Abstract: The carbide twist drill was used for drilling experiments of 3 mm diameter small hole in carbon fiber reinforced resin matrix composites. The effects of process parameter and tool wear on the cutting force and the hole quality were studied. Firstly， the drilling force with different process parameters was measured by drilling test. The relationships between the thrust force， torque， rotational speed and feed speed were obtained by regression analysis. Then， the change curve of flank wear with the number of holes drilled was obtained using tool wear experiment. The relationship between burr area and drilling torque was obtained by measuring and fitting the hole exit burrs. Finally， the maximum material removal rate was regarded as the optimization goal， and drilling without delamination and burr damage meeting the requirements were chosen as the constraint conditions. The optimal rotational speed and feed speed were obtained by establishing the optimization model of drilling process parameters.

Key words: carbon fiber reinforced composites, small hole, drilling, burr, process parameter, optimization