Abstract: A vitrified grinding stone includes: abrasive grains; an inorganic binder that binds the abrasive grains; and air-communicating pores that are formed between the abrasive grains and the inorganic binder, micro-capsules that each encapsulate a lubricant and each have a diameter that is smaller than that of the air-communicating pore, being fixed on an inner wall surface of each of the air-communicating pores by an adhesive.

Abstract: A milling tool includes a cylindrical base and a plurality of abrasive grain clusters. The cylindrical base is centrally formed with a through-hole, and has an annular surface extending around the through-hole, a peripheral surface extending perpendicularly to the annular surface, and an inclined or rounded surface connecting the annular and peripheral surfaces. The annular surface is formed with a circular recess groove coaxially with the through-hole for separating the annular surface into first and second planar areas that respectively are closer to and farther from the peripheral surface. The second planar area is higher than the first planar area. Abrasive grains are brazed on the annular surface. The abrasive grain clusters are brazed on the inclined surface at predetermined intervals, each cluster including a predetermined number of abrasive grains having substantially the same diameter, each cluster being positioned substantially on a circumference almost equidistant from one another.

Abstract: A vitrified grinding stone includes: abrasive grains; an inorganic binder that binds the abrasive grains; and air-communicating pores that are formed between the abrasive grains and the inorganic binder, micro-capsules that each encapsulate a lubricant and each have a diameter that is smaller than that of the air-communicating pore, being fixed on an inner wall surface of each of the air-communicating pores by an adhesive.

Abstract: A milling tool includes a cylindrical base and a plurality of abrasive grain clusters. The cylindrical base is centrally formed with a through-hole, and has an annular surface extending around the through-hole, a peripheral surface extending perpendicularly to the annular surface, and an inclined or rounded surface connecting the annular and peripheral surfaces. The annular surface is formed with a circular recess groove coaxially with the through-hole for separating the annular surface into first and second planar areas that respectively are closer to and farther from the peripheral surface. The second planar area is higher than the first planar area. Abrasive grains are brazed on the annular surface. The abrasive grain clusters are brazed on the inclined surface at predetermined intervals, each cluster including a predetermined number of abrasive grains having substantially the same diameter, each cluster being positioned substantially on a circumference almost equidistant from one another.

Abstract: A CMP pad conditioner is provided with a grinding part formed by fixing abrasive grains on a metal base by soldering, wherein the grinding part has a flat part near an inner periphery and an inclined part near an outer periphery, wherein abrasive grains having regular shapes are fixed to the flat part, and wherein abrasive grains having acute shapes are fixed to the inclined part.

Abstract: A CMP pad conditioner is provided with a grinding part formed by fixing abrasive grains on a metal base by soldering, wherein the grinding part has a flat part near an inner periphery and an inclined part near an outer periphery, wherein abrasive grains having regular shapes are fixed to the flat part, and wherein abrasive grains having acute shapes are fixed to the inclined part.

Abstract: A vitrified grinding stone includes an abrasive grain and a vitrified binder. The vitrified grinding stone has a porosity, a degree of concentration of abrasive grains and an abrasive grain diameter according to a preset processing efficiency and a processing precision of grinding.

Abstract: A grinding wheel including: (a) an annular core body which includes a multiplicity of aggregate particles and a resin bond that holds said aggregate particles together; (b) an abrasive layer which is disposed radially outwardly of said annular core body and which includes a multiplicity of abrasive grains and a vitrified bond that holds said abrasive grains together; and (c) an impermeable coating which is formed of a synthetic resin, and which is disposed on said annular core body.

Abstract: A rotary cutting saw includes a base disk; and a plurality of abrasive segments which are fixed to an outer circumferential surface of the base disk, and which have respective outer surfaces cooperating with each other to constitute an outer circumferential surface of the rotary cutting saw; wherein each of the abrasive segments has at least one recess opening in the outer surface thereof; wherein each of the at least one recess has a radially outer portion and a radially inner portion which is located inwardly of the radially outer portion as viewed in a radial direction of the base disk; and wherein the radially outer portion has a width that is constant in the radial direction, and the radially inner portion has a width that varies in the radial direction.

Abstract: A CMP pad conditioner including: (a) a disk-shaped substrate having a working surface which is provided by one of its axially opposite end surfaces and which is to be brought into contact with the CMP pad; and (b) abrasive grains which are fixed to the working surface. The substrate includes a radially inner portion and a radially outer portion which is located radially outwardly of the radially inner portion. The working surface in the radially outer portion is inclined with respect to the working surface in the radially inner portion, such that a thickness of the radially outer portion as measured in an axial direction of the substrate is reduced as viewed in a direction away from an axis of the substrate toward a periphery of the substrate. A ratio of an outside diameter of the radially inner portion to an outside diameter of the substrate is 60–85%.

Abstract: A rotary cutting saw including: (a) a base disk which has a plurality of apertures formed therethrough and opening in axially opposite end surfaces thereof; (b) a plurality of abrasive segments which are fixed to an outer circumferential surface of the base disk; and (c) a plurality of axial-runout restraining members which are received in the apertures. Each of the axial-runout restraining members has a size which is smaller than a size of each of the apertures, such that a clearance is defined between the periphery of each of the apertures and a corresponding one of the axial-runout restraining members which is received in the each of the apertures. A ratio of a size of the clearance to the size of each of the axial-runout restraining members is 5–150%.

Abstract: A rotary cutting saw including: (a) a base disk which has a plurality of apertures formed therethrough and opening in axially opposite end surfaces thereof; (b) a plurality of abrasive segments which are fixed to an outer circumferential surface of the base disk; and (c) a plurality of axial-runout restraining members which are received in the apertures. Each of the axial-runout restraining members has a size which is smaller than a size of each of the apertures, such that a clearance is defined between the periphery of each of the apertures and a corresponding one of the axial-runout restraining members which is received in the each of the apertures. A ratio of a size of the clearance to the size of each of the axial-runout restraining members is 5-150%.

Abstract: A grinding wheel having a tool portion formed by firmly fixing diamond grains to an end face of a cup-shaped core by brazing. A circumferentially continuous groove is formed in a substantially central portion of the end face of the core. The abrasive grains are firmly fixed to an end face portion excluding regions near an outer rim and near an inner rim of the end face and near the boundaries with the groove under the condition that, with respect to all the abrasive grains, skirts of a brazing material layer for holding the abrasive grains have a length one or more times an average grain size of the abrasive grains. The provision of the groove in the end face of the core can enhance the capability of ejecting chips that occur during machining; besides, chips can be captured in the groove to preclude the occurrence of scratches resulting from the chips.

Abstract: A grinding wheel including: (a) an annular core body which includes a multiplicity of aggregate particles and a resin bond that holds said aggregate particles together; (b) an abrasive layer which is disposed radially outwardly of said annular core body and which includes a multiplicity of abrasive grains and a vitrified bond that holds said abrasive grains together; and (c) an impermeable coating which is formed of a synthetic resin, and which is disposed on said annular core body.

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.