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CUTTING INSERT, TOOL BODY ON WHICH SAID CUTTING INSERT CAN BE MOUNTED, AND EXCHANGEABLE EDGE CUTTING TOOL AND BALL END MILL PROVIDED WITH SAME
CUTTING INSERT, TOOL BODY ON WHICH SAID CUTTING INSERT CAN BE MOUNTED, AND EXCHANGEABLE EDGE CUTTING TOOL AND BALL END MILL PROVIDED WITH SAME
In a cutting insert which has a top surface, a bottom surface and a side surface connecting them, in which a part of an intersecting ridge between the top surface and the side surface functions as a cutting edge, and in which in the side surface, a side surface portion adjacent to the intersecting ridge portion opposing the cutting edge intersects the top surface at an acute angle, a structure in which shifting hardly occurs even by cutting resistance applied to the cutting edge is provided. At least on a part of a bottom surface (3), an inclined surface (12) gradually approaching the top surface (2) with increasing distance from a side surface portion (4b) on a side opposite to a cutting edge (8) is formed. Since the cutting resistance applied to the cutting edge (8) is resolved into a force perpendicular to the inclined surface (12) and a force parallel thereto, a part of the cutting resistance acts on the side surface portion (4b). As a result, friction resistance between the side surface portion (4b) and the side surface (24) of an insert seat (22) becomes larger.
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