The method of controlling the profile of the rolls of sheet rolling mill

 

(57) Abstract:

The invention relates to the field of metallurgy, specifically, to rolling production, and relates to methods of profiling rolls of sheet rolling mills and correction of this profiling with the aid of mathematical models. The technical result - improving the quality of a band flatness. The new method is that separately determine the sizing of convexity (concavity) backup and work rolls for all mercaptotriazoles mix mill, next most frequently occurring value of this parameter obtained for the work rolls, is chosen as the base and use it as the same for all stands and for the entire range of grinding mill profiling, enter it in the model of machine profiling and determine for each stand his constant value of grinding convexity backup rolls, next, check with the help of a mathematical model to obtain the estimated profile of the rolls execution for each profilemaster separately in terms of the flatness of the strip when the calculation mode, rolling, and after the variation strategy costs cooler, in case of his failure to perform this usloviia of reductions, redistributing them among the stands, then the thickness of the strips, then the rolling speed, stopping at each variation on the parameter value that provides the minimum deviation from the terms of flatness. This solution makes it possible to apply for just mnogoluchevogo mill single (universal) profiled rolls, dramatically reduce total and reverse Park work rolls of the mill, operating costs and polishing, to unify the setting of the mill, and ultimately reduce the rejection of laminated metal flatness. table 4.

The invention relates to the field of metallurgy, specifically, to rolling production, and relates to methods of profiling rolls of sheet rolling mills and correction of this profiling with the aid of mathematical models.

A known method of controlling the profile of the rolls of sheet rolling mill, including the determination using mathematical models estimated profile of the rolls as a function of range, the parameters of the rolling mode, the values of grinding protuberances roll, the adjustment of the profile on the actual measured values of roughness of the rolls prior to installation in the mill, the transverse thickness variation tackle, those who of atalla from the relative compression for different steel grades (work hardening curves), parallel to the formation of a mathematical model for calculation of machine profiling rolls all mill using it predicted values of the rolling force and the measured value of the actual lateral thickness variation and temperature strips, roughness of the rolls, thermophysical properties of the coolant, then estimates of grinding protuberances at the expense of the cooler 50-80% of the maximum in each of the cooling sections, with rounding of calculated values of grinding protuberances to multiples of 0.05 mm, compared with the actually set empirically the values of grinding protuberances and the variation of the sectional expenses cooler (see, for example, the patent of the Russian Federation 2133162, CL 21 In 37/32, publ. 07.99).

The known method provides for individual profiling rolls of each stand of the mill, while for continuous mnogocelevykh sheet rolling mills using this method leads to unnecessary increase in working (and therefore total) Park rolls in the shop and significantly complicates the selection of pairs of rolls of the resources of the Park for each stand, even when using exhaust rolls one stands other stands, as it usually puchenau strip.

The objective of the invention is to further improve the quality of rolled strip (sheet) flatness due to the increased accuracy of the system management profile of the rolls and at the same time more efficient generation and use of the Park spare rolls in the shop and simplify the selection of the desired roll when replacing, thereby reducing downtime of the mill.

This task is solved in that in the method of controlling the profile of the rolls of sheet rolling mill, including the determination using mathematical models estimated profile of the rolls as a function of range, the parameters of the rolling mode, the values of grinding protuberances roll, the adjustment of the profile on the actual measured values of roughness of the rolls prior to installation in the mill, the transverse thickness variation tackle, coolant temperature, the rolling forces, additional input to the model dependency of the deformation resistance of the metal from the relative compression for different grades of steel, forming a mathematical model for calculation of machine profiling rolls all mill using it predicted values of the rolling force and the measured value of the actual lateral thickness variation and temperature tackle is yukata when costs cooler 50-80% of the maximum in each cell of the cooling rounding of calculated values of grinding protuberances to multiples of 0.05 mm, compared with the actually set empirically the values of grinding protuberances and the variation of the sectional expenses cooler, according to the invention separately determine the sizing of convexity or concavity of the backup and work rolls for all mercaptotriazoles mix mill, next most frequently occurring value of this parameter obtained for the work rolls, is chosen as the base and use it as the same for all stands and for the entire range of grinding mill profiling, enter it in the model of machine profiling and determine for each stand his constant value of grinding convexity backup rolls, next, check with the help of a mathematical model for the calculated profile of the rolls execution for each profilemaster separately in terms of the flatness of the strip when the calculation mode, rolling, and after the variation strategy costs cooler, in case of his failure to fulfil this condition, produce more, and consistently, failing each time conditions flatness variation of reductions, redistributing them IU is icenii parameter, which provides the minimum deviation from the terms of flatness.

This solution makes it possible to apply for just mnogoluchevogo mill single (universal) profiled rolls, dramatically reduce total and reverse Park work rolls of the mill, operating costs and polishing, to unify the setting of the mill, and ultimately reduce the rejection of laminated metal flatness.

Further, the invention is illustrated on a concrete example run for 5-stand rolling mill 1700 cold rolling sheet of JSC "Severstal".

An example of the calculation of the universal profiling rolls

As the original options was calculated using data on 14 actual modes of rolling, covering the main steel grades, thickness and width of lanes, provided with 5-stand rolling mill 1700 PHL JSC "Severstal" (table 1).

1. Initially calculated the DW.op.(amounts)grinding protuberances backup rolls all work stands. This was calculated for each variant of the original data, taking as grinding concavity of the work rolls DW.R.(amounts)desired (recommended) the value of DW.R.(amounts)= -0,2 mm Each variant of the calculation of the possible.

As a result, for each of the working stand and for each type of assortment have got a range of possible values of grinding the bulge back-up rolls, identified in these ranges, intervals, common to all ranges, and these intervals were chosen maximum value, DW.op.(amounts)that and took to calculate universal profiling work rolls.

Received grinding convexity backup rolls DW.op.(amounts)are given in table. 2.

2. Then calculated the sizing of convexity (concavity) of the work rolls under the given grinding knobs back-up rolls, listed in table. 2.

In calculating the costs of the emulsion in each stand and each cooling zone was taken to be approximately equal to 50% of the maximum values (in order to create conditions for effective regulation of thermal profile of the rolls). As a result, for each of the alternatives was obtained set of values of grinding concavity of the work rolls DW.R.(amounts). After rounding with an accuracy of 0.025 mm to a value that is a multiple of 0.05 mm, in embodiments from 1st to 7th grinding concavity of the work rolls coincided with the required value of DW.R.(amounts)= -0,2 mm

3. In versions with 8-14 is Azimov rolling with the aim to select these modes, which allow the use of work rolls with a universal profile.

The adjustment was carried out according to the developed algorithm:

1. The variation of the cost of an emulsion in an acceptable range (20 - 80% of maximum).

2. Redistribution of reductions in the stands.

3. Changing the rolling speed.

4. Change the thickness of the rolled stock.

In table 3 values of "x" shows the adjustment of reductions (thickness) and velocities that were produced for a variety of mix mill order to select a single universal profiling rolls.

After carrying out the above steps have been adjusted modes of rolling, providing the use of generic profiles work and backup rolls for the entire range of the camp (PL.4)n

The method of controlling the profile of the rolls of sheet rolling mill, including the determination using mathematical models estimated profile of the rolls as a function of range, the parameters of the rolling mode, the values of grinding protuberances roll, the adjustment of the profile on the actual measured values of roughness of the rolls prior to installation in the mill, cross ethnotaxonomy deformation of the metal from the relative compression for different grades of steel, forming a mathematical model for calculation of machine profiling rolls for all mill using it predicted values of the rolling force and the measured value of the actual lateral thickness variation and temperature strips, roughness of the rolls, thermophysical properties of the coolant, then estimates of grinding protuberances at the expense of the cooler 50-80% of the maximum in each of the cooling sections, with rounding of calculated values of grinding protuberances to multiples of 0.05 mm, compared with the actual set of empirical values of grinding protuberances and the variation of the sectional expenses cooler, characterized in that the separately determine the sizing of convexity or concavity of the backup and work rolls for all mercaptotriazoles mix mill, next most frequently occurring value of this parameter obtained for the work rolls, is chosen as the base and use it as the same for all stands and for the entire range of grinding mill profiling, enter it in the model of machine profiling and determine for each stand his constant value of grinding the bulge back-up rolls, then check with the and separately the terms of the flatness of the strip when the calculation mode, rolling, and after variation strategy costs cooler, in case of his failure to fulfil this condition, produce more, and consistently, failing each time conditions flatness variation of reductions, redistributing them among the stands, then the thickness of the strips, then the rolling speed, stopping at each variation on the value of the parameter, which will provide the minimum deviation from the terms of flatness.

 

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