METHOD OF STRAIGHTENING TROUGH-SHAPED ARTICLE Russian patent published in 2018 - IPC B21D1/10 

FIELD: machine building.

SUBSTANCE: invention relates to machine building, including the process of straightening an article after welding processes. When straightening a trough-shaped article with a large base and a flange located above the walls of the trough-shaped article, by pressing the curved surface of the flange, straightening is performed using a tool including a jack with grippers fixed on it, realising a three-point straightening procedure, and a metal ruler. Metal ruler is placed on the surface of the flange, and the grippers of the tool are fixed to the flange from the inside of the trough-shaped article perpendicular to the surface of the flange and the jack is pressed until the flange achieves the required size in the plane of the flange, then pressure is removed, and the tool is removed. Further, the metal ruler is placed on the surface of the flange where one of the grippers has been fixed before, the tool is then reinforced and the previous action is repeated, bypassing the perimeter of the flange of the trough-shaped article, until its shape achieves the required dimensions in the plane of the flange. Jack used can be a portable hydraulic cylinder.

EFFECT: improving the quality of the article by preventing warpage.

1 cl, 1 dwg