| 摘要 |
<p>A deep-grooving chip-forming cutting insert (20) includes a rear mounting portion, a front cutting portion, and a pair of side walls, each side wall extending along the front and rear portions. The front cutting portion includes a front end surface, a top surface, and a cutting edge disposed at a transition between the front end surface and the top surface and extending from one side wall to the other to define a cutting width. The cutting edge includes a main portion, a pair of convexly curved first corner portions (40) disposed at respective ends of the main portion, and a pair of convexly curved second corner portions (42) offset rearwardly and outwardly with respect to respective first corner portions, wherein a step (44) is formed between each first corner portion and its respective second corner portion. The main portion has a length as viewed in a direction perpendicular to the top surface, and which is at least 80% of the cutting width.</p> |
