关键词: 碳纤维增强树脂基复合材料, 多刃微齿铣刀, 表面粗糙度, 左旋切削刃切削面积

Abstract: When CFRP was machined by a right-handed cutting edge milling tool, the fiber layers were subjected to unidirectional axial forces and was liable to cause delaminations and burr damages. Multi-tooth milling tool with the left and right-handed cutting edges coexisting the two-way axial forces on the fiber layers might effectively restrain the damages. However, how to ensure that each layer of fibers was subjected to the cutting actions of left and right-handed cutting edges becomes the key to suppressing damages. Herein, selecting the multi-tooth milling tool as the research object, three types of multi-tooth milling tools with continuous, overlapping and discontinuous cutting area of left-handed cutting edge were obtained by designing different angles of left-handed helical grooves. The testing results show that there are a few burrs and flanges on the surfaces of CFRP when the cutting area is continuous. When the cutting area overlaps, there is no burrs and tear damages on the surfaces of CFRP. When the cutting area is discontinuous, there are a lot of burrs and tear damages on the machined surfaces. In addition, the surface roughness increases as the angle of left-handed helical groove increases.

Key words: carbon fiber reinforced plastic（CFRP）, multi-tooth milling tool, surface roughness, cutting area of left-handed cutting edge