| 摘要 |
PURPOSE:To obtain a fine load difference without any time loss by detecting the load difference generated between the operation side and driving side of at least either or both of forming rolls which face each other in a fin roll pass in a group of respective forming rolls. CONSTITUTION:When a beltlike plate 3 is formed into a final circular pipe which can be welded, load cells 13 are arranged as load detectors on operation- side and driving-side upper and lower roll stands which support both rolls 8 and 9 supported on shafts 10 and 11 through chucks 12. Then the beltlike plate moves to between the fin upper roll 8 and lower roll 9 in the fin roll path which is final finish forming through rough machining and intermediate machining and then formed. At this time, the load cells 13 are installed as the load detectors, so when it strikes on the fin of one side strongly and is formed in a right-left symmetrical shape, a right-left asymmetrical load is placed immediately on the load cells 13 arranged on the operation-side and driving-side upper roll stands. For the purpose, the load difference between both load cells 13 and 13 is detected to speedily and accurately detect the generation of torsion.
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