Method for plotting roll gap for changing roller under condition of on-line strip steel in rolling mill

Abstract

The invention discloses a cold-rolling mill HC rolling mill strip steel online roll changing and roll gap demarcating method that includes the following steps: a. according to request, haulling out old roller and installing new roller; starting new / old roller diameter bias compensating function; starting roll gap demarcating function; until rolling load is less than 50t, finishing demarcating. The invention has the advantages of simple technology, high reliability, and could save the time of changing roller. It also improves the reliability and practicability of online roller-changing.

Description

technical field [0001] The invention relates to the field of rolling mills in cold rolling mills, in particular to the field of on-line roll change for HC rolling mills in cold rolling mills. Background technique [0002] At present, after the acid rolling is online, the roll change of the rolling mill can only be done online. Since there is strip steel in the frame during the roll change, the roll gap position cannot be calibrated according to the absolute roll marking method before the online. In order to ensure that the position of the roll gap does not change before and after the roll change, the conventional relative standard roll is generally used, that is, the roll gap storage function of the relative standard roll is performed before the roll change, and the rolling force of the roll change stand is automatically pressed to the preset value. Rolling force (usually 300t), and then store the current roll gap; execute the roll gap recovery function after the roll change...

AI Technical Summary

Problems solved by technology

Although this method can complete the calibration function of the roll gap, in actual operation, in order to ensure the reliability and control accuracy of the roll gap storage, it is not allowed to operate any equipment when performing the roll gap storage and restoration function, and due to the There are continuous steel belts in the roll gap area of ​​1~4# racks, if the roll gap calibration of the current rack will affect the roll change of other racks, and other racks in the roll changing state will also affect the roll gap of the current rack Therefore, it is necessary to control the roll changing equipment of 1~4# racks at the same time when changing the rolls of the four-stand rolling mill online. As long as any one of the racks does not meet the conditions, the rest of the roll changing racks need to wait. In addition, due to human error If the online roll change cannot be performed due to operation or equipment reasons, the roll gap storage data will be wrong, and the roll gap recovery of the online roll change will not be possible. At this time, the only way to cut the steel strip is to perform off-line roll change, adding the absolute standard roll and belt Steel belt threading and other operations, which increase the roll change time

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