Browsing by Author "Enever, A. A."

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    Investigating the performance of custom manufactured cermet mounted points when grinding Ti6Al4V alloys
    (Central University of Technology, 2017) Enever, A. A.; Oosthuizen, G. A.; Sacks, N.; Burger, M. D.; Oberholzer, J. F.
    ENGLISH ABSTRACT: The use and implementation of mounted grinding points in industrial applications are wide spread, ranging from the bio-medical and automotive industries to the aerospace and mining industries. These smaller variants of the larger, more conventional grinding wheels are more affordable to produce, but equally effective in grinding applications. Generally, the abrasive materials implemented in the manufacturing of mounted points do not include the cermet WC-12-wt-%-Co, but rather use alumina- or silicon carbide. This study investigates the use of this WC-12-wt-%-Co cermet as abrasive medium. The resin was varied to manufacture two sets of cermet WC-12-wt-%-Co mounted points that contained 12-wt-% and 16-wt-% resin content, respectively. The grinding performance of these mounted points were evaluated in terms of the tool wear rate, the surface finish and the surface hardening of the Ti6Al4V work piece. The grinding tool wear rate of the 16-wt-% mounted points were more gradual than for the 12-wt-%. The 16-wt-% mounted points produced a smoother surface finish and work hardening occurred on most of the Ti6Al4V work piece surfaces.
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    Performance evaluation of custom manufactured WC-12wt%Co abrasive grinding wheel
    (Faculty of Engineering, Department of Industrial Engineering, Stellenbosch University, 2016) Enever, A. A.; Oosthuizen, G. A.; Sacks, N.
    Grinding is a material removal process making use of geometrically nondefined tool edges, or abrasive particles, which is bonded together in the form of a grinding wheel to cut, or machine, a material into shape. The materials used as the abrasive is most commonly aluminium oxide or silicon carbide. These abrasives are normally bonded with a vitrified or resinoid bonding to form the grinding wheel. Grinding wheel applications typically range from wood and soft metal grinding to hard carbide steel and ceramic grinding. There is thus a gap in the variety of available grinding wheels for a multipurpose grinding wheel. This paper will explore the application of tungsten carbide (WC-12wt%Co) as an alternative abrasive material for a grinding wheel and will be bonded with inexpensive resin. Tungsten carbide falls in the cemented carbide family of hard materials, having a high hardness-to-toughness ratio. This is advantageous for the machining of titanium alloys and is the workpiece material. The paper will describe the process of custom manufacturing of the WC-12wt%Co grinding wheels for experimental purposes.