| 摘要 |
<p>PURPOSE:To eliminate thickness variation and to improve the product yield by reducing a change roll draft to the limit, compensating the reduction with increased drafts of other stands, quickly opening the change roll, and controlling a roll gap and speed of preceding rolls. CONSTITUTION:In the case that the roll of the 5th stand, for example, in sheet stock continuous rolling stands 1-6 is changed, the draft of the 5th stand is reduced to the limit draft generating no slip and the reduction is compensated with increases in the draft and speed adjustment of stands 1-4 except the final stand 6. The stand 5 changing rolls is quickly opened and the gap and speed of the preceding stands 1-4 are controlled. That operation prevents generation of slip flaws, makes thickness variation time a moment or very short, and improves the product quality. If the stand 5 is quickly opened at weld parts of the sheet stock, those parts are cut and discharged later, so that all product thickness variations are eliminated.</p> |
