| 摘要 |
<p>Method for bending tubular articles (1a) with a relative ratio of the bending radius (R) and the outer diameter (D) of the finished pipe which is less than 3, comprising the following steps:
- forging an article (1a) made of material with a predefined composition depending on the final use and with a predefined length (L) in the longitudinal direction and an outer diameter (D);
- preparing a die (100) comprising:
· an asymmetrical bottom die half (110) with seat (111a) for the pipe (1a); and
· a top die half (120) with punch (121) asymmetrically arranged in the longitudinal direction (X-X) with respect to the vertical centre axis of the die;
- heating the pipe in an oven to the required temperature for forging depending on the specific composition of the material;
- positioning the article (1a) inside the bottom die half (110) in the longitudinal direction;
- relative closing of the two die halves (110,120) so as to start bending of the article (1a);
- opening the die;
- extracting the bent pipe.</p> |
