【作者】 王永杰；

【导师】 张毅； 王辉；

【作者基本信息】 西京学院 ， 工程硕士（专业学位）， 2021， 硕士

【摘要】 FDM型3D打印是一种增材制造技术,因其具有设备价格便宜、体积小、使用方便和便于维护等优点,被广泛地应用在航空航天、能源交通、军事、医疗和文化创意等领域。FDM型3D打印模型是由从喷头挤出的熔融态材料层层叠加堆积而成。从喷头挤出的熔融态材料在与下层已固化的模型粘接时,会出现层与层之间粘合不牢固,甚至产生开裂和断裂现象。本文针对上述情况,拟研发一种基于激光熔接技术的FDM型3D打印系统。该系统利用激光熔,将打印喷头移动路径上已固化的材料加热,使从打印喷头挤出的熔融态材料与下一层材料更好的粘结在一起,以增加3D打印模型层与层之间的粘合力,提高3D打印模型的拉伸强度。该系统由打印装置、激光旋转加热装置和控制装置等组成。打印装置负责3D模型的打印,激光旋转装置利用激光束照射喷头移动路径前方已固化的材料,使从喷头挤出的熔融态材料与下层已固化的材料更好地粘结在一起。控制装置用于控制打印装置和激光旋转加热装置的运行。本文设计制作了一台原理样机,用以进行3D打印模型的抗拉试验。结果表明,使用Nd:YAG固体激光器(20W)辅助加热制得的3D打印模型,在堆叠方向上的拉伸强度比用传统方法制得的3D打印模型的拉伸强度提高了39%。更多还原

【Abstract】 FDM 3D printing is an additive manufacturing technology,which is widely used in aerospace,energy transportation,military,medical,cultural and creative fields due to its advantages of cheap equipment,small size,convenient use and easy maintenance.FDM 3D printing model is composed of layers of molten material extruded from the nozzle.When the molten material extruded from the nozzle is bonded with the solidified model at the lower layer,the bonding between layers is not firm,and even cracks and fracture occur.In view of the above situation,this paper intends to develop a FDM 3D printing system based on laser welding technology.The system uses laser melting to heat the solidified material on the moving path of the printing nozzle,so that the molten material extruded from the printing nozzle is better bonded with the next layer of material,so as to increase the adhesion force between layers of the 3D printing model and improve the tensile strength of the 3D printing model.The system consists of printing device,laser rotary heating device and control device.The printing device is responsible for 3D model printing,and the laser rotating device uses the laser beam to illuminate the solidified material in front of the moving path of the nozzle,so that the molten material extruded from the nozzle is better bonded with the solidified material below.The control device is used to control the operation of the printing device and the laser rotary heating device.In this paper,a prototype is designed and manufactured for tensile test of 3D printed models.The results show that the tensile strength of the 3D printed model prepared by the Nd:YAG solid-state laser(20W)is 39% higher than that of the 3D printed model prepared by the traditional method.更多还原