| 摘要 |
PURPOSE:To reduce the cost of producing a corrugated sheet by subjecting a hot material to flat rolling up to before the final pass while reversing said material, then to the rolling of the final pass by using caliber rolls. CONSTITUTION:The hot material 2 is subjected to reverse rolling and to the finishing pass with the final caliber rolls by using a 4Hi-5Hi selective rolling mill, by which the product corrugated sheet 2' is produced. The rolling mill is first set in the 4Hi rolling stage and the thick-walled material 2 is flat rolled down approximately to the product sheet thickness, i.e., to before final several passes while the material is reversed by the flat rolling mills 3, 4. The rolling work is then stopped and a back up roll 5 and the flat roll 3 are raised. A caliber roll 7 is built in to convert the rolling mill to the 5Hi mill. The rolling of the final finishing pass is executed by such roll to obtain the corrugated sheet 2'. Since the corrugated sheet 2' is easily roll-formed with the same rolling stand, the production cost of is reduced.
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