Physical presence of surface geometry errors and the surface layer roughness, waviness, etc., the mechanical properties change machined surface. In turning, the factors that affect the quality of the surface roughness of the main surface, work hardening, surface residual stress, wave and so on. Multi-edge tools can effectively improve the surface quality.

    Surface roughness

    Work hardening

    Surface residual stress

    Surface waviness

    Multi-edge turning tool can reduce the cutting depth of each cutting edge, thereby reducing the cutting force and the plastic deformation of the workpiece material, and therefore less surface roughness can be obtained. Further, since the cutting layer is thin, cold welding effect of the cutting edge with the metal material is small, can reduce built-up edge, Burr generation. Therefore, the use of multi-bladed tools can significantly improve the surface roughness.

    In machining, plastic deformation of the metal surface shear slip between crystal lattice distortion and the occurrence of elongated grains, broken and fibrosis, causing cold hardening of metallic materials. Work hardening can improve workpiece surface hardness and strength, lower toughness, become brittle, affecting the quality of the machined surface. As a result of multi-bladed tools can reduce the plastic deformation of the material, thus reducing the extent of work hardening. In addition, due to the multiple cutting edges are in close proximity, cutting heat difficult to distribute, allows the blade surface contact area with the workpiece temperature, partially offset by work hardening effect.