| 摘要 |
FIELD: technological processes. ^ SUBSTANCE: group of inventions relates to metal plastic working, in particular to manufacturing of ceiling section bars with hollow wall. Method consists in serial bending of section bar elements in the main thin-walled strip billet, lining shelves on the outside with strip lining stock by bending of its edge elements to embrace end parts of shelves. In process of final bending of facing strip stock at edge elements from the side of wall, notches of determined depth are applied with pitch depending on width of section bar shelf. Lower roller of the last working stand of device has protrusions for application of notches. ^ EFFECT: improved quality of bent profiles, reduced number of transitions and labour intensiveness of manufacturing. ^ 3 cl, 3 dwg, 1 ex |
