Anrui He

Strip shape control capability of hot wide strip rolling mills

The elasticity deformation of rolls was analyzed by means of two-dimensional finite element method (FEM) with variable thickness. Three typical mills were used as objects for analysis. A thorough study was done on the control capabilities of these mills on the strip shape. Then the strip shape control capabilities of the three mills was compared synthetically.

Comprehensive contour prediction model of work rolls in hot wide strip mill

Abstract The predictive calculation of comprehensive contour of work rolls in the on-line strip shape control model during hot rolling consists of two important parts of wear contour calculation and thermal contour calculation, which have a direct influence on the accuracy of shape control. A statistical wear model and a finite difference thermal contour model of work rolls were described. The comprehensive contour is the equivalence treatment of the sum of grinding, wear, and thermal contours. This comprehensive contour calculation model has been applied successfully in the real on-line strip shape control model. Its high precision has been proved through the large amounts of actual roll profile measurements and theoretical analyses. The hit rates (percent of shape index satisfying requirement) of crown and head flatness of the strips rolled, by using the shape control model, which includes the comprehensive contour calculation model, have about 16% and 10% increase respectively, compared to those of strips rolled by using manual operation.

Study and application of crown feedback control in hot strip rolling

Abstract Crown feedback control is one part of the automatic shape control (ASC) system. On the basis of large simulation researches conducted, a linear crown feedback control model was put forward and applied in actual strip rolling. According to its successful operation in the ASP1700 hot strip mill of Angang Group for one year and also from the statistical results of several crown measurements, it can be definitely said that this control model is highly effective and shows stable performance. The control effectiveness of different gauges of strips with the feedback control is found to increase by 10%-30% compared with that without feedback control.

Research and application of VCR plus technology in hot strip mills

VCR technology in hot strip mills can increase transverse stiffness of loaded gap, heighten control effect of roll bending, improve distribution of contact force between backup roll and work roll. However it appears to lack coordination with CVC work roll. A new objective function of VCR plus design curve was established with considering the contour of CVC, and simulation was carried out to verify the effectiveness of VCR plus by two dimensional variable thickness finite element method. The on site test results show that VCR plus technology is proved to be effective in strip profile and flatness improvement, roll consumption reduction and increase of rolled product length of rolling cycle in CVC mills.

The research and application of the optimization technique of continuous annealing line temper mill roll contour

In this article, the writer, having done a research on the stripe shape of the continuous annealing line temper mill, on the base of both the theoretical calculation and the analysis of the production data, established a relevant roll contour supporting optimization model, implemented the optimal calculation with the Hybrid Genetic Algorithm, designed a plan for new roll contour configuration, and analyzed the effect of the 2D varying-thickness theory on the roll gap horizontal rigidity and roll bending control. This article applies the result on the production, improving the stripe shape control effect of the temper mill, reducing roll bending burden.

Coiling eccentricity compensation control system based on BP Neural Network Algorithm

This paper proposes the eccentric problem in the coiling process. The BP Neural Network Algorithm compensation control method is designed: A BP Neural Network multi-resolution controller is introduced in the control cycle of coiling tension control, the purpose of the controller is to reduce the influence of coiling eccentricity on tension, thickness and flatness of strip. The simulation result approves that the method is effective to improve the coiling tension control precision.

Research on high precision profile control technique of silicon steel for UCM tandem cold rolling mill

UCM cold rolling mill has strong ability of crown and flatness control, but it seriously lacks the edge drop control ability. In this paper, an explicit dynamic finite element method is adopted to build a combinatorial simulation model for roll stacks and strip, based on the 4-stand PL-TCM cold rolling mill of Masteel. Then the method of optimizing the intermediate roll shift position is proposed to reduce transverse thickness deviation along the strip width of silicon strip. In addition, U-EDC work roll contour which was independently designed was introduced. The result of the new strip shape control technologys application shows that average edge drop of silicon steel strips is less than 5µm, and the proportion of the transverse thickness deviation along the strip width direction less than 10µm reaches 98.7%. Those new technology accomplish high precision profile control in 6-high mill which has no work roll shifting.