面向FDM筒形件尺寸收缩特性的数值模拟研究

南思豪; 刘健; 关舒文

doi:10.13433/j.cnki.1003-8728.20200021

面向FDM筒形件尺寸收缩特性的数值模拟研究

doi: 10.13433/j.cnki.1003-8728.20200021

西安理工大学印刷包装与数字媒体学院, 西安 710048

基金项目:

陕西省自然科学基础研究计划项目 2019JM-180

详细信息

作者简介:
南思豪(1995-), 硕士研究生, 研究方向为3D打印仿真分析, 1486107850@qq.com

通讯作者:
刘健, 副教授, 硕士生导师, liujian@xaut.edu.cn

中图分类号: TH164
计量
- 文章访问数: 138
- HTML全文浏览量: 85
- PDF下载量: 17
- 被引次数: 0
出版历程
- 收稿日期: 2019-09-20
- 刊出日期: 2021-01-01

Study on Numerical Simulation of Size Shrinkage Behavior for Cylindrical Parts via FDM

Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi′an University of Technology, Xi′an 710048, China

摘要

摘要: 针对筒形件在熔融沉积成型(fused deposition modeling, FDM)过程中产生的尺寸收缩问题，建立了筒形件成型过程的有限元模型，基于"生死单元技术"编写了成型过程的温度场、应力场仿真分析命令流，对筒形件熔融沉积成型过程进行了热力耦合数值模拟，探讨了3D打印及冷却过程中筒形件的尺寸收缩机理。结果表明，筒形件在径向的温度梯度分布很不均匀，且等效应力较大; 而轴向的温度梯度分布较为均匀，等效应力较径向小。径向和轴向温度梯度的差异导致筒形件在径向收缩大、轴向变形小。
- 熔融沉积成型 /
- 尺寸收缩 /
- 热力耦合 /
- 生死单元
Abstract: In order to reveal the shrinkage mechanism of the cylindrical parts in the fused deposition modeling (FDM), the finite element model for the building process of the cylindrical part was established. Based on the "birth-death element technology", the command flow of temperature field and stress field was programmed, and the coupling thermo-mechanical numerical simulation in the building process of the cylindrical parts was carried out. The simulation results show that the radial temperature gradient distribution of the cylindrical parts is very uneven and the equivalent stress is high; while the axial temperature gradient distribution is relatively uniform, and the equivalent stress is lower than the radial one. The difference between the radial and the axial temperature gradients results in large radial shrinkage and small axial deformation in the cylindrical parts.
- fused deposition modeling(FDM) /
- size shrinkage /
- thermo-mechanical coupling /
- birth-death element

HTML全文

图 1 熔融沉积成型筒形件

下载: 全尺寸图片幻灯片

图 2 熔融沉积成形筒形件的有限元模型

下载: 全尺寸图片幻灯片

图 3 FDM成型过程热力耦合有限元模拟流程图

下载: 全尺寸图片幻灯片

图 4 成型件成型及冷却过程温度分布云图

下载: 全尺寸图片幻灯片

图 5 极坐标系下成型结束时刻模型温度梯度云图

下载: 全尺寸图片幻灯片

图 6 模型Mises等效应力分布云图

下载: 全尺寸图片幻灯片

图 7 筒形件纵剖面内等效应力分析单元节点的选取路径

下载: 全尺寸图片幻灯片

图 8 成型结束时刻不同路径等效应力分布曲线

下载: 全尺寸图片幻灯片

图 9 模型纵剖面位移变形云图

下载: 全尺寸图片幻灯片

图 10 冷却120 s后模型位移变形云图

下载: 全尺寸图片幻灯片

表 1 筒形件尺寸理论值与实验值对比

名称	理论值/mm	实验值/mm	尺寸相对变化量/%
高度	3	2.99	0.33
内径	5	4.822	3.56
外径	9	8.883	1.3

下载: 导出CSV

表 2 PLA材料参数

温度/℃	47.5	54.9	60.3	109.3	134.9	145.6	152.0	172.3
比热容/(J·(kg·K)^-1)	1560	1700	1820	1900	2320	4360	2100	1980
密度/(kg·m^-3)	1250	1250	1250	1250	1250	1250	1250	1250
导热系数/(W·(m·K)^-1)	0.231
弹性模量/MPa	3500
泊松比	0.35
热膨胀系数/(K^-1)	1.3 ×10^-5

下载: 导出CSV

表 3 钢化玻璃底板材料热物理参数

比热容/(J·(kg·K)^-1)	密度/(kg·m^-3)	导热系数/(W·(m·K)^-1)	弹性模量/MPa	泊松比	热膨胀系数/(K^-1)
750	2 500	1.09	72 000	0.2	9×10^-6

下载: 导出CSV

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