| 摘要 |
The invention relates to a multi-blade solid carbide drill for cutting high-strength sandwich materials. The tool comprises a shaft section and an adjoining cutting part, into which a number of chip flutes that corresponds to the number of main blades is incorporated. In order to reinforce the curvature of the resulting chip, the chip flute of the drill comprises a chip flute rib in the region of the chip formation zone, said rib protruding from the chip flute surface and having a substantially wave-shaped cross-section (28), and said rib dividing the chip flute into two sections, a first chip flute section (30) forming the cutting rake and a second chip flute (32) forming the chip flute runout. |
| 主权项 |
1. A solid carbide drill comprising:
a shaft section; an adjacent cutting part; and a drill bit, said cutting part comprising a core, a number of main cutting edges and a number of chip flutes, said number of chip flutes corresponding to said number of main cutting edges, at least a first chip flute of the drill comprising a chip flute base and a chip flute rib, said chip flute rib protruding out of the chip flute base in a chip formation zone of said drill, said chip flute rib having a substantially wave-shaped cross-section, said chip flute rib dividing the chip flute in the chip formation zone into a first chip flute section forming a cutting rake and a second chip flute section forming a chip flute runout, the first chip flute section comprising a cutting edge corner at a radial periphery of the first chip flute section, the first chip flute section extending from the cutting edge corner to the chip flute rib, the chip flute rib located beyond the core, the second chip flute section comprising at least one convex area, said chip formation zone and said chip flute rib terminating at a chip formation zone termination location, said chip flute terminating at a chip flute termination location, a distance between said drill bit and said chip formation zone termination location shorter than a distance between said drill bit and said chip flute termination location. |
