The invention relates to an abrasive body (6) for a grinding tool with an abrasive layer (8), which has at least one binding agent (12) and abrasive grains (13), characterised in that thermochromic colouring agents are provided in the abrasive layer (8).

The invention relates further to a grinding tool (1) with an abrasive body (6) according to the invention and elements (5) for connecting the grinding tool (1) to a driving device for rotatingly driving the abrasive body (6).

The invention relates further to a use of the abrasive body (6) according to the invention or of the grinding tool (1) according to the invention for treating human body parts.

The invention relates to an abrasive body (6) for a grinding tool with an abrasive layer (8), which has at least one binding agent (12) and abrasive grains (13), characterised in that thermochromic colouring agents are provided in the abrasive layer (8).

The invention relates further to a grinding tool (1) with an abrasive body (6) according to the invention and elements (5) for connecting the grinding tool (1) to a driving device for rotatingly driving the abrasive body (6).

The invention relates further to a use of the abrasive body (6) according to the invention or of the grinding tool (1) according to the invention for treating human body parts.

An abrasive member includes an abrasive member base and a plurality of abrasive particles applied to the abrasive member base. At least a large proportion of the abrasive particles form an abrasive edge unit with an abrasive edge inclined at an angle between 0 and 90 relative to a defined working direction.

An abrasive member includes an abrasive member base and a plurality of abrasive particles applied to the abrasive member base. At least a large proportion of the abrasive particles form an abrasive edge unit with an abrasive edge inclined at an angle between 0 and 90 relative to a defined working direction.

The invention relates to an abrasive body for a grinding tool with an abrasive layer, which has at least one binding agent and abrasive grains, characterized in that thermochromic coloring agents are provided in the abrasive layer. The grinding tool includes elements for connecting the grinding tool to a driving device for rotatingly driving the abrasive body. The grinding tool is used for treating human body parts.

The invention relates to an abrasive body for a grinding tool with an abrasive layer, which has at least one binding agent and abrasive grains, characterized in that thermochromic coloring agents are provided in the abrasive layer. The grinding tool includes elements for connecting the grinding tool to a driving device for rotatingly driving the abrasive body. The grinding tool is used for treating human body parts.

A polishing tool includes a polishing surface having a spherical zone shape and having a plurality of non-contact portions provided from an inner edge to an outer edge of the polishing surface so as not to contact with a workpiece. The plurality of non-contact portions is a plurality of grooves whose widths in a circumferential direction increase from the inner edge toward the outer edge. A polishing method using the polishing tool includes: rotating the polishing tool about the central axis of rotation; and simultaneously with rotating the polishing tool, swinging relatively at least one of the workpiece and the polishing tool with a predetermined swing width, around a position where a line passing through a center of the workpiece and intersecting with the central axis of rotation passes through a center in a width direction of a spherical zone of the polishing surface, thereby polishing the workpiece.

A polishing tool includes a polishing surface having a spherical zone shape and having a plurality of non-contact portions provided from an inner edge to an outer edge of the polishing surface so as not to contact with a workpiece. The plurality of non-contact portions is a plurality of grooves whose widths in a circumferential direction increase from the inner edge toward the outer edge. A polishing method using the polishing tool includes: rotating the polishing tool about the central axis of rotation; and simultaneously with rotating the polishing tool, swinging relatively at least one of the workpiece and the polishing tool with a predetermined swing width, around a position where a line passing through a center of the workpiece and intersecting with the central axis of rotation passes through a center in a width direction of a spherical zone of the polishing surface, thereby polishing the workpiece.

An abrasive article includes a bonded abrasive body having abrasive particles comprising microcrystalline alumina (MCA) contained within a bond material. In an embodiment, the bonded abrasive body has a strength ratio (MOR/MOE) of at least about 0.80. Additionally, the bonded abrasive body may have a MOR of at least 40 MPa for a MOE or at least about 40 GPa and the bonded abrasive body may be capable of grinding a workpiece that includes metal at a speed of at least about 60 m/s at a material removal rate of at least about 0.4 in.sup.3/min/in (258 mm.sup.3/min/mm).

An abrasive article includes a bonded abrasive body having abrasive particles comprising microcrystalline alumina (MCA) contained within a bond material. In an embodiment, the bonded abrasive body has a strength ratio (MOR/MOE) of at least about 0.80. Additionally, the bonded abrasive body may have a MOR of at least 40 MPa for a MOE or at least about 40 GPa and the bonded abrasive body may be capable of grinding a workpiece that includes metal at a speed of at least about 60 m/s at a material removal rate of at least about 0.4 in.sup.3/min/in (258 mm.sup.3/min/mm).