DEVICE AND METHOD FOR PRODUCING CLOSED-CROSS-SECTION-STRUCTURE COMPONENT HAVING CURVED SHAPE

摘要

The present invention provides a device and method for producing, from two metal plates, a closed-cross-section-structure component having a deformed cross-sectional shape having a welded section and a bend in the direction of component length. In conventional techniques, it is not possible to simultaneously proceed with bending and cross-section deformation. The present invention can simultaneously proceed with bending and cross-section deformation. Two metal sheets (1a, 1b) that are provided with a sheet-length-direction bend corresponding to a component (10) length-direction bend and that have both sheet width edges matched at a flange section (13) are press-molded in a manner so that creases (2) are imparted to sheet sections corresponding to a non-welded bent section (12) and a welded section (11) within the component cross section, then are overlapped vertically in a manner so that the protruding surface sides thereof are at the outside and the creases of flange-section-corresponding sites facing each other vertically at the left and right edges of the width thereof are welded in the lengthwise direction thereof, forming the welded section (11), and while guiding and conveying the obtained closed-cross-section structure (5) by means of a left-right pair of rotating rollers (40a, 40b) or furthermore by a lower rotating roller (40c), with the creases and the welded sections as starting points, the closed-cross-section structure is caused to become 3D and forms a component having a target shape by means of altering the inter-roller gap of the rotating rollers or by furthermore raising/lowering the rotating roller.