Abstract: An annular retaining groove is formed on the inner circumferential portion of the disk-shaped rotating tool, and a ringlike cushioning member is fitted in this annular retaining groove so as to be partially exposed. Both sides of the inner circumferential portion of the disk-shaped rotating tool are held by first and second holding members through the annular cushioning member. An axial portion of the first holding member is engaged with an output shaft of an electric rotary machine so that the disk-shaped rotating tool is rotated through the first holding member by the output shaft.

Abstract: A metal bonded drilling and boring tool which can prevent the separation of abrasive grains during drilling and boring to maintain a stable working performance for a long period of time without the need for tool exchange. The tool includes a rod-shaped body having a substantially semispherical front end portion and numerous abrasive grains bonded to an outer circumferential surface of the rod-shaped body at the front end portion and at a portion having a given length from the front end portion by a bond member formed primarily of copper alloy. The bond member contains a material selected from the group consisting of Ti, Al, and a mixture thereof. The copper alloy is selected from the group consisting of bronze containing 10 to 33 wt % of Sn, brass containing 5 to 20 wt % of Zn, and aluminum bronze containing 5 to 20 wt % of Al.

Abstract: A metal-bonded grinding tool including a base and abrasive grains bonded to the base by means of a metal bond matrix containing a Cu alloy as a main component. A content of at least one of an alloy phase, a mixed phase, and an intermetallic compound of Zr and Ti in the metal bond matrix is in a range of 3.8 to 19.2 wt %.

Abstract: A metal bonded drilling and boring tool which can prevent the separation of abrasive grains during drilling and boring to maintain a stable working performance for a long period of time without the need for tool exchange. The tool includes a rod-shaped body having a substantially semispherical front end portion and numerous abrasive grains bonded to an outer circumferential surface of the rod-shaped body at the front end portion and at a portion having a given length from the front end portion by a bond member formed primarily of copper alloy. The bond member contains a material selected from the group consisting of Ti, Al, and a mixture thereof. The copper alloy is selected from the group consisting of bronze containing 10 to 33 wt % of Sn, brass containing 5 to 20 wt % of Zn, and aluminum bronze containing 5 to 20 wt % of Al.

Abstract: A metal bonded drilling and boring tool which can prevent the separation of abrasive grains during drilling and boring to maintain a stable working performance for a long period of time without the need for tool exchange. The tool includes a rod-shaped body having a substantially semispherical front end portion and numerous abrasive grains bonded to an outer circumferential surface of the rod-shaped body at the front end portion and at a portion having a given length from the front end portion by a bond member formed primarily of copper alloy. The bond member contains a material selected from the group consisting of Ti, Al, and a mixture thereof. The copper alloy is selected from the group consisting of bronze containing 10 to 33 wt % of Sn, brass containing 5 to 20 wt % of Zn, and aluminum bronze containing 5 to 20 wt % of Al.

Abstract: A metal-bonded grinding tool including a base and abrasive grains bonded to the base by means of a metal bond matrix containing a Cu alloy as a main component. A content of at least one of an alloy phase, a mixed phase, and an intermetallic compound of Zr and Ti in the metal bond matrix is in a range of 3.8 to 19.2 wt %.

Abstract: A metal-bonded grinding tool including a base, and abrasive grains bonded to the base by a bond matrix containing Cu alloy as a main component. The bond matrix further contains a powder selected from the group consisting of Ti, Al, and a mixture thereof. An average grain protrusion is set to 30% or more of an average grain diameter, and an average grain spacing is set to 200% or more of the average grain diameter.

Abstract: A cutting apparatus includes a first annular member having a center eccentric from an axis of a rotating shaft and fixed to the rotating shaft. The cutting apparatus further includes a bearing with its inner race fixed to the first annular member, a disk cutter fixed relative to an outer race of the bearing, and a balancer fixed to the rotating shaft in a state being eccentric in the direction opposite to the eccentric direction of the first annular member.

Abstract: A metal bonded drilling and boring tool which can prevent the separation of abrasive grains during drilling and boring to maintain a stable working performance for a long period of time without the need for tool exchange. The tool includes a rod-shaped body having a substantially semispherical front end portion and numerous abrasive grains bonded to an outer circumferential surface of the rod-shaped body at the front end portion and at a portion having a given length from the front end portion by a bond member formed primarily of copper alloy. The bond member contains a material selected from the group consisting of Ti, Al, and a mixture thereof. The copper alloy is selected from the group consisting of bronze containing 10 to 33 wt % of Sn, brass containing 5 to 20 wt % of Zn, and aluminum bronze containing 5 to 20 wt % of Al.

Abstract: A cutting apparatus includes a first annular member having a center eccentric from an axis of a rotating shaft and fixed to the rotating shaft. The cutting apparatus further includes a bearing with its inner race fixed to the first annular member, a disk cutter fixed relative to an outer race of the bearing, and a balancer fixed to the rotating shaft in a state being eccentric in the direction opposite to the eccentric direction of the first annular member.