Machinability of fiber-reinforced thermoplastics in drilling

摘要: Polymer-based composite materials are used in a variety of industry. Recently, thermoplastic polymer suitable for the resinous matrix carbon fiber-reinforced composites has been introduced lower material and processing costs, improved damage tolerance higher moisture resistance. The successful use this requires sophisticated production technology, however little reference machining thermoplastics can be found. existing published results almost exclusively epoxy-based showing difficulty avoiding poor finish, serious tool wear delamination at hole entrance exit due to brittle response machining. Thermoplastics-based possesses better machinability. current work reveals machinability an example ABS (Acrylonitrile Butadiene Styrene) drilling compared representative metals thermoset-based composites. observation chips that considerable plastic deformation is involved. Compared chip formation thermoset plastics, it contributes edge quality drilling. generally fine except case concentrated heat accumulation lips, which generated by high cutting speed low feed rate. Plastics tend extruded out rather than neatly cut. average surface roughness along walls commonly below one micron all sets conditions experiment, values between 0.3 0.6 microns typical. steel drill presents only minor during tests. Based on these results, concludes demonstrates good