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高 重量 平블록 壓縮荷重 支持臺 핀지그 解析에 關한 硏究

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Author(s)
김미애
Issued Date
2006
Abstract
These days, the need of welding time shortening has been increasing because of decrease of experienced welders, ageing of welders, high wage, regularity of welded parts, and large-sized pipe welding. More pipes are being demanded in the naval structures, pipes, iron tower and design, and high productivity and precision are required to produce them.
As the condition of the world ship-building market has been recovered, Korean ship-building business is also believed to have been mature. In the 21st century, it is expected that our ship-building business will rely on export though the domestic demand is increasing. Therefore, the ability of ship-building will improve more.
As ship-building business needs cooperation of laborers in various fields, they are exposed to various harmful elements, have to work outside like construction fields as well as inside like processing plants, have to move frequently for work and the work is much affected by weather or climate.
Small and medium-sized business and machine and processing business are having double pressure of cost because of increased labor costs and technological gap with advanced countries and they recognize that the most effective strategy to resolve the problem is the development of technology. To reinforce competitive power of national ship-building companies, technologies should be greatly improved. However, according to the survey targeting ship-building companies, their technologies are far behind those of advanced countries in development of new products and application of new technologies.
Therefore, as a plan to complement lack of professional personnels and to decrease the unit cost of production, they are trying to decrease welding processing and produce all-in-one parts to increase the unit cost and efficiency of the work. In particular, as compress loading support system used for ship blocks have many cracks, it is urgent to develop tensile materials. And to produce high-quality casting products, the reasons of defects should be analysed, and a theoretical analysis on physical phenomena occurring in the process of casting is needed. Through the analysis on the reasons of defects, it is expected that defects occurring in the process of casting process can be predicted, the design of cast may be changed, other processing variables can be controlled to produce high-quality products, and they can be used to produce high-quality and super precision support facility for the ship building .
This study presented a casting-method using spheroidal graphite cast iron, and conducted a computer simulation of design principle for die design and processing analysis. In the casting analysis, fluid velocity control at sprue and gate was required to improve quality of casting and casting speed and solidification were analysed in terms of thermal and flow analysis. Based on the result of the analysis, this study produced plane-block pieces for compress load support plate bock pin jig and conducted a reliability test of produced parts. And it predicted all the phenomena caused by flow and coagulation in casting processes to develop the pieces and improve processing to maximize its production and quality through optimization in design of casting.
From these test, we reached conclusion as followings ;
1. As the results of the analysis of the plate support pin jig design and modeling, it was designed stable pieces to support more than 400ton, and developed the plate bock support system of toughness ductile cast iron through casting processing after metal mold design.
2. Based on the results of the compressive load support analysis model, it investigated variables that can influence casting processes, and confirmed that they had a great influence on air down, molten metal flow and solidification in respect to casting speed and solidification process.
3. It was founded that metal mold temperature is 1280℃-1300℃ from the results of optimization casting conditions for real casting. And it found that fast coagulation began after 40% of coagulation finished after filling, and the temperature was 900℃-1100℃. Below 900℃, the temperature was maintained for a certain period at the center of parts, which contributed to thermal stability and stability structure of ductile cast iron.
4. As a results of the filling analysis, it was predicted that the possibility of defects is founded due to bad filling and miss-run at the filling time through a computer analysis. And as a result of the flow speed vector analysis, it was confirmed that air hole appeared at the bottom of the piece due to gas and resolved by the size variation of in-gate.
5. As a results of observed the pictures of the ductile cast iron structure about the compressed loading, it was obtained the maximum value of about Hb 220 through the study on ductile cast iron materials. the mechanical properties are measured as tensile strength 530.7N/㎠, yield strength 388.9 N/㎠ and elongation 13%.
6. It was judged as important task a plan to reduce the expense of processing to balance the produced piece of plate block pin jig. as much expense is needed for drilling of piece holes, it should also be resolved.
If the analysis of casting process is introduced through computer simulation, production steps of support facility parts for the ship-building can be simplified and time and expense can be also saved. And, the reason of defects should be analysed to produce high-quality casting products and a theoretical analysis on physical phenomena occurring in the casting processing is needed.
Therefore, this study suggests that we need further studies on decrease of unit cost of production through preparation of computer-analysed casting plans, and development of ship facility parts in respect to the production of ships is our urgent task as China has become more competitive in ship-building business.
Alternative Title
A Study on the Pin Jig Analysis of Compressive Load Support System in the Supper Load Plate Block
Alternative Author(s)
Kim, Mi-Ae
Affiliation
조선대학교 대학원
Department
일반대학원 기계공학과
Advisor
차용훈
Awarded Date
2007-02
Table Of Contents
List of figures = Ⅰ
List of tables = Ⅲ
List of photographs = Ⅳ
Nomenclatures = Ⅴ
Abstract = Ⅷ
제 1장 서론 = 1
1.1 연구배경 및 목적 = 1
1.2 연구방법 = 4
제 2 장 관련이론 = 5
2.1 주조관련 이론 = 5
2.2 탕구계의 설계 = 10
2.3 열전달 미분방정식 = 13
2.4 유동해석 지배방정식 = 16
2.5 VOF 법 = 19
제 3 장 실험 = 20
3.1 재료 및 시험편 = 20
3.2 평블록 핀지그 설계 = 24
3.3 핀지그 모델링 및 압축하중 분석 = 35
3.4 주조방안 및 해석 = 37
제 4 장 결과 및 고찰 = 44
4.1 유동해석 결과 = 44
4.2 유동속도벡터 해석 결과 = 51
4.3 응고 온도분포 = 55
4.4 조직사진 관찰 및 경도시험 = 62
제 5 장 결론 = 68
REFERENCES = 70
Degree
Master
Publisher
조선대학교 대학원
Citation
김미애. (2006). 高 重量 平블록 壓縮荷重 支持臺 핀지그 解析에 關한 硏究.
Type
Dissertation
URI
https://oak.chosun.ac.kr/handle/2020.oak/6539
http://chosun.dcollection.net/common/orgView/200000233920
Appears in Collections:
General Graduate School > 3. Theses(Master)
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