초록 ▼

◦ 엔지니어링 플라스틱 공정 조건별 물성 특성 분석 연구
- PA12 및 글라스비드 보강 PA12 소재 대상 기계적 물성 분석
- 시편 적층 방향 및 온도 조건별로 인장, 굴곡, 충격 시험 실시
- 적층 방향별로 모든 물성에서 뚜렷한 변화 양상을 보이며, 설계시 이방성 물성 고려 필요
◦ 구조 형상별 엔지니어링 플라스틱 제작 특성 분석 연구
- 3D 프린팅 기반 복합 형상 제작시 구조물 내부의 표면 처리 어려움
- 적층 방향 및 내부 배관 형상(사이즈) 별 제품 내벽 표면 조도 측정
- 조건별로

◦ 엔지니어링 플라스틱 공정 조건별 물성 특성 분석 연구
- PA12 및 글라스비드 보강 PA12 소재 대상 기계적 물성 분석
- 시편 적층 방향 및 온도 조건별로 인장, 굴곡, 충격 시험 실시
- 적층 방향별로 모든 물성에서 뚜렷한 변화 양상을 보이며, 설계시 이방성 물성 고려 필요
◦ 구조 형상별 엔지니어링 플라스틱 제작 특성 분석 연구
- 3D 프린팅 기반 복합 형상 제작시 구조물 내부의 표면 처리 어려움
- 적층 방향 및 내부 배관 형상(사이즈) 별 제품 내벽 표면 조도 측정
- 조건별로 내부 표면 조도는 수~십수 마이크로미터 결과를 보이면 이는 유동 영향에 큰 영향을 주지 않으므로, 배관 성형에 문제 없음
◦ 적층기법 적용 주제동 밸브 시스템 설계 기술 개발
- 적층기법으로 주제동 밸브 시스템을 제작하기 위해 곡선형 배관에 대한 유동 효율을 수치적으로 분석하여, 기존 형상보다 유동 효율에서 우수함을 검증함
- 적층 제작을 위한 주제동 밸브 시스템 형상 최적 설계 실시
- SLS기법을 적용한 제품 제작 완료
기존 제품 대비 경량화 효과 60% 이상, 제작 기간 단축 및 제작 공정 일체화 효과

(출처 : 요약서 8p)

Abstract ▼

Ⅱ. Purpose and Needs
Additive manufacturing technology (hereinafter referred to as 3D printing technology) is a core technology that can change the paradigm of the existing manufacturing industry and promote the high added value of the main industry and enhance the competitiveness of the manufact

Ⅱ. Purpose and Needs
Additive manufacturing technology (hereinafter referred to as 3D printing technology) is a core technology that can change the paradigm of the existing manufacturing industry and promote the high added value of the main industry and enhance the competitiveness of the manufacturing enterprise. In the mainstream industries such as aerospace, automobiles, and biomedicine, the use of 3D printing technology for high value-added parts and products is on the rise and is being introduced into the production of mass production. Currently, 3D printing technology has the low price competitiveness when manufacturing the existing products based on the present design methods due to the slow process of materials and expensive equipment. However, manufacturing cost is continuously falling due to the continuous decrease of material price and expansion of equipment infrastructure. In addition, when composites and high-function parts are fabricated through shape design techniques, considering the cost of materials due to the light weight, the reduction of the process, operation and maintenance cost due to the simple processes and the performance improvement, high efficiency of the manufacturing technique can be expected.

However, while the necessity of applying 3D printing technique to parts production is expanding, 3D printing technology has been focused on materials and process technology to date, and domestic manufacturers' understanding and application about advantages and utilization of 3D printing manufacturing technology is insufficient. Therefore, in order to ultimately activate the 3D printing technology and to increase the utilization of 3D printing by the component maker, it is necessary to select a performance-oriented component development concept that can be produced only by the 3D printing technique, and to study a component shape designing method suitable thereto.

Ⅲ. Scope and Contents
1. Analysis of physical properties according to 3D printing process conditions and optimization of process conditions
PBF based 3D printing technology uses material powders and sinters powders by laser. Therefore, various properties of the material properties are shown by laser use conditions and lamination angle. Therefore, basically, the physical properties should be analyzed according to the process conditions, and the final properties of the products to be manufactured can be predicted therefrom. In some cases, in order to realize the optimum performance of the product, the product design plan should be established in consideration of the physical properties according to the process condition, so that the product performance can be maximized. Therefore, this study aims to acquire data on the final properties according to the various process conditions as a basic step for applying 3D printing technology, and to study technology for selecting process conditions according to characteristics of manufactured parts based on the data.

2. Development of analytical-based product optimization technology considering
3D printing process characteristics 3D printing technology is characterized by anisotropic properties, which vary according to process conditions. In addition, it is necessary to consider the process characteristics in the optimum design of the product to suit the process characteristics for smooth fabrication, process time, and cost saving. In this research, aiming at the result of weight reduction, improvement of performance and compactness of the application of 3D printing, aiming at development of optimal design technology that can secure a proper compromise between 3D printing process condition and product performance, This study deals with the design of the main brake valve system. First, based on the analysis, we define the concept of 3D printing process and the design concept that can ensure proper physical properties. Based on this, we develope the main body of brake valve and overall shape design by printing it and performance test.

Ⅴ. Expected Contribution
The product design method using 3D printing derived from this study can be utilized as the core technology for the production of advanced high-tech parts in the railway field. Unlike the existing product design method, the performance priority design is carried out, and as a result, it is possible to make it compast with light weight. In addition, while examples of 3D printing applications in the railway industry have been considered only as alternative manufacturing means to produce the existing product shapes, the concept of products has been newly defined based on the development of this design technology, By approaching the method considering both process and performance, it can be utilized as a technique to obtain the maximum performance while minimizing the process cost. In addition, since the optimal design process for 3D printing technology has been established, it can be used as the core technology for the optimal design in future product development.

(출처 : SUMMARY 13p)

목차 Contents

• 표지 ... 1
• 제 출 문 ... 6
• 보고서 요약서 ... 8
• 요 약 문 ... 10
• SUMMARY ... 13
• Contents ... 16
• 목차 ... 18
• 표목차 ... 19
• 그림목차 ... 20
• 제1장 연구개발과제의 개요 ... 27
• 제1절 연구개발 배경 및 필요성 ... 29
• 제2절 연구개발 목표 및 내용 ... 35
• 제2장 국내외 기술개발 현황 ... 37
• 제1절 3D 프린팅 기술개발 현황 ... 39
• 제3장 연구개발 수행 내용 및 결과 ... 44
• 제1절 3D 프린팅 공정 특성 ... 46
• 제2절 3D 프린팅 제작 엔지니어링 플라스틱 시편 물성 평가 및 분석 ... 129
• 제3절 주제동밸브 특성 ... 150
• 제4절 유로 형상에 따른 압력 변화 해석 결과 분석 ... 160
• 제5절 3D 프린팅 공정특성을 고려한 주제동밸브 메인바디 최적설계 ... 171
• 제6절 EP 소재 3D 프린팅 기술 적용 주제동밸브 메인바디 제작 및 성능 시험 ... 177
• 제7절 결과 ... 181
• 제4장 목표 달성도 및 관련분야에의 기여도 ... 185
• 제1절 목표 달성도 ... 186
• 제2절 관련분야에의 기여도 ... 187
• 제5장 연구개발 결과의 활용 계획 ... 188
• 제1절 연구성과의 활용 계획 ... 189
• 제2절 연구성과의 확산 및 기대효과 ... 189
• 참고문헌 ... 191
• 끝페이지 ... 198