空調壓縮機三點銲接之熱傳與應力分析

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姓名

羅元彰(Yuan-Zhang Luo) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

空調壓縮機三點銲接之熱傳與應力分析
(Thermal and Mechanical Analysis of Three-Point Welding in Air-Conditioning Compressor Assembly)

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摘要(中)

本研究利用有限元素法建立一套應用於家用空調迴轉式壓縮機幫浦缸
體與外殼組裝三點銲接之電腦輔助工程分析技術。首先利用三點順序銲接
建立一套模擬三點銲接之有限元素分析模型，並透過實驗驗證模擬分析結
果，確認該有限元素分析模型的有效性。之後，再將該模型進一步應用於三
點同步銲接，預測相關零件的溫度分佈、殘留應力及變形。最主要觀察的部
分為葉片槽的變形及幫浦在銲接後真圓度的改變。
有限元素分析模型計算求得三點
順序銲接溫度分布，與實驗量測結果
比對，不管在溫度變化趨勢或是數值都相當吻合，因此確認有限元素分析模
型的有效性。藉由此三點順序銲接模擬手法，應用於三點同步銲接分析，計
算結果發現於三點同步銲接過程，最大 von Mises 等效應力主要存在於銲料
區外側，隨著銲接過程結束，進入冷卻，最大等效應力區域逐漸移至熱影響
區，最終，熱影響區殘留應力值會超過所使用材料降伏強度值，因此，此區
域預期可能會發生塑性變形。同時從位移的模擬結果中，可以看出缸體的真
圓度並未改變，因其節點位移並無太大變化，此乃這些區域並無太大溫度梯
度所致。而葉片槽在冷卻後，其槽寬的尺寸略有變化，但仍在可接受的範圍
內。

摘要(英)

F
inite element method (FEM) is applied to de veloping a computer aided engineering
CAE) technique for simulating the weld ing process in assembly of a household air
conditioning rotary compressor. An FEM model in simulation of joining pump cylinder and
outer shell is established first for sequential three point welding, and the simulation results are
compared with experiments to verify the FEM modeling. The validated FEM modeling is then
applied to simulating simultaneous three point welding to predict temperature distribution,
residual st ress , and deformation in related parts. In particular , deformation of the vane slot and
the change of roundness of the pump after welding are investigated
FEM simulations and experiments show good agreement in temperature distribution in the
sequential th ree point welding of pump cylinder and outer shell. The constructed FEM model
is thus proved to be effective in analysis of three point welding. The three point welding
simulation technique is then applied to the simultaneous three point welding process . T he
calculation results show that during the simultaneous three point welding, the maximum von
Mises equivalent stress mainly exists outside the weld zone. When the welding process is
completed and the cooling process begins, the maximum von Mises equivalen t stress region
gradually moves to the heat affected zone ( HAZ )). The residual stress in the HAZ exceeds the
yield strength . Therefore, plastic deformation might take place in the core region of HAZ At
the same time, the simulation results of deformation s how that the roundness of the cylinder
has not changed, because the node displacement does not change much This is because the
temperature gradient is quite small in these regions which are far away from the welding zones
A lthough a slight change in the vane slot width is found after welding, it is still in the acceptable
range.

關鍵字(中)

★ 壓縮機
★ 三點銲接

關鍵字(英)

論文目次

LIST OF TABLES ................................................................................................................... VI
LIST OF FIGURE ...................................................................................................................VII
1. INTRODUCTION .............................................................................................................. 1
1.1. Components in Rotary Compressor for Household Air Conditioning ....................... 1
1.2. Welding Methods ....................................................................................................... 5
1.3. Temperature and Residual Stress Fields in Welding .................................................. 8
1.4. Purpose ..................................................................................................................... 18
2. NUMERICAL SIMULATION ........................................................................................ 20
2.1. Thermal and Structural Theories in Simulation of Three-Point Welding ................ 20
2.2. Finite Element Model ............................................................................................... 24
2.3. Material Properties ................................................................................................... 25
2.4. Heat Source and Boundary Conditions .................................................................... 30
2.5. Element Birth-and-Death Technique ........................................................................ 33
3. EXPERIMENT ................................................................................................................. 34
3.1. Experimental Setup .................................................................................................. 34
3.2. Experimental Procedures .......................................................................................... 37
4. RESULTS AND DISCUSSION ....................................................................................... 39
4.1. Sequential Three-Point Welding of Cylinder Assembly and Outer Shell ................ 39
4.1.1. Simulation results ......................................................................................... 39
4.1.2. Experimental results ..................................................................................... 49
4.1.3. Comparison of simulation and experimental results .................................... 53
4.2. Simultaneous Three-Point Welding of Cylinder Assembly and Outer Shell ........... 58
4.2.1. Temperature distribution .............................................................................. 58
V
4.2.2. Stress distribution ......................................................................................... 63
4.2.3. Deformation in the cylinder .......................................................................... 68
5. CONCLUSIONS .............................................................................................................. 72

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指導教授

林志光

審核日期

2019-8-20

推文