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Magnetorheological finishing of UHMWPE acetabular cup surface and its performance analysis
Materials and Manufacturing Processes ( IF 4.8 ) Pub Date : 2020-07-27 , DOI: 10.1080/10426914.2020.1784928
Kunal Arora 1 , Anant Kumar Singh 1
Affiliation  

ABSTRACT Ultra-high molecular weight polyethylene (UHMWPE) is a highly used polymer in the medical field due to its properties such as good mechanical strength, high hardness, good chemical resistance, and excellent biocompatibility. UHMWPE is used for the manufacturing of acetabular cups in hip-joint implantation. For enhancing the life span and functionality of hip implants, the uniform fine surface finish of the acetabular cup is essential. This is because the non-uniform finish can cause wear and friction during different movements of implants which may lead to osteolysis. In the present work, the UHMWPE acetabular cup surface gets fine finished using the hemispherical tool tip-based magnetorheological (MR) finishing process. To study the efficacy of the tool, magnetostatic finite element analysis is used for analyzing the magnetic field. After the experimentation on 1140 mm2 surface area of the UHMWPE acetabular cup, the surface improvement obtained is 66.67% in 100 minutes of the finishing cycle. For the study of surface morphology, circularity, and microhardness on the finished UHMWPE acetabular cup surface, the scanning electron microscopy, co-ordinate measuring machine, and microhardness tester machine are used. Results show that the present process is suitable for the uniform fine finishing of the UHMWPE acetabular cup with improved surface characteristics.

中文翻译:

UHMWPE髋臼杯表面的磁流变处理及其性能分析

【摘要】:超高分子量聚乙烯(UHMWPE)具有良好的机械强度、高硬度、良好的耐化学性和优异的生物相容性等特性,是医疗领域应用广泛的聚合物。UHMWPE 用于制造髋关节植入中的髋臼杯。为了延长髋关节植入物的寿命和功能,髋臼杯的均匀精细表面光洁度是必不可少的。这是因为不均匀的光洁度会在植入物的不同运动过程中引起磨损和摩擦,从而导致骨质溶解。在目前的工作中,UHMWPE 髋臼杯表面使用基于半球形工具尖端的磁流变 (MR) 精加工工艺进行精加工。为了研究工具的功效,使用静磁有限元分析来分析磁场。在对 UHMWPE 髋臼杯的 1140 mm2 表面积进行实验后,在精加工周期的 100 分钟内获得的表面改善为 66.67%。为了研究成品UHMWPE髋臼杯表面的表面形貌、圆度和显微硬度,使用扫描电子显微镜、坐标测量机和显微硬度计机。结果表明,本工艺适用于具有改善的表面特性的 UHMWPE 髋臼杯的均匀精加工。使用三坐标测量机和显微硬度计机。结果表明,本工艺适用于具有改善的表面特性的 UHMWPE 髋臼杯的均匀精加工。使用三坐标测量机和显微硬度计机。结果表明,本工艺适用于具有改善的表面特性的 UHMWPE 髋臼杯的均匀精加工。
更新日期:2020-07-27
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