Modern hot rolling mills are equipped with actuators that can modify the uneven thickness distribution across the width of the strip (crown), taking into account online measurements of various...
Conventional 4high rolling mills are equipped with hydraulic systems that allow the bending of the rolls in order to adjust the strip's crown to the required profile. ... Work roll thermal camber has a direct influence on profile and is caused by the temperature increase and the presence of temperature gradient due to heat conducted from the ...
If the cold mill rolls or hot mill coils have too much crown, the mills will roll out the centre, creating centre buckle in the process (see Figure 8). If the cold mill rolls or hot mill coils have too little crown, the mills will roll out the edges and create edge wave (see Figure 9). This is fairly common in mill master coils.
To clean work roll surfaces, put a ScotchBrite® pad, carpet, ... Figure 4 A temper mill teamed with conventional roller levelers can produce superb hotrolled plate coil. ... employs tension assist in the leveling process, which pulls out most of the camber, improves stability, and increases the thickness capacity range (see Figure 7 ...
considering the work roll edge contact or not can be obtained. D pw D b 12 j n m qj j B /2 L w /2 P /2 d w d b L 1/2 L 2/2 F /2 L b/2 q em d x L e Fig. 1. Edge contact of work rolls and Slit beam deflection mode for a 4high rolling mill 2. Roll deformation of 4high rolling mill As symmetry of the mill about the midspan of the rolls, the ...
If the cold mill rolls or hot mill coils have too little crown, the mills will roll out the edges and create edge wave (see Figure 9). This is fairly common in mill master coils. Mill work rolls and backup rolls bend and compress under the vertical loads it takes to reduce plate or sheet coil thickness.
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detect the camber and optimize the parameters of the model is an effective way to improve the accuracy of the camber control. Many researchers use laser detection or machine vision to detect the camber of steel ) In order to solve the camber problem of rolling piece in hot strip rolling
Normally elastic constant for mills may range from 1 to 4 GNm1. Roll elastic deformation can result into uneven strip thickness across. Roll material is required to have high elastic modulus for reducing the roll deformation. For producing very thin gauge strips, small diameter rolls are used. They are supported with larger rolls.
Given that the 4high CVC mill has work roll shifting function, it can use the KWRS technology to realize similar function of the 6high UCMW mill . However, the edge drop control capacity of the 6high UCM rolling mill is obviously insufficient because of the lack of work roll shifting function. Sun, et al., adopted a singleside straight ...
Thus, camber can be decoupled from wedge and hence roll tilting in the roughing mill stand can be used to control the wedge in the rolling process. A slabtoslab control algorithm is presented ...
In view of the problems of the violent crown fluctuation and unstable shape control in the endless rolling production line, the field measurement results show that the abnormal crown fluctuation is related to the shifting limit position of the work roll after the uneven wear occurs. For this reason, the asynchronous roll shifting strategy is developed, which has double attenuation of roll ...
OF SHEET SHAPE A solution to this problem is presented by the six high mill. In this case, a set of intermediate rolls is inserted between the work rolls and the backup rolls. These rolls are placed asymmetrically in the mill so that the edge of the intermediate roll is close to the strip edge.
Example for cold strip mill process. In batches of 9 coils, cold rolled steel is annealed to reduce work hardening The 6 roll configuration enables this high speed mill to produce steel of high quality with consistent shape and flatness Cold rolling mill Coils are transferred to and from the annealing furnace The combination ...
Smaller roll grinder Mill Type Work Roll Diameter (Nom.) Backing Bearing Diameter Strip Width, Max. Typical Product Minimum Gauge Narrowest Mill Widest Mill Inch mm Inch mm Inch mm Inch mm Inch mm ZR32 105 180 Ultrathin foil nonferrous, high carbon, stainless steel
Precautions for control of rough rolling width, temperature, camber, hot cracking of work rolls, etc., hot rolling technology Jan 24, 2022
Fig. : Roll bending . Roll camber can be varied by 1] bending the work rolls by applying external force. 2] Shifting of work rolls laterally with respect to centerline of the strip, 3] using shaped rolls rolls with profiles, 4] Rotation of the axis of the work roll with respect to axis of backup roll in horizontal
The modern roughing stand consists of sturdy side guides, an edger, and the roughing mill stand. The roughing mill can be provided in 2high design and 4high design. The 4high design is arranged downstream to the 2high stand. They produce transfer bar with perfect strip geometries. For this purpose, SMS group uses the Camber Free Rolling ...
Optimum workroll ground cambers are calculated which provide improved width compensation and are di stinctly diffe rent from tho se conventionally adopted in 4high stands. Plant trials confirmed the validity of the predictions in wide cold rolling and temper rolling mills.
The mechanism of the positionmode side guide in correcting slab centerline profile and camber in the roughing process of a hot strip mill (HSM) was analyzed using finite element simulation. The finite element model was established based on the actual size of the roughing mill and on the actual actuating time sequence of the roughing mill in China Steel Corporation (CSC), Kaohsiung. This work ...
A twin stand mill with a rougher stand before the steckel mill is suitable for an output of 800,000 tonnes a year. Features. Mill types: 4high work roll shift mill; 4high Pair Cross mill (PC mill) with online roll profiler and dynamic PC option for dynamic Automatic Profile and Flatness Control (APFC).
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