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

尽管作为人工髋关节柄的外科植入物在几个规范中都是标准化的，但它们在大小和形式上的差异并不足以适应每一位患者。因此，为了使它们适合任何患者，要求这些植入物能够通过应用MRI或X-射线CT获得的患者的医学图像数据进行机械加工来快速制造。为了消除钒对人体的毒害作用，不含钒的钛合金也正逐渐取代传统的钛合金如钛-6Al-4V等作为外科植入材料。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，在包括上述无钒合金在内的钛合金的切削过程中，刀具刃口的温升是显著的，它强烈地促进了刀具与被加工材料…之间的结合。S一般较多，导致刀具在较短时间内失效。因此，为了提高钛合金的加工效率，提出了将无粘结剂CBN刀具应用于钛合金的加工。结果表明，无粘结剂CBN刀具后刀面磨损量小，刀具刃口锋利。在本研究中，通过累积使用3D-CT设备拍摄的关于患者的受影响部位形态的图片，能够在受影响部位的三维形式中创建符合抓取和受影响部位形态的植物内形态的CAD数据。在此基础上，利用计算机辅助设计(CAM)生成刀具轨迹，完成了适合每个患者的刀柄加工系统。在β类生物钛合金的加工中，对提高加工效率进行了尝试。使用刀尖由无粘结剂CBN材料制成的半径立铣刀进行了铣削试验。明确了最佳切割速度为3.0m/S~5.0m/S。最后，考虑到贝塔型合金杆模的重量减轻，提出了新的模样方案，没有进行实物加工。较少

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