| 摘要 |
PURPOSE:To improve the shape accuracy of a cut-off end face by partially bringing a notched part of a stock to be a thicker-walled part than other parts, notching deeply and to be imperfectly cut off the above thick part, and largely elongating the notched part than other parts and completely separating the thick part. CONSTITUTION:A rough stock (a) is formed into a rolled stock having a Z- shaped section by a rough rolling pass (c). Then, a reciprocative or one pass rolling of a universal edgers (d),(e) bring a sheet thickness of a part corrresponding to a part to be notched thicker than that of other parts. The thick-walled part of a rolled stock obtained by the above method is notched so that the P point is taken as a symmetrical axis by a notching pass (f), Then, the rolled stock is naturally separated by spreading effect of the stock caused by larger elongation of adjacent parts of the notched part than that of other parts by flatting a part corresponding to a web part as usual rolling by a rolling pass (g) by use of double grooved rolls. Next, separated web end faces are corrected by a finishing rolling (i). |
