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系統識別號 U0026-1508201811552300
論文名稱(中文) 選擇性雷射熔融之雙道掃描參數最佳化模擬分析
論文名稱(英文) Optimization in Process Parameters on Double Track of Selective Laser Melting
校院名稱 成功大學
系所名稱(中) 機械工程學系
系所名稱(英) Department of Mechanical Engineering
學年度 106
學期 2
出版年 107
研究生(中文) 劉邦佑
研究生(英文) Bung-Yo Liu
學號 N16051215
學位類別 碩士
語文別 英文
論文頁數 65頁
口試委員 指導教授-羅裕龍
口試委員-黃聖杰
口試委員-王覺寬
中文關鍵字 積層製造  選擇性雷射熔融  代理模型  人工神經網路  參數最佳化 
英文關鍵字 Additive Manufacture  Selective Laser Melting  Surrogate Modeling  Artificial Neural Network  Parameters Optimization 
學科別分類
中文摘要 積層製造技術如選擇性雷射熔融相較於傳統製造方式具有許多優勢。選擇性雷射熔融能夠在短時間內產生獨特的部件,並且幾乎不受幾何形狀的限制。選擇性雷射熔融中的參數如雷射功率,掃描速度,粉末層厚度,掃描路徑間距和掃描長度之間具有複雜的相互作用並影響產品的品質。尋找可以生產高品質產品的最佳參數對於製造者一直是十分重要的問題。基於先前對最佳雷射功率和掃描速度的研究,本研究調查了掃描路徑間距和掃描長度的影響。提出了一種模擬參數設計方法,並建立了三維有限元素模型來模擬掃描軌跡的特徵。人工神經網絡(ANNs)運用於預測模擬結果。最終,基於熔池的最高溫度,熔池深度差異和兩個掃描軌道的重疊率確定最佳參數。當雷射光斑直徑為120微米且雷射功率為180W,雷射掃描速度為680 mm/s,粉末層厚度為40微米時,建議的雷射掃描間距為雷射光斑大小的73%。
英文摘要 Additive manufacture (AM) such as selective laser melting (SLM) has many advantages over traditional manufacture techniques. Selective laser melting is able to produce unique parts in a short time and has nearly no restriction on geometry. The parameters in selective laser melting such as laser power, scanning speed, powder layer thickness, hatch spacing and scan length have complex interactions with each other and affect the quality of the product. Determining the optimal parameters for producing the high-quality product has been an important issue for manufacturers. Based on the previous research of optimal laser power and scanning speed, this research investigates the influence of hatch spacing and scan length. A sphere packing design method was proposed to design the parameters for simulation and a three-dimensional finite element model was constructed to simulate the features of scan tracks. Artificial neural networks (ANNs) were used to predict simulation results. Finally, optimal parameters were determined based on peak temperature, difference in depth of melt pools, and overlap rate of two scan tracks. As a result, the hatch space is recommended as 73% of laser spot size in this study if the diameter of laser spot is 120μm, laser power is 180W, scanning speed is 680mm/s, and powder layer thickness is 40μm.
論文目次 Abstract I
中文摘要 III
致謝 IV
Table of Contents V
List of Tables VII
List of Figure VIII
Chapter 1 Introduction 1
1.1 Preface 1
1.2 Research motivation and purposes 2
Chapter 2 Theory and Method 5
2.1 Heat source simulation 5
2.2 Sampling Method 6
2.3 Simulation on Heat source and Heat transfer 10
2.4 Material Properties of Stainless Steel 316L Powder 13
Chapter 3 Double Track Simulation of SLM process 17
3.1 Basics of finite element model 17
3.2 Simulation Results 23
Chapter 4 Optimization of SLM Parameters 26
4.1 Surrogate Modelling 26
4.2 Criterion in Peak Temperature 28
4.3 Criterion in Difference of melt pool depths between adjacent tracks 30
4.4 Criterion in Overlap Rate 33
Chapter 5 Experiment and Simulation validation 40
5.1 Selective Laser Melting machine 40
5.2 Experimental Setup for Verifying the Two-track Modelling 42
5.3 Experimental Setup for Verifying the Optimization Zone 48
5.3.1 3mm × 3mm surface scanning experiment 48
5.3.2 5mm × 5mm surface scanning experiment 54
5.3.3 Experimental results and discussion 59
Chapter 6 Conclusions and Future Works 61
Reference 63
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