Abstract
Boring Trepanning Association (BTA) drills are capable of machining holes, having large length-to-diameter ratios, in a single pass. This is a unique self-piloted operation in which cutting and burnishing are carried out at the same time. A study of surface integrity, which comprises surface topography and subsurface metallurgy on machined and burnished layers of the work sample in BTA drilling, would reveal quite useful information regarding the performance of BTA drills. Surface integrity is also useful in understanding the functional behaviour of the manufactured part, namely wear, friction etc. This paper deals with surface integrity studies on En — 9 steel samples machined using a BTA drill under different machining conditions. The study includes the analysis of scanning electron micrographs, surface profiles and the variations in microhardness and residual stress on machined and burnished layers with different machining conditions.
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