摘要
采用传统FDM设备打印柔性丝材时,由于送丝力过大,易出现丝材弯折和回抽困难等问题,导致打印失败。在丝材FDM打印头上同时实现软硬材料的打印,有利于拓宽FDM 3D打印的应用领域。提出了一种仅通过改变弹簧尺寸来调节送丝力的简便有效方法,从而保证不同硬度材料的稳定打印。通过观察打印过程中送丝稳定性情况和成型制件的表面质量,得到适合材料打印的最佳弹簧弹性系数。研究结果表明:保证丝材稳定打印的送丝力随丝材硬度的增大而增大,适合TPE-83A、TPU-87A及TPU-95A三种柔性材料打印的合适的弹簧弹性系数分别为0.37 N/mm^0.48 N/mm、0.37 N/mm^0.70 N/mm、0.48 N/mm^1.32 N/mm;选择合适弹性系数的弹簧进行大尺寸样件打印时,打印稳定性良好,且制件表面质量佳,充分说明该方法的合理性。该研究结果对进行FDM送丝机构的结构设计具有借鉴意义。
The wire feeding force is too large when the flexible wire is printed by conventional FDM device.It is prone to problems such as wire bending and difficulty in drawing back,resulting in printing failure.FDM printer can print flexible and hard materials by one wire print head is conducive to broaden the application field of 3D printing.This paper proposes a simple and effective method to adjust the wire feeding force only by changing the size of the spring,so as to ensure stable printing of different hardness materials.By observing the stability of the wire during printing and the surface quality of the workpieces,the optimum elasticity coefficient of spring is obtained.The results show that the wire feeding force for stable printing can be increased with hardness of the wire increasing.The suitable elasticity coefficient of spring for printing the three flexible materials of TPE-83A,TPU-87A and TPU-95A are respectively 0.37 N/mm-0.48 N/mm,0.37 N/mm-0.70 N/mm,0.48 N/mm-1.32 N/mm.The surface quality of the workpieces and the printing stability are good when selecting a spring with suitable elastic coefficient for large-size sample printing.The research results fully illustrate the rationality of the method.The method is useful for the structural design of the FDM wire feeding mechanism.
作者
王晓
王彦丽
王宁宁
吴华英
WANG Xiao;WANG Yan-li;WANG Ning-ning;WU Hua-ying(National Innovation Institute of Additive Manufacturing,Xi′an 710117,China;School of Mechanical Engineering,Xi′an Jiaotong University,Xi′an 710049,China)
出处
《机械工程与自动化》
2020年第1期1-3,共3页
Mechanical Engineering & Automation
基金
国家自然科学基金资助项目(51805417)
国家科技重大专项(2014ZX04011021)
关键词
3D打印
FDM
柔性材料
弹性系数
3D printing
FDM
flexible materials
elasticity coefficient
