Laporan Akhir Projek Penyelidikan Jangka Pendek ... - ePrints@USM

tnt J Adv Manuf Technolhas been developed for the measurement of surfaceroughness of the workpiece in turning operations withinthe workshop area. The measurement is carried out inbetweencutting processes, i.e. in-cycle, without removingeither the cutting tool or workpiece from the machine.2 System configuration2.1 System setupFig. 1 System setup on lathe machineand not suitable for in-cycle measurement of roughness inthe workshop area.In-process monitoring of surface roughness is impoltantbecause the effect of tool wear on surface finish can beassessed directly. Although many optical methods formeasUling tool wear and surface roughness have beenproposed in the past, these methods either require the toolor the workpiece to be removed from the machine andinspected in the laboratory. In this research, a vision systemThe system used for measuring the tool wear and surfaceroughness is shown in Fig. 1. A high-resolution (1392 x1040 pixels) CCD camera (JAI CV-A1) was used to capturethe images of the cutting tool and workpiece. The camerawas fitted with a 50 mm lens (model GMHR35028MCN;Goyo Optical Inc., Japan) for measuring tool wear area anda 25 mm lens (model GMHR32514MCN) for measuringworkpiece roughness. A 110 mm extension tube was fittedto increase the optical magnification. Backlighting wasused to capture the contour of the cutting tool andworkpiece. The position of the camera was adjusted sothat either the cutting tool or workpiece surface could becaptured. The use of the 50 mm lens resulted in a large!field-of-view due to the increase in object-to-Iens distance.Since the use of a long extension tube could result in imageFig. 2 Images of Ronchi rulings.a, b 25 mm lens. c, d50 mm lense'--zg-K··k~1 - i=512,~." ,J4 f,> mFI I Ij=20 j=648 j=1276ab'.t··t!;=1014~f '4;: ".'..,Y~c.,)-;=201;=512;=1014J=20 j=648Cj=1276d