Electric Spark Machining Patents (Class 219/69.11)
  • Patent number: 6768076
    Abstract: A base and fixture adapter set-up comprising a bas. The base comprising a main locating surface, an alignment surface, and a second solid surface or stop edge. A compound angle hole in the base for accommodating a clamping bolt and an adapter comprising a corresponding claiming bolt hole. As the clamping bolt is tightened the adapter contacts the main locating surface, then the alignment surface, and finally the stop edge. The adapter for connecting to a plurality of fixtures.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: July 27, 2004
    Inventor: Joseph M. Walter
  • Patent number: 6759622
    Abstract: The invention relates to an interconnection between two overlapping end sections of metallic strips (10, 20) in which a quick and economical interconnetion should be produced. To this end, the invention provides that several annular welds (30) are provided in the overlapping area (15) which are situated at a distance from the face ends of both strips (10, 20).
    Type: Grant
    Filed: June 7, 2002
    Date of Patent: July 6, 2004
    Assignee: Prymetall GmbH & Co. KG
    Inventor: Peter Zinsen
  • Patent number: 6755408
    Abstract: A vise with the precision to match the quality expected from a wire electrical discharge machine. A quality vise is provided to locate parts with extreme repeatability from part to part enabling production of parts with exact duplication. With the range of the vise opening a variety of sizes of parts may be held, and with the low compact profile of the vise there is a decrease likelihood of run into interference with the wire electric discharge machine while in the cutting operation. Due to the exposure of water in the cutting operation on the wire electrical discharge machine the vise is made from stainless steel. The vise comprising a body comprising sidewalls and a main alignment surface, the main alignment surface having a length and for contacting a workpiece along its length, with a solid stationary jaw extending from the main alignment surface for contacting the workpiece during clamping of the vise.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: June 29, 2004
    Inventor: Joseph M. Walter
  • Patent number: 6754955
    Abstract: Using sinker electrode discharge machining tools, damaged portions of partitions of the turbine which have been removed and replaced with weld material of increased thickness may be shaped and contoured to blend with the suction and pressure sides of the partitions. The diaphragm containing the partitions is located in a tank containing dielectric material. A numerically controlled EDM machine directs first and second sinker EDM tools having surfaces corresponding to designed surfaces of the trailing edge portions of the partitions applied to contour and shape the opposite surfaces of the weld material to blend with the pressure and suction sides of the partitions. A third EDM tool is used to shape the juncture at opposite ends of each partition with the arcuate surfaces of the inner and outer bands.
    Type: Grant
    Filed: January 30, 2003
    Date of Patent: June 29, 2004
    Assignee: General Electric Company
    Inventors: Ralph J. Carl, Jr., John Francis Nolan, Bin Wei, Todd Joseph Fischer
  • Publication number: 20040120781
    Abstract: A customized prosthesis, or instrument, for medical/dental applications is provided which replicates the desired bone-graft, tooth, or tool, being replaced. The dimensions of the prosthesis, or instrument, are determined by mathematically interpolating key-points that characterize a specific part. A computer controlled machine then cuts the desired part out of a pre-fabricated blank, directly at the site of operation. Methods of the invention relate to selecting the type of part being replaced, identifying and measuring the coordinates of key-points for that part, and initializing the automated machining process. Also, special supporting devices that include pre-fabricated features common between certain parts, are used in order to facilitate the machining process. The identification of key-points is done by comparing a schematic drawing of the type of part being replaced to the actual part. A grid is then used to measure the coordinates for those key-points.
    Type: Application
    Filed: June 3, 2003
    Publication date: June 24, 2004
    Inventors: Silvio Castello Branco de Luca, Eduardo Cezar de Andrade de Mello e Souza, Alexandre de Lima Spinola, Eduardo da Rocha Albuquerque, Mauricio Ladeira Casado
  • Patent number: 6754557
    Abstract: The present invention generally relates to a system and method for manufacturing plastic injection mold cavity components. More specifically, the present invention provides an integrated system and method for manufacturing plastic injection mold cavity components, which integrates manufacturing between two or more subcells. In one embodiment of the invention, a supercell system integrates two or more subcells, in which component workpieces and electrodes are machined. A supercell may include a computerized master control unit, configured to monitor and provide instructions for a master robot that delivers and retrieves workpieces and electrodes to two or more subcells. Thus, two or more subcells may be integrated by the master control unit, the master robot, a track or path that the master robot follows, identification indicia attached to workpieces and electrodes, a combination thereof or any other components of supercell that may suitably integrate two or more subcells.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: June 22, 2004
    Assignee: The Tech Group
    Inventor: Len Graham
  • Patent number: 6740839
    Abstract: A transporting and positioning device for tool magazine of a bridge type machine tool comprises a pair of parallel guide-ways on a plate, a seat slidably mounted on the guide-ways for supporting the tool magazine, a drive mechanism including a cylinder, an extendable positioning shaft, a connection block adjacent the plate the connection block including a top hole and being fixed to the table, and a second cylinder having an extendable second positioning shaft; In an operating state of the machine tool, the second positioning shaft is actuated by the second cylinder to project an adjustable distance through the plate to urge against the seat for fastening the seat and the tool magazine. A tool change is performed after fastening the positioning shaft in the hole. The invention is also applicable to EDM.
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: May 25, 2004
    Assignee: Industrial Technology Research Institute
    Inventors: Hsuan-Jen Kung, En-Sheng Chang, Chin-Mou Hsu
  • Patent number: 6731026
    Abstract: In an electric discharge machining apparatus using linear motor drive in which a machining power supply unit supplies an inter-electrode space between an electrode (1) and a workpiece (2) with a machining power and the workpiece (2) is machined while the electrode (1) and the workpiece (2) are moved in relation to each other by means of a driving device (8, 9, 10) implemented by a linear motor, a magnet supporting plate (17) for supporting a magnet (16) which is on the secondary side of the linear motor; a base plate (18) formed with at least one hole portion (18a); a spacer (19) for holding the magnet supporting plate (17) and the base plate (18) while leaving a predetermined space therebetween; and a compressor, (23), a dryer (24), a lubricator (25) and a regulator (26) for injecting compressed gas (20) from the hole portion (18a) toward the magnet supporting plate (17) are provided.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: May 4, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tsuneo Kawaguchi, Takashi Kanaya, Toshihiro Enya
  • Patent number: 6721621
    Abstract: In wire electrical discharge machining, to make it possible to determine the state of rough machining or finishing in various stages, the machining speed, the working voltage, and execution portion information are stored as a set for each movement of a fixed distance in the process of execution of a plurality of times of machining in which rough machining through finish machining are consecutively executed, and are displayed in a two-dimensional graph.
    Type: Grant
    Filed: October 18, 2002
    Date of Patent: April 13, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shigeaki Naka, Toru Inoue
  • Patent number: 6707304
    Abstract: Devices and methods are disclosed for the contactless detection of a bar-shaped or wire-shaped processing electrode of a machine tool such as a spark erosion machine. The detection is based on measuring an impedance change in the measuring area, which is caused by the processing electrode moving through the measuring area. The impedance change is measured by one or more measuring electrodes disposed in the measuring area.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: March 16, 2004
    Assignee: Agie SA
    Inventors: Ernst Bühler, Juri Cugini, Karl Tobler, Walter Dal Bò
  • Publication number: 20040031774
    Abstract: A CAD/CAM device for an electric discharge machine comprises a check means (32) for checking whether or not a level (HC) of a clamp is lower than a safe level (HLS) Of the machining solution surface when the safe level (HLS) Of the surface of the machining solution, which is obtained when a predetermined safe distance is added to an upper level of the workpiece (W) on the basis of drawing data (19) of the workpiece, is found and when the safe level (HLS) of the surface of the machining solution is compared with a level (HC) of a clamp which is found when a length of the electrode (E) is added to a level of a machining finishing position of the workpiece with respect to the predetermined reference position on the basis of drawing data (18) of the electrode before conducting actual machining. The machining tank (7) can be automatically driven so that machining solution surface level HL is set at safe level (HLS) while safe level (HLS) necessary for actual machining is being recognized.
    Type: Application
    Filed: April 28, 2003
    Publication date: February 19, 2004
    Inventors: Kazuhisa Sugiyama, Naoaki Kagiya
  • Patent number: 6683269
    Abstract: For maintenance and management of filters in a wire electric discharge machine, a sensor for detecting the filtration pressure is disposed between the filter and pump in the working fluid circulation channel. The sensor periodically senses the pressure and its output (transition of water pressure) is stored and sequentially displayed as a graph on a display device to allow monitoring of filter clogging by checking such sensor output at the time of commencing the processing.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: January 27, 2004
    Assignee: Fanuc Ltd.
    Inventors: Yuki Kita, Hiroyuki Abe, Shinji Okuda
  • Patent number: 6674040
    Abstract: A machine tool with a machine frame is disclosed. A first tool guide is provided on the frame to guide a tool to a first guide position. The first tool guide is a movable gantry carrier with a movable first sliding carriage. The tool guide can be moved with respect to the machine frame in a first plane along a first direction and in a second direction which is orthogonal with respect to the first direction. Furthermore, a second tool guide is provided on the machine frame to guide the tool to a second guide position. The second tool guide can be moved with respect to the machine frame in a second plane along a third direction and a fourth direction which is orthogonal to the third direction, independently of the first tool guide. Finally, a tool holder is provided on the machine frame to hold the machined part. The machined part is led between the first and the second guide positions of the tool. The second tool guide is a movable gantry carrier with a movable second sliding carriage.
    Type: Grant
    Filed: December 13, 2001
    Date of Patent: January 6, 2004
    Assignee: AGIE SA
    Inventor: Peter Wehrli
  • Publication number: 20030213776
    Abstract: A tooling set-up to accurately interchange a wide variety of fixtures to be used in a high precision manufacturing process. With the use of an adapter with standard mounting holes custom or standard fixtures could be linked to the machine tool with extreme accuracy in alignment. With the three surface contact achieved by a single clamping pressure, extreme repeatability is built into the design. This system would enable a manufacturing facility to create a more continuous work flow through their Electrical Discharge Machine Department.
    Type: Application
    Filed: May 15, 2002
    Publication date: November 20, 2003
    Inventor: Joseph M. Walter
  • Publication number: 20030213777
    Abstract: A vise with the precision to match the quality expected of a Wire Electrical Discharge Machine. With the quality of the vise you can locate parts with extreme repeatability from part to part enabling to produce parts with exact duplication. With the range of the opening you are able to hold a variety of sizes of parts and with the low compact profile you are less likely to run into interference with the machine while in the cutting operation. Due to the exposure of water in the cutting operation on the Wire Electrical Discharge Machine the vise is made from stainless steel and for wear resistance the stainless steel of a heat treatable grade.
    Type: Application
    Filed: May 15, 2002
    Publication date: November 20, 2003
    Inventor: Joseph M. Walter
  • Patent number: 6627833
    Abstract: A fixture for securing a workpiece, which includes: a base; a plurality of locators on the base for accepting the workpiece; a plurality of arms, each secured to the base at a pivot point; and a lever for actuating the arms against the workpiece. The arms positively position the workpiece against the locators. The fixture is part of an electrical discharge machining (EDM) apparatus, which also includes a tank and a holder for supporting an electrode in said tank. The lever actuates towards a front of the tank.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: September 30, 2003
    Assignee: United Technologies Corporation
    Inventors: Richard W. Varsell, Donald Joseph Voisine
  • Patent number: 6621033
    Abstract: A layered anisotropically conductive element, a resistant element, and a feed element constitute an electrode for discharge machining. The layered anisotropically conductive element includes high conductivity layers and low conductivity layers alternately laminated on each other, the high conductivity layers and the low conductivity layers being made of thin metallic plates coated with an insulating film. The layered anisotropically conductive element has an anisotropic conductivity, in which the conductivity in a direction parallel to the low conductivity layers is much higher than that in a direction perpendicular to the low conductivity layers. The resistant element is connected to one of end surfaces of the layered anisotropically conductive element perpendicular to the layers. The feed element is connected to the resistant element.
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: September 16, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tatsushi Sato, Yoshihito Imai, Hidetaka Miyake, Takayuki Nakagawa
  • Publication number: 20030141284
    Abstract: A fixture for securing a workpiece, comprising: a base; a plurality of locators on the base for accepting the workpiece; a plurality of arms, each secured to the base at a pivot point; and a lever for actuating the arms against the workpiece. The arms positively position the workpiece against the locators. The fixture is part of an electrical discharge machining (EDM) apparatus, which also includes a tank and a holder for supporting an electrode in said tank. The lever actuates towards a front of the tank.
    Type: Application
    Filed: January 30, 2002
    Publication date: July 31, 2003
    Inventors: Richard W. Varsell, Donald Joseph Voisine
  • Publication number: 20030102287
    Abstract: A tool attachable to a machine tool in the same way as an ordinary tool, capable of being driven and operating without connecting with an external power supply etc., and made small enough to enable automatic changing, provided with a generator for generating power by energy of compressed air supplied from the outside, a motor driven by power generated by the generator, and a cutting tool driven by the motor for cutting the workpiece.
    Type: Application
    Filed: November 27, 2002
    Publication date: June 5, 2003
    Inventors: Koji Katsumata, Sakashi Adachi
  • Publication number: 20030080094
    Abstract: An electric discharge machining apparatus is provided with an electrode mounting section which mounts a tool electrode, and an electrode driving section which has a radial driving section which supports and drives the electrode mounting section in a non-contact manner in a radial direction and a thrust driving section which supports and drives the electrode mounting section in a non-contact manner in a thrust direction, and a machining state is controlled by adjusting a position of the tool electrode by the electrode driving section. Because of such a structure, a mass increase of a section which should be driven together with the electrode is restricted, and high response in X-axis, Y-axis and Z-axis directions are achieved, whereby an electric discharge machining apparatus capable of improving a machining speed and a machining accuracy is achieved.
    Type: Application
    Filed: May 20, 2002
    Publication date: May 1, 2003
    Inventors: Yoshihito Imai, Kabushiki Kaisha, Hidetaka Miyake, Takayuki Nakagawa
  • Publication number: 20030073554
    Abstract: A tool attachable to a spindle of a machine tool by an automatic tool changer in the same way as an ordinary tool, capable of being driven without connecting with an external power supply etc., and able to rotate at a rotational speed different from than that of the spindle of the machine tool without supply of electric power from the outside, provided with a machining tool for machining a workpiece, a motor connected with the machining tool and rotating the machining tool, and a generator to which rotary force is transmitted from the spindle of the machine tool and generating electric power to drive the motor, the shaft of the motor being arranged in an orientation different from the axial center of the spindle.
    Type: Application
    Filed: October 15, 2002
    Publication date: April 17, 2003
    Inventors: Sakashi Adachi, Koji Katsumata
  • Publication number: 20030066820
    Abstract: An apparatus for machining a turbine blade assembly includes at least one locator for positioning the blade assembly with respect to the apparatus. The apparatus also includes at least one biasing mechanism for maintaining a relative position of the blade assembly with respect to said apparatus and at least one clamping device that includes a predetermined locking position. The clamping device retains the blade assembly.
    Type: Application
    Filed: October 10, 2001
    Publication date: April 10, 2003
    Inventors: Brett Wayne Byrnes, James Henry Madge, Betsy Weddendorf
  • Patent number: 6538226
    Abstract: The machining liquid includes a load of particles contained in a dielectric liquid. The particles are carbon microfibers, sectioned or not, having a diameter (e) comprised between 0.2 and 8 micrometers and a length which is a function of the machining gap (G) provided between the electrode-tool and the electrode-workpiece. Thanks to this load of carbon microfibers of well-defined dimensions and geometry, the electro-erosion output, the precision of machining, the condition of the surface obtained and the ability to replicate machining performances, are considerably improved.
    Type: Grant
    Filed: February 1, 2001
    Date of Patent: March 25, 2003
    Assignee: Charmilles Technologies S.A.
    Inventors: Jean-Paul Briffod, René Demellayer, Patrick Rossé
  • Publication number: 20020179573
    Abstract: A micro-electro-discharge machining apparatus includes a substrate, a plurality of electrically conductive electrodes on the substrate arranged in an array, and a plurality of electrical interconnect lines formed on the substrate extending to one or more of the electrodes. An electrical power source is connected from one of its terminals through a resistor to each of the interconnect lines and from its other terminal to a workpiece to be machined. The electrodes connected to different interconnect lines may charge and discharge independently of each other, speeding up the machining process. An interconnect line may extend individually to each electrode so that all of the electrodes can charge and discharge independently of the others.
    Type: Application
    Filed: June 1, 2001
    Publication date: December 5, 2002
    Inventors: Yogesh B. Gianchandani, Kenichi Takahata
  • Publication number: 20020179694
    Abstract: The methods comprises the bonding of defined metals between them by assistance of mechanical pressure and direct electric current so that the local temperature allow the bonding of different metals or alloys without any of them to lose their specific characteristics and to react like one piece of metal with extremely resistance to the electrochemical oxidation. Due to the generating of high oxidants as H2, Cl2, ClO3, O3, O2, H2O2, [OH], [CLOH], [O], through electrolysis, this anode is effective enough to eliminate liquid wastes.
    Type: Application
    Filed: May 31, 2002
    Publication date: December 5, 2002
    Inventor: Markos Ninolakis
  • Patent number: 6486429
    Abstract: An EDM machine for machining a workpiece is disclosed. The EDM machine includes a machine frame having a central stationary machine body and a machining electrode to machine the workpiece. Machining occurs by producing a relative movement in at least one of an X axial direction and a Y axial direction between the machining electrode and the workpiece. The machine also includes a first axial slide for moving at least one of the workpiece and the machining electrode in the X axial direction, and a second axial slide for moving at least one of the machining electrode and the workpiece in the Y axial direction. The first axial slide is mounted in a substantially vertical plane on the machine body for lateral movement in a substantially horizontal direction.
    Type: Grant
    Filed: July 12, 2000
    Date of Patent: November 26, 2002
    Assignees: Agie SA, Charmilles Technologies SA
    Inventors: Peter Wehrli, René Brun
  • Publication number: 20020170885
    Abstract: An electrical discharge machining (EDM) apparatus includes a plurality of work stations, where each work station has at least one electrode. The EDM apparatus further includes one or more power supplies and a power transfer switch for alternately supplying power to various sets of the electrodes. The power transfer switch has a first state wherein each power supply is connected to a corresponding first electrode in one of the work stations and a second state wherein each power supply is connected to a corresponding second electrode in another work station.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 21, 2002
    Inventor: Rudi Oskar Krenz
  • Patent number: 6448527
    Abstract: The invention concerns a high-strength erosion electrode having good electrical conductivity. The erosion electrode is made up of a steel core, an intermediate layer of copper or a copper-containing alloy, and an outer layer containing at least 40 % zinc. The steel core has a patented structure which contains between 0.6 and 1 wt. % carbon and occupies an area corresponding to between 50 and 75 % of the erosion electrode diameter, the intermediate layer occupying an area of between 5 and 40 % of the total diameter, the outer layer occupying an area of between 10 and 30 %, and the zinc content of the outer layer being between 40 and 60 wt. %.
    Type: Grant
    Filed: December 9, 1998
    Date of Patent: September 10, 2002
    Assignee: Berkenhoff GmbH
    Inventors: Bernd Barthel, Heinrich Groos, Hans Hermanni, Klaus Tauber
  • Patent number: 6441333
    Abstract: A green compact electrode for discharge surface treatment used for discharge surface treatment for generating discharge between a work and a green compact electrode obtained by pressuring and compacting a metal powder or a powder of a compound metal, and using the discharge energy forming a coating of an electrode material or a substance obtained through a reaction of the electrode material with the discharge energy on the work surface; the electrode is obtained by mixing a soft metal powder as a bonding agent with the metal powder or the compound metal powder, and pressuring and compacting the mixed powder.
    Type: Grant
    Filed: August 15, 2000
    Date of Patent: August 27, 2002
    Assignee: Mitsubishi Denki K.K.
    Inventors: Akihiro Goto, Toshio Moro
  • Patent number: 6437278
    Abstract: A green compact electrode for discharge surface treatment comprises a main body of green compact electrode obtained by pressuring and compacting metal powder or powder of a metal compound, or either of the two types of powder with ceramics powder added thereto; and a metallic die used for pressuring and compacting the main body of the green compact electrode, and is used for discharge surface treatment together with the die without taking out the main body of green compact electrode from the die.
    Type: Grant
    Filed: April 12, 2000
    Date of Patent: August 20, 2002
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tooru Inoue, Akihiro Goto
  • Patent number: 6433295
    Abstract: When the surface roughness of a work face of the workpiece (2) fixed onto the surface plate table (8) in the work tank (14) in which the work fluid (17) is stored is more than a predetermined value, the bladder (15) capable of expanding or contracting by the pressure of fluid accommodated in the bladder (15) is contracted, and a space between the work tank (14) and the surface plate table (8) is filled with the work fluid (17), and electric discharge work is conducted. When the surface roughness of a work face of the workpiece (2) is not more than a predetermined value, the bladder (15) is expanded, and a quantity of the work fluid (17) getting into between the work tank (14) and the surface plate table (8) is reduced and electric discharge work is conducted.
    Type: Grant
    Filed: November 17, 2000
    Date of Patent: August 13, 2002
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Osamu Yasuda
  • Publication number: 20020079292
    Abstract: A machine tool with a machine frame is disclosed. A first tool guide is provided on the frame to guide a tool to a first guide position. The first tool guide is a movable gantry carrier with a movable first sliding carriage. The tool guide can be moved with respect to the machine frame in a first plane along a first direction and in a second direction which is orthogonal with respect to the first direction. Furthermore, a second tool guide is provided on the machine frame to guide the tool to a second guide position. The second tool guide can be moved with respect to the machine frame in a second plane along a third direction and a fourth direction which is orthogonal to the third direction, independently of the first tool guide. Finally, a tool holder is provided on the machine frame to hold the machined part. The machined part is led between the first and the second guide positions of the tool. The second tool guide is a movable gantry carrier with a movable second sliding carriage.
    Type: Application
    Filed: December 13, 2001
    Publication date: June 27, 2002
    Inventor: Peter Wehrli
  • Patent number: 6407356
    Abstract: An electric discharge machining device comprises a base, a support column, an oil bath, a work platform, a draining pipe, and a linear actuator. The base has an oil storage compartment. The oil bath has a receiving space and a drainage hole through which the support column is put. The draining pipe is fitted over the support column such that one end of the draining pipe is connected with the drainage hole and that other end of the draining pipe is in communication with the oil storage compartment. The oil bath is actuated to slide up and down between an upper position and a lower position. When the oil bath is located at the upper position, the bath is filled with the process oil. When the oil bath is located at the lower position, the process oil is drained out of the oil bath into the oil storage compartment of the base.
    Type: Grant
    Filed: November 21, 2000
    Date of Patent: June 18, 2002
    Inventor: Ton-Shih Lai
  • Patent number: 6403910
    Abstract: An electric discharge machining module for forming a hole in a workpiece with an electrode is provided, comprising a module body, a spindle assembly and a piston assembly. The module body defines a throughbore extending along an axis. The spindle assembly is at least partially positioned within the throughbore for rotation around the axis and includes a first electrode passageway which is coaxial with the axis for receiving the electrode therethrough. The piston assembly is positioned within the throughbore for movement along the axis between a released position and an engaged position. The piston assembly includes a second electrode passageway which is coaxial with the axis for receiving the electrode therethrough. A collet closer of the piston assembly engages a collet of the spindle assembly when the piston assembly is in the engaged position such that the collet grips the electrode for unitary rotational movement of the electrode and the spindle assembly.
    Type: Grant
    Filed: December 14, 1999
    Date of Patent: June 11, 2002
    Assignee: Hi-Tek Manufacturing, Inc.
    Inventors: Scott A. Stang, Levi Turner, Jr.
  • Patent number: 6396022
    Abstract: A method and device for replacing quickly a pipe electrode small-hole electric discharge machining to make a small-hole in a work by electric discharge machining. To make replacement of a pipe electrode 1, an electrode magazine 5 containing an electrode guide 4 in which the pipe electrode 1 is accommodated is replaced by using means. The electrode magazine 5 has a self-position maintenance tip 8 for maintaining the position taken by the electrode 1 until then while the electrode magazine 5 is removed from the electrode discharge machine and resuming the electrode discharge from the position after the electrode magazine 5 is attached again to the electric discharge machine.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: May 28, 2002
    Assignee: Astec Corporation Limted
    Inventor: Eiji Suzuki
  • Patent number: 6392182
    Abstract: A work tank (20) for an electric discharge machine includes a tank wall (21) having an opening in a front surface and surrounding a workpiece; a front door (31) horizontally movable between an unlock position, where the front door is vertically movable, and a lock position, where the opening is closed in a generally liquid-tight relationship; a pair of brackets (32) attached to both sides of the front door and extending rearwardly; a handle lever (51) capable of pivoting about a fulcrum (35) and supported on at least one of the brackets; and a cam follower, fixed to the handle lever further forward than the pivot, the cam follower being vertically movable between a first position (H1) higher than the fulcrum and a second position (H2) lower than the fulcrum. The cam follower is fitted loosely into a groove (62) extending vertically and formed in a rail block (61). Horizontal movement of the cam follower is restricted.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: May 21, 2002
    Assignee: Sodick Co., Ltd.
    Inventor: Akio Hosaka
  • Patent number: 6385500
    Abstract: The present invention relates to an improved servomechanism for regulating the spark gap in micro electrical discharge machining (micro-EDM). The present invention utilizes a hybrid two actuator servo system for positioning the micro-EDM electrode. The hybrid system comprises a fast, easily controllable, short stroke actuator (such as a piezoelectric actuator) for good instantaneous response, and a second, slower actuator for positioning the fast actuator and for providing the required long stroke. This allows the slower actuator to “feed” the electrode into the work-piece utilizing its long stroke, and the fast, short stroke actuator to respond quickly to instantaneous variations in the spark gap, such as short circuits.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: May 7, 2002
    Assignee: Cummins Engine Company, Inc.
    Inventors: Rajadasa R. Hebbar, Ramanujam Ramabhadran, Srinivasan Chandrasekar
  • Patent number: 6373018
    Abstract: An apparatus for electrical discharge machining multiple holes in an electrically conductive work piece, includes an electrical discharge machine for rotatably mounting a first electrode, and at least one electrical discharge unit for rotatably mounting at least one second electrode. The electrical discharge machine includes a driver and a controller, the driver is desirably coupled to the electrical discharge machine and the electrical discharge unit for rotating the first electrode and the at least one second electrode, and the controller is desirably coupled to the electrical discharge machine and the at least one electrical discharge unit for controlling a supply of electrical energy from the first electrode and second electrode to the workpiece.
    Type: Grant
    Filed: February 7, 2000
    Date of Patent: April 16, 2002
    Assignee: General Electric Company
    Inventors: Bin Wei, Martin Kin-Fei Lee
  • Patent number: 6369343
    Abstract: An electrical discharge machining (EDM) apparatus includes a single workpiece fixture for holding a workpiece and a plurality of machining heads for machining different features into the workpiece. For example, a first machining head is arranged to machine a first feature into the workpiece, and a second machining head is arranged to machine a second feature into the workpiece. Each machining head is connected to a separate control system so as to operate independently.
    Type: Grant
    Filed: September 20, 2000
    Date of Patent: April 9, 2002
    Assignee: General Electric Company
    Inventors: Rudi Oskar Krenz, Brett Wayne Byrnes, Willem Thomas DeGraaff
  • Patent number: 6362446
    Abstract: An apparatus for drilling cooling holes through a wall of a hollow component is disclosed. First, a laser drill is used for drilling at least one rough blind hole within a component wall, for example a turbine airfoil, so as to retain a residual bottom plate portion. Next, an electro discharge machine (EDM), for example a rotating EDM or plunge EDM, is used for finishing at least one rough blind hole so as to create at least one finished hole and breaking through the bottom plate portion.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: March 26, 2002
    Assignee: General Electric Company
    Inventors: Marshall Gordon Jones, Steven Robert Hayashi, Bin Wei
  • Patent number: 6362447
    Abstract: It is an object of the invention to provide an electrode wire for an electrical discharge machining apparatus, which is low-priced in cost of production, has sufficient conductivity and strength at high temperature and is suited for improving the speed of electrical discharge machining. Cu—Zn alloy covering layer is formed around a core metallic wire formed of Cu—0.02 to 0.2 Zr alloy or Cu—0.15 to 0.25 Sn—0.15 to 0.25 In alloy.
    Type: Grant
    Filed: March 9, 1999
    Date of Patent: March 26, 2002
    Assignee: Hitachi Cable Ltd.
    Inventors: Kiyoshi Shimojima, Seigi Aoyama, Hideo Kawano, Koichi Tamura, Takahiro Sato, Takamitsu Kimura, Masato Watabe
  • Patent number: 6353199
    Abstract: An electric discharge machining apparatus comprises a quill 8 movable in the vertical direction, at least one set of linear motor movers attached to the quill, symmetrically about a center axis of the quill, and a single set of linear motor stators facing the set of movers. An electrode mounting device (9) for holding a tool electrode (6) is attached to a lower end of the quill, coaxially with the quill. Preferably, the set of movers includes magnetic plates (12, 14) attached to the quill and a row of permanent magnets (11, 13, 15, 16) arranged on the magnetic plates, and the set of stators includes a yoke (31, 41) and a coil (32, 42) wound around the yoke. The quill has a hole (8a) in its center extending in the vertical direction, and an air cylinder (61) providing counter balance for the load of the quill is preferably disposed in this hole.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: March 5, 2002
    Assignees: Sodick Co., Ltd., KHS Co., Ltd.
    Inventors: Akio Hosaka, Sadao Sano, Yoichi Seki
  • Publication number: 20020017503
    Abstract: The invention relates to methods and apparatus for manufacturing intravascular stents wherein the intravascular stent has its inner surface treated to promote the migration of endothelial cells onto the inner surface of the intravascular stent. In particular, the inner surface of the intravascular stent has at least one groove formed therein.
    Type: Application
    Filed: May 18, 2001
    Publication date: February 14, 2002
    Inventors: Christopher E. Banas, Julio C. Palmaz, Eugene A. Sprague
  • Publication number: 20010050269
    Abstract: It is an object of the invention to provide an electrode wire for an electrical discharge machining apparatus, which is low-priced in cost of production, has sufficient conductivity and strength at high temperature and is suited for improving the speed of electrical discharge machining. Cu—Zn alloy covering layer is formed around a core metallic wire formed of Cu-0.02 to 0.2 Zr alloy or Cu-0.15 to 0.25 Sn-0.15 to 0.25 In alloy.
    Type: Application
    Filed: March 9, 1999
    Publication date: December 13, 2001
    Inventors: KIYOSHI SHIMOJIMA, SEIGI AOYAMA, HIDEO KAWANO, KOICHI TAMURA, TAKAHIRO SATO, TAKAMITSU KIMURA, MASATO WATABE
  • Patent number: 6326576
    Abstract: An electrical discharge machining (EDM) apparatus includes at least one work station having an electrode fixedly mounted to a base and a workpiece fixture slidingly mounted to the base above the electrode. A servomotor is mounted to the base and arranged to drive the workpiece fixture toward and away from the workpiece. Preferably, the EDM apparatus will include a number of such work stations, and each work station will be connected to a separate control system for independently controlling and energizing the work station.
    Type: Grant
    Filed: September 22, 1999
    Date of Patent: December 4, 2001
    Assignee: General Electric Company
    Inventors: Rudi O. Krenz, Willem T. De Graaff, Kenneth E. Mascarenas
  • Patent number: 6326579
    Abstract: An electric discharge machine includes a machine base configured to support a work piece, a y-axis alignment assembly having a first direction of travel and mounted to the machine base, and an electrode alignment assembly mounted to the machine base and configured to hold an electrode during a machining process. The electrode alignment assembly has a second, a third, and a fourth direction of travel, and an attached rotary indexer has a fifth direction of travel. Movements in the first, second, third, fourth, and fifth directions of travel are automatically controlled by a processor.
    Type: Grant
    Filed: August 5, 1999
    Date of Patent: December 4, 2001
    Assignee: General Electric Company
    Inventors: David M. Krawczyk, Charles L. Ball
  • Patent number: 6320150
    Abstract: Disclosed is a wire electric discharge machining apparatus comprising a wire-driving system for feeding a wire electrode while opposing it to a workpiece, and a power supply unit for supplying electric power to the wire electrode, wherein electric discharge is effected between the wire electrode and the workpiece to machine the workpiece to have an arbitrary shape. The wire electrode is allowed to approach the workpiece to effect the electric discharge between the wire electrode and the workpiece so that the workpiece is machined to have an arbitrary shape, while a suction mechanism is used to remove undesirable matters including sludge together with a working fluid via cylindrical members from holes formed in the workpiece.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: November 20, 2001
    Assignee: NGK Insulators, Ltd.
    Inventor: Masayuki Hironaga
  • Patent number: 6310312
    Abstract: An automated method and apparatus for electrode discharge machining wherein method includes moving the tool holder to the electrode loader, automatically mounting an electrode into the tool holder and then testing the electrode for conformance to geometric and dimension tolerances and testing the electrode for proper alignment in the tool holder and thus proper alignment relative to the workpiece just prior to moving the tool holder to the workpiece area for machining. The apparatus includes a moveable servomechanism with a tool holder, an electrode magazine, and a sensor module for testing an electrode mounted in the tool holder. The sensor module has a recess configuration of conductive material complimentary to the electrode such that the electrode will make contact with the conductive material when inserted into the sensor module if the electrode is out of tolerance or misaligned in the tool holder.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: October 30, 2001
    Assignee: United Technologies Corporation
    Inventors: Evelitsa Higuerey, Gordon Reed, Thomas R. Davis, Wilfred Grenfell
  • Patent number: 6310313
    Abstract: Separately from an electrode jumping operation (an amount of rise of a first electrode jump (22)) aimed at discharging machining debris produced during electrical discharge machining, an electrode jumping operation (an amount of rise of a second electrode jump (23)) is inserted for which is set an amount of rise of jump with which balls or rollers used on a sliding portion of a mechanically driving part undergo one revolution or more. Further, in a case where an abnormality of a lubricant supplying unit (101) is detected, as for a program being continued, machining is stopped after the termination of the program, or machining is stopped after continuing the program within a fixed time duration, or a program other than for machining operation is made executable.
    Type: Grant
    Filed: June 12, 2000
    Date of Patent: October 30, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Mitsuaki Akune, Hajime Ogawa, Takashi Kanaya
  • Patent number: 6300588
    Abstract: A process for the manufacture of repair material. The repair material is ductile and readily mechanically deformed and can be used in the repair of turbine components. The process comprises providing a directionally solidified material, cold-swaging the directionally solidified material, and heat treating the cold-swaged material into the repair material. The repair material, after the steps of cold-swaging and heat treatment, comprises a microstructure that is essentially free from cracks, for repairing the turbine component. The invention also sets forth methods for repair of articles, such as turbine components, using the repair material, and a turbine component repaired using the repair material.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: October 9, 2001
    Assignee: General Electric Company
    Inventors: John Raymond Hughes, Melvin Robert Jackson, Charles Gitahi Mukira, Allan Richard Susi, Raymond Alan White