Patent ID: 11911828
Assignee: KYOCERA CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A cutting insert, comprising:
a first surface;
a second surface located on a side opposite to the first surface;
a third surface located between the first surface and the second surface;
a cutting edge located on an intersection of the first surface and the third surface;
a central axis passing through a center of the first surface and a center of the second surface; and
an imaginary plane that is located between the first surface and the second surface and is orthogonal to the central axis, wherein
the first surface comprises
a corner,
a first side extended from the corner,
a first inclined surface that is inclined downwardly at a first inclination angle as going away from the corner,
a second inclined surface that is located further inside the first surface than the first inclined surface and is inclined downwardly,
a third inclined surface that is inclined downwardly at a third inclination angle as going away from the first side,
a fourth inclined surface that is located further inside the first surface than the third inclined surface and is inclined downwardly, and
a protruded part which is located further inside the first surface than the second inclined surface and the fourth inclined surface, which comprises
a fifth inclined surface inclined upwardly at a fifth inclination angle as going away from the corner, and the fifth inclined surface is directly connected to the second inclined surface, and
a sixth inclined surface inclined upwardly at a sixth inclination angle, and

the sixth inclined surface is directly connected to the fourth inclined surface,

the second inclination angle is larger than the first inclination angle,
the fourth inclination angle is larger than the third inclination angle,
the fifth inclination angle is smaller than the second inclination angle in a cross section that is orthogonal to the imaginary plane and along a bisector of the corner,
the sixth inclination angle is larger than the third inclination angle in a cross section orthogonal to the first side,
the fifth inclination angle is smaller than the first inclination angle in the cross section that is orthogonal to the imaginary plane and along the bisector, and
the sixth inclination angle is larger than the fourth inclination angle in the cross section orthogonal to the first side.