Esmax) of a predefined contour to be cut into the workpiece; determining a curvature of at least one geometry element defining at least one section of the contour to be cut into the workpiece; calculating a displacement (s) of an upper guide (WGU) and a lower wire guide (WGL) based on the predefined contour deviation (Esmax) and on the curvature of the at least one predefined geometry element; and setting the displacement (s) by moving the upper guide (WGU) relative to the lower wire guide (WGL) such that the wire electrode guided by the upper (WGU) and lower wire guides (WGL) is inclined in a current cutting direction of the workpiece during cutting of the geometry element into the workpiece.

Abstract: The methods and devices enable a reliable and rapid automatic threading process on spark-erosive wire-cutting machines with closed round guides without complicated entry of parameters. A heat-output control device with an optimized output characteristic curve is supplied from a DC voltage source of the erosion generator. Through an at least partial feedback loop of heating current and source voltage, the characteristic curve is modified in such a way that different wire types or different annealing lengths for the wire provide optimal results for stretching, straightening and separating the wire electrode without controlled intervention. With adaptive control it is possible to thread future wire types automatically without reprogramming.