On the characterization of machined surfaces of Perspex samples under different conditions in surface finishing

Abstract

The present study deals with the characterization of machined surfaces and chips generated during surface finishing of Perspex samples under different machining conditions. The machining is carried out using a horizontal push-cut type shaper machine with a single point V-shaped HSS cutting tool, where the cutting speed and depth of cut are varied while the stroke length is kept constant. The machined surfaces are characterized in terms of a number of mechanical properties measured directly on the surfaces, which include surface roughness, hardness and temperature. Attempt is also made to characterize the surfaces by the shape and size of the chips generated from the surface. The chip formation characteristics are investigated using digital photographs as well as optical microstructures. The results show that the best surface finish can be obtained for 2mm depth of cut at a cutting speed of 13.3 m/min. At lower cutting speeds, continuous chips are formed from the machined surfaces, while discontinuous chips are observed under higher cutting speeds.