Heavy and medium plate mill non-retraction precision variation quick-speed roll seam initialization method

Abstract

The invention refers to a kind of medium plate rolling technology, applies to the setting of retraction-less variable-precise quick roll seam, the passes which affects the precise of rolling are the final three passes, to former several passes, the electro-hydraulic union setting doesn't need higher setting precise, it only need to set precise on later passes. The merits of the invention are: the invention saves the time of hydraulic cylinder retraction and the times of hydraulic micrometer, upgrades the speed of roll seam settings.

Description

technical field [0001] The invention relates to a medium and heavy plate rolling technology, which is suitable for a fast roll gap setting method with no shrinkage and variable precision in a medium and heavy plate rolling mill. Background technique [0002] The opening of the medium and heavy plate mill is relatively large, and it will bring more trouble if full hydraulic pressure is used. At present, most of the medium and heavy plate rolling mills adopt the electric-hydraulic joint method to set the roll gap. This method can not only ensure the speed of the roll gap setting, but also ensure the accuracy of the roll gap setting. The speed and accuracy of the roll gap setting are A pair of contradictory factors, if the precision of the roll gap setting is relatively high, it will inevitably take more time to adjust the roll gap. Generally, the setting accuracy of the electric pressing is low, while the setting of the hydraulic pressing is relatively low. High precision, fo...

AI Technical Summary

Problems solved by technology

At present, most of the medium and heavy plate rolling mills adopt the electric-hydraulic joint method to set the roll gap. This method can not only ensure the speed of the roll gap setting, but also ensure the accuracy of the roll gap setting. The speed and accuracy of the roll gap setting are A pair of contradictory factors, if the precision of the roll gap setting is relatively high, it will inevitably take more time to adjust the roll gap. Generally, the setting accuracy of the electric pressing is low, while the setting of the hydraulic pressing is relatively low. High precision, for long strokes, the speed of electric pressing is fast, and the speed of hydraulic pressing is slow; for short strokes, since the start and brake of electric pressing need a certain amount of time, the set speed is not as fast as hydraulic pressing Fast, so it is necessary to increase the speed of electro-hydraulic joint setting of the roll gap without affecting the dimensional accuracy of the final product according to the characteristics of the medium and heavy plate rolling process. This is a crucial part for improving the rolling rhythm. Since the roll gap setting speed has a great influence on the rolling output, it is necessary to propose a suitable method to increase the roll gap setting speed without affecting the thickness control accuracy

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