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Because of their design, EDC roll on the edge of the roll gap pressure distribution units in the region have a positive reaction, while a pair of rollers to ensure smooth contact, reduce wear and tear. Sinking of the natural edge of the strip due to the overlapping degree increases.
EDC system is mainly used to reduce trimming losses. EDC EDC cooling roller and the cold rolling mill on the same test, saving test materials 5 15 mm wide. In addition, the rolling experiment also established the EDC operating conditions the use of roller system proved EDC roll in reducing the strip edge of the sink is very effective.
Rolled aluminum (the edge of the extended area and close with the strip edge) often appear in the edge of the region through the formation of defects can roll EDC special contour shape adjustment. Corresponding test is carried out in Europe a cold factory.
Of course, EDC system, the best idea to use depends on the rolling mill, rolling material and product portfolio.
In rolled steel, EDC cooling in the expansion of the effective strip edge region, but the role of EDC roll strip edge region only.
The tandem cold rolling machine can be the first of several EDC cooling rack. Here, the greater amount of heat transfer to the work rolls, so that the thermal crown larger, sinking deeper edge strip. EDC roll can theoretically be used on all the rack.
A physical device model, EDC provides a start condition activated, activate the device also based online determination of the shape of the edge strip feed forward and feedback control. With the shape and flatness control system, can achieve a high degree of processing optimization.
Figure 8 shows the simulated five stand tandem rolling mill under construction in two different EDC strip shape.
All simulations are the cutting edge of tropical wood as a raw material. EDC is not the first simulation system, five rolling to the edge can be observed in the continuous increase in the sinking. The second simulation is only 1 rack EDC cooling system installed in this rack was the edge of the sink observed decrease in rolling in the next (middle), the edge of the sink and began to increase. The best result is to install the rack in all EDC systems simulation.
The first installation of a new EDC system roll mill is used for both copper and copper alloy chassis serial six roller mill. Thyssen Krupp Stahl six new five stand tandem mill roller rack installed in all EDC roll system. SMS will provide the required control systems and measuring instruments.
Edge of the hot jet. Improved flatness control, especially breakdown aluminum rolling mill and finishing mill Another possibility is that when the edge of thermal spray.
Aluminum rolling process, the scope of work rolls of hot strip width can not be achieved. The difference with the uniform load distribution caused by the close of the strip edges, while the work roll bending waves will eventually lead to a quarter of the middle strip defects. These differences in flatness through HES system (hot edge of the strip system) to effectively regulate. The hot coolant sprayed into the work roll strip between the edge and roll neck region, can significantly reduce the work roll is covered with a material part of the thermal deformation. In practice, each work roll on each side of the other two nozzles open, almost completely remove the distortion.
In the existing mill, the third row will be added to each of the independent work of the nozzle roll jet set two rows of the original pipe. Nozzle is a separate control, flatness control systems by working closely in the event of the edge strip width based on open.Nozzle size of about 25 liters / min, periodically need 200 L / min of hot oil; temperature higher than the coolant temperature is 40 ~50 ℃.
In Bahrain Garmco Gulf Aluminium Rolling Mill Co.'s Operating experience and other reference experience shows that this technology has significantly improved the smoothness of rolling in the control, improved product quality and yield, and make the best use of mill.
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