Abstract: A boring tool can form a hole accurately by improving the rigidity of a reamer so that the runout of the reamer can be prevented at high speeds, extending product life by suppressing the breakage caused by cutting resistance. The boring tool is inserted into a pilot hole formed in a workpiece beforehand to cut the inner wall of the pilot hole. The boring tool comprises a shank part rotated about an axis, an edge part with a cutting edge at the tip of the shank part, and a chip discharging groove formed in the outer peripheral part of the edge part and extending from the tip to the rear end. The cutting edge is formed at a crossed ridge part between the wall surface of the chip discharging groove and the outer peripheral surface of the edge part. The cross-section of the chip discharging groove is formed in a U-shape.

Abstract: A sputtering apparatus includes a rotatable rotary member to which a target is attached, connection terminals, and feeding terminals. The connection terminals are arranged on the end portion of the rotary member in a direction along the axis of rotation of the rotary member, and are electrically connected to the target. The feeding terminals supply electric power to the target via the connection terminals. When the rotary member is rotated while the feeding terminals are in contact with the end portion of the rotary member, the electrical connection or insulation state between the feeding terminals and connection terminals is switched.

Abstract: A boring tool capable of accurately forming a bored hole by securing the rigidity of a reamer to prevent turn out of the reamer at high speeds and enabling an increase in life by suppressing the breakage thereof by cutting resistance. The boring tool (21) is inserted into a pilot hole formed in a workpiece beforehand to cut the inner wall surface of the pilot hole. The boring tool comprises a shank part rotated about an axis (O), an edge part with a cutting edge (30) at the tip of the shank part, and a chip discharging groove (27) formed in the outer peripheral part of the edge part and extending from the tip side to the rear end side. The cutting edge (30) is formed at a crossed ridge part between the wall surface (28) of the chip discharging groove (27) facing forward in the tool rotating direction (T) and the outer peripheral surface (29) of the edge part. The boring tool is characterized in that the cross-section of the chip discharging groove (27) vertical to the axis (O) is formed in a U-shape.

Abstract: The present invention provides a drill comprising: a drill main body rotatable about an axis of rotation, and having a tip end with a tip flank and a shank; a chip discharge flute formed on a periphery of the drill main body, and extending from the tip end toward the shank of the drill main body; and a cutting edge formed along an intersecting ridge where a wall surface of the chip discharge flute facing in the direction of drill rotation intersects the tip flank of the drill main body, wherein the cutting edge comprises a convex cutting edge toward the periphery and a concave cutting edge smoothly extending from the convex cutting edge.