고주파 벤딩을 통한 케이블 파이프의 변형에 관한 연구

Abstract

Induction bending via high-frequency heating is widely used for manufacturing pipe and section steelbends. It allows productivity improvement, unit cost reduction, delivery time compliance, and good mechanicalproperties. The recent increase in high-end vessels and offshore plants has raised the demand forhigh-frequency bending, which should improve the product quality and reduce the costs by simplifying thefabrication process; therefore, the characteristics and performance of this technique must be studied and properdesign technology is required. During hot pipe bending via induction heating, the outward wall thickness ofthe pipe is thinned due to tensile stress and this thickness reduction cannot exceed 12.5%. This study focusedon pipe bends with a bending curvature of 5D and their optimization design; in particular, the conditions thatcan both improve the productivity of the high-frequency bending process and keep the maximum thicknessreduction below 12.5% were determined.