| 摘要 |
PURPOSE:To manufacture a thick metallic pipe, especially of small diameter, easily and at high accuracy by forming materials of metallic pipe having bisected form of the metallic pipe to be manufactured, contacting them to form a hollow, and welding the contact part. CONSTITUTION:In the entry process, metallic bands 3, 4 from coils 1, 2 installed on uncoilers 5, 6 are corrected by passing through levellers 7, 8. Then, edges are trimmed by passing through side trimmers 9, 10. In the forming process, the metallic bands 3, 4 are passed through forming rolls 11, 12 arranged in several tens of stages, and radius of curvature is successively reduced to form semi- circular metallic pipe materials 13, 14. Then, the materials 13, 14 are shifted to the welding process, and end faces are pressed against each other by squeeze rolls 15, 16 with the materials opposed to form a hollow. At the same time, the contact 18 of end faces is welded by welding equipment 17, and the materials 13, 14 are joined firmly through a weld bead 19 to form a metallic pipe 20. |
