基于螺杆挤出式3D打印设备的双螺杆设计与仿真  

Design and Simulation of Twin Screw based on screw Extrusion 3D Printing Equipment

作　　者：秦望 白海清[1,2] 贾仕奎 任礼 安熠蔚[1] 鲍骏 Qin Wang;Bai Haiqing;Jia Shikui;Ren Li;An Yiwei;Bao Jun(College of Mechanical Engineering,Shaanxi University of Technology,Hanzhong 723001,China;Shaanxi Key Laboratory of Industrial Automation,Hanzhong 723001,China;College of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723001,China)

机构地区：[1]陕西理工大学机械工程学院,陕西汉中723001 [2]陕西省工业自动化重点实验室,陕西汉中723001 [3]陕西理工大学材料科学与工程学院,陕西汉中723001

出　　处：《工程塑料应用》2020年第8期87-92,102,共7页Engineering Plastics Application

基　　金：国家自然科学基金项目(51703121);中国博士后科学基金特别资助项目(2018T111050);陕西理工大学研究生创新基金项目(SLGYCX2028)。

摘　　要：针对熔融沉积成型(FDM)3D打印设备耗材选择范围有限、喷头挤出力不足且易堵塞等问题,基于现有3D打印成型技术和螺杆挤压技术,设计了一种适用于桌面级3D打印成型设备的双螺杆结构,实现了由工业级到桌面级的小型化便捷优化。通过分析其工作机理,确定了挤压系统中核心部件螺杆的基本结构参数,建立了三维实体模型。运用有限元分析方法,研究了螺杆结构受载后的应力和形变分布规律。分析结果表明,新型螺杆在工作载荷下,最大形变量出现在螺杆头部,且只有0.031 mm,满足螺棱间隙范围和螺杆刚度要求;螺杆根部受到较大的扭矩,最大应力强度和剪应力均出现于螺纹起始外端面处,且各项应力指标均满足强度要求,此结果与基于理论计算的强度校核结果一致,说明该螺杆能正常工作运转,进一步说明该新型螺杆结构设计合理,从而为更深一步的热流体熔融挤压分析研究提供理论基础。Aiming at the problems of limited selection of consumables,insufficient extrusion force of nozzle and easy blockage of fused deposition modeling(FDM)3D printing equipment,based on the existing 3D printing technology and screw extrusion technology,a twin-screw structure suitable for desktop 3D printing equipment was designed,which realized the miniaturization and convenient optimization from industrial level to desktop level.By analyzing its working mechanism,the basic structural parameters of the core component screw in the extrusion system were determined,and a three-dimensional solid model was established.The distribution law of stress and deformation of screw structure after loading were studied by using the method of finite element analysis.The results show that under the working load,the maximum deformation of the new screw appears at the head of the screw,and only 0.031 mm,which meets the requirements of the clearance range of the screw ribs and the rigidity of the screw;the root of the screw is subject to a large torque,and the maximum stress intensity and shear stress appear at the initial outer end face of the screw.The results are consistent with the strength check results based on theoretical calculation,which shows that the screw can work normally,and further shows that the new screw structure design is reasonable,so as to provide a theoretical basis for further research on hot fluid melt extrusion.

关 键 词：三维打印成型设备 结构设计 强度校核 静力学分析 应力分布 

分 类 号：TQ320.5[化学工程—合成树脂塑料工业]