Grinding is one of the mandatory methods for fabrication of precise glass fibre reinforced plastic (GFRP) parts. In this work, grinding studies were carried out on GFRP using a CBN wheel. The grinding process was performed at different cutting speeds, feed rates and depth of cuts. Grinding performance was evaluated by measuring forces and surface roughness of the ground GFRP composite laminate material. The effects of coolants in grinding the composite laminate material were investigated. Test results showed that in most cases, dry grinding achieved the greatest material removal rate and the lowest surface area roughness (Sa). Higher speed tends to produce better surface finish in dry grinding. Surface area roughness produced in wet grinding shows random and drastic variations. Surfaces ground in synthetic coolant show clean, hard and smooth matrix, and are in general better quality than those ground with emulsion coolant. Optical and electron microscopy was used to evaluate the grinding mechanism of GFRP laminate material. Surface profile waviness is the predominating factor contributing to surface area roughness over surface peaks and valleys.
2 A grindability study of chopped strand mat glass fiber reinforced polymer laminates (CSM GFRP) has been carried out to evaluate the effects of abrasive types on grinding force ratio and area roughness at varying grinding parameters such as speed, feed and depth of cut. Performances of alumina (Al 2 O 3 ) and cubic boron nitride (CBN) wheels were compared. Both wheels delivered the maximum grinding force ratios at low speed, high feed and low depth of cut. Alumina wheel produced smoother surface when grinding at low speed, low feed and high depth of cut. CBN wheel, on the other hand, gave smoother surface at high feed and low depth of cut conditions, regardless of speed. With CBN wheel, it is likely that a single grinding condition exists that maximizes grinding force ratio and minimizes area roughness. The findings indicate that CBN wheel exhibited higher grinding force ratio than alumina grinding wheel in general. CBN grinding wheel also outperformed alumina grinding wheel by producing smoother ground surface in most cases.
In this research the influencing process parameters on fused deposition modelling of Acrylonitrile Butadiene Styrene (ABS) parts were studied. The two process parameters, layer thickness and model interior fill style are studied. The specimens were built, tests carried out to find out the surface roughness quality of the specimens. The results analyzed using Response Surface Methodology (RSM). The result indicates that the specimen Type 1 with the 0.254mm layer thickness and solid model interior fill style is the best specimen among the types of specimens tested.
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