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Suitability assessment of micro-EDM in machining Nitinol for medical applications

机译：适用于医疗应用加工Nitinol中微EDM的适用性评估

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Among the latest developments in the medical field is the shift from open surgical procedures requiring long healing times to minimally invasive ones. These can lead to drastically reduced recovery times and even be done at out-patient facilities. In the centre of this development is Nitinol, a material which due to shape memory effect, pseudoelasticity and other unique properties, has found numerous applications including in making stents, arcwires and endoscopic instruments. With miniaturization, the challenge to produce these parts feasibly while maintaining high accuracy standards increases. While it is possible to machine Nitinol using conventional manufacturing processes like turning and grinding, these processes are limited for micro- and high precision machining, especially for thin-walled and fragile parts. They generate a lot of tool wear and can also result in unwanted force induced stresses in the workpiece. Micro electrical discharge machining (micro-EDM), a non-contact thermal ablation process which uses electrical discharges to machine the workpiece, can be used to address these challenges as it can realise miniature parts irrespective of their hardness or brittleness. In this paper, the suitability of micro-EDM in machining Nitinol for medical applications is investigated by comparing it to Steel and Tungsten Carbide (WC). Samples are machined using SARIX SX-100 high precision machine and analysis is done with regards to the process quality and dimensional accuracy. The results show that Nitinol is machinable by micro-EDM. However, the process is generally the slowest of the three materials and TWR is high.
机译：在医学领域的最新发展中，从开放的外科手术转变需要长时间愈合时间到微创的手术。这些可能导致恢复时间急剧减少，甚至可以在门外设施完成。在该开发的中心是Nitinol，一种由于形状记忆效应，假弹性和其他独特性的材料，已经发现了许多应用，包括制造支架，弧势和内窥镜仪器。利用小型化，挑战在保持高精度标准的同时，在保持高精度标准的同时产生这些部件。虽然可以使用常规制造工艺的机器镍钛合金，但是，这些方法限于微型和高精度加工，特别是对于薄壁和脆弱的部件。它们产生了大量的工具磨损，也可以导致不需要的力引起工件的应力。微电路放电加工（微型EDM），使用电气放电的非接触式热消融工艺来为工件机械来解决这些挑战，而无论它们的硬度还是脆性，都可以实现微型部件。本文通过将其与钢和碳化钨（WC）进行比较，研究了微EDM在加工镍钛醇中进行Micro-EDM在医疗应用中的适用性。使用Sarix SX-100高精度机器加工样品，并在处理质量和尺寸精度方面进行分析。结果表明，镍钛诺通过微EDM可以加工。然而，该过程通常是三种材料中最慢的，TWR高。

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