ニオブチタン合金の高能率加工に関する研究

抄録

Titanium alloys are widely used as implant materials because of their excellent corrosion resistance and strength, light weight, and high biocompatibility. The Young's modulus of titanium alloy is about 110 Gpa. Therefore, the bone strength around the insertion implant lowers and looseness are generated by the bone resorption by the stress shielding. Not only biocompatibility but also Young's modulus near the bone are necessary for the implant material. The niobium-titanium alloy is composed of Nb element and Ti element, and has characteristics of very low cytotoxicity and Young's modulus of about 60 GPa, which is relatively close to human bone. However, this alloy is difficult to cutting because of its low thermal conductivity and high weldability. In this study, the influence of difference cutting environments on tool life was investigated by milling of niobium-titanium alloy using round tool. It was clear that the MQL method can be extended the tool life by suppressing the generation of adhesion due to the lubrication effect of the oil mist. Moreover, it was clear also clear that the flank wear on the end cutting edge side rapidly progressed, and that the surface roughness increased.