무금형 다점 펀치를 사용한 선체외판의 분할 성형 가공 정보 계산 시스템 개발
Mechanical Bending Process and Application for a Large Curved Shell Plate by Multiple Point Press Machine
0
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
As a forming method for curved hull plates more efficient than the flame bending, mechanical bending using multi point press forming and die-less forming is discussed in this paper. the mechanical forming is a flexible manufacturing system for automatically forming of hull parts. It is especially suited to varied curved parts. This paper discusses a multiple point pressing machine composed of a pair of reconfigurable punches in order to achieve the rapid forming of curved hull plates using division forming and presents how forming information is obtained from the given design surface. Although the mechanical forming can be efficient in the metal forming, spring back after pressing is a phenomenon which must be carefully considered when quantifying the process variables. If the spring back is not accurately controlled, the fabricated shell plate cannot meet assembly tolerance. This paper describes the principles to calculate the proper stroke of each punch at the divided areas. the strokes are determined by an iterative process of sequential pressing and spring back compensation from an unfolded flat shape to its given design surface. FEA(finite element analysis) is used to simulate the spring back of the plate and the IDA(iterative displacement adjustment) method adjusts the offset of pressing punches from the deformation results and the design surface. The shape deviations of two surfaces due to spring back are compensated by integrated system using FEA and IDA method. For the practical application, It is aimed to develop an integrated system that can automatically perform the compensation process and calculate strokes of punches of the double sides’reconfigurable multiple-press machine and some experimental results obtained with mechanical bending are presented.
Abstract
As a forming method for curved hull plates more efficient than the flame bending, mechanical bending using multi point press forming and die-less forming is discussed in this paper. the mechanical forming is a flexible manufacturing system for automatically forming of hull parts. It is especially suited to varied curved parts. This paper discusses a multiple point pressing machine composed of a pair of reconfigurable punches in order to achieve the rapid forming of curved hull plates using division forming and presents how forming information is obtained from the given design surface. Although the mechanical forming can be efficient in the metal forming, spring back after pressing is a phenomenon which must be carefully considered when quantifying the process variables. If the spring back is not accurately controlled, the fabricated shell plate cannot meet assembly tolerance. This paper describes the principles to calculate the proper stroke of each punch at the divided areas. the strokes are determined by an iterative process of sequential pressing and spring back compensation from an unfolded flat shape to its given design surface. FEA(finite element analysis) is used to simulate the spring back of the plate and the IDA(iterative displacement adjustment) method adjusts the offset of pressing punches from the deformation results and the design surface. The shape deviations of two surfaces due to spring back are compensated by integrated system using FEA and IDA method. For the practical application, It is aimed to develop an integrated system that can automatically perform the compensation process and calculate strokes of punches of the double sides’reconfigurable multiple-press machine and some experimental results obtained with mechanical bending are presented.
참고문헌 (16)
- ANSYS, "Theory Manual" (2007), ANSYS Co. Ltd
- Besl, P.J, "A Method for Registration of 3-D Shapes", IEEE Transactions on Pattern Analysis and Machine Intelligence, 14(2), pp.239~256 (1992)
- Horn, B.K.P, "Closed-form Solution of Absolute Orientation Using Unit Quarternions", Journal of Optical Society of America, 4(4), pp.629~642 (1987)
- Hwang, S.Y, "Springback adjustment for multi-point forming of thick plates in shipbuilding", COMPUTER-AIDED DESIGN, 42(11), pp.1001~1012 (2010), ELSEVIER SCI LTD
- Hwang, S.Y, "Localization between Curved Shell Plate and Its Unfolded Shape in Different Coordinate Systems for Ship-Hull Plate Forming", MATHEMATICAL PROBLEMS IN ENGINEERING (2011), GORDON BREACH PUBLISHING
- Ishiyama, M, "An automatic system for line heating bending processing method utilizing FEM application", Proceedings of 10th International Conference on Computer Applications in Shipbuilding, 통권 : 2, pp.419~435 (1999)
- Kang, J.G, "Numerical analysis of induction heating for the application of line heating", Journal of the Society of Naval Architects of Korea, 37(3), pp.110~121 (2000)
- 이장현, "유한요소해석과 다변수해석에 의한 선상가열 변형관계식", 대한조선학회 논문집, 39(2), pp.9~80 (2002), 대한조선학회
- Li, M.Z, "Multi-point forming technology for sheet metal", Journal of Material Processing Technology, 129(1), pp.333~338 (2002)
- Nomoto, T, "Development of simulator for plate bending by line-heating", Journal of the Society of Naval Architects of Japan, 168(2), pp.527~535 (1990)
- 박정서, "굽힘 변형도를 이용한 선상가열 과정의 곡 펴짐 현상에 관한 연구", 대한조선학회 논문집, 45(4), pp.417~425 (2008), 대한조선학회
- Shin, J.G., "An object oriented control system for an automated line heating process", Proceedings of 10th International Conference on Computer Applications in Shipbuilding, 통권 : 2, pp.399~408 (1999)
- Shin, J.G, "User-friendly, advanced line heating automation for accurate plate forming", Journal of Ship Production, 19(1), pp.8~15 (2003)
- Ueda, Y, "Development of computer aided process for plate bending by line-heating (3rd report) relation between heating condition and deformations", Journal of the Society of Naval Architects of Japan, 173, pp.409~418 (1993)
- 이박인, "열간가공에 의한 강판의 곡 가공 자동화 시스템", 대한조선학회 논문집, 39(2), pp.5~44 (2002), 대한조선학회
- 윤종성, "다점 프레스를 이용한 곡면 성형의 가공 정보 산출을 위한 IDA 방법", 한국해양공학회지, 22(6), pp.75~82 (2008), 한국해양공학회