张德海,黄子帆,李俊美,等.熔融沉积成形中扁平椭圆截面挤压宽度模型的分析与实验[J].精密成形工程,2024,16(6):191-200.
ZHANG Dehai,HUANG Zifan,LI Junmei,et al.Analytical and Experimental Modeling of Extruded Width of Flat Elliptical Cross Section in Fused Deposition Molding[J].Journal of Netshape Forming Engineering,2024,16(6):191-200. |
| 熔融沉积成形中扁平椭圆截面挤压宽度模型的分析与实验 |
| Analytical and Experimental Modeling of Extruded Width of Flat Elliptical Cross Section in Fused Deposition Molding |
| 投稿时间：2024-01-23 |
| DOI：10.3969/j.issn.1674-6457.2024.06.023 |
| 中文关键词: 挤压宽度 挤压长丝截面 最大扫描速率 扫描速率与进料速率比率 料丝直径与挤压宽度 |
| 英文关键词: extrusion width extruded filament cross-section maximum scan rate ratio of scanning rate to feeding rate wire diameter and extrusion width |
| 基金项目:国家自然科学基金(52275295);青年科学基金(52006201);郑州科技学院科研项目 |
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| 中文摘要: |
| 目的 在熔融沉积成形工艺中，挤压宽度是一个被忽视的核心参数，它不仅直接影响层高、进料速率、扫描速率等工艺参数，还间接影响打印制件的表面粗糙度、力学性能、尺寸精度和构建时间。因此，必须严格控制挤压宽度。方法 首先在3D打印挤出原理、黏弹性理论和聚合物流变学理论的基础上，提出了扁平椭圆截面模型。然后将该模型的理论计算结果与实验测量数据进行比较，验证了扁平椭圆模型的准确性，并分析了误差的来源。同时在该模型的基础上，研究了料丝直径公差对挤压宽度的影响、扫描速率与进料速率的匹配范围和最大扫描速率。结果 提出了挤压长丝截面的扁平椭圆模型，得到了理论挤压宽度的表达式，并通过实验验证了该截面模型的误差在6%以内，并研究了料丝直径公差对挤压宽度的影响、扫描速率与进料速率的匹配关系，以及PLA材料在不同层高下的最大扫描速率。结论 为提高打印制件品质和效率提供了重要参考。 |
| 英文摘要: |
| Purpose:In the fused deposition molding process, the extrusion width is a neglected core parameter, which not only directly affects the process parameters such as layer height, feed rate, and scanning rate, but also indirectly affects the surface roughness, mechanical properties, dimensional accuracy, and build time of the printed part. Therefore, the extrusion width must be strictly controlled. METHODS:Firstly, a flat elliptical cross-section model is proposed on the basis of 3D printing extrusion principle, viscoelasticity theory and polymer rheology theory. Then the theoretical calculation results of the model are compared with the experimental measurement data to verify the accuracy of the flat ellipse model and analyze the source of the error. Meanwhile, on the basis of the model, the influence of the material filament diameter tolerance on the extrusion width, the matching range of scanning rate and feed rate, and the maximum scanning rate are studied. Results:A flat elliptic model of the extruded filament cross-section is proposed, the expression of the theoretical extrusion width is obtained, and the error of the cross-section model is verified to be within 6% by experiment. The effects of filament diameter tolerance on extrusion width, the matching relationship between scanning rate and feed rate, and the maximum scanning rate of PLA material at different layer heights were also investigated. Conclusion:It provides an important reference for improving the quality and efficiency of printed parts. |
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