Effect of Tool Shape on Precision Hole-cutting of Laminated Composite Materials

摘要

Carbon Fibre Reinforced Plastics (CFRP) has higher specific strength, modulus of elasticity and so on. In the newly application for wind turbines, CFRP will be remarkably used for rotor blades. It is already widely applied for aviation and automobile parts in these days. CFRP is laminated for production parts with some metals which are aluminium and titanium alloys. These manufactured parts have containing many holes for various purposes such as rivet holes. The precision hole-cutting process on the parts of laminated composite materials is a very important machining technology [1]. In this research, it is considered that the effect of tool shape on precision hole-cutting process of laminated composite materials in order to improve the quality of machined holes and the machinability of hole numbers. Hole-cutting tests of CFRP laminated plates in our experiments are carried out using various types of end mill which have different shapes by helical cutting method on the machining centre. In these experimental results, the thrust forces Fz by using ball nose type of end mill is smaller than that by using square end mill and so on. When the ball nose end mill is applied, the thrust forces are reduced and the better surface roughness on the inside of machined holes is obtained without delamination and burrs of holes. Cutting edges and margins of the ball nose end mill used are worn by small and small in cutting processes. DLC coated ball nose shape of cutting tool is suitable for precision-cutting of laminated composite materials which are CFRP, aluminium alloy and titanium alloy.