| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a pipe, which is provided with a drawn part from the outer peripheral surface of the inner part of a bent portion, by which the miniaturization of a retractor is achieved without incurring increase in manufacturing cost. <P>SOLUTION: In this method, a member 40 the top part of which is provided with the projecting part 42 for forming the drawn part which is conformed to the shape of the drawn part S is used, bending forming is performed by making the other end part of a pipe base stock P" be arcuately bent so that the projecting part 42 for forming the drawn part is brought into contact with the outer peripheral surface on the side of the inner part on the side of one end than a region to be a bent portion Q of the pipe base stock P" which is extended like a straight line and, after the bending forming is progressed and the projecting part 42 for forming the drawn part is brought into contact with the outer peripheral surface on the side of the inner part and, by making the outer peripheral surface on the side of the inner part of the bent part Q and the projecting part 42 for forming the drawn part of the member 40 for forming the drawn part press each other, the pipe for refractor on which the drawn part S is formed is manufactured. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
