Abstract: A grinding wheel which is to be rotated about its axis for grinding a workpiece, including: (a) a base disk; and (b) a plurality of abrasive segment chips which are fixed to the base disk such that the abrasive segment chips are arranged on a circle having a center at an axis of the base disk, and which have respective circumferential lengths as measured in a circumferential direction of the base circle, wherein the plurality of abrasive segment chips includes at least two abrasive segment chips having the respective circumferential lengths which are different from each other, and wherein the abrasive segment chips are arranged with substantially no gap between each pair of the abrasive segment chips which are contiguous to each other in the circumferential direction.

Abstract: A diamond tool having segment type cutting tip for cutting, grinding or drilling workpieces. The diamond tool comprising a plurality of segment type cutting tips circumferentially fixed on the wheel of the diamond tool, each of which has at least two diamond layers longitudinally disposed parallel with the rotation direction of the diamond tool, and capable of effectively cutting, grinding or drilling workpieces as forming at least two microscopic linear cutting groves in the workpieces when cutting operation.

Abstract: The invention relates to a diamond saw blade which is made by attaching improved undercut preventing tips, produced by diffusing and joining cobalt-based powder onto ultra hard tips at a high temperature, to respective shank slot walls formed on the circumference of a diamond saw blade by means of laser welding in order to remove drawbacks of high cost or insecurity with the conventional art.

Abstract: A rotary cutting saw including (a) a base disk and (b) a plurality of abrasive segments fixed to an outer circumferential surface of the base disk and are spaced apart from each other in a circumferential direction of the base disk. The base disk has a plurality of slits which are formed in the outer circumferential surface of the base disk and are located between adjacent ones of the abrasive segments in the circumferential direction. Each slit extends inwardly in a radial direction of the base disk from the outer circumferential surface of the base disk. Each of the abrasive segments includes abrasive grains and wear-resistant grains each of which has a size substantially equal to a size of each of the abrasive grains. The wear-resistant grains are exposed on a side surface of each abrasive segment and are regularly arranged on the side surface.

Abstract: A grinding wheel of segmental type including an inner cylindrical core portion, and an outer grinding portion consisting of a plurality of segments which have abrasive layers formed of abrasive grains bonded together with a glass bonding agent and which are bonded to an outer circumferential surface of the core portion with a synthetic resin layer interposed therebetween, wherein a linear thermal expansion coefficient &agr;seg (° C.) of the segments and a linear thermal expansion coefficient &agr;cor (° C.) of the core portion satisfy a formula |(&agr;cor−&agr;seg)|≦6×10−6.

Abstract: The present invention relates to a core drill wherein initial drilling workability is improved through reduced frictional resistance on the segment tips, when they are seated on the surface of an article to start cutting operation, and wherein cutting scraps or sludge produced by the segment tips are smoothly discharged through the helical grooves formed on the core body so as to reduce the friction between the core body and the cutting scraps or sludge, whereby both the cooling and cutting performance of the core drill are improved. The invention proposes a core drill with a cylindrical core body with a predetermined diameter and length and with plural cutting segments provided on the lower part of a core body at a finite interval, wherein the cutting thickness surface of the cutting segment consists of inclined sharp thickness portion for decreased frictional resistance with an article to be processed.

Abstract: A grinding wheel comprising an outer annular grinding portion, and an inner core portion which is located radially inwardly of the annular grinding portion to support the annular grinding portion and which is formed of a composition including as a major component a thermoplastic resin having a specific tensile strength of at least 12. The grinding wheel is manufactured in a process including a step of crushing the core portion of the used grinding wheel into pellets to be reclaimed as a material for the core portion, a step of preparing a composition for the core portion, which includes a mass of the pellets and a fresh thermoplastic resin having a specific tensile strength of at least 12, and a step of forming the core portion by using the composition in a molten state. The process may further include a step of reclaiming the grinding portion of the used grinding wheel.

Abstract: A method for making a sintered article comprising providing a plurality of individual blocks of sinterable matrix material, arranging said blocks in abutting relationship to form an assembly of said blocks in a sinter mold wherein said assembly comprises a plurality of said blocks extending in at least one direction thereof and sintering said assembly under pressure in the mold to form an integrated sintered article. The blocks may contain abrasive particles to provide a sintered abrasive article and individual abrasive segments may be extracted from the article.

Abstract: A vitrified grindstone having a vitrified abrasive structure which has pores and which includes abrasive grains and an inorganic bonding agent that holds the abrasive grains together, wherein 10-95% of a total volume of the pores is filled with a cured resin. The vitrified abrasive structure may further include an aggregate such that the abrasive grains and the aggregate are held together by the inorganic bonding agent.

Abstract: A cutting element having a cutting table made from sheet segments of commingled ultra hard material and binder. Each segment may be made from a finer or a coarser grade of ultra hard material or from different types of ultra hard material. The segments are aligned side by side over a cutting face of the cutting element to form the cutting table. The material grade and/or the material type of each segment may alternate across the cutting face.

Abstract: A cutting and grinding wheel made of a circular disk having a center, two opposing surfaces, an outer circumference, and a center defining a bore hole. A plurality of teeth are evenly distributed around the disk's outer circumference, with each tooth having an apex and a pair of opposing sidewalls generally parallel to the disk opposing surfaces. The teeth formed in a generally sinusoidal pattern, and each adjacent pair of teeth are separated by a gullet. An abrasive coating is disposed to be concentrated upon the wheel teeth apexes and opposing teeth sidewalls.

Abstract: A grinding wheel which is to be rotated about its axis for grinding a workpiece, including: (a) a base disk; and (b) a plurality of abrasive segment chips which are fixed to the base disk such that the abrasive segment chips are arranged on a circle having a center at an axis of the base disk, and which have respective circumferential lengths as measured in a circumferential direction of the base circle, wherein the plurality of abrasive segment chips includes at least two abrasive segment chips having the respective circumferential lengths which are different from each other, and wherein the abrasive segment chips are arranged with substantially no gap between each pair of the abrasive segment chips which are contiguous to each other in the circumferential direction.

Abstract: A cylindrical, abrasive grinding wheel having a cylindrical abrasive region with an abrasive surface at an outer circular band thereof. The abrasive region includes layers of abrasive particles. The layers of abrasive particles can be tilted with respect to an axis of rotation of the grinding wheel or they can such that grooving in the grinding wheel and a workpiece ground by the grinding wheel can be reduced. Alternatively, the abrasive region can be formed from a plurality of abrasive segments each having layers of abrasive particles. The layers of abrasive particles can be staggered in the direction of the axis of rotation from one segment to another. This can also reduce grooving in the grinding wheel and workpieces.

Abstract: A cutting element having a cutting table made from sheet segments of commingled ultra hard material and binder. Each segment may be made from a finer or a coarser grade of ultra hard material or from different types of ultra hard material. The segments are aligned side by side over a cutting face of the cutting element to form the cutting table. The material grade and/or the material type of each segment may alternate across the cutting face.

Abstract: A rotary tool for the erasure-type abrading of adhesive residues and foil, in particular, from lacquered metal surfaces has an outer tooth crown of rubber or an elastomeric synthetic resin, the teeth being bendable. The tooth disk is mounted on a disk-shaped holder which is rotatably driven and is coupled to the latter by an inner crown.

Abstract: A grinding wheel includes a carrier wheel and a grinding layer formed on a peripheral surface of the carrier wheel. The grinding layer includes grinding segments and cup-shaped or scoop-shaped openings between the grinding segments.

Abstract: A vitrified grindstone having a vitrified abrasive structure which has pores and which includes abrasive grains and an inorganic bonding agent that holds the abrasive grains together, wherein 10-95% of a total volume of the pores is filled with a cured resin. The vitrified abrasive structure may further include an aggregate such that the abrasive grains and the aggregate are held together by the inorganic bonding agent.

Abstract: An object of the invention is to provide a core drill for drilling a fine hole which can securely fix an abrasive grain to a core material, can finish to a predetermined diameter in a relatively easy manner, and can manufacture one having a superfine diameter about some &mgr;m, and a method of manufacturing the same. A core drill for drilling a fine hole in accordance with the invention for achieving the object is structured such as to drill a fine hole onto a work, or grind an inner diameter of the drilled fine hole to a predetermined shape, and characterized by bundling ceramics long fibers so as to make a core material, impregnating the core material with a molten synthetic resin so as to harden, and holding an abrasive grain by the synthetic resin.

Abstract: Structurally independent cutting members are formed with abrasive material comprising a plurality of particles protruding through a surface of the retaining material comprising a mesh material for durable cutting members; and, the structurally independent cutting members are selectively continuous or discontinuous and spatially mounted along the working edge of a core. Some of the cutting members or portions of the cutting members are arranged for stock removal, and some are arranged for gauge keeping. Since the individual portions of the cutting portions are separate, more stock removal portions can be included, with fewer gauge keeping portions as may be required. The structurally independent cutting members may have a variety of profile shapes, such as contoured configurations to provide stock removal using high pressure cutting forces applied normal to the cutting face of the workpiece and gauge keeping functions using low pressure cutting forces applied laterally to the cutting face to the workpiece.

Abstract: A tool for treatment of rock, masonry or concrete by drilling, grinding or cutting off, the tool has a plurality of cutting segments each having a plurality of bonded cutting bodies formed as diamond crystals and subjected to an abrasive wear during an operation, a tool base body which carries the cutting segments, and at least one marking provided on at least one segment and forming a wear indicator, the at least one marking being arranged so that it changes during operation of the tool with wear of the cutting segments.

Abstract: The present invention discloses a new surface geometry of a polycrystalline diamond (PCD) cutter whereby large chips are prevented from forming in front of the cutter. The surface geometry includes recess(es) and/or raised region(s) that can act as chip breakers and also increase turbulence in the flow across the face of the cutter and thus increase the Heat transfer coefficient and reduce drag. PCD surface's geometric configuration is formed in the high temperature/high heat (HT/HP) process and is therefore integral with the cutter. This invention thus provides a polycrystalline cutter with improved cutting capability by preventing chip build up and enhanced heat transfer resulting in a cooler cutting edge temperature.

Abstract: The present invention describes a diamond tool with diamond bonded chemically by a braze that contains either Cr, Mn, SI, or Al or mixtures or alloys thereof. The diamond tool is made by infiltrating the braze into a matrix metal that contains diamond in either form of grits or polycrystalline bodies.

Abstract: The present invention relates to a cutting tool and to the method for manufacture thereof. Structurally, the cutting tool (1) in question is provided with an abrasive peripheral surface (2) arranged on the outside of a rigid central core (3) made of a high-rigidity composite material (carbon fibers, glass fibers, synthetic material fibers, carbon fibers bonded with high molecular-weight polymer filaments, carbon fibers bonded with kevlar fibers, sintered carbon) designed to ensure the rigidity of the cutting tool (1) and limit the transmission and amplification of sound waves across the central core (3). The abrasive peripheral surface (2) is preferably formed on a cutting element (5) fixed to an external support (6) rigidly connected to the central core (3) by means of fixing means (7).

Abstract: Improved abrasive tools and apparatus and method for the manufacture of the improved abrasive tools and the like which includes apparatus and a method for the creation of a structurally viable matrix having a pattern of abrasive elements which can be shaped, cut and positioned for permanent disposition on a rigid tool body. The apparatus includes a release layer on a transversely magnetized base surface with magnetic protrusions to provide a mosaic-like surface. Magnetizable abrasive particles applied to the release layer orient themselves magnetically to form generally conic stacks which having a stack axis and a distal working portion. The stacks define a working surface which is then coated. Prior to solidification of the coating the cones may be shaped or raked magnetically. A braze paste is applied to encapsulate the cones and form a flexible support web between the cones.

Abstract: The invention relates to a saw blade for cutting, slotting or grooving natural rock and synthetic construction materials, such as concrete, reinforced concrete, brick, asphalt or the like. The saw blade has a sawblade body and a plurality of segments which are arranged on the circumference of the sawblade body and are provided with radially projecting lugs which each bear an abrasive body. The segments are attached to the sawblade body by means of a thermally decoupling tongue-and-groove joint.

Abstract: The present invention describes a diamond tool with diamond bonded chemically by a braze that contains either Cr, Mn, SI, or Al or mixtures or alloys thereof. The diamond tool is made by infiltrating the braze into a matrix metal that contains diamond in either form of grits or polycrystalline bodies.

Abstract: Segmented cutting tools such core drill bits and diamond saw blades can be made more efficient by hardening a portion of the sides of each of the segments.

Abstract: A method for precision cylindrical grinding of hard brittle materials, such as ceramics or glass and composites comprising ceramics or glass, provides material removal rates as high as 19-380 cm.sup.3 /min/cm. The abrasive tools used in the method comprise a strong, light weight wheel core bonded to a continuous rim of abrasive segments containing superabrasive grain in a dense metal bond matrix.

Abstract: A unitary composite abrasive disc for one-pass grinding and finishing of a workpiece comprising a flexible epoxy rim bonded to a rigid core.

Abstract: A diamond-charged abrasive layer (3) of a grinding wheel has a convex profile over at least part of its length (L) in order to have greater resistance to wear. Also provided is a machine for grinding ophthalmic lenses which employs the grinding wheel.

Abstract: An abrasive tool for cutting extremely abrasive-resistant materials includes a novel, abrasive segment with a generally crenelated, rectangular appearance. The segment has a single piece vein of a primary abrasive and first bond material extending completely along the length of the segment. The vein transverses the width of the segment at least once in a non-linear path and alternately coincides with inner and outer faces. Gaps between the vein and the faces opposite the vein coincident faces are occupied by a second bond material, and optionally, a secondary abrasive, thus forming multiple, separated abrasive regions. The bottom surface of the segment is attached to a core at an operative perimeter which defines the cutting edge of the tool. The segment can be adapted to conform to the curvature of diverse cutting edges, and thus can be used in rotary and reciprocating saw blades and core drilling bits.

Abstract: A drill bit is provided with a cylindrical body portion fabricated from a plastic material. The body portion is fastened in concentric, end to end relation to a cylindrical cutter fabricated from a metallic material and having an array of cutting elements disposed thereon. The body portion and cutter are preferably tubular, wherein the cutting elements are disposed in an annular array, to facilitate core or crown drilling operations. The wall thickness of the tubular body portion may be increased relative that of the cutter to compensate for wear during drilling.

Abstract: Grinding tool including a basic body symmetric with respect to rotation and a grinding layer deposited on the periphery of said grinding tool. The grinding layer being composed of the grinding grains, bonding agent and occasionally filler and/or wear-changing additives. The outer radius of the annular grinding layer or the extension in feeding direction perpendicular to the axis of the basic body is different, with the physical properties and/or the volume contents of the components of the layer are different in axial direction such that an adaptation to the different grinding load continuously in axial direction is achieved.

Abstract: Structurally independent cutting members are formed with abrasive material comprising a plurality of particles protruding through a surface of the retaining material comprising a mesh material for durable cutting members; and, the structurally independent cutting members are selectively continuous or discontinuous and spatially mounted along the working edge of a core. Some of the cutting members or portions of the cutting members are arranged for stock removal, and some are arranged for gauge keeping. Since the individual portions of the cutting portions are separate, more stock removal portions can be included, with fewer gauge keeping portions as may be required. The structurally independent cutting members may have a variety of profile shapes, such as contoured configurations to provide stock removal using high pressure cutting forces applied normal to the cutting face of the workpiece and gauge keeping functions using low pressure cutting forces applied laterally to the cutting face to the workpiece.

Abstract: The subject invention is a cutting disc having a plurality of radial slots connecting with the peripheral edge of the disc which form multiple tabs integrally mounted to the cutting disc with the tabs protruding outwardly from the peripheral edge of the cutting disc. There is at least one tab for each support segment located between directly adjacent radial slots. When fixedly mounting of the cutting segments into the support segments, the cutting segment is also fixed to a tab.

Abstract: A cutting compact has a superhard abrasive layer bonded to a substrate layer, wherein the configuration of the interface between abrasive and substrate layers is a non-planar, or three dimensional, interface which increases the surface area between the layers available for bonding and optimizes the structural integrity of the compact according to its desired application. In one embodiment, the topography between the substrate and abrasive layers of the compact is characterized by interlocking concentric circular grooves and channels of varying width, depth and shape. In another embodiment, the interface between the grooves and channels is rounded and smooth. In additional embodiments, the grooves and channels are positioned on substantially angled interfaces or substantially curved interfaces. Additional configurations of the present invention provide that the grooves alternatingly start and stop along the path in interfacing with their respective channels.

Abstract: A blade comprises a disc-shaped substrate having a major surface and an outer peripheral edge portion encircling the major surface, and an abrasive grain layer mounted on the outer peripheral edge portion of the substrate. The substrate includes a first disc having a major surface, and a second disc having a major surface which is superposed on that of the first disc. The major surface of the second disc is separated from that of the first disc, thereby defining a clearance between the major surfaces of the first and second discs and correspondingly forming a convex surface region on the outside surface of the substrate. The peripheral portion of the convex surface region is provided with a contact portion where the major surfaces of the first and second discs are slidably in contact with each other.

Abstract: The invention relates to abrasive grinding wheels with an organic binder, comprising a reinforcement in the form of metal fibers. Preferably, those fibers are in the form of "vitreous" metallic ribbons.The grinding wheels according to the invention are advantageously more durable and more conductive.

Abstract: A mounting for use in mounting rotating cutting blades to the drive shaft of saws is provided. The mounting is an arbor or arbor sleeve having a non-symmetrical outer mounting surface onto which is mounted a cutting blade which contains a similarly configured mounting hole. The arbor or arbor sleeve is designed for use with a cutting blade having a mounting hole which, when viewed from one side of the blade is the same as the outer surface mounting surface, and which viewed from the other side of the blade is not the same. The use of the arbor or arbor sleeve of the present invention with a cutting blade having these characteristics results in the blade being mounted on the saw in only one orientation.

Abstract: A power transmission belt having an endless body with a length and defining an elongate rib. The body has an inside, an outside, and laterally spaced sides. The rib has an exposed surface to engage with a cooperating pulley. At least a first portion of the exposed rib surface is formed by at least one of grinding and cutting. There is a second portion of the exposed surface that is neither cut nor ground during formation of the power transmission belt.

Abstract: Abrasive tools with preferential arrangements and patterns of abrasive elements which accomplish a range of performance goals and optimize both removal rate and finish are disclosed.

Abstract: The present invention is related to an abrasive tool comprising a core and abrasive segments attached to said core wherein said abrasive segments comprise a bond material and superabrasive grains and wherein said segments comprise at least two circumferentially spaced regions and wherein said superabrasive grains are alternately dispersed in said regions in high and low concentrations of superabrasive grains. The present invention is further related to an abrasive tool comprising a core and abrasive segments attached to said core wherein said abrasive segments comprise a bond material and superabrasive grains, wherein said abrasive segments comprise at least two circumferentially spaced regions and wherein said superabrasive grains are alternately dispersed in every other region.

Abstract: A saw comprises a saw blade having an outer edge, and a diamond-containing coating carried on the outer edge of the saw blade, the saw blade being composed of a synthetic plastic reinforced with a fiber material composed of a plurality of fibers with a volume fraction of 30-70%.

Abstract: The abrasive polishing device has a carrier, typically in the form of a rotatable polishing head (10) and abrasive polishing pads (16) mounted on the carrier. Each polishing pad (16) includes an abrasive body (18) which is provided by a thermoplastic polymer impregnated with ultrahard abrasive particles and which presents an abrasive polishing surface for performing an abrasive polishing action in use. The abrasive body (18) is formed with a regular array of recesses, typically narrow capillarytype passages therein which extend to the abrasive surface. The recesses result in improved cooling of the abrasive layer during a polishing operation.

Abstract: A rotating cutting blade and its drive motor are mounted on a wheeled support platform. The blade extends through a skid plate depending from the platform, in order to cut the concrete below the skid plate. The slot in the skid plate has its ends configured to fit within predetermined distances of the corresponding ends of cutting segments on the cutting blade. The cutting segments are configured to have a generally inverted "T" configuration in which a central cutting segment extends radially outward from two cutting segments located on opposite sides of the central segment. The exterior edges of the cutting segments may be square or rounded. The juncture between the central and shoulder segments may be square or rounded. The concrete is advantageously cut before it hardens to 1200 psi, without the use of an added lubricant, or above that hardness with lubricant if the cutting blade is supported within a sufficiently close distance by a skid plate.

Abstract: An abrasive tool such as a drill bit has a body with a working face (10). Undercut recesses (12) are formed in the working face (10). Cutting inserts (16) which present working ends (20) are located in the recesses (12). Locking means (24) in the recesses engage between the undercuts (14) and formations (22) on the inserts (16). This locks the inserts (16) against withdrawal from the recesses (12).

Abstract: A base blade for circular saw blades or abrasive cutting disks, comprising of a circular disk body fabricated at least partially of plastic material reinforced with embedded fibers. The fibers are arranged in many fiber layers laying upon one another which are connected without gaps, are plane, circular-disk shaped, and concentric to the disk body. In a first type of fiber layer, the fibers are arranged with respect to the body of the disk in an at least approximately radial direction in straight lines, and are arranged in a uniform distribution along the entire extent. In a second type of fiber layer, the fibers run essentially concentrically to the disk body in an at least approximately circular manner. The two types of fiber layers are arranged in the disk body in a distribution chosen as a function of the size of the disk body.

Abstract: A grinding tool bit is formed of a disk-shaped base member (1) with a central through opening (6) for attaching the base member to a drive spindle of a machine tool. The base member (1) is covered with individual cutting elements (4) at the radially outer circumferential surface (2) and in the side faces (3) adjacent the outer circumferential surface (2).

Abstract: Diamond cutting tools such as a diamond core drill and a disk-shaped diamond saw which are used to grind and cut hard articles in order to bore or cut hard articles. The diamond cutting tools comprise a tool body and a diamond blade portion attached to an outer end of the tool body. The diamond blade portion has a plurality of outer cuts formed at an outer end thereof and a plurality of inner slots formed under and between the outer cuts and higher than the bottoms of outer cuts by a certain depth. The diamond cutting tools can carry out effectively boring or cutting work until the expensive diamond blade portion is completely worn away.