Process for forming and welding closed-end cold-bent section steel

Abstract

The invention relates to a process for forming and welding closed-end cold-bent section steel, belonging to the technical field of the cold bending and forming. The process for forming and welding the closed-end cold-bent section steel comprises the following steps: A, cold bending and forming strip steel, and bending the edge of the strip steel into the arc shape; B, welding the formed strip steel into closed-end cold-bent section steel; and C, reshaping and processing the welded closed-end cold-bent section steel. The process for forming and welding the closed-end cold-bent section steel has the characteristics of high welding stability, reliable welding seam quality and accurate forming size and can be widely used for processing and producing various closed-end cold-bent section steel which is welded under high frequency, particularly the closed-end cold-bent section steel in complex shape.

Description

Technical field [0001] The invention relates to the technical field of cold bending forming, in particular to a forming and welding process of closed cold formed steel. Background technique [0002] Cold roll forming refers to the use of multiple pairs of rollers with specific contours at room temperature to make the metal plate and strip move in a straight line in the longitudinal direction while continuously bending the metal sheet until it is processed into the desired, It is a sheet metal deep processing technology that does not change the thickness of the metal strip during the processing of the profile with a specific cross-sectional shape. Cold forming is also called roll forming. The profile processed by the cold forming process is called cold-formed steel. According to whether the section is closed, cold-formed steel is divided into three different types: open cold-formed steel, semi-closed cold-formed steel and closed cold-formed steel. [0003] At present, there are t...

AI Technical Summary

Problems solved by technology

When the first method is used for forming, the welding process is stable and the welding quality is easy to control, but the forming after welding is "empty bend", and the size and shape of the profile are difficult to control

When the second method is used for forming, because most of the rounded corners are formed by "solid bending", the forming quality is better, the size is easy to control, and it is suitable for forming more complex special-shaped sections; however, unlike round tubes, There are often small-radius circular arcs in the section of the profiled material. These small-radius circular arcs are the weak link of the force. In addition, there is no support inside the cavity, and the anti-deformation ability of the side legs of the profiled material is weak. It is easy to deform, causing the side legs of special-shaped materials to collapse inward, or the material to accumulate toward the fillet, so the welding process is difficult to control, which is a difficult problem in the current production of complex special-shaped sections

Images