1. General

1.1 Towards high-speed machining

• Let's carry out a first experiment: let's turn a medium-hard steel log with a CNMG 120408 type tool, the geometry is semi-finished, and the cutting material is coated carbide. The depth of cut is 2.5 mm and the feed rate 0.3 mm · tr ^-1 ; let's vary the cutting speed from a very low value, say 5 m · min ^-1 . What do we observe?

  • At very low speeds, the tool does not cut or cuts under very poor conditions; the chips are poorly formed, the surface produced is rough and irregular, and the tool is loaded with an adherent chip that causes rapid tool wear (adhesive wear).