| 摘要 |
According to the invention there is provided a solid ball nose tool consisting of a hard material with 30-70 volume% submicron hard constituents in the form of carbides, nitrides and/or carbonitrides of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and/or W in a metallic matrix based on Fe, Co and/or Ni. The tool has been designed such that it has a constant positive rake angle (3) along the whole end radius (4) of +8+/-2 DEG and a continuously decreasing clearance angle (1) and (5) towards the centre where it is 10+/-2 DEG . <IMAGE> |
