Abstract: cBN powder (11) which is an electrically insulating hard matter is mixed with Co-based alloy powder (12) which is a conductive matter, resultant powder mixture is put into a press mold and compression-molded to thereby form an electrode for discharge surface treatment (10). Electric discharge is generated between the electrode (10) and a treatment target material (16) by a discharge surface treatment power-supply unit (17), and a hard coat (20) made of cBN and Co-based alloy having high hardness even in a high temperature environment is formed on the treatment target material (16).

Abstract: In an electrode for electric discharge surface treatment used in electric discharge surface treatment for forming a hard coating on the surface of a treated material through the energy by generating electric discharge between the electrode and the treated material, a TiC powder (11) which is metal carbide and a TiH2 powder (12) which is metal hydride are mixed and heating treatment is performed after compression molding and hydrogen in the TiH2 powder (12) is desorbed to make a Ti powder (13) and a practical electrode (10) for electric discharge surface treatment having moderate strength and crumbliness as well as safety is formed.

Abstract: A discharge electrode comprising a material having solid lubricant effect, such as molybdenum, is used to generate discharge in a pulse form between the discharge electrode and a workpiece, the surface of which is to be treated, in working liquid containing carbon components, such as water. Material consumed or melted from the discharge electrode, generated because of the electric discharge energy based on the pulse form discharge, gets adhered to and deposited onto a surface of the workpiece thereby forming a coat having lubricant effect on the surface of the workpiece.

Abstract: WC powder (11) and W powder (12) are mixed and entered in a press mold and compressed and molded, thereby forming a discharge surface treatment electrode (10). Discharge is caused to occur between the discharge surface treatment electrode (10) and a workpiece (16) by a discharge surface treatment power unit (17), whereby a component of the discharge surface treatment electrode (10) melted by discharge heat is deposited on the workpiece (16). W, a component of the discharge surface treatment electrode (10), reacts with C, a component of work liquid (4), to produce WC and together with the WC which is a component of the discharge surface treatment electrode (10) a hard film (20) made of WC is formed on the workpiece (16). The hardness and strength of the hard film formed on the workpiece (16) by the discharge surface treatment can be enhanced.

Abstract: An electrical discharge machine for forming a small hole including an intermediate guide having an upper guide and lower guide to support an electrode for forming a small hole at two points between an electrode holder and a small hole guide and also having a chuck, which can be opened and closed, provided in each guide; a first drive unit to drive the intermediate guide in the longitudinal direction of the electrode, a second drive unit to open and close the guide chucks of the intermediate guide; and a third drive unit to variably change distance L between the upper guide and lower guide of the intermediate guide in the longitudinal direction of the electrode.

Abstract: A method of wire electric discharge machining by which an electric discharge is generated in a gap between a wire electrode (1a) and a workpiece (2) so that the workpiece (2) is machined, includes the steps of: a first step in which electric discharge machining is conducted in a dielectric liquid (4a); a second step in which electric discharge machining is conducted in mist (7); and a third step in which electric discharge machining is conducted in gas (8), such that the machining process is changed over when straightness of the workpiece (2) becomes a predetermined value. It is possible to provide a method of wire electric discharge machining, the productivity of which is high, suitable for highly accurate machining.

Abstract: The wire electric discharge machining apparatus includes apparatus or generating a discharge in a gap between a wire electrode (1a) and a machining subject (2) to machine the machining subject. A gas supplying unit (8) supplies a pressurized gas in the gap between the wire electrode and the machining subject. This wire electric discharge machining apparatus has a high productivity, and it is suitable for high-precision machining.

Abstract: The shape of each electrical supply die for contact-supplying electricity to a wire electrode is changed to a cylindrical shape, and grooves are provided in its outer surface in parallel to the traveling direction of the wire, wherein upper electric supply is effected by contact-supplying of electricity at a projecting surface formed between adjacent ones of the grooves, while lower electric supply is effected by pressure contact-supplying of electricity by causing a concave surface to contact the groove.

Abstract: A discharge surface treatment method with which discharge is caused to occur between an electrode and a workpiece to generate energy to form a coating on a surface of the workpiece, and method therefore. An electrode is made by combining a hard material, such as WC, and a soft material, such as Co. The hard and soft materials are mixed and compressed into a green compact. The green compact is baked in a vacuum furnace at a temperature which is below the sintering temperature but high enough to melt the soft material. The melted soft material fills the gaps between the particles of the hard material, resulting in an electrode having a texture similar to chalk called incomplete-sintering. The electrode is then used in discharge surface treatment.

Abstract: In a wire electric discharge machine in which the processing liquid exists between a wire electrode 2 and a work piece 3, and the work piece 3 is processed while the discharge is being generated, the wire electric discharge machine has a jetting nozzle 140 to jet the processing liquid to the work piece 3, and a wire guide portion to flow the processing liquid to the jetting nozzle 140 and to guide the wire electrode 2 into a bored hole, and the wire guide portion has the first passage 133b to flow the processing liquid into the jetting nozzle, and the second passage 131b to convert the direction of the processing liquid to be flowed into the first passage 133b.

Abstract: In the first pulse width T1 of an electric discharge current, the group of switching elements (10) are controlled by the control means (11) and the first peak value Ip1 is set at a predetermined value and the electrode material is emitted so that a predetermined quantity of electrode material can be supplied, and the thus emitted electrode material is made to adhere to the workpiece (2) so as to compose the electrode component (15a). In the second pulse width T2 of an electric discharge current, the second peak value Ip2 is set so that the emission of electrode material can be suppressed and the electrode component (15a) adhering to the workpiece (2) can be melted, and the electrode component (15a) is melted and a hard coat composed of the electrode component (15b) melted on the workpiece (2) is formed. In this way, an excellent hard coat, the crystal grains of which are fine, can be formed on the workpiece (2).

Abstract: In the discharge surface treatment method, an electrode having a cylindrical shape and a work are aligned face to face with a predetermined gap therebetween in a machining fluid. The electrode is a green compact electrode formed by compressing metal powder or powder of a metal compound or ceramics powder, or a metal electrode. A hard coat film of the material with which the electrode is made or a reactant of this material is formed on a surface of the work because of the energy generated during the electric discharge.

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.

Abstract: An upper guide and a lower guide are respectively disposed above and below a workpiece. The upper guide and the lower guide respectively has wire guides for guiding the wire electrode. A pair of electric supply dies are respectively provided in the upper guide and the lower guide and are adapted to come into contact with and energize the wire electrode. An internal nozzle and an external nozzle are provided in at least one of the upper guide and the lower guide. A first piping system supplies the working fluid to the internal nozzle and a second piping system supplies the working fluid to the external nozzle, where the second piping system is independent of the first piping system. The working fluid having lower temperature and higher pressure than the working fluid jetted out and supplied from the external nozzle is jetted out and supplied to the workpiece from the internal nozzle.

Abstract: The electrode used in processing a surface of a mold is manufactured as follows. Material powder such as metal powder or metal compound powder is filled in a female mold of the mold. Then the material powder in the female mold is press-molded using a male mold. The surface of the mold is then treated using this electrode.

Abstract: An electric discharge is generated between an electric discharge surface treatment electrode and a wire electrode, and an electric discharge surface treatment material is stuck on the surface of the wire electrode by the energy of the electric discharge. An electric discharge is then generated between a work piece and the wire electrode on which the electric discharge surface treatment material is stuck, and a surface modified layer is formed on the surface of the work piece by the energy of the electric discharge.

Abstract: An electric-discharge surface treatment method in which a compressed powder electrode obtained by compression-molding metal powder, metal compound powder, or ceramics powder, or a metal electrode is used as an electrode, and pulsed electric discharge is generated between the electrode and a material to be treated so that a hard coating composed of an electrode material or a substance obtained by reaction of the electrode material in response to energy of the electric discharge is formed on a surface of the material to be treated by the energy of the electric discharge; wherein the method uses an electrode in which carbon or graphite powder, or a substance for producing carbon in response to energy of electric discharge is mixed into the electrode material.

Abstract: A method having the steps of: securing a first electrode (120) to an indexing unit (121) which indexes the angle of the first electrode; modifying the first electrode (120) into a predetermined shape by a discharging operation of a second electrode (131) or a machining operation of a second tool connected and secured to a main shaft (112) which is moved in a vertical direction when the surface of the first electrode (120) is modified; changing the second electrode (131) or the second tool connected and secured to the main shaft (112) to a first tool (110) by an automatic tool changing unit; indexing the first electrode (120) to a predetermined angle of rotation by the indexing unit (121); causing discharge to occur while relatively moving the tip of the first tool (110) along the surface of the first electrode (120) such that the tip is made to be opposite to the surface of the first electrode (120) while a predetermined distance is being maintained; and forming a hard coating film on the tip of the first too

Abstract: There are provided an upper guide (118) and a lower guide (109) which are respectively disposed above and below a workpiece (25) and respectively incorporate wire guides for guiding a wire electrode (119); a nozzle for jetting and supplying a working fluid from at least one of the upper guide (118) and the lower guide (109) toward the workpiece (25); and a pump for supplying the working fluid to the nozzle, so that a gas is mixed into the working fluid in a channel of the working fluid from the pump to the nozzle, and the working fluid in a state of a gas-liquid mixed phase is jetted and supplied from the nozzle to the workpiece (25).

Abstract: In order to improve ease of assembly and machining accuracy of a wire electric discharge machine, the present invention constructs a column and a lower support assembly to be separated, and configures the lower support assembly to have a structure integrally composed of a proximal portion having the same sectional shape as a sectional shape of the column, and a central projecting portion that projects from a center of a bottom surface of the proximal portion to support a lower arm. Furthermore, the lower arm is attached to the central projecting portion of the lower support assembly, while a Y-axis guide guided by a Y-axis guide rail of a Y-axis guiding mechanism, for example, is attached to the bottom surface of the proximal portion of the lower support assembly. Then the proximal portion and a bottom surface of the column are connected by bolts.