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1、附 录Row tandem cold rolling mill models and the flatness control In the second half of 1994, Sidmar on the 1st column of cold rolling mill was transformed into a row of five full mill, and equipped with a pickling line. The composition of its mill equipment, including: Screwdown hydraulic rack on the
2、 body; with the first-axial movement to the middle of the six roll roller mill; rack all the support roll; final Axial on the rack Mobile work roll. The new cold-rolling technology and this new pickling line to allow the pickling process, the export size and strip mill flatness of the closed-control
3、. It contains two straight measurement system: First, the exit of the mill, and the other is on a rack between the cracks. Flatness through the traditional first-and last a feedback loop between the methods used straight-line model in support of the roll and axial movement set up to control the poin
4、t. On-line model used to describe 6,4 roller mill axial movement of flatness of linear elements, parabolic and quartic equation. Apart from the straight-degree feedback control and set up online model, a unique feedback system through the strip to confirm the new shape of the type of rack with the f
5、latness measurement to improve the mill exports straightness. The new system all have reached the objective of improving the range of products offered by the flatness quality requirements. Flatness requirements Sidmar rolling mill-650 1880 mm, thick 0.3 3.5 mm and material strength from low-carbon s
6、teel to HSLA and in the scope of the carbon steel materials. From the cold-rolled flat-out good for the workpiece can increase production and productivity, it is easy to meet the requirements of the final customer. Typically, the flatness of raw materials from the change to 15 units to go through th
7、e entrance to the export line, but according to the residual error and patterns of different wavelengths, the rolling of the roughness is still greatly changed. Sidmar of the mill, in the stable operation of the circumstances, from raw materials to 8 units with volume flatness is the standard perfor
8、mance, better than from raw materials to 11 units, weaker than from raw materials to 5 units. In the new online rolling, rolling with the completion of the volume was shorter, and its new hot-rolled to the 12 volumes between Weld. In this regard, it is the flatness of interference is particularly im
9、portant, but also for a single feedback system of feedback caused great difficulties. Different sizes of the mill online flatness requirements Physical model makes use of the mechanical structure of the most complex flatness model to a basic model was established. This basic model of the physical pr
10、inciples into mathematics and as a module on the code ofprocedure. Module code changes set to be simulated with special machinery to the requirements described in the form of software. For example, if the same model can be set to approximate a graphic description of quadratic equation or linear, qua
11、dratic equation and four equations, or for a more detailed set around the strip of 50 units. Sidmar mills online needs of the linear model of the device, secondary and four of the equation. Shape model includes the following modules: Roll the deflection Roll of contact stress Roll-indentation Tensil
12、e strength Coil pressure Roll the deflection - Roll strength calculation using a typical beam bending theory. Roll can be considered a distribution load with the beam, on the assumption that the Centre for roller bearings fulcrum mainly by the deflection and bending torque and shear stress caused. B
13、ecause the roll diameter and length of the roll ratio is very large, shear stress caused by deflection is also counting. With short tapered roller, axial movement can reduce support the work roll contact length. In this way, across the width of the strip work roll can reduce the deflection. This way
14、, Roll asymmetric axial movement can significantly reduce the width of the strip flatness of the sensitivity. Roll axial movement of the results can roll around the support of the changes in the distribution of load to simulate. Roll of contact stress - the support between the two roller pressure le
15、d to a local point of contact around the defect, along the axis of a distribution of the load. Through the Hertz pressure, according to two of Roll contacts between the different deflection to simulate the distribution of load. Roll-indentation - Roll gap appearance by the work roll and strip contac
16、ts between the different and flexible indentation great impact. Roll a small indentation model regional units on the pressure arising from the roll for the deflection factor. Straightening depend on the general roll and strip contact surface of the combined effects of small area. Tensile strength - flat, tensile strength and strip the pressure caused from the outline of each
