On the Study of Automatic Plate Bending

Research Project

Project/Area Number	61850077
Research Category	Grant-in-Aid for Developmental Scientific Research
Allocation Type	Single-year Grants
Research Field	船舶構造・建造
Research Institution	The University of Tokyo
Principal Investigator	NOMOTO Toshiharu Professor, Faculty of Engineering, University of Tokyo, 工学部, 教授 (80011170)
Co-Investigator(Kenkyū-buntansha)	TOMITA Yasumitsu Associate Professor, Faculty of Engineering, Osaka University, 工学部, 助教授 (30029251) TSUJI Isamu Professor, Faculty of engineering, Kyusyuu University, 工学部, 教授 (80037697) ENOSAWA Makoto Assistant, Faculty of Engineering, University of Tokyo, 工学部, 助手 (40011077) OHTSUKA Morizou Assistant, Faculty of Engineering, University of Tokyo, 工学部, 助手 (30010896) 大野伊佐男住友重機械工業, 追浜造船所, 本部長 OHNO Isao Director, Sumitomo Heavy Industry Ltd. 大野伊左男住友重機械工業, 追浜造船所船舶海洋, 研究開発研究員浦環東京大学, 生産技術研究所, 助教授 (60111564)
Project Period (FY)	1986 – 1988
Project Status	Completed (Fiscal Year 1988)
Budget Amount *help	¥14,200,000 (Direct Cost: ¥14,200,000) Fiscal Year 1988: ¥1,900,000 (Direct Cost: ¥1,900,000) Fiscal Year 1987: ¥2,700,000 (Direct Cost: ¥2,700,000) Fiscal Year 1986: ¥9,600,000 (Direct Cost: ¥9,600,000)
Keywords	plate bending / automatic plate bending facility / shipbuilding / 有限要素法 / 板曲げ実験 / 線状加熱法 / 厚板曲げ / 自動板曲げ / スプリングバック / 加工設定曲面 / 自動曲げ / 船体外板 / 二重曲率 / 座屈変形
Research Abstract	It is often said that the main characteristics in shipbuilding industry are ship is composed of a large size of welded structures and also her structure, especially at fore and aft parts, is composed of free curved surfaces. Therefore plate bending is one of the most important techinique in ship production stage. Thus far line heating method is employed to bend a plate which has double curvatures. In order to make automated shipyard, however, plate bending process is the most complicated one. In shipbuilding industry, the development of automatic plagte bending facility has long been a dream. However, there were few study in the world In this paper, (1) A prototype of automatic plate bending facility is developed, in which 6x6 pistons are used (total load 20 ton). (2) In order to know the capability of the facility, more than a hundred of steel plates are tested. (3) To know the relation between design shape of face and set-in shape of plate, a calculation program called NCBEND based on finite element method is developed. By using the program NCBEND, a finite deformation problem of plate bending in the elastic-plastic stated can easily be calculated. (4) Comparing test results and calculated ones, a estimation method of set-in shape of surface is generally established.