The purpose of the present invention is to provide a drum-type shot peening device capable of shortening processing time. This shot peening device comprises: a bottomed, cylindrical drum having one end thereof open; and a projector provided on the open side of the drum and which projects projection material on to a workpiece inserted inside the drum. The projector comprises: a cylindrical control gauge having an opening window that is formed in the side wall thereof and serves as a discharge port for the projection material, said opening window having a rectangular shape having two sides thereof parallel to the center axis of the control gauge having the projection material supplied therein; and an impeller comprising a plurality of blades arranged on the outside of the control gauge so as to extend in the radial outside direction of the control gauge, said impeller rotating around the center axis of the control gauge and having a backward-tilting section that is tilted towards the rear side in the blade rotation direction and is provided on the surface on the front side in the rotation direction.

The purpose of the present invention is to provide a drum-type shot peening device capable of shortening processing time. This shot peening device comprises: a bottomed, cylindrical drum having one end thereof open; and a projector provided on the open side of the drum and which projects projection material on to a workpiece inserted inside the drum. The projector comprises: a cylindrical control gauge having an opening window that is formed in the side wall thereof and serves as a discharge port for the projection material, said opening window having a rectangular shape having two sides thereof parallel to the center axis of the control gauge having the projection material supplied therein; and an impeller comprising a plurality of blades arranged on the outside of the control gauge so as to extend in the radial outside direction of the control gauge, said impeller rotating around the center axis of the control gauge and having a backward-tilting section that is tilted towards the rear side in the blade rotation direction and is provided on the surface on the front side in the rotation direction.

Apparatus 10 and method for cleaning, rejuvenating or treating the internal surfaces of a timber barrel 28 with an abrasive, the apparatus 10 comprising a clamping arrangement that includes at least one clamp 21-24 for clamping the barrel 28. The clamp 21-24 being rotatable to rotate the barrel 28 about its axis and the clamping arrangement being operable to tilt the axis of the barrel 28 during rotation through at least about 20°, preferably 25-40%, to either side of horizontal.

Apparatus 10 and method for cleaning, rejuvenating or treating the internal surfaces of a timber barrel 28 with an abrasive, the apparatus 10 comprising a clamping arrangement that includes at least one clamp 21-24 for clamping the barrel 28. The clamp 21-24 being rotatable to rotate the barrel 28 about its axis and the clamping arrangement being operable to tilt the axis of the barrel 28 during rotation through at least about 20°, preferably 25-40%, to either side of horizontal.

A method, performed by a centrifuge, for treating toughness and hardness of drill bit buttons is provided. The centrifuge comprises a chamber formed by a stationary side wall and a bottom which is rotatable around a rotation axis, the bottom comprising one or more protrusions which at least partly extends between the rotation axis and the side wall, the side wall comprising at least six pushing elements arranged around a periphery of the side wall. The method comprises rotating, by rotation of the bottom with the protrusions, the drill bit buttons around the rotation axis, pushing, by the pushing elements, the drill bit buttons from the side wall during the rotation of the bottom, collectively forming the drill bit buttons into a torus shape at the bottom of the chamber for inducing collisions between the drill bit buttons, thereby treating the toughness and hardness of the drill bit.

A method, performed by a centrifuge, for treating toughness and hardness of drill bit buttons is provided. The centrifuge comprises a chamber formed by a stationary side wall and a bottom which is rotatable around a rotation axis, the bottom comprising one or more protrusions which at least partly extends between the rotation axis and the side wall, the side wall comprising at least six pushing elements arranged around a periphery of the side wall. The method comprises rotating, by rotation of the bottom with the protrusions, the drill bit buttons around the rotation axis, pushing, by the pushing elements, the drill bit buttons from the side wall during the rotation of the bottom, collectively forming the drill bit buttons into a torus shape at the bottom of the chamber for inducing collisions between the drill bit buttons, thereby treating the toughness and hardness of the drill bit.

A barrel polishing apparatus has a barrel tank. The barrel tank includes a cylindrical fixed tank having a center axis and a rotary disk provided to cover a bottom portion of the fixed tank and rotatable about the center axis. The barrel polishing apparatus further includes a tilting mechanism. The tilting mechanism has a tilting shaft extending in a horizontal direction to tilt the barrel tank around the tilting shaft. The tilting shaft is disposed closer to the upper edge of the fixed tank than a centroidal line extending parallel to the tilting shaft and passing through the center of gravity of the barrel tank when viewed from a direction parallel to an extending direction of the tilting shaft.

A barrel polishing apparatus has a barrel tank. The barrel tank includes a cylindrical fixed tank having a center axis and a rotary disk provided to cover a bottom portion of the fixed tank and rotatable about the center axis. The barrel polishing apparatus further includes a tilting mechanism. The tilting mechanism has a tilting shaft extending in a horizontal direction to tilt the barrel tank around the tilting shaft. The tilting shaft is disposed closer to the upper edge of the fixed tank than a centroidal line extending parallel to the tilting shaft and passing through the center of gravity of the barrel tank when viewed from a direction parallel to an extending direction of the tilting shaft.

A method, performed by a centrifuge, for treating toughness and hardness of drill bit buttons is provided. The centrifuge comprises a chamber formed by a stationary side wall and a bottom which is rotatable around a rotation axis, the bottom comprising one or more protrusions which at least partly extends between the rotation axis and the side wall, the side wall comprising at least six pushing elements arranged around a periphery of the side wall. The method comprises rotating, by rotation of the bottom with the protrusions, the drill bit buttons around the rotation axis, pushing, by the pushing elements, the drill bit buttons from the side wall during the rotation of the bottom, collectively forming the drill bit buttons into a torus shape at the bottom of the chamber for inducing collisions between the drill bit buttons, thereby treating the toughness and hardness of the drill bit.

A method, performed by a centrifuge, for treating toughness and hardness of drill bit buttons is provided. The centrifuge comprises a chamber formed by a stationary side wall and a bottom which is rotatable around a rotation axis, the bottom comprising one or more protrusions which at least partly extends between the rotation axis and the side wall, the side wall comprising at least six pushing elements arranged around a periphery of the side wall. The method comprises rotating, by rotation of the bottom with the protrusions, the drill bit buttons around the rotation axis, pushing, by the pushing elements, the drill bit buttons from the side wall during the rotation of the bottom, collectively forming the drill bit buttons into a torus shape at the bottom of the chamber for inducing collisions between the drill bit buttons, thereby treating the toughness and hardness of the drill bit.