Early warning method of rolling mill self-excited vibration
A technology of self-excited vibration and rolling mill, which is applied in the direction of metal rolling, metal rolling, and keeping roll equipment in an effective state, to achieve the effect of improving production efficiency and product quality, and high accuracy of vibration warning
Active Publication Date: 2016-03-30
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
However, self-excited vibration is a problem closely related to equipment, technology, production operation, basic management, etc. It involves fields such as mechanics, electricity, instruments, fluids, and lubrication. It is a complex issue related to dozens of factors. The reasons for each occurrence are different, and it is impossible to completely suppress
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[0025] The flow steps of the rolling mill self-excited vibration early warning method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0026] In general, the rolling mill self-excited vibration early warning method of the present invention acquires the vibration acceleration signal of the rolling mill at each moment, calculates the spectrum information entropy of the vibration acceleration signal at each moment, and performs smoothing processing on it, based on the The smooth value of information entropy, its difference from the previous moment, and rolling speed and other factors are used to judge whether there will be self-excited oscillation and give an early warning.
[0027] Such as figure 1 As shown, the rolling mill self-excited vibration early warning method of the present invention includes steps S100 to S500, wherein, in step S100, the vibration acceleration signal of a rolling mill a...
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The invention provides an early warning method for self-excited vibration of a mill. The early warning method comprises the steps of S100 to S500, wherein in the step S100, a vibration acceleration signal of the mill in a moment is obtained; in the step S200, the spectrum vector of the vibration acceleration signal in the moment is obtained; in the step S300, the frequency spectrum information entropy of the vibration acceleration signal in the moment is calculated; in the step S400, the smoothing is performed for the frequency spectrum information entropy to obtain a smoothness value of the information entropy; and in the step S500, the early warning discrimination logical volume is calculated based on the steps of S100 to S400 to judge if the early warning is performed. With the calculation of the frequency spectrum information entropy as the core, the early warning method for the self-excited vibration of the mill increases the early warning accuracy of the mill so as to improve the production efficiency and the product quality.
Description
technical field [0001] The invention relates to process monitoring of cold-rolled strip production, more specifically, a method for early warning of self-excited vibration of a rolling mill. Background technique [0002] Rolling mill self-excited vibration is a common problem in tandem cold rolling mills, and it is one of the obstacles that restrict the production of cold-rolled sheets and the improvement of product quality. Due to its sudden characteristics, general vibration measuring instruments and systems are not capable of this kind of vibration, and conventional early warning methods are too late to respond. Therefore, usually only the on-site operators can rely on their five senses to perform emergency deceleration at any time to avoid strip breakage or surface defects of the rolled piece. Also can not increase speed, thereby has influenced production efficiency. [0003] The vibration form of rolling mill can be divided into forced vibration and self-excited vibra...
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IPC IPC(8): B21B28/00B21B38/00
Inventor 姚寿军潘铮程其华
Owner BAOSHAN IRON & STEEL CO LTD