进给速度对不同纤维方向CFRP铣削表面形貌的影响

采用金刚石涂层硬质合金铣刀对0°、45°、90°、135°4种纤维方向的碳纤维增强复合材料(CFRP)进行了顺铣加工试验。通过对铣削力和加工表面形貌的对比,分析了纤维方向和每转进给量对加工表面质量的影响。结果表明:主切削力随着每转进给量的增大而增大,0°方向纤维受到的主切削力最大,90°方向纤维受到的主切削力最小;0°方向纤维表面破碎树脂与纤维的残留随着每转进给量的增大而增多,135°方向纤维表面树脂粘附逐渐减小;90°方向纤维表面会有大小不同的微坑,同时在样件上、下表面易产生分层缺陷,45°方向纤维表面多呈现沟槽或波浪形形貌。

Influence of feed speed on surface morphology of CFRP with different fiber directions during milling

Down milling processing test was conducted on carbon fiber reinforced plastics (CFRP) of four fiber directions (0°, 45°, 90°, 135°) by using a diamond coated cemented carbide tool. The effects of fiber direction and feed per rotation on processing surface quality were analyzed through comparing milling force and processing surface morphology. The results show that the main cutting force increases with the increase of feed per rotation. The maximal main cutting force is obtained with 0° fiber direction, while the main cutting force reaches its minimum value with 90° fiber direction. With the increase of feed per rotation, more broken resin and fiber could be left on surface of the workpiece with 0° fiber direction, while the adhesion of soften resin could be lightened on surface of the workpiece with 135° fiber direction. There are many shallow voids on surface of workpiece with 90° fiber direction, delamination of top and bottom laminate layers are observed at the same time. The finished surface of the workpiece with 45° fiber direction shows groove or wave-like surface morphology.