Ohkubo C, Watanabe I, Ford J P, Nakajima H, Hosoi T, Okabe T
Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, Yokohama, Japan.
Biomaterials. 2000 Feb;21(4):421-8. doi: 10.1016/s0142-9612(99)00206-9.
This study investigated the machinability (ease of metal removal) of commercially pure (CP) titanium and Ti-6Al-4V alloy. Both CP Ti and Ti-6Al-4V were cast into magnesia molds. Two types of specimens (with alpha-case and without alpha-case) were made for CP Ti and Ti-6Al-4V. Machinability (n = 5) was evaluated as volume loss (mm3) by cutting/grinding the 3.0 mm surface using fissure burs and silicon carbide (SiC) under two machining conditions: (1) two machining forces (100 or 300 gf) at two rotational speeds (15000 or 30000 rpm) for 1 min, and (2) constant machining force of 100 gf and rotational speed of 15000 rpm for 1, 2, 5, 10, and 30 min. As controls, conventionally cast Co-Cr and Type IV gold alloys were evaluated in the same manner as the titanium. When fissure burs were used, there was a significant difference in the machinability between CP titanium with alpha-case and without alpha-case. On the other hand, there was no appreciable difference in the amount of metal removed for each tested metal when using the SiC points.
本研究调查了工业纯钛（CP钛）和Ti-6Al-4V合金的可加工性（金属去除的难易程度）。CP钛和Ti-6Al-4V均铸入氧化镁模具中。针对CP钛和Ti-6Al-4V制作了两种类型的试样（有α层和无α层）。通过在两种加工条件下使用裂钻和碳化硅（SiC）切割/磨削3.0毫米表面，将可加工性（n = 5）评估为体积损失（mm³）：（1）在两种转速（15000或30000转/分钟）下施加两种加工力（100或300克力）持续1分钟，以及（2）施加100克力的恒定加工力和15000转/分钟的转速持续1、2、5、10和30分钟。作为对照，按照与钛相同的方式对传统铸造的钴铬合金和IV型金合金进行评估。当使用裂钻时，有α层和无α层的CP钛在可加工性上存在显著差异。另一方面，使用SiC磨头时，每种测试金属的金属去除量没有明显差异。
