Abstract: A polishing brush (1) includes a rod-shaped member (2) and a grinding element bundle (4) formed of a plurality of wire-shaped grinding elements (3). The rod-shaped member (2) has a holding hole (6) at a front portion (2a) to hold the grinding element bundle (4). The holding hole (6) has a bottom face (7) and a sleeve-shaped peripheral wall (8) extending from the bottom face (7) in an inclination direction (S). The grinding element bundle (4) has a seated portion (4a) seated in the holding hole (6) and a protruding portion (4b) protruding from an opening (6a) of the holding hole (6) in the inclination direction (S). The tip end of the protruding portion (4b) is located on the outside of the rod-shaped member (2) when viewed from the axis (L0) direction.

Abstract: A polishing device (1) includes a polishing brush (3) and a polishing brush holder (4) that holds the polishing brush (3). The polishing brush holder (4) includes a shank (6), a support mechanism (21) that has a sleeve (7) and supports the polishing brush (3) so as to be movable in an axial direction L of the shank (6), and a moving mechanism (22) that moves the polishing brush (3) in the axial direction L. The polishing brush holder (4) includes a pressure sensor (53) that detects a load (sensor detection pressure (P)) applied from a workpiece (W) to the polishing brush (3) when the workpiece (W) is polished by the polishing brush (3) supported by the support mechanism (21), and a control unit (51) that drives the moving mechanism (22) on the basis of the output (sensor detection pressure (P)) from the pressure sensor (53) to move the polishing brush (3) in the axial direction L.

Abstract: A wheel brush (1) includes a grinding element bundle holder (3) having an annular grinding element bundle-holding surface (12) that faces the outer circumferential side and a plurality of grinding element bundles (4) that are formed by gathering a plurality of wire-shaped grinding elements (5). The grinding element bundle-holding surface (12) has a plurality of holding holes (16) arrayed in a circumferential direction (R), the grinding element bundles (4) protrude to the outer circumferential side from the grinding element bundle-holding surface (12) while one end portions are inserted into the holding holes (16). First protrusions (18) protruding to the outer circumferential direction are provided on first opening edge portions (17a) adjacent to the holding holes 16 at a first direction (L1) side in the rotational center line direction orthogonal to the circumferential direction R (R) in opening edges of the holding holes (16) in the grinding element bundle-holding surface (12).

Abstract: A brush-like grinding stone (3) in a polishing brush (1) includes a brush holder (6) and a linear member aggregate (7) detachably held in the brush holder (6). The linear member aggregate (7) includes a large number of bundles (51) of the linear members (50) obtained by hardening aggregated yarn of inorganic filaments impregnated with a resin, and a brush holder (70) holding ends of the bundles (51). A linear member holder (70) in the linear member aggregate (7) is detachably attached to each of a plurality of holding holes (68) that is open in one side in an axial line direction L. In a case where any of the linear member aggregates has a failure, such as breakage, only the failed linear member aggregate needs to be replaced. Thus, it is not necessary to discard the entire brush-like grinding stone. Consequently, the polishing cost can be reduced.

Abstract: A brush-like grinding stone (3) in a polishing brush (1) includes a brush holder (6) and a linear member aggregate (7) detachably held in the brush holder (6). The linear member aggregate (7) includes a large number of bundles (51) of the linear members (50) obtained by hardening aggregated yarn of inorganic filaments impregnated with a resin, and a brush holder (70) holding ends of the bundles (51). A linear member holder (70) in the linear member aggregate (7) is detachably attached to each of a plurality of holding holes (68) that is open in one side in an axial line direction L. In a case where any of the linear member aggregates has a failure, such as breakage, only the failed linear member aggregate needs to be replaced. Thus, it is not necessary to discard the entire brush-like grinding stone. Consequently, the polishing cost can be reduced.

Abstract: A polishing tool unit (1) includes a brush-shaped grinding stone (4) and a tool holder (2). The tool holder (2) includes a shank (2a), a sleeve (6), a gear screw (30), and a nut (36). The nut (36) is screwed onto a bolt portion (34) of the gear screw (30). The brush-shaped grinding stone (4) is connected to the front side of the nut (36) and held by the tool holder (2). The gear screw (30) is rotatable relative to the shank (2a) and the sleeve (6) about the axis (L). While rotation of the nut (36) about the axis (L) is regulated, the gear screw (30) is rotated, whereby the nut (36) is moved and the protruding amount of linear grinding members (3) is adjusted.

Abstract: A polishing brush (4) includes a grinding element bundle (9) formed with a plurality of wire-shaped grinding elements (28) formed by impregnating and solidifying an assembly of inorganic filaments with resin, and a grinding element holder (7) having a holding hole (20) holding the base end portion of the grinding element bundle 9 on an outer peripheral side surface (7c) serving as a grinding element-holding surface. The grinding element bundle (9) has a front surface (9a) facing forward in a rotational direction (R1) and a back surface (9b) facing backward. The grinding element bundle (9) is held in the grinding element holder (7) such that the front surface (9a) and the back surface (9b) are inclined in the same direction relative to a virtual surface (30) that includes a center point (P) of a cross section (9d) of the grinding element bundle (9) cut across an outer peripheral side surface (7c) and the axis of center of rotation (L) of the grinding element holder (7) and extends in a radial direction.

Abstract: A rotating tool includes a tool body including a polishing tool and a shank, and a flange part provided in the tool body. The polishing tool includes a plurality of linear grinding members and a grinding member holder to hold the linear grinding members. The flange part is an annular member, and attached to the grinding member holder, so as to be movable in the direction of an axial line and rotatable about the axial line. When the inner circumferential surface of a hole formed in a workpiece is processed, the grinding member holder and the annular member are inserted into the hole. When run-out on the front side of the rotating tool occurs, the annular member comes into contact with the peripheral wall surface of the hole, whereby the run-out of the tool body is reduced.

Abstract: A polishing brush (1) includes a brush-shaped grindstone (12) holding grinding element bundles (11) of wire-shaped grinding elements (27) in an annular shape and a grinding element displacement-restricting member (13) for restricting displacement of the grinding element bundles (11) outward. The brush-shaped grindstone (12) has a grinding element holder (15) holding the base end portions (upper end portions) of the grinding element bundles (11). The grinding element displacement-restricting member (13) has an annular part (33) surrounding the wire-shaped grinding elements (27) from the outer peripheral side at a position between the tip ends of the wire-shaped grinding elements (27) and the grinding element holder (15) in the direction of the axis of center of rotation (L) and at a distance away from the tip ends of the wire-shaped grinding elements (27) and the grinding element holder (15).

Abstract: An object is to provide a working method capable of efficiently deburring and polishing a workpiece and making the life of a brush in use long in a machine tool not having power to directly rotate a tool and capable of working the workpiece by bringing the tool and the workpiece in contact with each other while causing the tool and the workpiece to perform a relative motion. The present invention relates to a working method of working a workpiece by rotating a brush-like grinding wheel by causing a brush-like grinding wheel and a workpiece to perform a relative motion while bringing the brush-like grinding wheel and the workpiece in contact with each other in a machine tool not having power to rotate a tool.

Abstract: A polishing brush (1) includes a plurality of linear abrasive members (32) each formed by hardening an aggregated yarn of inorganic filaments by a resin binder, and a holder (2) that holds the linear abrasive members (32). The linear abrasive members (32) are held by a base (31). The base (31) is secured to a spindle (25) in the holder (2). In the spindle (25), a flow path (28) for discharging a liquid cutting agent toward a side on which free ends (33) of the linear abrasive members (32) are located is provided.

Abstract: A brush-like grinding stone (3) in a polishing brush (1) includes a brush holder (6) and a linear member aggregate (7) detachably held in the brush holder (6). The linear member aggregate (7) includes a large number of bundles (51) of the linear members (50) obtained by hardening aggregated yarn of inorganic filaments impregnated with a resin, and a brush holder (70) holding ends of the bundles (51). A linear member holder (70) in the linear member aggregate (7) is detachably attached to each of a plurality of holding holes (68) that is open in one side in an axial line direction L. In a case where any of the linear member aggregates has a failure, such as breakage, only the failed linear member aggregate needs to be replaced. Thus, it is not necessary to discard the entire brush-like grinding stone. Consequently, the polishing cost can be reduced.

Abstract: For the purpose of producing an alumina composite in which the integrity between alumina and an inorganic material is further improved, a dispersion liquid preparation step, a solidification step and a burning step are performed, wherein the dispersion liquid preparation step comprises preparing a dispersion liquid in which an inorganic material such as a carbon material is homogeneously dispersed in an alumina raw material solution having an organic additive dissolved therein, the solidification step comprises drying the dispersion liquid to produce a solid raw material, and burning step comprises burning the solid raw material in a non-acidic atmosphere while contacting hydrogen chloride with the solid raw material. In this manner, an alumina composite can be produced, in which at least a portion of an inorganic material such as a carbon material is embedded in the inside of each of ?-alumina single crystal particles the constitute alumina particles.

Abstract: For the purpose of producing an alumina composite in which the integrity between alumina and an inorganic material is further improved, a dispersion liquid preparation step, a solidification step and a burning step are performed, wherein the dispersion liquid preparation step comprises preparing a dispersion liquid in which an inorganic material such as a carbon material is homogeneously dispersed in an alumina raw material solution having an organic additive dissolved therein, the solidification step comprises drying the dispersion liquid to produce a solid raw material, and burning step comprises burning the solid raw material in a non-acidic atmosphere while contacting hydrogen chloride with the solid raw material. In this manner, an alumina composite can be produced, in which at least a portion of an inorganic material such as a carbon material is embedded in the inside of each of ?-alumina single crystal particles the constitute alumina particles.

Abstract: In the manufacture of a brush-shaped grindstone (3), embedding holes (310) are formed in a grinding element holding surface (311) of a holder (31) in mutually separated positions. A base end side of a plurality of wire-shaped grinding elements (32), formed such that a composite yarn composed of inorganic filaments is impregnated and hardened with a resin, is aligned, and rod assemblies (320) are thereafter formed by fixing the base end side of the plurality of wire-shaped grinding elements (32) with adhesive (71) in holes (60) of a die material (6), which is formed to have substantially the same size as the embedding holes (310) of the holder (31). The rod assemblies (320) are thereafter embedded in the embedding holes (310) of the holder (32), and fixed with adhesive (72). Whereby, removing burrs from a precision work component, performing polishing, and the like can be carried out with good efficiency and high precision.