Surface Finish in Micro-drilling of PTFE
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PDFItem Type:
Conference PaperDate:
2008Access:
openAccessCitation:
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 - 72Download Item:
Abstract:
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.
Author's Homepage:
http://people.tcd.ie/kekellyhttp://people.tcd.ie/cbuckle
http://people.tcd.ie/odonnege
Description:
PUBLISHEDDublin Institute of Technology
Other Titles:
25th International Manufacturing ConferenceType of material:
Conference PaperAvailability:
Full text availableKeywords:
surface finish, Tissue Scaffold, Micro-drillingSubject (TCD):
Next Generation Medical DevicesLicences: