熔融沉积丝截面模型及轮廓偏置算法研究  

Research on Model of Section of Filament and Algorithm of Contour Offsetting in FDM Process

作　　者：周朕 刘凯[1] 王扬威[1] ZHOU Zhen;LIU Kai;WANG Yang-wei(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Jiangsu Nanjing 210016,China)

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《机械设计与制造》2018年第11期60-62,66,共4页Machinery Design & Manufacture

基　　金：国家自然科学基金资助项目(51405229);江苏省自然科学基金资助项目(BK20151470;BK20130796)

摘　　要：在研究熔融沉积成型加工误差的基础上,提出了改进的丝截面模型,建立了挤出机喷嘴直径和丝截面宽、高之间的关系。分析了出丝直径和挤出速度的关系,挤出速度不同会导致加热腔内部压力不同,使得出丝直径产生一定的膨胀,得到出丝速度越快,出丝直径越大的结论,通过加工试验测得了材料在一定条件下的出丝膨胀系数,并通过加工试验来对出丝直径和截面模型进行验证。根据丝截面模型的几何参数,结合材料的属性,提出了轮廓偏置算法,对外围轮廓进行尺寸补偿。试验结果表明:使用该丝截面模型和轮廓偏置算法,熔融沉积成型加工精度较高,表面质量较好。Based on the research of the error of molding with Fused Deposition Modeling(FDM),a new model of section of filament was raised to build the relationship between width,height and the diameter of nozzle.And the relationship between the diameter of filament and speed of filling was analyzed to prove that,the difference of speed of filling has an effect on the pressure of cavity.The theory proved that,greater pressure makes the filament wider.Test got the coefficient of expand of filament and proved this theory.An algorithm of contour offsetting was also raised based on the model of section of filament to compensate the contour.The test proved:the model and algorithm can improve the accuracy of FDM process.

关 键 词：快速成型 熔融沉积成型 丝截面 轮廓偏置 

分 类 号：TH16[机械工程—机械制造及自动化]