| 摘要 |
PURPOSE:To enable efficient and uniform stress relief annealing of many thin sheet-like metallic bars while preventing the contact with each other by applying adequate tension to the metallic bars in a parallel state at adequate intervals and blowing a convectional heating gas thereto from above and below at an adequate blowing rate. CONSTITUTION:The many thin sheet-like metallic bars respectively having 0.15-0.25mm thickness are supplied from an un-coiler 1 and are passed in the parallel and tense state through an annealing furnace consisting of a heating furnace 7 and a cooling chamber 8, where the metallic bars are subjected to stress relieving by heating and cooling. The metallic bars are thereafter coiled on a coiler 21. The spaces between the adjacent metallic bars 2, 2... in the heating furnace 7 are set at about 10mm. The gas for convectional heating is blown from nozzles 12 of a chamber 11 in the heating furnace 7 toward the metallic bars 2 at <=15m/sec blowing rate and >=1kg/mm<2> tension is applied thereto by tensioners 5, 19. The lateral moving sizes of the metallic bars 2 are thereby maintained respectively at 5mm and the injuries of the bars 2 by the contact with each other is effectively prevented.
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