| 摘要 |
The base plate (2) has preliminary surfaces (4,6) on the upper side and between which is at least one row of blades (10) positioned crosswise to the cutting direction (A). The blades' cutting edges (16) protrude above the preliminary surfaces and are open on the underside of the base plate. The at least one row of blades forms top transverse arms (12) each with a central recess (20). The blades of the top transverse arms have at least one V-shaped groove (22) or at least two grooves (28) defining a space in-between them (30) and positioned in the middle in front of the recess. |
