| 摘要 |
<p>A rotary cutter (1) is disclosed which includes a cutter body (2) having an axis of rotation therethrough and a cutting insert (20) releasably secured to a forward end of the cutter body. The cutting insert (20) has marginal ridges defining a main cutting edge (22) and an auxiliary cutting edge (25). The main cutting edge (22) is directed radially outwardly of the cutter body while the auxiliary cutting edge (25) is directed axially forwardly of the cutter body. The cutting insert has faces defining a first rake surface (21) and a second rake surface (26,30). The first rake surface (21) is disposed adjacent to the main and auxiliary cutting edges such that an axial rake angle is no less than +30<o>. The second rake (26,30) surface is disposed between the first rake surface (21) and the auxiliary cutting edge (25) such that an angle, defined between the second rake surface (25) and the axis of rotation (O) of the body as viewed in a cross-section perpendicular to the auxiliary cutting edge (25), is no larger than +20<o>. The second rake surface (26,30) is formed such that a distance (L), measured in a direction parallel to the first rake surface (21) and defined between the auxiliary cutting edge (25) and the intersection of the first rake surface (21) with the second rake surface (26,30), is set so as to range from 0.5mm to 1.5mm. <IMAGE> <IMAGE></p> |
