A method for on-line monitoring of backup roll spalling in hot continuous rolling
A back-up roll and hot tandem rolling technology, applied in the field of steel manufacturing, can solve problems such as inability to perform preventive monitoring in advance, temporary shutdown, and increase in abnormal production shutdown time, improve the control accuracy of product quality indicators, and prevent sudden damage or failure. , the effect of reducing energy consumption
Active Publication Date: 2021-05-07
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology
Since the hot tandem rolling mill is generally composed of a 7-stand four-high rolling mill, this method has the following disadvantages: (1) It cannot be accurately judged that the rolls of a certain rolling mill are peeled off, and a large number of roll inspections are required to eliminate them, resulting in a significant increase in abnormal production downtime (2) Preventive monitoring cannot be carried out in advance, and it can only be found after the roll peeling fails, which may easily cause roll failure and temporary shutdown, leading to the expansion of the accident
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[0019] An on-line monitoring method for spalling of hot continuous rolling back-up rolls in this embodiment comprises the following steps:
[0020] (1) Make the support roll of the rolling mill rotate at a constant speed, and gradually reduce the roll gap of the rolling mill until the pressing force reaches the target range, and continue to run for a period of time, and record the pressure curve during this period;
[0021] (2) Perform analytical analysis and frequency spectrum analysis on the pressure curve. If the pressure curve is a smooth and smooth periodic curve, it is judged to be normal, such as figure 1 , which is the normal pressure curve; if the pressure curve satisfies the following conditions at the same time: 1. There are burrs with a peak-to-valley difference greater than or equal to the threshold, the threshold in this embodiment is 120 tons; The cycle coincides; then it is determined that there is spalling phenomenon or risk of spalling in the back-up roll of ...
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The invention relates to an on-line monitoring method for spalling of hot continuous rolling back-up rolls, comprising the steps of acquiring pressure curves, analyzing pressure curves, and the like. The spalling on-line monitoring method for hot continuous rolling backup rolls provided by the present invention can prevent and diagnose the status of the backup rolls, prevent the backup rolls from being damaged or fail suddenly, and realize the stable production of hot-rolled strip steel and the improvement of product quality index control accuracy.
Description
technical field [0001] The invention relates to an on-line monitoring method for spalling of hot continuous rolling backup rolls, which belongs to the technical field of iron and steel manufacturing. Background technique [0002] Roll peeling is a common production accident in the hot strip production process. With the increasingly fierce competition in the hot-rolled coil market, according to the different uses of the downstream processes, the products will develop in the direction of high-strength thinning, which will increase the rolling pressure and the difficulty of rolling. The contact stress also increases accordingly, and at the same time, tail flick accidents are prone to occur when rolling thin-gauge products, causing the tail of the strip to be broken or torn and left in the rolling mill, and the remaining fragments will often adhere to the surface of the roll. Commonly known as work roll sticky meat, which in turn causes stress concentration. In this context, t...
Claims
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IPC IPC(8): B21B38/00
CPCB21B38/00
Inventor 谢向群付文鹏
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD