| 摘要 |
PURPOSE:To increase the joint strength of a composite material by inserting two sheets of strips into between a pair of rolls which rotate oppositely at the peripheral speeds different from each other to form the composite material then inserting such composite material between a pair of rolls which are disposed on the down stream thereof and rotate oppositely from each other. CONSTITUTION:Two sheets of the strips 1, 2 having different quality and characteristics are inserted into between a pair of the rolls 5 and 7 which rotate oppositely from each other, by which the strips are press-welded. The composite material 7 is formed to the prescribed thickness ratio by controlling the peripheral speed ratio of a pair of the rolls 5, 7. The material 7 is provided with the high joint strength by such press-welding method but the large residual stress is generated therein, by which the joint strength is decreased. The composite material is therefored inserted into between a pair of the rolls 8 which are disposed on the down stream and rotate oppositely from each other. The residual stress is thereby removed and the joint strength of the material 7 is additionally increased. |
