Research And Development Of Flatness Control System For Skin Pass Mill

After the American loan crisis in 2008, with the world economy slowdown, the steel industry is showing a serious surplus of production and competition is becoming increasingly fierce. Reduce unit costs, improve product quality has become an helpless choice of enterprises. Cold-rolled strip flatness as an important indicator of quality, became the focus of many steel companies and users.The skin pass mill in the 2130 continuous annealing line of ansteel is controlled by the manual control mode for flatness control, which depends on the experience of the operator. Manually adjust the parameters often because there is no timely adjustment and accuracy is not high and the impact on product flatness quality, and sometimes will reduce the yield of the product, so there is an urgent need to improve the flatness control ability, guarantee the flatness precision.The research contents of this paper are based on the background of the skin pass mill, according to the quality control of strip were studied on the export of flatness, real-time measuring and establishing the precise flatness feedback control model, the control strategy and means a variety of optimization, change the original by the experience of the operator and the visual shape defects manual operation, to achieve the control of automatic feedback loop strip shape.There are two parts in ansteel 2130 skin pass mill flatness control system, flatness measurement system and flatness control system. The flatness measurement system uses the whole roll insert type flatness measuring roll to measure and display the distribution of the strip tension, calculates the deviation of strip elongation. Flatness control system uses advanced algorithms to determine the effectiveness of the regulator coefficients, calculates the respective regulator optimal adjustment amount, adjusts the corresponding flatness control mechanism dynamically, changes the roll gap shape precisely and achieves good control the strip flatness the online in the endThe implementation of this subject, and even the domestic current situation of Anshan can end the cold rolling machine of shape control depends on manual operation, to achieve high precision automatic control, greatly improve the shape quality of cold-rolled products, has great economic and social benefits.