粉床熔融成型積層製造回收系統之管路二相流模擬分析

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姓名

蕭宜倫(Yi-Lun Xiao) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

粉床熔融成型積層製造回收系統之管路二相流模擬分析

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摘要(中)

本研究主要目標為發展粉床熔融成型積層製造中金屬粉末氣送回收系統，此回收系統是利用氣體輸送技術進行粉末回收。此回收系統不但可以改善粉末的浪費，更可將回收的粉末回送至雷射燒結的供料區，進而讓雷射燒結製程可以長時間持續運轉，更有利去發展製作大尺寸的物件，例如航空等級零組件等。
本研究使用COMSOL Multiphysics進行模擬分析，利用雙向耦合之Eulerian-Lagrangian方法來模擬粉床熔融成型積層製造回收系統之二相流影響，探討不同的曲率半徑對其氣體流場與顆粒運動對系統的影響，針對在氣送過程中繩索現象、金屬粉末與管壁的損害，以及金屬粉末在管路內的沉積等問題。並針對粉末供應系統進行進氣系統之幾何外型設計，模擬結果可知，改善設計之進氣系統可以改善粉末沉積對粉末輸送造成的不均勻性。

摘要(英)

The main purpose of this study is to establish a metal-powder recycles system for the Powder Bed Fusion. The recycle system uses pneumatic conveying system for powder recovery. The recycle system decreased metal-powder waste. Overflow powder from the laser sintering machine is recovered and recycled back into the laser sintering machine for reuse. And laser sintering machine can operate for a long time, be more conducive to the development of large-scale production of objects, such as aviation part, equipment, etc.
The mechanism of the pneumatic conveying in a curved pipe with different geometric shapes is numerically procedure by using COMSOL Multiphysics in this study. The air flow field and the particle′s motion in the pipe are considered. The gas-solid flow is solved by employing two-way coupled Eulerian-Lagrangian approach. The particle rope, powder deposition and bend erosion due to the collision of metal-powder and wall is also analyzed. Then, design the gas inlet system, the simulation results indicate that improving the design of the gas inlet system will improve the non-uniformity of powder delivery caused by powder deposition.

關鍵字(中)

★ 積層製造
★ 金屬粉末
★ 氣送回收
★ 二相流

關鍵字(英)

★ Additive manufacturing
★ Metal powder
★ Pneumatic conveying recycle system
★ two-phase flow

論文目次

摘要 I
Abstract II
誌謝 III
目錄 IV
附圖目錄 VII
附表目錄 X
符號說明 XI
第一章緒論 1
1.1 前言 1
1.2 積層製造技術發展 2
1.3 金屬積層製造 4
1.4 金屬粉末 5
1.5 粉末處理與回收技術 7
1.6 氣送技術研究發展 10
1.7 研究動機與論文架構 14
第二章基礎理論與數值模擬 26
2.1 有限元素法 27
2.2 流體運動理論 28
2.2.1 管路內的二次流現象 28
2.2.2 統御方程式 29
2.2.3 紊流模式 31
2.2.4 紊流邊界層處理 33
2.3 顆粒運動理論 33
2.3.1 流體粒子追蹤 33
2.3.2 粒子追蹤模組 34
2.4 流體與顆粒之間的耦合 36
2.4.1流體與顆粒相互作用 36
2.4.2 牆壁與顆粒相互作用 37
2.5 損耗模型(Erosion Model) 38
2.5.1 Finnie Erosion Model 39
2.5.2 E/CRC Erosion Model 40
2.5.3 Oka Erosion Model 40
2.5.4 DNV Erosion Model 41
2.6 粉床熔融成型積層製造氣送回收系統 41
2.7 模擬幾何與參數 44
2.8 假設與邊界條件 45
2.8.1 假設條件 45
2.8.2 邊界條件 45
2.9 網格獨立分析 46
第三章結果與討論 56
3.1 粉床熔融成型積層製造回收系統的流動現象 57
3.1.1 回收系統中在不同R/D比下對氣體流動現象的影響 57
3.1.2 回收系統中的粒子軌跡和損耗分佈在不同的R/D比下對顆粒運動的影響 61
3.2 加入進氣設計至回收系統 64
3.2.1 不同進氣設計之影響與探討 65
3.2.2 加入Venturi Powder Ejector進氣設計於回收系統中之影響與探討 65
第四章結論 90
參考文獻 93

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指導教授

蕭述三

審核日期

2017-7-25

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