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What is the usual method for controlling the shape of stainless steel strip
source：www.cnlichao.net | Release time：2026年10月08日1、 Rolling mill mechanical adjustment means (core actuator)
1. Hydraulic bending roller (working roller/intermediate roller bending roller)
Divided into positive and negative bends. Positive bending is used to improve bilateral waves; Negative bending is used to improve mid wave conditions. The six high rolling mill can be equipped with both work roll bending roll and intermediate roll bending roll simultaneously, which can cope with complex composite wave shapes and is the most commonly used method for plate shape adjustment on site.
2. Axial roll running (intermediate roll running CVC/HC technology)
The middle roll of the six high rolling mill moves laterally, changing the contact area between the rolls, preventing harmful contact at the edges, reducing edge thinning, and improving edge waves and quarter waves; The CVC rolling mill relies on the S deformation cone roller combined with the running roller to continuously change the roll gap convexity and adapt to the production of stainless steel strips with multiple width specifications.
3. Roll tilt (roll tilt adjustment)
Fine adjustment of the single-sided gap between the upper and lower rollers is mainly used to correct single-sided waves and wedge-shaped plate shapes, and belongs to asymmetric adjustment methods.
4. Twenty roll ASU segmented pressing
Precision ultra-thin stainless steel strip is commonly used, with independent fine adjustment of the pressing amount along the roller body in sections, targeted elimination of local high points and high-order wave shapes, suitable for ultra-thin and high hardness stainless steel precision strip.
2、 Roll profile pre configuration (pre foundation control)
Pre grind the original convexity/variable contact roll shape (VCR, HVC, MVC, etc.) of the rolling mill before starting the machine to counteract the elastic deflection of the rolling mill caused by rolling force.
Thick and soft stainless steel: choose smaller roller convexity
Thin and hard stainless steel (301, 430 hard): Use relatively larger roller convexity to reduce the plate shape control pressure in advance.
3、 Segmented spray cooling (thermal convexity control, handling local waves)
Cooling nozzles are set up along the width direction of the rolling mill in different zones. By adjusting the flow rate of emulsion/cooling medium in each zone, the thermal expansion of the rolling mill at different positions can be changed, and the thermal convexity of the rolling mill body can be dynamically corrected. Suitable for local quarter waves and high and low points that are difficult to eliminate with bending and running rollers, it is an important supplementary means for high-order plate shape defects.
The cooling medium for stainless steel cold rolling takes into account both lubrication and cooling, and the flow distribution needs to match the rolling speed and rolling force changes.
4、 Tension system control
Establish segmented constant tension for unwinding, rolling mill inlet and outlet, and coiling machine.
The magnitude of tension affects the internal stress distribution of the strip; Uneven tension and fluctuations in head and tail tension can easily induce abnormal plate shape and deviation
In production, tension coordination adjustment is used to assist in improving wave shape and reducing residual internal stress of the strip during rolling; Annealing and bright annealing units also control tension to prevent shape rebound after annealing.
5、 Online shape detection and closed-loop automatic control
The plate shape measuring roller collects real-time stress distribution signals of the entire width of the strip, and the control system combines mathematical models to automatically output instructions linked to the bending roller force, roll position, segmented cooling flow rate, and rolling force, forming a closed-loop feedback control and dynamically continuously correcting the plate shape. It can distinguish between secondary waves and high-order local waves, achieving automatic adjustment under continuous rolling conditions.
6、 Improvement of supporting plate shape for subsequent processes
1. Leveling unit: After cold rolling and annealing, a leveling machine is equipped, which relies on elongation control, leveling bending rollers, and tension coordination to further correct residual plate shape and release some internal stress; Stainless steel bright annealing lines are often integrated with online leveling units.
2. Bending straightening: For finished products that require high flatness of the plate shape, a bending straightening unit is used to balance the residual stress of the entire width of the strip through stretching and repeated bending, thereby improving the flatness of the finished product.
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