Abstract: An apparatus and a method for mirror surface grinding which enables high quality, stable ELID grinding; and a grinding wheel for electrolytic dressing. The apparatus comprises a grinding wheel 3 having a contact surface 2 for contacting a workpiece 1, an electrode 4 facing the surface 2, nozzles 5 for supplying conductive fluid between the grinding wheel 3 and the electrode 4, and a power source 6 and feeder 7 for applying a voltage between the grinding wheel and the electrode 4. The bond material, which is selected from among iron, ferrous metal, cobalt, nickel and combinations of two or more thereof, along with grains and sintering aid are molded together and sintered to obtain the conductive grinding wheel. Next, a conductive water-soluble grinding fluid containing an alkanolamine and anions is supplied between the grinding wheel and the electrode, and a pulse wave voltage is applied between the grinding wheel and the electrode to dress the grinding wheel electrolytically during grinding.

Abstract: A superconductor wire comprising an inner core and an outer ring covering the core, wherein one of the inner core and the outer ring comprises a sintered silver powder and the other of the inner core and the outer ring on the core comprises a sintered oxide superconductor powder.

Abstract: A process for production of superconductor wire having multiple rings, comprising the steps of: preparing a silver mixture comprising a silver or silver-gold alloy mixed with a bonding agent, and a superconductor mixture comprising a superconductor powder with bonding agent; arranging both the silver mixture and the superconductor mixture in a extrusion die; extruding a wire having at least one ring of the superconductor mixture and one ring of the silver mixture in the radial direction; and heating the wire at the sinter temperature of the oxide superconductor so that the bonding agent is removed and the oxide superconductor powder and the silver powder are sintered. A superconductor wire comprising an inner core and an outer ring covering the core, wherein one of the ring on the core comprises a sintered silver powder and the other of the ring on the core comprises a sintered oxide superconductor powder.

Abstract: A device for vibrating a workpiece to be processed, serves as a workpiece table to be used to processing the workpiece by means of a rotating tool having a grindstone. The device comprises a table for supporting the workpiece and a base to be detachably furnished to the table of a processing machine. The table is supported on the base via a plurality of piezoelectric actuators each of which is connected electrically to an external controller for vibrating the workpiece being processed by actuating selectively a driving voltage from the controller. The piezoelectric actuator is a laminated piezoelectric element, at least one end of which is secured to the base.

Abstract: A machining tool is provided with an electric discharge truing/dressing apparatus comprising a spindle stock for containing and supporting a workpiece spindle which is driven for rotation while holding a workpiece or an electrode; a tool rest which moves parallel and perpendicular to the spindle of the spindle stock and holds an electrode machining tool and a grinding wheel; a feed electricity means disposed between a workpiece supporting portion of the spindle and the tool rest; a magazine disposed at an outside area of a machining area of the tool rest and adapted to store the workpiece and the electrode; and a loading device disposed between the magazine and the spindle. The grinding wheel on the tool rest is subjected to truing/dressing by feeding the electrode from the magazine to the spindle stock.

Abstract: Short, fine fibers having certain aspect ratios and generally triangular cross-section are mixed with particulate material whereby the fibers form a three dimensional network and the mixture is sintered to provide composites containing scattered and enveloped particulate material, which composites have utility as self-lubricating materials or grinding materials.

Abstract: As a grinder is being rotated, an outer circumference thereof and a metal block of raw material are pressed at determined speed or under determined pressure, and the grinder cuts the block on its surface so as to generate short metal fibers of not more than about 15 .mu.m calculated as diameter and not more than about 400 .mu.m in length by contacting between each of abrasive grains held in a matrix of the grinder and the surface of the raw material.

Abstract: Short metal fibers are directly produced from a work metal block. The product fibers are very thin and short, e.g., 200 .mu.m in diameter and 20 mm in length to the maximum. A bar like or pillar like metal bar is rotated, to which an elastic cutting tool is contacted. The entering width of cutting edge corresponds to length of fiber to be obtained. The tool is effected with fine feed and at the same time positively generated with self excited vibrations. The self excited vibration forcibly separates and divides a thin layer fiber accumulating at the cutting edge of the tool one by one without having connections in length of the fibers to each other. The process produces needle like fibers of microscopic cross sectional area. The thin and short metal fibers are produced in the same number as number of the self excited vibrations, and the fiber is right angled in axis with the cutting direction.

Abstract: A magnetic attraction system grinding method and apparatus comprised of arranging a magnetic circuit forming means between an abrasive tool and a workpiece, thereby generating a grinding pressure required to grind the surface of the workpiece, and performing the operation of the abrasive tool through a rectilinearly reciprocating movement or rotary movement working along the workpiece surface during the application of grinding pressure while controlling either grinding speed or grinding stroke. The magnetic circuit is produced with an electromagnet or permanent magnet assembly and the abrasive tool may be a magnetic material bonded grindstone.

Abstract: The present invention is concerned with a steel fiber for reinforcing concrete. The steel fiber according to the present invention is a needle-shaped chip resulting from directly machining a steel ingot material. The fiber has a wrinkled surface with a plurality of rugged waves along the length of the fiber. This new production employs a plain milling cutter having a plurality of cutting edges of negative rake angle and twist angle with respect to an axis of the cutter for machining the ingot material by a down-cut milling under conditions of high speed and short depth of cut.

Abstract: Proposed models are used for forming into destined shapes liquid, slurry, soft, sheet or lump materials, and are provided with endurance for many times of use and excellent permeability. A basic feature is that aggregates are ferrous or non-ferrous metallic grains and ceramic grains, to which a binder contained in evaporating or consumable substance is added and kneaded, and sintered. The mode has a close hardened layer scattered with metallic oxides on at least a shell. The hardened layer has fine air vents in its thickness. The whole body of a model is 5 to 60% of porosity and more than 100 Kg/cm.sup.2 of compression strength.

Abstract: A punch is pressed on a blankpiece into a die. The die is filled with liquid therein, whereby hydraulic counterpressure is generated by said pressing. The pressed blankpiece is forcibly followed in shape around the punch by hydraulic counterpressure, while part of the hydraulic counterpressure is automatically supplied to an outer circumference of the blankpiece via bypath passage. In case, the blankpiece is a plate, said supplied hydraulic pressure serves as compression force from the outer circumference of the flange to the radius direction. In case, the blankpiece is a product formed by a first drawing, said pressure serves as pressing force toward axial direction of a side wall of the product. When the supplied hydraulic pressure flows out from a space between the punch and a blank holder, the liquid serves as lubrication on an upper and lower surfaces of the blankpiece.

Abstract: Apparatus for cancelling undesired signals for a radient energy receiver having first and second antennas which are spaced a distance apart and including a phase compensation circuit connected to one of the antennas and a variable phase shift circuit connected to the second antenna with the variable phase shift circuit comprising a plurality of series connected inductors wherein adjacent inductors are magnetically coupled together and a plurality of voltage variable capacitors with adjacent ones of the voltage variable capacitors connected between ground and the junction points between adjacent ones of the series connected inductors and adding means connected to the outputs of the phase compensation circuit and the variable phase shift circuit and means for supplying a variable DC voltage to the variable voltage capacitors to control their capacitance.

Abstract: This invention is concerned with the production of steel fiber by machining a thick steel plate or block for reinforced concrete, where a milling cutter having a plurality of cutting edges is positioned on the steel plate or block and is moved relatively in the horizontal direction. A surface of said plate or block is machined by the rotating cutting edges to chop steel fibers of approximate triangular in cross section. According to this method, steel fibers of high quality may be economically produced.

Abstract: A punching die which may be economically produced is disclosed herein. The die is reinforced by superimposing hard thin plates thereon. The punching die is composed of a die body soft enough to be machined and a thin plate, single or plural, which is harder than the die body. The plate has a hole coinciding with a configuration of a product to be punched. The superimposed plate is characterized in that it remains after a product has been punched out from said thin plate by the die body and the punch. The punching die may be easily operated during production. The procedure involves only slight abrasion of the shape. The device is highly durable and precise and operates without causing curvature in the product. Thus, it is suitable for mass production.

Abstract: When bend working a metallic material using a suitable counterpressure against the material concurrently with the application of the bending force, and using a pair of dies having the distance therebetween controlled to be 3.5 to 6 times the thickness of the material, very precise bending deformation region can be easily and stably obtained without any defects, such as camber, looseness, fin, cracks or breaks.