外文翻译

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 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.

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 point. 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 flatness 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 steel 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 the 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 performance, 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 important, 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 principles into mathematics and as a module on the code of

procedure. 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, quadratic equation and four equations, or for a more detailed set around the strip of 50 units. Sidmar mill's 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

Tensile 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. Because 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, 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 led 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