A method for monitoring and adjusting the vibration of a cold tandem rolling mill

Abstract

The invention discloses a method for monitoring and adjusting the vibration of a cold tandem rolling mill. In the method, the rolling speed for the current stand of the rolling mill to roll the strip steel is the set speed, and the thickness gauge is arranged between the current stand and the next one. Between racks, the initial strip thickness value h on the outlet of the current rack 1 Measured and compared with the strip thickness target value h 目标 Compare: when |h 1 ‑h 目标 |<H 0 , the rolling speed maintains the set speed; when H 0 ≤|h 1 ‑h 目标 |≤H 1 , first adjust the rolling speed to 50% of the set speed, and then adjust the tension between the current stand and the next stand to increase the tension by 1% to 8%; when |h 1 ‑h 目标 |>H 1 , first adjust the rolling speed to 20% of the set speed, and then send a shutdown signal; where, H 0 is the safe setting value, H 1 is the critical set value. The invention realizes the normal and stable production of the continuous cold rolling mill and improves the production efficiency of the cold rolling production line.

Description

technical field [0001] The invention relates to the technical field of cold-rolled steel strip production, in particular to a method for monitoring and adjusting the vibration of a cold tandem rolling mill. Background technique [0002] In recent years, with the rapid development of the electric vehicle industry, the demand for non-oriented high-grade silicon steel products is also increasing. Non-oriented high-grade silicon steel products are extremely brittle due to their material properties, resulting in poor rolling stability and prone to strip breakage and stacking accidents during the rolling process. Therefore, current cold-rolled non-oriented high-grade silicon steel products are generally carried out by 20-roll single-stand rolling mills rolling. However, the production efficiency of the single-stand rolling mill is significantly different from that of the continuous rolling mill, and the manufacturing cost is much higher than that of the continuous rolling mill. T...

AI Technical Summary

Problems solved by technology

Non-oriented high-grade silicon steel products are extremely brittle due to their material properties, resulting in poor rolling stability and prone to strip breakage and stacking accidents during the rolling process. Therefore, current cold-rolled non-oriented high-grade silicon steel products are generally carried out by 20-roll single-stand rolling mills rolling

However, the production efficiency of the single-stand rolling mill is significantly different from that of the continuous rolling mill, and the manufacturing cost is much higher than that of the continuous rolling mill. Therefore, under the same conditions, the cold continuous rolling of non-oriented high-grade silicon steel products has stronger market competitiveness.

[0003] At present, non-oriented high-grade silicon steel products have poor rolling stability in continuous rolling mills. Due to the high silicon content and large deformation of non-oriented high-grade silicon steel products, the work hardening is relatively large after rolling in rack passes, and the vibration caused by vibration during the rolling process The rolling force in the frame and the tension between the frames fluctuate abnormally, and the fluctuation of the rolling force and tension acts on the brittle material, which eventually leads to broken belts in the frame and high-speed stacking accidents

[0004] For non-oriented high-grade silicon steel products with a silicon content of 2.9% and above, if rolling with a cold tandem rolling mill, due to the extremely brittle material properties, it is prone to high-speed vibration, high-speed strip breaking and stacking steel accidents during the rolling process

[0005] In addition, during the rolling process of non-oriented high-grade silicon steel products, vibrations cause thickness fluctuations, resulting in changes in rolling force and tension between stands, which in turn lead to poor shape, inconsistent thickness and surface vibration marks after rolling of high-silicon products. Defects, do not meet the production needs of users

In terms of vibration control, at present, it can only be dealt with through manual observation and manual adjustment of process parameters. This method has obvious hysteresis, and there is a large misjudgment in manual adjustment, which leads to poor adjustment effectiveness.

Images