Cutting insert and cutting tool and cutting method employing it
A technology for cutting inserts and cutting tools, which is applied in the direction of milling cutting blades, manufacturing tools, accessories of tool holders, etc. It can solve the problems of cutting edge defects and cracks easily, and achieve the effect of suppressing defects and superior machining accuracy
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[0022]
[0023] Below, refer to Figure 1 ~ Figure 4 An embodiment of the cutting insert of the present invention (hereinafter referred to as an insert) will be described in detail. Such as figure 1 As shown, the insert 1 of this embodiment has a body portion 7, wherein the body portion 7 has: a substantially polygonal upper surface; a lower surface 8; and a side surface. The main body 7 has a rake surface 2 formed on at least a part of the upper surface; a flank surface 3 formed on at least a part of the side surface; and a cutting edge 4 formed at the intersection of the rake surface 2 and the flank surface 3.
[0024] The cutting edge 4 has: a first cutting edge 41; a second cutting edge 42; and a third cutting edge 43. The third cutting edge 43 is located between the first cutting edge 41 and the second cutting edge 42 and is located at a substantially polygonal corner in a plan view. The first cutting edge 41 functions as a main cutting edge. The second cutting edge 42 f...
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