무금형 다점 펀치와 분활성형을 적용한 선체 외판의 가공 정보 시스템 개발에 관한 연구

초록

Forming process of curved plate has been carried out by skilled workers with line heating method. In this study, as more efficient method for the process, Press forming machine composed of a pair of reconfigurable multi press dies is used for forming hull plates of marine vessels. In addition to using the equipment efficiently, continuous division press forming method is applied. However it is difficult to estimate the amount of accurate spring back after forming the plate, we present a combination of FEM (Finite Element Method) and compensation algorithm concerning the relevant numerical approaches. In order to calculate the spring back, the process is modeled by an elastic plastic material and shell elements. An iterative process to obtain the compensated pressing strokes is suggested to adjust the amount of pressing through FEM and geometric compensation. The shape deviations due to spring back are compensated using DA(displacement adjustment) method. Typical examples show the applicability of the method. Key Words : curved plate, forming process, continuous division forming, Spring Back, Displacement Adjustment, Multi Point Press Forming