Wire cutting

Support and guiding means for a wire electrode in an electro-erosion machining apparatus comprising a V-block support and guide having two angularly disposed guiding surfaces substantially parallel to the wire electrode longitudinal axis mounted on a base automatically orientable radially about the wire...     

A support and guiding arrangement for a wire electrode for electro-erosion machining apparatus comprising at least a bearing surface for the wire electrode disposed between the wire guides for damping the vibrations or oscillations of the wire unsupported length in the course of a single oscillation,...     

A generator for machining by means of electrical discharges between a tool electrode and a workpiece electrode. The generator consists of a main voltage source connected between the tool electrode and the workpiece electrode through an improved switching circuit which is activated by an adjustable oscillator....     

A traveling-wire electrical machining system with improved accuracy results by providing, in addition to the usual electrode guide arms straddling the workpiece and by which the electrode is sharply deflected in its path from the supply coil to the backup coil, a second pair of arms guiding the stretch...     

An arrangement for connecting the terminals of the pulse generator of an EDM apparatus across an electrode wire and an electrode workpiece for effecting a cut applied in the machining zone between the electrode wire and the electrode workpiece. The machining current pulses are fed across the machining...     

An electrode for machining a workpiece by electrical discharges, the electrode having an active surface comprising at least 50% by weight of a metal or alloy selected from the group consisting of zinc, cadmium, tin, lead, antimony and bismuth. Preferably, the active surface is in the form of a coating...     

In an EDM method, a continuous wire electrode with an original radius is continuously transported through a machining zone of a workpiece. The machining zone is flushed with a liquid while a succession of electrical machining current pulses are passed between the electrode and the workpiece. Because...     

An electric discharge machining apparatus for cutting and shaping a workpiece into an article having a desired configuration in which the period of time required until the speed of a table carrying the workpiece becomes constant is made quite short. Comparator means compares a gap voltage between a wire-shaped...     

A wire or band electrode type electric discharge machine for machining hard metals by an electric spark generated between the metal workpiece and a wire electrode which is fed longitudinally to provide a fresh supply thereof while a prescribed relative motion is established between the workpiece and...     

A correction system for a travelling wire EDM machine cutting a workpiece by means of a travelling electrode wire stretched between two guide members and comprising a pair of servo motors for effecting displacement of the guide members relative to their respective support arms, such as to incline the...     

An automatic cutting condition changeover equipment for automatically changing over an electrical cutting condition of a wire-cut, electric discharge machine in accordance with the thickness of a work. The equipment is provided with a feed control circuit for controlling the cutting speed of the work...     

A wire-cut, electric discharge machine which is provided with auxiliary wire feed means for feeding a wire in a backward direction when the wire is broken, and a wire detector for detecting, at a predetermined position, the extreme end of the broken wire fed in the backward direction. When detecting...     

A wire-cut, electric discharge machine in which a pair of rollers are provided in the vicinity of each of the upper and lower guides of a wire running system for gripping therebetween a wire with constant pressure. When the wire breaks, the pairs of rollers hold the wire to prevent it from coming off...     

In a wire-cut, electric discharge machine equipped with an automatic wire electrode threading mechanism, a straightening guide having a curved surface which guides thereacross a wire electrode while straightening it out. The straightening guide is positioned directly in front of feed-up rollers which...     

A system for converting design information into three-dimensional shapes includes a design information storing and processing apparatus, a controller for converting digital into electrical signals, and a cutter for sculpturing a workpiece into a three-dimensional form. The system enables a designer to...     

A wire-cut, electric discharge machining method in which a wire is inserted into a machining start hole made in a workpiece to start electric discharge machining from the machining start hole, a bushing of a conductive material is pressed into a hole made in the workpiece to provide the machining start...     

A traveling-wire electroerosive cutting method using a worktank filled with a liquid machining medium in which a workpiece is immersed. A continuous wire electrode is transported from a supply unit to a takeup unit to axially travel and thereby traverse the workpiece in a cutting zone defined between...     

A tungsten filament intended as a thermionic source, made from a wire of which the zone defining the point is of a diameter smaller than that of the basal zone and where the diameter of the transitory part of the wire changes progressively. This filament is contained in the same plane and its lower legs...     

The disclosed method and apparatus are related to the machine for and process of cutting a desired contour in a workpiece with an axially traveling elongate tool by relatively displacing the workpiece and the elongate tool transversely to the traveling axis of the latter along a predetermined cutting...     

A method of contour-machining a workpiece by axially transporting an electrode wire through the workpiece while advancing the workpiece relative to the axis of travel of the electrode wire in a plane substantially orthogonal to the axis of travel to electroerosively cut a groove progressively along a...     

Hardmetal lamina are cut, by a process known as electrical discharge machining, from a block of hardmetal using a wire electrode. The laminae so formed may then be attached by adhesive or epoxy resin to a suitable base in order to form a hard metal surfaced tool. Provision is made for preventing this...     

A wire-cut electric discharge machine having an improved nozzle system for supplying working fluid into a working gap between a workpiece and wire electrode. The improved nozzle system comprises a working fluid nozzle coaxial with the wire electrode and an auxiliary nozzle for producing an intense jet...     

In a wire-cut electric discharge machine the accurate thickness of a workpiece is obtained, on the basis of which electric cutting conditions are automatically changed over. The workpiece and a wire electrode are moved relative to each other through utilization of a servo feed system to cut the workpiece...     

An exothermic cutting electrode or burning bar provided with a coating containing oxidizing material, arc stabilizing material and a binder with portions of reduced coating thickness along the length of the electrode.

When cutting workpiece into a desired number of closed loop configurations by means of a wire-cut, electric discharge machine provided with an automatic wire feed mechanism, electric discharge machining is started from a machining start hole made in the workpiece corresponding to each closed loop configuration...     

A gouging wire electrode comprising a metal shell, and a powdery or particulate filler section packed into the metal shell, the composition of the filler section comprising 80-95% by weight of carbon and 5-20% by weight of thermosetting resin binder, the bulk density of the filler section being 1.2-1.7...     

There is disclosed a numerically controlled cutting method of cutting a curved surface SF generated by interconnecting corresponding points mi, ni (i=1, 2, . . . ) on two curved lines CV1, CV2 with a cutter BT of a milling machine having simultaneously controlled five axes or a wire electrode of a wire-cut...     

A wire-cut electric discharge machining apparatus for cutting a workpiece by producing an electric discharge across the workpiece and a wire while a machining liquid is allowed to flow between the wire and the workpiece via machining liquid flow rate control apparatus. When machining speed is reduced...     

An automatic TW (traveling-wire) electroerosion machining system for machining a plurality of workpieces of different types required to acquire different contours includes a TW machine having a wire setting unit and located adjacent a predetermined path. A work dispensing unit successively dispenses...     

A wire electrode for a spark-eroding system for erosion cutting of workpieces using intermittent electrical charges includes a core of a current-conducting material and a wire coating of a material with a lower evaporation temperature, for example zinc. The core consists of one of the following alloys...     

A wire-cut electric discharge machining system is provided with a high-current, short-pulse discharge circuit for producing a high-current, short-pulse discharge between a wire and a workpiece, a low-current, pulse discharge circuit for producing a low-current, pulse discharge between the wire and the...     

A system is disclosed for cutting shapes from slabs of easily machinable material, such as plastic foam, under computer control. These shaped slabs can then be piled and glued together in order to build large complex volumes, to be used as models, molds or cores of fiber-reinforced objects. The slab...     

A wire-cut electric discharge machine, which displays a workable time (T) of a currently used wire electrode (2). A wire length when the wire is mounted on a bobbin (B1) and a wire feed speed are input through a manual input unit (7) and are stored in memory (6). During working (i.e., machining), a CPU...     

A taper cutting method for inserting a cut surface having a frustoconical shape between first and second taper-cut surfaces is adapted to cut a corner contour in which first and second circular arcs are smoothly connected to respective wire paths on upper and lower workpiece surfaces of a first tapered...     

A wire-cut electrical discharge machine for machining a workpiece (W) through wire-cut electrical discharge machining by employment of an electrode wire (60) which runs from one to the other of upper and lower guide assemblies each having a cooling liquid supply passage (62) and a main passage (64) communicating...     

An improved electrical discharge machining electrode permitting increased cutting speed of the metal workpiece being machined and which improves the operation of the electrical discharge machining equipment in other respects. The improvement is atrributable to an adherent carbon surface coating deposited...     

A wire cut electric discharge machine having: a taper-machining table (6a) secured to the lower end of a vertical column (5a) disposed above a word table (T) capable of being moved in respective directions of an X-axis and a Y-axis perpendicularly intersecting each other in a horizontal plane and capable...     

An improved electrical discharge machining electrode permitting improved cutting action to be achieved at the same level of electrical power being applied to the wire electrode. Such improvement is attributable to a particular configuration and the material being employed in the wire electrode which...     

An automatic TW (traveling-wire) electroerosion machining system for machining a plurality of workpieces of different types required to acquire different contours includes a TW machine having a wire setting unit and located adjacent a predetermined path. A work dispensing unit successively dispenses...     

An electroerosion process and apparatus are used to produce crude electrodes which are shaped thereafter into finished form by wire cutting erosion. The finished electrodes are used in subsequent countersinking of workpieces by electroerosion.

A wire electrical discharge machining apparatus which cuts to a desired shape a workpiece placed on a workpiece table, using a discharge phenomenon occurring between the workpiece and a wire electrode opposite to the workpiece with a machining fluid in a space therebetween, characterized in that the...     

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-frequency voltage source that supplies voltage...     

A wire-cut electrical discharge machining apparatus having upper and lower tables which are disposed on a bed and movable in such directions as to intersect orthogonally with each other, and a wire electrode which is movably stretched so that a workpiece placed on the upper table can be machined by an...     

A wire cut electric discharge machine for electric discharge machining a work (W) held on a work table (24). A wire electrode (14) supplied by a wire supplying device (12) is passed between upper and lower heads (22, 26) under tension through an electric discharge machining region where the work (W)...     

A block of electrically-conductive material which is to be formed into a body with internal and/or external surfaces that approximate hyperboloids of one sheet is placed so that its axis is set at a predetermined skew angle with relation to a travelling EDM electrode wire and the electrode wire is then...     

A wire cut electrodischarge machine tool, wherein when the electrode wire breaks during electrodischarge machining, the wire disconnected end is cut and repaired at a repair position far from the electrodischarge machining region by a cutter means, following movement of the wire end is prevented when...     

A thermionic cathode structure comprises two parallel thermionic electron emitter elements which are made of a heat resistant and electric conductive inorganic compound. Each of them has one end electrically closed and the other end functioning as a current feeding port.

A travelling wire electro-erosion machine in which an electrical discharge is generated in a narrow gap between a wire electrode and a work piece through a processing liquid so as to erossively remove material from the work piece. A wire guide device is provided for supporting and guiding the wire electrode...     

In an electric discharge machine in which electric discharge is cause to take place between a workpiece (6) and an electrode (1) such as a wire electrode or die sinking electrode which are confronted through a machining solution (7) with each other with a small gap therebetween while the electrode (1)...     

A wire cut discharge machine comprises a wire electrode, wire electrode feeding rollers, a tension applying unit for applying a tension to the wire electrode, a current applying unit for applying a high frequency current to the wire electrode, and a wire electrode retaining roller. Each of the tension...     

A mechanism for preventing the loosening of a wire electrode of an EDM apparatus which is wound around a bobbin. The mechanism is provided with a loosening preventive device 5 including a presser plate 8 for pressing the outer periphery of the wire electrode against the bobbin by a spring pressure. The...     

A wire-cutting electric discharge machining device comprises a process precision detection device. The process precision detection device detects process error by measuring spacings between the wire electrode, which will be moved along a predetermined measurement path, and a processed edge of the workpiece,...     

A wire electrodischarge machine comprises a cross table on which a workpiece is mounted and which is driven in a horizontal plane. In X and Y directions, upper and lower dielectric fluid nozzles which are disposed above and below the workpiece, a nozzle drive device for driving one of the upper and lower...     

A broach which has several cutting elements and a support unit to which the cutting elements are attached is made by cutting the cutting elements through electric-discharge machining, in particular wire-EDM so that the production thereof is less time consuming and less expensive. Moreover, the cutting...     

A wire electrode for a traveling wire EDM apparatus that comprises a copper clad steel core that is clad with a homogenous, outer brass layer using a classical bonding process. The copper clad steel core has a conductivity in the range of 50%-70% IACS (International Annealed Copper Standard) and the...     

A wire electric discharge machining apparatus comprises a tank having an opening at its one side surface, which is movable in a two-dimensional plane, a shielding body having a through hole, which is in slide-contact with the side surface having the opening of the tank so as to close the opening, an...     

The speed at which a wire electrode moves is detected, and the speed at which a wire supply bobbin supplying the wire electrode rotates is also detected. Parameters representing the shape of the wire supply bobbin and the type of the wire electrode and indicating the relationship between the diameter...     

An automatic wire threading method for a wire-cut electric discharge machine is provided, which is capable of permitting a wire electrode to pass through a fine-diameter machining start hole using of a simple arrangement. After an upper wire supporting portion on the wire supply side of a wire transportation...     

A wire cut electric discharge machine which is capable of taper-machining with high accuracy. A correction factor which is to correct errors attributing to a special purpose jig is obtained according to a difference between an aimed angle and an actual taper angle of a test workpiece which has been machined...     

A wire-extension end detector having high operational reliability is provided for use with a wire-cut electric discharge machine. As a wire comes between a wire drive roller and a pinch roller during a wire extension, it is conveyed by rotation of the rollers. As the wire travels, a disc (4c) integral...     

A wire disconnection position detecting apparatus of a wire feed path in which wire disconnection is caused and the causes of the disconnection in this section set in advance. Upon disconnection of a wire, as a voltage for disconnection position detection applied to the wire through a conductor is detected...     

A wire cut electrical discharge machine includes a control device which corrects a change in the electrode side gap due to a change in the amount of removal in accordance with information relating to the machining operation provided beforehand and information indicating a current machining position and...     

In an automatic programming apparatus involving NC program data for wire-cut electric discharge machining according to the invention, data specifying an approach path and a departure path, as well as wire-cut machining conditions, are registered in advance. In automatic programming, rather than entering...     

A feed apparatus includes first guides disposed between a base and a first slide to guide the first slide on the base along a first axis, second guides disposed between the first slide and a second slide to guide the second slide on the first slide along a second axis at a right angle to the first axis,...     

A wire cutting electric discharge machine which carries out an electric discharge process on a workpiece using a wire electrode of normal diameter, for example, 0.1 mm or greater, can also be used with a fine wire electrode with a diameter of less than 0.1 mm. The fine wire electrode can only withstand...     

In a wire cut electric discharge machine, a CPU stores a reference specific resistance specified for a machining solution according to a numerical control program, and causes a specific resistance control unit to control the specific resistance of the machining solution, and compares the machining solution's...     

A wire electrical discharge machining apparatus comprising a nozzle for a machining liquid for jetting the machining liquid from a jet hole, a surrounding member for intercepting the flow of the machining liquid jetted from the nozzle so as to prevent the machining liquid from flowing out to a portion...     

An electrical discharge machining wire electrode and a process of forming the wire electrode. The electrode comprises a primary constituent selected from the group consisting essentially of brass copper and alloys thereof and a secondary constituent essentially of about 3 to about 40 percent by weight...     

A wire cut electric discharge machine which uses an NC program which can be executed without concerning how much the cutting locus is left unmachined, to perform a cut leaving operation and a cut completing operation. The wire cut electric discharge machine is capable of machining a plurality of parts...     

A wire cut-type electric discharging method of machining a work for machining a portion having a predetermined taper wherein the portion to be machined comprises a first straight section, a second straight section extending in parallel to the first straight section and an arc-shaped section located between...     

A block of electrically-conductive material which is to be formed into a body with internal and/or external surfaces that approximate hyperboloids of one sheet is placed so that its axis is set at a predetermined skew angle with relation to a travelling EDM electrode wire and the electrode wire is then...     

A wire electrode feeding apparatus for an electrodischarge machine uses a motor-driven capstan roller to feed the wire electrode from a bobbin. A pinch roller presses the wire electrode against the capstan roller with a pressure that can be adjusted by a pressure adjusting mechanism. A pre-tension motor...     

An automatic wire extension method capable of effecting reliable and smooth wire extension regardless of the size of the diameter of an initial hole and even with use of an inexpensive apparatus, such that during the wire extension through an initial hole having a normal diameter, when a wire electrode...     

An electric discharge wire cutting machine with one nozzle above the workpiece and another nozzle beneath the workpiece, one of the nozzles having a shape obtained by rotating an arc of a circle about the central axis of the conical configuration of the nozzle. This shape allows the working fluid to...     

Wire erosion machine in portal construction comprising a machine bed with two lateral columns and a portal bridge, a workpiece clamping table frame, an upper cantilever arm above the latter comprising a wire deflecting guide, a lower cantilever arm below the latter comprising a wire deflecting guide,...     

A wire-cut electric discharge machining method which is capable of preventing damage which may be caused when electric discharge machining is interrupted due to a shortage of wire supply in the middle of a certain machining section, so as to improve the quality of products. A central processing unit...     

A wire electric discharge machining apparatus wherein workpiece and a wire supported by a pair of guides are moved relative to each other in an X-axis direction and a Y-axis direction, one of the guides being moved relative to the other guide in two directions in a horizontal plane for performing a machining...     

A wire feed apparatus for a wire cut electric discharge machining apparatus, capable of moving a wire conveyor belt from an automatic wire extension position to a non-wire-transfer shunt position at the time of electric discharge machining, thereby preventing wear of the belts and reducing variation...     

A machining fluid circulating apparatus capable of variably controlling the amount of machining fluid supplied to an electric discharge machining region and maintaining the effective amount of the machining fluid supplied to a worktable unchanged. The amount of water which is supplied as machining fluid...     

A wire-electrode arrangement for effecting a spark-erosive cutting and a method for the manufacture of a wire electrode. In order to be able to cut non-conductive materials, a plus potential and also a minus potential can be applied to the electrode, since the wire electrode is formed by a first and...     

A wire cutting electric discharge machine with a wire guide roller having a V-shaped groove beneath the workpiece, and a wire guide between the guide roller and a conveyor belt.

A core removing apparatus for removing cores from a workpiece upwardly or downwardly in dependence on the shape of each core cut out from the workpiece by means of wire-cut electric discharge machinng comprises a core removing unit (6) mounted on an electric discharge machine body. When a first operation...     

In a wire-cut EDM apparatus for cutting a workpiece (2) submerged in a processing tank (3) filled with a machining fluid (15), an opening (24) is made in the side wall of the tank through which an arm unit passes. A slide plate (14) also has an opening for passage of the arm unit and also provents leakage...     

A prompt (MEQ) which indicates whether a machining end-point is (i) a point which coincides with a machining starting point, (ii) a point a predetermined amount .DELTA..alpha. past the machining starting point, or (iii) a point a predetermined amount .DELTA..alpha. short of the machining starting point...     

An electrical discharge machine in which the operating state of a machining fluid cooler can be easily ascertained and adjusted. The machining fluid cooler comprises a body disposed on the rear side of a housing of the electrical discharge machine and a panel (21) disposed on the front of a control device...     

A wire cut electric discharge machine provided with a machining fluid supply apparatus capable of supplying machining fluid in an amount large enough to permit a stable wire extension even in a finishing operation. During rough machining, a first flow regulating valve (6) provided in a first pipe (3)...     

Ratios between a distance between an upper wire guide and the upper surface of a workpiece to be machined, a thickness of the workpiece and a distance between a lower wire guide and the lower surface of the workpiece are given to the inlet and outlet positions of a wire electrode at the upper and lower...     

A wire electrode for electro-discharge machining made of a Cu alloy containing 38 to 50 percent by weight of Zn. The Cu alloy may also contain 0.01 to 1.0 percent by weight of Zr, 0.001 to 0.05 percent by weight in total of at least one element selected from a group of Ce, Ti, Mg, Bi and Mn, and/or 0.01...     

Accurate control of the tension of a wire electrode in a wirecut electrical discharge machine is achieved by eliminating a direct-current (DC) component from a speed difference signal between a braking section and a recovery section of the machine. The DC component of the speed signal which is eliminated...     

A wire electrode for cutting of workpieces by means of spark erosion, which consists of an eroding wire with or without a jacket, with at least the jacket containing one or several metallic alloy parts having a low volatilization temperature, such as zinc, cadmium, lead, antimony, bismuth, graphite or...     

The wire-cut electric discharge machine controls the mean voltage or mean current detected in the detection circuit in response to the variation of the feed rate of the workpiece. The electrostatic attractive force and discharge repulsive force act to the workpiece and make a balance. As a result, the...     

An EDM machine comprises a machining tank which moves along X-axis. An upper guide and a lower guide are formed integrally with a Y-axis moving block. The Y-axis moving block moves along a pair of rails that are placed on a horizontal plane. The horizontal plane is formed on a column within which portions...     

A wire cut electric discharge machine (1) having an improved wire guide means (17) located at a bent portion of a wire path. The wire guide means (17) comprises a wire guide roller (6) and a wire deviation preventive member (16) whose one end is fixed to the side of body (3). A part of a retaining member...     

A wire feed device for a wire cut electric spark machine in which a wire is delivered from a wire bobbin in the direction orthogonal to the axis of the wire bobbin to prevent a "jump" of the wire as well as a fluctuation in wire tension arising from the jump, and which can reduce a space required for...     

An apparatus for preventing damage and malfunction to workpiece and electrode travelling system by quickly and reliably detecting wire electrode breakage during the wire cut discharge machining and, in the event of breakage, stopping machining or the like. Unlike conventional mechanical detecting means...     

A piston-slide valve including a housing in which a piston with at least one oil groove and control edge is guided shiftable or slidable in a bore characterized thereby that the oil groove of the piston is manufactured via wire erosion. Also the control edges of the piston are manufactured by wire erosion....     

Consolidating expended electrode wire by cutting it into predetermined lengths facilitating handling and yielding a salable byproduct rather than mere salvageable scrap. The apparatus is adapted for use in a wirecut EDM machine having an advancing electrode wire, a wire driver assembly for advancing...     

When performing contour machining of a workpiece by the wire cut electro-discharge method, a first holding elements, formed of an electromagnet, etc., for maintaining a corepiece, is fixed to a second holding elements which is fixed to an upper wire guide block, so that the first holding elements can...     

An immersion type wire cut electric discharge machine is provided with a sealing structure for sealing a gap between a machining liquid tank and a lower arm while permitting movement of the tank relative to the arm, and nozzles for preventing sludge from adhering to the inner surface of a slide member...     

An improved apparatus for placing current on a moving wire electrode traveling between two points and over a conductive member in the form of a rod. The rod is at an acute angle with respect to the normal straight line of wire travel and its circular outer surface is in contact with the moving wire....