Study on forming processing of the artificial joint using a vanadium free beta type titanium alloy

虽然作为人工髋关节柄的外科植入物在几个规格中被标准化，但它们在尺寸和形式上的变化不足以适合每个患者。因此，为了使它们适合于任何患者，需要这些植入物可以通过应用通过MRI或X射线CT获得的患者的医学图像数据通过机械加工来快速制造。此外，为了消除钒对人体的毒性作用，不含钒的钛合金最近将代替传统类型的钛合金如Ti-6A 1 -4V系统应用于外科植入物材料。2002年，这些材料在日本工业标准中被标准化为外科植入物用钛合金。另一方面，在切削包括上述无钒合金在内的钛合金的过程中，切削刃的温度升高是显著的，它强烈地促进了刀具与工件之间的粘附 ...更多信息 一般来说，在相对较短的持续时间内导致工具失效。因此，为了提高钛合金切削加工效率，提出了一种无粘结剂立方氮化硼刀具用于钛合金切削。结果表明，无粘结剂cBN刀具具有较低的后刀面磨损，并保持锋利的切削刃。在本研究中，通过累积使用3D-CT设备拍摄的关于患者患部形状的图片，能够创建适合于患部的三维形状的抓取和患部形状的植物形状的CAD数据。利用CAM技术建立了刀具轨迹，完成了适合每位患者的股骨柄制造系统。在β型生物钛合金的切削加工中，尝试提高加工效率。铣削试验用半径端铣刀进行，其尖端由无粘结剂cBN材料制成。确定了最佳切削速度为3.0 ~ 5.0m/s。最后，考虑到使用β型合金的股骨柄形式的重量减轻，新形式的建议没有导致对象处理。少

Although surgical implants as a stem of an artificial hip joint are standardized in several specifications, their variations in size and form are not enough to fit every patient. Therefore in order to make them fit to any patients, it is required that these implants can be manufactured rapidly by machining with application of the patient's medical image data obtained by MRI or X-ray CT. Also titanium alloys without containing vanadium are recently going to applied for surgical implant material in place of conventional type of titanium alloy such as Ti-6A1-4V system, in order to eliminate a toxicological effect of vanadium for human body. In 2002 year, these materials were standardized as titanium alloys for surgical implant in the Japanese Industrial Standard. On the other hand, the temperature rise in the cutting edge is significant in cutting process of titanium alloys including above mentioned vanadium-free alloys, and it promotes strongly the adhesion between tool and work material … More s in general, resulting in tool failure within relatively short duration. So, in order to improve processing efficiency in cutting of titanium alloys, a binderless cBN tool was proposed to apply in cutting of titanium alloys. It was confirmed that a binderless cBN tool exhibited low flank wear and kept sharp cutting edge. In this study, by accumulating the picture photoed using 3D-CT equipment about a patient's affected part form, creation of the CAD data of the in plant form which fits grasp and affected part form in the 3-dimensional form of the affected part was enabled. Moreover, the tool path using CAM was created and the manufacture system of the stem fit for each patient was completed. Improvement of processing efficiency was tried in machining of β type bio-titanium alloys. Milling tests were conducted with a radius end mill tool whose tip was made of binderless cBN material. It is clarified that optimum cutting speed to be the range of 3.0 m/s to 5.0 m/s. Finally about the new form proposal in consideration of the weight saving of stem form using beta type alloy, it did not result in object processing. Less