Elimination of burr formation during end milling of Polymethyl Methacrylate (PMMA) through high speed machining

Amin, A. K. M. Nurul and Syaban, M. and Mahmud, Md. Asif (2011) Elimination of burr formation during end milling of Polymethyl Methacrylate (PMMA) through high speed machining. In: Advanced Machining Towards Improved Machinability of Difficult-to-Cut Materials. IIUM Press, Kuala Lumpur, Malaysia, pp. 233-237. ISBN 9789674181758

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Abstract

A burr is a raised edge or small pieces of material remaining attached to a workpiece after it has undergone machining. The Burr, Edge and Surface Technology (BEST) Division, the Society of Manufacturing Engineers defines a burr as “an undesirable projection of material that results from cutting, forming, blanking or shearing operation [1]. The first stage, chip formed in front of the cutting tool with a positive shear angle, φ. The plastic zone around the primary shear zone is extended towards the work edge when cutting tool advance toward the work edge.There are four basic types of burr that have been defined by researchers which are: poisson, roll-over, tear burr and cut-off burr [2-3]. The four specific types of burr are: Roughness refer to the small, finely spaced deviations from the nominal surface, which is determined by the material characteristics and the process that formed the surface [4]. The theoretical surface roughness, �� can be estimated using the following equation [5] �� = �� � / 32(R ± ���� / π) (1) Where �� is the surface roughness, �� is the number of teeth on the cutter, R is the radius of the cutter, �� is the feed per revolution and the (+) sign refers to up-milling and the (-) sign refers to down milling.The above equation does not consider many factors that in reality can affect the surface roughness. For this reason the surface roughness will generally be higher than that predicted by Eq. (1). Statistical models that include such factors as depth of cut and spindle speed in addition to feed rate have been developed [6].

Item Type:	Book Chapter
Additional Information:	2872/23610
Uncontrolled Keywords:	burr formation, polymethyl Methacrylate (PMMA)
Subjects:	T Technology > TS Manufactures
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Dr. A.K.M. Nurul Amin
Date Deposited:	27 Apr 2012 15:12
Last Modified:	14 Sep 2012 08:49
URI:	http://irep.iium.edu.my/id/eprint/23610

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