A study on micro machining for super elasto-plastic titanium alloy with small ball end mill tool:Influence of cutting temperature and cutting force on affected layer

摘要

In this study, the influence of the cutting temperature and cutting force on the Young's modulus of the affected surface layer of a P-type super elasto-plastic titanium alloy workpiece was investigated by milling using a small ball end mill. The obtained results are summarized as follows. (1) The thickness of the affected layer tended to increase with increasing cutting speed and was approximately 0.5 μm at a cutting speed of 4.0 m/s. (2) As the cutting speed increased, the cutting temperature increased, and the cutting force decreased. (3) The thickness of the affected layer exceeded 2.5 μm at a cutting speed of 16 m/s. The factor causing the extreme increase was the cutting temperature approaching the transformation point of this workpiece. (4) The formation of the affected layer can be more effectively controlled by varying the cutting temperature more than the cutting force.