| 摘要 |
PURPOSE: To improve roughness of the finish face of material to be cut and discharging disposal of chip. CONSTITUTION: The nose 9 of a throw away tip is formed out of a pair of subcutting blades 10a, 10b line symmetric against the bisector L of a pinch angle. The first cutting edge 12 of the subcutting blade 10a is formed into a circular arc, and when an intersection angle between a side 8 and the chord (k) of the first cutting edge 12 is set asθand the length of the chord (k) as A, the radius R1 of the first cutting edge is obtained by R1 = (Atanθ)<2> +A<2> }/(2 Atanθ) or R1 =((Asinθ)<2> +A<2> }/(2Asinθ). A second cutting edge 13 continued to the first cutting edge 12 is formed into a circular arc of relative small diameter making the extension line of the chord (k) of the first cutting edge 12 as the tangent, and smoothly continued to it. A cutting edge 11 of small circular arc connects together a pair of the subcutting blades 10a, 10b between.
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