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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 趙修武(Shiu-Wu Chau) | |
| dc.contributor.author | Sai-Kiu Wong | en |
| dc.contributor.author | 黃世翹 | zh_TW |
| dc.date.accessioned | 2021-06-17T08:07:25Z | - |
| dc.date.available | 2024-08-20 | |
| dc.date.copyright | 2019-08-20 | |
| dc.date.issued | 2019 | |
| dc.date.submitted | 2019-08-18 | |
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Kobayashi, S.I Oh and T. Altan, Metal Forming and Finite Method, Oxford University Press, pp.170-182, 1989. [37] Michael J. Quinn, Parallel Programming in C with MPI and OpenMP, McGraw-Hill, pp.159-177, 2004. [38] Walsin Lihwa Corporation Yenshui Plant, private communication, June 2018. [39] T.H. Chuang and Walsin Lihwa Corporation Yenshui Plant, Metallography of Stainless Steel Sample and Precipitate Analysis Report, 2019. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73650 | - |
| dc.description.abstract | 本研究主要以有限元素數值模型模擬探討行星式三輥輪高縮減壓延機的熱作過程。基於暫態過程及在剛黏塑性及等密度材料的假設下，進行對S209不銹鋼在熱加工的三維模型有限元素分析。本文利用有限元素套裝軟體 DEFORM 3D分析行星式三輥輪高縮減壓延機在不同條件的加工參數，如鋼胚起始溫度、鋼胚直徑、摩擦係數下，對製程產品的影響。透過觀察壓出成品的外觀特徵與有效應變率、有效應變、有效應力、溫度等物理量，進行分析和探討。從結果得知，鋼胚初始溫度對於壓延成品螺紋影響不顯著，兩端縮孔長度隨溫度降低而縮短；而鋼胚直徑縮短能夠縮短兩端縮孔長度，並讓螺紋間距變寬。從鋼胚物理量徑向分佈得知，有效應力及有效應變率則在壓延材料和輥輪的接觸面達到最高值，在中心處最低。有效應變隨著壓延而累積，在完結加工後達到最大值。溫度分佈方面，鋼胚咬入軋延後，在表皮下5 mm處產生高溫區域，超過S209的熔點溫度1350°C，推測是黑帶破壞處起始點，令材料表面與中心分離。 | zh_TW |
| dc.description.abstract | This research is to study the hot working process in a three rolls planetary high reduction mill (HRM) via a finite element method, where unsteady, three-dimensional model is adopted in the study under the assumption of a rigid-viscoplastic and constant-density workpiece. The commercial software, DEFORM 3D is employed for the numerical simulation of the plastic deformation of hot working process in HRM. Different process parameters, such as temperature, friction coefficient, diameter, are studied for S209 stainless steel in hot working process. Product characteristics and physical quantities, such as effective strain rate, effective strain, effective stress and temperature, are analyzed to identify the influence of processing parameter on the hot working process. The numerical result, indicates that the product characteristics are affected by processing parameters. A lower initial billet temperature results in products with shorter cavity at both ends. A billet with smaller initial diameter leads to products with less significant spiral marks along with shorter cavity at both ends. The effective stress and effective strain rate reach to peak values at the contact surface between the rolls and stay low in the middle part of workpiece. The effective strain grows through the rolling process and achieves the maximum at the end of the process. And a temperature peak is found at 5 mm below the surface of the workpiece, which the peak exceeds the melting point of working material. And it is deduced to be the outset of black zone as well as the material detachment inside the product. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T08:07:25Z (GMT). No. of bitstreams: 1 ntu-108-R06525090-1.pdf: 6989085 bytes, checksum: 861edfd5a9cf2443246190ca01a2c6c5 (MD5) Previous issue date: 2019 | en |
| dc.description.tableofcontents | Chapter 1 Introduction 1
1.1. Overview 1 1.2. Literature Reviews 4 Chapter 2 Mathematical Model 8 2.1 Hypothesis 8 2.2 Governing Equations 9 2.3 Material Properties 11 2.4 Friction Model 15 2.5 Numerical Method 16 Chapter 3 Geometry, Meshing and Boundary Condition 17 3.1 Geometry 17 3.2 Boundary and Operation Condition 19 3.3 Meshing 21 3.4 Mesh Quality 23 Chapter 4 Parallel Performance Analysis 28 4.1 Speedup and Efficiency 28 4.2 Serial Fraction of Parallel Computation 33 Chapter 5 Numerical Results 36 5.1 Case Description 36 5.2 Product Characteristics 37 5.3 Profile of Radial Physical Quantities 50 5.4 Verification and Validation 83 Chapter 6 Conclusion 89 Reference 91 | |
| dc.language.iso | en | |
| dc.subject | 剛黏塑性 | zh_TW |
| dc.subject | 行星式三輥輥壓 | zh_TW |
| dc.subject | 熱壓延 | zh_TW |
| dc.subject | 有限元素法 | zh_TW |
| dc.subject | S209不銹鋼 | zh_TW |
| dc.subject | Rigid-Viscoplastic | en |
| dc.subject | High Reduction Mill | en |
| dc.subject | HRM | en |
| dc.subject | Hot Rolling | en |
| dc.subject | Finite Element Method | en |
| dc.subject | DEFORM 3D | en |
| dc.subject | S209 Stainless Steel | en |
| dc.title | 三維有限元素分析行星式三輥輥壓製程 | zh_TW |
| dc.title | Three-Dimensional Finite Element Analysis of Hot Rolling Process in High Reduction Mill | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 107-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳夏宗(Shia-Chung Chen),王世明(Shih-Ming Wang),莊東漢(Tung-Han Chuang),江茂雄(Mao-Hsiung Chiang) | |
| dc.subject.keyword | 行星式三輥輥壓,熱壓延,有限元素法,S209不銹鋼,剛黏塑性, | zh_TW |
| dc.subject.keyword | High Reduction Mill,HRM,Hot Rolling,Finite Element Method,DEFORM 3D,S209 Stainless Steel,Rigid-Viscoplastic, | en |
| dc.relation.page | 95 | |
| dc.identifier.doi | 10.6342/NTU201903992 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2019-08-19 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 工程科學及海洋工程學研究所 | zh_TW |
| 顯示於系所單位： | 工程科學及海洋工程學系 | |
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