基于可变形带的碳纤维增强树脂基复合材料3D打印  

Carbon fiber reinforced resin matrix composites 3D printing based on deformable tape

作　　者：龙海波 毕庆贞[1] LONG Haibo;BI Qingzhen(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《现代制造工程》2022年第7期18-24,10,共8页Modern Manufacturing Engineering

摘　　要：具有复杂镂空/凸起等高曲率轮廓的大尺寸碳纤维增强复合材料零件的自动化加工较为困难,为此提出了一种横向铺带的3D打印工艺。该工艺采用约40 mm长的短切碳纤维带横向拼接形成碳纤维横带。由于横带的长度方向缺乏纤维增强,因此在其两端进行不同程度的拉伸时,碳纤维横带可变形成弧形,从而打印成曲线路径,适应高度复杂零件的轮廓。碳纤维横带的宽度可通过改变短切碳纤维带的长度进行调节,其厚度可通过改变短切碳纤维带的搭接比例或改变横带拉伸变形比例进行调节,从而进一步提高打印灵活性。通过强度测试,采用该打印工艺制成的材料沿碳纤维增强方向的拉伸强度可达到220 MPa(碳纤维体积分数为25%)。最后,通过打印圆环零件验证了该工艺打印高曲率零件的有效性。The automated method with high production rate is nearly unavailable for large-sized carbon fiber reinforced composites part with complex hollow or bulge contours.Therefore,a 3D printing method based on deformable tape was proposed.The tape is composed of 40 mm long short carbon fiber strips which are all distributed along the width direction of the deformable carbon fiber tape.Due to the lack of fiber reinforcement along the length direction,the deformable tape can be stretched and deformed into arc-shaped when stretching differently along two edges of the tape,so as to print curve paths to adapt to the contours of the highly complex parts.The width of the deformable carbon fiber tape can be changed by using different length of short carbon fiber strips and the thickness can be controlled by changing the lap ratio of the short carbon fiber strips or changing the deformation ratio,so as to improve the printing flexibility.The tensile strength of the printed material is 220 MPa along the fiber direction(carbon fiber volume fraction is 25%).Finally,the validity of the method is verified by printing ring-shaped part.

关 键 词：3D打印 自动铺带/铺丝机 复合材料 纤维增强 

分 类 号：TH69[机械工程—机械制造及自动化]