Abstract: A workpiece (1) is clamped onto a compound rest table (5) and machined by a tool electrode (2) running tensioned between two electrode guides (10, 11). A container (18) holds the working liquid into which a working zone (9) of the workpiece (1) is immersed. The lower electrode guide (1) is supported on the stand (4) of the machine by means of a guidearm (13). The guide-arm (13) crosses the back wall (19) of a container (18) at a right angle in an opening (21a) covered by a sliding closing piece (22) that is parallel to the back wall (19) of the container (18). The guide-arm (13) crosses the closing piece (22) of the container (18) at a right angle in another opening (24) where it is slidable. The closing piece (22) is arranged at the outside of the container (18) on a side (26) of the back wall ( 19) facing the stand (4).

Abstract: A rotating sprial charger for compressible media is disclosed having a housing in which two symmetrically constructed displacer disks are located and rotated by drive elements. The two displacer disks are provided on one side with helical ribs. To form a conveying space, the ribs engage each other and seal with their free frontal sides against the opposing displacer disk. To increase the strength of the ribs, a reinforcement is provided on the outer periphery of the ribs. The reinforcement is located on the outer wall of the rib and extends over the entire axial length of the ribs. The reinforcement also extends in the peripheral direction from the end of each rib on the inlet side to the end on the inlet side of the rib following in the peripheral direction.

Abstract: A rotating helical charger for compressible media consists essentially of a housing (1), in which two symmetrically constructed displacement disk (6, 7) are rotated by drive elements (18-23). The two displacement disks are equipped on one side with helical ribs (14). To form a conveying space (15), the ribs engage each other and seal with their free frontal sides (24) against the opposing displacement disk. To maintain the sealing effect, a pressure chamber (26) is provided, which communicates with the outlet (16) of the charger and may be acted upon by an axially displaceable annular disk (28), actively connected with an axially movable displacement disk (6). The pressure chamber (26) may be connected by means of a valve (32) with the atmosphere.

Abstract: In order to avoid unnecessarily long withdrawal movements and to eliminate as rapidly as possible short-circuits upon contact of a countersinking electrode with the workpiece being worked in the electroerosion machine, whilst also adapting as flexibly as possible the path of the withdrawal movement to the geometry of the workpiece to be eroded and the path eroded therein, the withdrawal movement of the countersinking electrode during a short-circuit is controlled so that in the presence of a short-circuit the countersinking electrode is initially moved back by a predetermined distance along the previously covered or eroded path from a short-circuit point to an intermediate point and then the electrode is moved away from the intermediate point over the given withdrawal path if there is still a short-circuit on reaching the intermediate point.

Abstract: A numerical control system performs path interpolation calculations for the control of highly dynamic processes having different path contour geometries wherein a vector having a length L connects in linear form a first point P1 to a second point P2. These points are located in three dimensional Cartesian space having axes x, y, and z. Length L has Cartesian components X, Y and Z and is subject to an angular rotation C about the z axis. The system also has process parameters S and K wherein S is an address identifying the parameter to be modified and K identifies the modified parameter value. A coarse interpolator outputs the path elements L, X, Y, Z and C and the parameters S and K between path increments as course interpolations which are a function of the path contour geometry but are independent of time frame. A fine interpolator having an intermediate memory is connected downstream from the course interpolator. The fine interpolator outputs the path elements and parameters as fine interpolations.

Abstract: A servocontrol device for controlling a distance between an erosion electrode and a workpiece in an erosion machine calculates an error signal from an actual distance between the erosion electrode and the workpiece and a desired distance. The error signal undergoes low pass filtering, before it is used as a control signal for a drive connected to the erosion electrode to drive the latter. For optimizing the dynamic characteristics, the servocontrol device has a variable cutoff frequency, which is dependent on at least one parameter of a processing pulse supplied to the erosion electrode.

Abstract: An apparatus for filtering a machining liquid of an electroerosion machine includes a pump for supplying the machining liquid to a filter having a membrane. The filter is constructed in such a way that the concentrate is carried substantially tangentially to the membrane wall in a circuit, and the concentrate quantity per time unit carried substantially tangentially to the filter membrane wall in the circuit is greater than the permeate quantity per time unit removed from the filter.

Abstract: A coarse interpolator is adapted for use in a numerical control system for performing path interpolation calculations for the control of highly dynamic processes. These processess have different path contour geometries wherein a vector having a length L connects in linear form a first point P1 to a second point P2. These points are located in three dimensional Cartesian space having axes X, Y, and Z, Length L has Cartesian components X, Y and Z and is subject to an angular rotation C about the z axis. The interpolator responds to a group of predetermined vector lengths, starting with the maximum length, in order to calculate the path elements L, X, Y, Z and C for the maximum length vector. A path error E is then determined for the path elements so calculated. The error E is then compared with a praedetemined maximum error value. If the error E does not exceed the maximum value, the calculated path elements are outputted.

Abstract: 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.

Abstract: In the electroerosive working or machining of electrically slight or non-conducting workpieces, the workpieces are made electrically conductive, at least in parts of an electroerosion working zone, by means of the supply to the workpieces of electromagnetic energy. As a result, the valency band of the atoms of the workpiece is raised, which produces therein the electrical conductivity.

Abstract: Method and apparatus for purging the eroding zone during electroerosive countersinking, in which one or more short-stroke second raising lowering movements of a tool electrode relative to a workpiece are performed in the dielectric between two first long stroke raising/lowering movements and the frequency and/or height of stroke of the raising/lowering movements is automatically adapted to the conditions in the working gap.

Abstract: An element of a machine is provided with a magnetically or optically readable data medium. The data medium is divided into grooves and sectors. A corresponding scanning head for scanning the data medium is arranged on another element of the machine. The data are coded so that it is possible to identify each sector and each groove on the data medium. After reading the contents of the data medium of the element of the machine by the scanning head of the other element, a value of the measurement of the relative positions of the two elements is affected to the data read by the head. This value may be used to control the position of the elements or to displace one of the elements relative to the other. The data medium may be linear or may be configured as a disc. The scanning head may be secured to the associated element. It may also be attached by means of a mechanism so as to have a relative motion with respect to the data medium even when the elements are stationary with respect to each other.

Abstract: A wire guidance arrangement for guiding a wire electrode of a spark erosion machine has several replaceable wire guides, which are mutually spaced to thereby form individual erosion zones. The individual wire guides are held by spring tension in corresponding openings of a guide plate, which rest on a base block. The common plane of the guide plate and the base block forms a reference plane on which are axially centered the undersides of wire guidance members of the individual wire guides. Even in the case of a greater wire electrode fixing length, this always ensures a satisfactory guidance of the wire electrode. In addition, the individual wire guides can be simply replaced without any adjustment being necessary.

Abstract: The completion of a starting hole produced by spark erosion in a workpiece by use of a starter electrode in an electroerosion machine is automatically detected by a sudden change in a sensed process parameter when the starter electrode has passed through the workpiece.

Abstract: A pulse generator for spark-erosive metal working contains a charge regulator circuit for charging a storage capacitor. A storage capacitor is sinusoidally discharged across a switching device to a spark gap. Charging always occurs in a defined manner independently of the preceding pulses, so that uniform pulses can be generated. The storage capacitor is charged with an energy excess of required for discharge and the energy still remaining after spark discharge is recovered in a d.c. voltage source. The switching device (3) is non-conductive only when the discharge current has substantially decayed.

Abstract: A power supply component for cutting a wire electrode of an electroerosion machine having a core of hard metal and about it a layer of an electrically conductive material, which is softer than the core. Within a relatively short time, when the machine is in use, the wire cuts a notch in the soft layer, the notch acting as a wire guide. As soon as the notch reaches the harder material of the core, the hard metal prevents any further notch deepening.

Abstract: 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.

Abstract: An automatic lubricant metering device consists essentially of a housing (4), from inside of which a piston (5) is conveying a lubricant (15) through a feeder line (12) to the lubricating location (2) of a revolving shaft (1). The automatic feature consists of that the spring-loaded piston (5) is connected with a pin (6) made of an abradable material. The advance of the piston (5) is a function of the abrasion of the pin (6) on the appropriately roughened surface of the shaft. The lubricant is contained in a compressible bellows (11) equipped with a feeder line (12) to the lubricating location (2). The feed to the lubricating location is conducted in the area of the shaft through a pipe (13) located preferably without contact in a center bore (14) of the shaft. The outlet of this pipe opens into a radial bore (16) connected with the lubricating location (16).

Abstract: For the securing and removal of waste fragments from eroded openings of a workpiece on a spark erosion machine, a collecting plate is provided below the workpiece to retain the waste fragments. In the case of an X/Y-movement of the workpieces, the waste fragments move over the top of the collecting plate. A collecting container is arranged on the edge of the collecting plate and the waste fragments drop into it in the case of a corresponding X/Y-movement of the workpiece. According to another variant, a lifting cylinder can be positioned above the workpiece and with a gripper (e.g. a magnet) grips the waste fragments and draws them upwards out of the eroded opening. By moving the lifting cylinder, the waste fragment is then placed on a conveyor belt or can be directly conveyed into the collecting container.

Abstract: Wire cutting apparatus which includes a mechanism for conveying an electrode and cutting device having rotary cutting elements and a tender tool. A post generator is electrically connected to the cutting elements and the counter tool for purposes of supplying power to the spark erosion machine. The cutting elements are electrically insulated with respect to the drive shaft thereof and the service of the counter tool is electrically insulated relative to the mounting support thereof. Additionally, there is provided an electrical connection which constantly forces the rotary cutting elements and the counter tool to the electrical potential of the electrode.