ROLL FOR MOLDING SQUARE TUBE AND METHOD AND DEVICE FOR ROLLINGLY MOLDING SQUARE TUBE

摘要

This invention has the purpose of manufacturing with multi-use rolls and at low cost square tubes having highly accurate shape and dimensions and excellent internal quality by roll forming a round tube to a square tube without applying excessive load to the raw tube scheduled portions to become corner portions and shoulder portions. This invention structures the curvature of the rotation axis direction of the formation roll surface in a way that in relation to other raw tube locations (other side portion scheduled locations) straightening precedes for the raw tube locations (shoulder portion scheduled locations) adjacent to the corner portion scheduled locations of the square tube, it disposes stands of four-direction roll structure at the formation roll stand furthest upstream and furthest downstream sides and disposes stands of upper-lower and left-right two-direction roll structure between the upstream and downstream roll stands, and by adopting formation roll with a structure having a curvature for constricting the raw tube locations to become the shoulder portions adjacent to the corner portions of the square tube at a smaller curvature than that constricting the raw tube portions to become the side portion centers of the square tube cross section, enables an optimum balance for roll multi-use effect and equipment costs, and allows manufacturing of superior quality square tubes with multi-use implementation of rolls and at lower cost.