Kim, Yong-hwan, Ph.D. (1989) Behaviour of polymeric materials in machining. PhD thesis, University of Warwick.

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Abstract

The machining characteristics of a glassy thermoplastic
(Polyvinyl Chloride) and a semi-crystalline thermoplastic (High
Density Polyethylene) have been studied. Chip formation
mechanisms, cutting forces and surface integrity were found to
be dependent, on the cutting conditions and tool geometry.
Results were explained by considering the different nature of
the microstructure. Segmented and discontinuous chips were
produced with PVC, and continuous and segmented chips were
produced with HDPE. It was observed that surface damage was
closely related to the nature of chip formation in these
plastics.
Chip formation, surface damage and tool wear mechanisms when
machining Glass-Fibre-Reinforced-Plastic (GFRP) were also
studied. Cutting tools used were High-Speed-Steel (HSS),
cemented carbide (P type and K type) and coated carbide
(titanium carbide - and triple-coated). Discontinuous chips
were always produced when machining GFRP. Sliding contact is
present at the tool/chip and tool/work interface. The
principal aspects of surface damage include fibre breakage,
resin cracking, resin decomposition and fibre/resin interface
debonding. Cutting temperature is not high, but excessive heat
generates when the flank wear land develops. Coated carbide
tools showed the best performance and HSS tools the poorest.
The main wear mechanisms are abrasive wear with HSS tools,
attrition wear with cemented carbides, and discrete plastic
deformation followed by attrition wear with coated carbides.

Item Type:	Thesis (PhD)
Subjects:	T Technology > TJ Mechanical engineering and machinery
Library of Congress Subject Headings (LCSH):	Machining, Polyvinyl chloride -- Machinability, Polyethylene -- Machinability, Glass-reinforced plastics -- Machinability
Official Date:	May 1989
Dates:	Date Event May 1989 Submitted
Institution:	University of Warwick
Theses Department:	School of Engineering
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Pashby, Ian
Sponsors:	Korea (South). Kwahak Kisulbu
Extent:	206, [95] leaves
Language:	eng

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