Method for manufacturing frame parts formed by roll forming and frame parts formed by roll forming

Abstract

This invention provides a frame component formed by roll forming, which enables the productive manufacture of highly rigid frame components having multiple closed cross-sections, and also allows for the suppression of springback using a simple method, thereby improving welding accuracy, as well as a method for manufacturing the same. [Solution] The process includes a cutting step S1 for cutting a metal plate, a forming step S2 for forming a frame component having a long hollow body with at least two continuous closed cross-sections by roll forming, a temporary joining step S3 for performing a temporary joining process, a waiting step S4 for keeping the frame component awaited, and a final joining step S5 for welding the frame component. The temporary joining process is a joining process that holds overlapping plate materials in a close-contact state. In the final joining step S5, one end of the plate material or another end is continuously welded to the closed cross-section plate material along the longitudinal direction of the long hollow body. While the frame component is being formed in the forming step S2, the welding in the final joining step S5 is performed on the other frame component.

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