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Because the electric pressure slow, poor accuracy, not suitable for on-line rapid trimming. The general hydraulic cylinder response speed is 6 times higher than the electric pressure, accuracy is greatly higher than that of the electric pressure screw. In the strip mill finished frame installation of hydraulic cylinder, PM-AGC can achieve rapid roll gap adjustment. If the pressure sensor with the front frame and finished product, can realize the pressure measuring feedforward thickness gauge control. Such as thickness gauge is installed in the finished frame export, then realize the thickness tester feedback control, the head and tail temperature difference this will result in the long time rolling compensation, can greatly reduce the fluctuation of the whole roll of strip thickness deviation, the precision of the product more assurance. A plant uses Zhengzhou optical error Institute for the production of 3 m laser thickness gauge monitoring product thickness gap adjusting device, and matched with the computer and hydraulic roller, hydraulic control of AGC system, reduce the size of strip thickness fluctuation. The last strip head and tail of nearly 40 mu m thick difference, using hydraulic pressure feedback AGC or thickness gauge monitoring the AGC, although the single weight increased, rolling time is lengthened, the head and tail thickness difference decreased 10 microns, enable the products to improve the market competition ability further.
Plate four roller mill of old have used hydraulic AGC thickness control, to improve the accuracy of the obtained thickness effect.
10 no live micro tension rolling
A looper used to reflect the interstand tension level, but energy consumption in thick billet rolling is very high, in the finished frame reflect fast enough, to further improve the accuracy of plate thickness of the limit. Therefore, some foreign manufacturers developed loop rolling success, save a looper. No loop rolling first need to accurate calculations of the rolling speed and stability after the tension, and the rolling mill speed compensation after incremental dynamic velocity drop. The loop rolling rely mainly on the current memory method, establishing the observer, arm coefficient suitable formula to calculate the tension, also choose this tension, tension control.
The actual rolling tension depends mainly on the workpiece before and after rolling mill freedom of entry and exit of the speed difference, also with the motor drive ability and tension on the effect of forward and backward slip on. The utility model is proposed for the calculation of the tension of literature, make the rolling parameters simple calculation. This formula considering the effects on forward and backward slip tension motor and rolling, not only applies to the strip is also applicable for wire rod roughing tension calculation.