| 摘要 |
PURPOSE:To improve the workability and the yield of a product in the reverse rolling by executing ordinary rolling down to a prescribed sheet thickness, then dividing the material and executing lap rolling at the point of the time when the material is rolled down to the prescribed sheet thickness or below. CONSTITUTION:Two sets of reels 2, 3 and 4, 5 are disposed before and behind a rolling mill 1 and the ordinary rolling is executed by using one set of the reels 2, 3 during the time when the sheet thickness of the rolling material 10 is large. The overall length of the sheet is then detected by a sheet length measuring instrument 11 and the point when the length of the sheet at the time of the subsequent rolling in the reverse direction attains half the overall length is detected by the measuring instrument 11. The rolling is stopped at said point and the material 10 is cut by a cutting machine 12. The materials 10, 10' are then subjected to lap rolling in the rolling of the suceeding pass and the materials 10, 10' are coiled on reels 5, 3. Since the lap rolling is executed when the sheet thickness decreases to about 1mm thickness, the workability is improved and the yield of the product is improved.
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