A METHOD FOR PRODUCING ROTATIONAL-SYMMETRICAL ARTICLES OF SHEET METAL WITH DOUBLE CURVED SURFACE AND VARYING THICKNESS OF MATERIAL

摘要

The present invention relates to for producing sheet metal rotational symmetry article, the article has the thickness of double-curved surface and variation, especially such as rocket nozzle, wherein the part blank of muti-piece sheet metal is cut into partial circle shape shape under formation state, and thus the sheet metal is to bend to desired curvature and weld together to form the final machining of green article. Sheet metal of the invention is welded together to form the relationship by many strip metal plate piece materials with different thickness in the state of smooth along its straight flange side by side, correspond to the material of entire product and the thickness gradually reduced the plate repeatedly to form one piece of sheet metal widths, the shape width that wherein plate is cut into nozzle is equivalent to the tubular shape with part circular, the nozzle width, which is equivalent to, to be then bent over, and the sheet metal welds together them along its neighbouring not parallel straight mistake, the blank of finished article, the blank is finally susceptible to finish, if necessary.