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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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/75041

Title:	粉床熔融成型積層製造回收系統之管路二相流模擬分析
Authors:	蕭宜倫;Xiao, Yi-Lun
Contributors:	機械工程學系
Keywords:	積層製造;金屬粉末;氣送回收;二相流;Additive manufacturing;Metal powder;Pneumatic conveying recycle system;two-phase flow
Date:	2017-07-25
Issue Date:	2017-10-27 16:17:48 (UTC+8)
Publisher:	國立中央大學
Abstract:	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。 ;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.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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