An Experimental Study on Bushing Formation during Friction Drilling of Titanium Grade 2 for Medical Applications

IF 3.3 Q2 ENGINEERING, MANUFACTURING

Journal of Manufacturing and Materials Processing Pub Date : 2023-12-06 DOI:10.3390/jmmp7060220

H. Vanhove, Ecem Ozden, Joost R. Duflou

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Abstract

Recent advances towards patient specific titanium sheet based medical implants introduce a new challenge for the fixation of these implants to bones. Mainly, the use of locking screws requires an implant thickness of approximately 2 mm for screw thread formation. Friction drilling is a hole-making process that displaces material to create a bushing below the sheet rather than extracting material. This experimental study explores the influence of axial force, rotational speed, and workpiece pre-heating temperature on the bushing height and thickness during friction drilling of titanium grade 2 sheets. The drilling parameters are optimized for both drilling at room temperature and at elevated temperatures for maximum bushing thickness with at least a bushing height of 1 mm. Subsequently, the samples are characterized for their microstructure and hardness, revealing preserved strength with a larger thermomechanical affected zone (TMAZ), a more gradual hardness gradient around the drill zone, and a significant reduction in microdefects in the bushing structure of the pre-heated sheets.

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医用 2 级钛摩擦钻孔过程中衬套形成的实验研究

近年来，基于患者特异性钛片的医疗植入物为这些植入物的骨固定带来了新的挑战。主要是，使用锁定螺钉需要大约2mm的种植体厚度来形成螺纹。摩擦钻孔是一种制造孔的过程，它取代材料在薄片下面形成衬套，而不是提取材料。本实验研究了2级钛板摩擦钻孔过程中轴向力、转速、工件预热温度对衬套高度和厚度的影响。钻井参数针对室温和高温下的最大衬套厚度进行了优化，衬套高度至少为1mm。随后，对样品的微观结构和硬度进行了表征，结果表明，在较大的热机械影响区(TMAZ)下，样品的强度保持不变，钻区周围的硬度梯度更加平缓，并且预热板的衬套结构中的微缺陷显著减少。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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