| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of producing an annular body in which butted edge faces (cut faces) are made parallel when blank materials are subjected to roll forming and are butted without performing bend working. <P>SOLUTION: From a rolled steel sheet 1 rounded so as to be a roll shape, the rolled steel sheet is pulled out and is cut into prescribed dimensions to form blank materials 2. At this time, the cut face 2a is made gradient by 1 to 3°based on the thickness direction of the blank material 2. Further, the gradient directions of the cut faces 2a in both edges are made reverse. The blank materials 2 cut in this way are subjected to roll forming, and the cut faces 2a in both edges are butted. The cut faces 2a in both edges are butted so as to be made parallel since the cut faces 2a are gradient by 1 to 3°in the opposite directions. Then, the butted parts are subjected to laser welding to obtain a cylindrical body 3. <P>COPYRIGHT: (C)2004,JPO</p> |
