Abstract: A holder has a square column shape extending from a first end toward a second end. The holder includes a pocket located on a side of the first end, and a first side surface and a second side surface each extending from the first end toward the second end. The second side surface includes a first region that is flat and that is located on the side of the first end, a second region that is flat and that is located closer to the second end than the first region and closer to the first side surface than the first region, and a step connecting the first region and the second region. The step has a convex curve shape toward the second end in a cross section parallel to the first region.

Abstract: A cutting tool may include a holder extended along a central axis from a first end to a second end and including a pocket, and a cutting insert located in the pocket. The holder may further include an upper surface, a lower surface, a first end surface, a first side surface, a recess, a first flow path and a second flow path. The recess opens into the first end surface and the first side surface. The first flow path is located along the central axis. The second flow path is located closer to the upper surface than the recess and connects to the first flow path. An imaginary plane that passes through the central axis and is orthogonal to the lower surface is a reference plane. The pocket opens into the recess and is recessed from the recess toward the reference plane.

Abstract: A cutting tool may include a flow path and a sealing part. The flow path may include an inflow port and an outflow port. The sealing part may be located continuously with the flow path and may include a male screw and a female screw. Screw threads in the male screw may include a first screw thread. Screw grooves in the female screw may include a first screw groove. A top portion of the first screw thread may be in contact with a bottom portion of the first screw groove.

Abstract: A cutting tool may include a holder and a cutting insert. The cutting insert may include a ridge including a corner and a first side. The holder may include a first flow path extending along a first central axis, and a second flow path extending along a second central axis. A line obtained by extending the first central axis may be a first imaginary line, and a line obtained by extending the second central axis may be a second imaginary line, each of the first imaginary line and the second imaginary line is inclined downward. An intersection of the first imaginary line and the second imaginary line is located outside of the cutting insert in a plan view. The first imaginary line intersects with the ridge and the second imaginary line intersects with the first side at a side closer to the second end than the first imaginary line.

Abstract: A cutting tool may include a holder extended along a central axis from a first end to a second end and including a pocket, and a cutting insert located in the pocket. The holder may further include an upper surface, a lower surface, a first end surface, a first side surface, a recess, a first flow path and a second flow path. The recess opens into the first end surface and the first side surface. The first flow path is located along the central axis. The second flow path is located closer to the upper surface than the recess and connects to the first flow path. An imaginary plane that passes through the central axis and is orthogonal to the lower surface is a reference plane. The pocket opens into the recess and is recessed from the recess toward the reference plane.

Abstract: A holder for a cutting tool of the present disclosure extends from a first end toward a second end, and includes an inflow port, an outflow port located at a side of the first end, and a flow path extending from the inflow port toward the outflow port. The outflow port includes a first opening and a second opening. The flow path includes a first flow path extending continuously from the inflow port, a second flow path extending continuously from the first flow path through a first branch port to the first opening, and a third flow path extending continuously from the first flow path through a second branch port to the second opening. The first branch port is larger than the second branch port. An outflow through the first opening is greater than an outflow through the second opening.

Abstract: A cutting tool may include a holder and a cutting insert. The cutting insert may include a ridge including a corner and a first side. The holder may include a first flow path extending along a first central axis, and a second flow path extending along a second central axis. A line obtained by extending the first central axis may be a first imaginary line, and a line obtained by extending the second central axis may be a second imaginary line, each of the first imaginary line and the second imaginary line is inclined downward. An intersection of the first imaginary line and the second imaginary line is located outside of the cutting insert in a plan view. The first imaginary line intersects with the ridge and the second imaginary line intersects with the first side at a side closer to the second end than the first imaginary line.

Abstract: In an embodiment, a cutting tool is disclosed. The cutting tool includes a holder and an insert. The holder has a shape extending from a first end to a second end, and includes a flow path and a pocket located at a side of the first end. The insert is located at the pocket. The flow path includes a first flow path and a second flow path. The first flow path includes a first opening located at a side of the first end and located above the insert. The second flow path includes a second opening located at a side of the first end and located above the first opening. A first imaginary line of the first flow path and a second imaginary line of the second flow path intersect each other above the insert. A method of manufacturing a machine product by using the cutting tool is also disclosed.

Abstract: A cutting tool may include a flow path and a sealing part. The flow path may include an inflow port and an outflow port. The sealing part may be located continuously with the flow path and may include a male screw and a female screw. Screw threads in the male screw may include a first screw thread. Screw grooves in the female screw may include a first screw groove. A top portion of the first screw thread may be in contact with a bottom portion of the first screw groove.

Abstract: A holder for a cutting tool of the present disclosure extends from a first end toward a second end, and includes an inflow port, an outflow port located at a side of the first end, and a flow path extending from the inflow port toward the outflow port. The outflow port includes a first opening and a second opening. The flow path includes a first flow path extending continuously from the inflow port, a second flow path extending continuously from the first flow path through a first branch port to the first opening, and a third flow path extending continuously from the first flow path through a second branch port to the second opening. The first branch port is larger than the second branch port. An outflow through the first opening is greater than an outflow through the second opening.

Abstract: In an embodiment, a cutting tool is disclosed. The cutting tool includes a holder and an insert. The holder has a shape extending from a first end to a second end, and includes a flow path and a pocket located at a side of the first end. The insert is located at the pocket. The flow path includes a first flow path and a second flow path. The first flow path includes a first opening located at a side of the first end and located above the insert. The second flow path includes a second opening located at a side of the first end and located above the first opening. A first imaginary line of the first flow path and a second imaginary line of the second flow path intersect each other above the insert. A method of manufacturing a machine product by using the cutting tool is also disclosed.

Abstract: The cutting insert is provided with: a top surface, a bottom surface, a side surface, a cutting edge located at the intersection portion of the top surface and the side surface; a through hole located from the top surface to the bottom surface; a projecting portion extending from a corner section to a through hole side; and a rake surface located between the cutting edge and the projecting portion. A boundary line between the rake surface and the projecting portion comprises a first end. In a top view, a bisector of the corner section intersects the cutting edge at a first point and intersects a top edge section of the through-hole at a second point. The first end is located closer to the through-hole side than a perpendicular line that passes through a midpoint of a line segment connecting the first point and the second point.

Abstract: A cutting tool including an insert and a holder to which the insert is secured. The insert has a rod with a substantially circular transverse cross-section. The insert includes a shank portion and a cutting edge portion. The cutting edge portion is located at an end portion continuous with the shank portion. In the cutting edge portion, one end of a cutting edge ridge protrudes toward the periphery of the rod. When the insert is secured to the holder, the cutting edge ridge has a negative radial rake angle.

Abstract: A holder and a cutting tool with the holder including an insertion hole at a front end part thereof, and a cutting insert that includes a cutting edge part and a shank part. The shank part has substantially a rod shape. A part of the shank part is immovably located in the insertion hole. The front end part of the holder includes a first curved surface part that becomes wider from a front end toward a back side when viewed from a side thereof. The first curved surface part includes: a curved line that extends from an edge of an opening of the insertion hole toward the back side; or a straight line that extends from the edge of the opening of the insertion hole and connects to a curved line that extends continuously from the straight line toward the back side without an angular part.

Abstract: Provided is a cutting insert (1) exhibiting excellent chip dischargeability under a wide range of cutting conditions, and also being capable of reducing cutting resistance and increasing wear resistance. The cutting insert is provided with: a polygonal top surface (2), a bottom surface (3), a side surface (4), a cutting edge (6) located at the intersection portion of the top surface (2) and the side surface (4), and provided to at least a corner section (5) of the top surface; a through-hole (7) provided from a center portion of the top surface to a center portion of the bottom surface; a projecting portion (9) extending from a corner section (5) to a through-hole (7) side; and a rake surface (8) extending from the corner section (5) between the cutting edge (6) and the projecting portion (9) to the through-hole (7) side.

Abstract: A holder and a cutting tool with the holder including an insertion hole at a front end part thereof, and a cutting insert that includes a cutting edge part and a shank part. The shank part has substantially a rod shape. A part of the shank part is immovably located in the insertion hole. The front end part of the holder includes a first curved surface part that becomes wider from a front end toward a back side when viewed from a side thereof. The first curved surface part includes: a curved line that extends from an edge of an opening of the insertion hole toward the back side; or a straight line that extends from the edge of the opening of the insertion hole and connects to a curved line that extends continuously from the straight line toward the back side without an angular part.

Abstract: A cutting tool including an insert and a holder to which the insert is secured. The insert has a rod with a substantially circular transverse cross-section. The insert includes a shank portion and a cutting edge portion. The cutting edge portion is located at an end portion continuous with the shank portion. In the cutting edge portion, one end of a cutting edge ridge protrudes toward the periphery of the rod. When the insert is secured to the holder, the cutting edge ridge has a negative radial rake angle.

Abstract: Provided is an insert that has good positioning precision and sufficient rigidity. Said insert is rod-shaped and has: a shank part; cutting blades formed on both sides of the shank part; and raised surfaces that are positioned between the cutting blades and the shank part and bulge such that parts farther away from the cutting blades are progressively closer to the outer surface of the shank part. In a side view, the rake face of the cutting blade on one side and the raised surface on the other side are disposed in the same direction with respect to the axis of rotation of the shank part.

Abstract: A cutting tool of the invention is equipped with a cutting insert comprising an upper surface, a lower surface, a side surface connected to the upper surface and the lower surface, and an upper surface side cutting edge and a lower surface side cutting edge formed at an intersection portion between the upper surface and the side surface and at an intersection portion between the lower surface and the side surface, respectively; and a holder comprising at a front part thereof an insert pocket to which the cutting insert is attached. The insert pocket comprises a bearing seat surface against which the lower surface of the cutting insert abuts, and is opened into a front surface and a side surface of the holder, respectively.

Abstract: In a cutting insert of the invention, a protruded portion formed on an upper surface lying more inward than a breaker groove along a corner comprises a breaker projection adjacentmost to the corner; a breaker wall face formed connectedly with the breaker projection so as to project more upward than the breaker projection; and a breaker side face formed connectedly with the breaker wall face. The breaker wall face is formed to have a smaller width toward the projecting direction of the breaker wall face, and inclined to have a higher position as it departs from the corner. The breaker side face is formed to have a larger width as it departs from the corner. The height of the breaker projection is not more than half of the height of the top of the breaker wall face, and is lower than the height of the cutting edge along the corner. A cutting method using a cutting tool comprising the cutting insert is also provided.