Abstract
Polymer composites are currently used in several applications where lightness and strength are crucial. But it so happens that, due to their final application, many parts need to be machined, especially those used in aeronautical sectors and the automotive (air bag propellant chambers, chassis, cluth plates etc). In this context, glass-fiber-reinforced polyamides are presented as materials of wide application in the industry, including for obtaining precast elements. Thus, it is important to generate knowledge on the behavior of this type of material during the machining operations in order that quality components can be produced. Drilling is probably the most widely used machining process in fiber-reinforced composites. This is due to the fact that, regardless the part-manufacturing process (injection, extrusion, etc), drilling will be requested at some point in the production line. The present work analyzed the influence of cutting speed, feed rate and tool tip angle on the dimensional deviations of holes, circularity error, fiber pull out and burr formation. The tests were carried out using high-speed-steel drills and polyamide-reinforced with 25% glass fiber. The samples were obtained by injection molding process according to ASTM D 638, being drilled and analyzed. It was noted that dimensional quality in the machining composites was reached using low cutting speeds.
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