Abstract
The purpose of this work is to improve the quality of surface and accuracy of holes and edges at machining of carbon fiber reinforced composite material by cutting conditions optimization. The robotic complex based on the KUKA KR210 R2700 EXTRA industrial robot was chosen as the main processing equipment. The object of the study is a carbon fiber plate of IMS 24K / PRISM EP 2400RS brand with the thickness of 16 mm. Drilling was performed with a CoroDrill 856-1-0635-05-A0 drill bit made by Sandvik Coromant with the diameter of 6.35 mm. This tool is a solid carbide drill with N20C diamond coating used for drilling high quality holes in composite materials. The milling operation was carried out using a 67-084 1/4 SC FGR milling cutter (Aramid) manufactured by Onsrud. The tool is a coating-free solid carbide cutter used for processing composite materials. The tests included the determination of cutting modes ensuring maximum performance, and the modes for maximum surface quality and accuracy of holes and edges. As part of the tests, the range of values of cutting conditions was chosen. It included the modes recommended by the tool manufacturer. At the end of the works, the roughness of holes and edges was measured using a Taylor Hobson Form Talysurf i200 contact profilometer. Hole diameters were controlled using the Carl Zeiss CONTURA G2 coordinate measuring machine. The dependences of the parameters of obtained roughness on the processing modes have been revealed. The graphs reflecting the variations of roughness and diameters depending on the cutting modes have been plotted as well as the graphs of cutting condition influence on edge surface roughness. Recommendations have been given on the application of composite material machining technologies on an industrial robot.
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