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Surface Finish in Micro-drilling of PTFE
Surface finish of engineering components pl ays a key role in their functionality, particularly where the size of the geometric feat ures of the component decreases. This paper reports on such an application ? the drilling of micro-holes in PTFE during manufacture of molds for use in the bio-medical field. These mo lds are used for production of silicone scaffolds requiring very large aspect ratios ? typical exam ples being to produce pillars/columns of 300 micron diameter and 15 mm length. The surface fi nish of the holes machined in the PTFE becomes critical in order to facilitate extractio n of the silicone from th e mold without damage. A systematic approach is used to determine th e optimum combination of machining parameters with respect to this goal. Furthermore, a novel approach to surface quality estimation is proposed. Direct methods of surface quality assessment in this a pplication are difficult due to the scale of the holes ? conventional measuremen t methods are expensive, time-consuming and require destruction of the mold. In this work, the quality is inferred indirectly through measurement of the force required to extract the silicone from the mold. A simple apparatus to standardize the extraction procedure has been designed and built as part of this work.
Keyword(s): surface finish; Tissue Scaffold; Micro-drilling; Next Generation Medical Devices
Publication Date:
Type: Conference item
Peer-Reviewed: Yes
Language(s): English
Institution: Trinity College Dublin
Citation(s): Kelly, K., Buckley, C., O'Donnell, G.E., Ervine, P., Surface Finish in Micro-drilling of PTFE, 25th International Manufacturing Conference, Dublin Institute of Technology, 3 - 5 Sept, Robert Simpson, 2008, 65 - 72
Alternative Title(s): 25th International Manufacturing Conference
First Indexed: 2015-07-08 05:42:26 Last Updated: 2020-10-30 07:12:18