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Pass schedule setting method for plate rolling

A technology of pass schedule and setting method, which is applied in metal rolling, metal rolling, rolling mill control devices, etc., and can solve the problems of undiscovered rolling pass schedule, strict product quality correspondence, etc.

Inactive Publication Date: 2012-07-04
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method based on these experiences, it is difficult to respond instantaneously to changes in the structure of rolling products, changes in the structure of rolling lines, and stricter product quality.
[0016] That is, at present, there is no method for setting the rolling pass schedule for plate rolling that can stably obtain the desired plate crown and / or flatness with as few total rolling passes as possible.

Method used

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  • Pass schedule setting method for plate rolling
  • Pass schedule setting method for plate rolling
  • Pass schedule setting method for plate rolling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Below, based on Figure 1 to Figure 3 An example of the present invention will be described. In addition, numerical values, functions, and the like used in the following examples are merely examples for explaining the present invention, and the present invention is not limited to the following examples.

[0087] Apply the present invention to the figure 1The setting of the rolling pass schedule for the rolling performed by the rolling mill 1 shown in . In the rolling mill 1, the rolled plate 2 is conveyed from upstream thereof. At this time, the plate thickness h of the rolled plate 2 is measured by a plate thickness gauge 3 provided on the upstream side of the rolling mill 1 in . The plate thickness h of the rolled plate 2 measured by the plate thickness meter 3 in sent to computing device 4. In addition, information such as the steel type, size, and temperature of the rolled plate 2 is also transmitted to the computing device 4 . In addition, the control device...

Embodiment 2

[0102] Plate thickness h at the input side of the rolled plate in and output side plate thickness h out In the case where the difference between is small, embodiment 2 is preferable. Calculation by the present invention is carried out in the calculation device 4 as in the first embodiment. Thereby, the flatness of the rolled sheet on the output side of each pass is ensured, and the sheet convexity C on the output side of the final pass is searched for. hN It is the rolling pass regulation within 50μm. Among them, the initial plate thickness h of the rolled plate 2 in It is 48.6mm. In the rolling machine 1, the rolled plate is rolled until the output side plate thickness h of the final pass out Aim for 8.0mm. Therefore, in the present embodiment, the evaluation function Φ expressed by the formula (5) is employed. That is, the power exponent I=0.2.

[0103] Φ = Σ i = 1 ...

Embodiment 3

[0111] Plate thickness h at the input side of the rolled plate in and output side plate thickness h out In the case where the difference between is large, this embodiment 3 is preferable. Calculation by the present invention is carried out in the calculation device 4 as in the first embodiment. And, while securing the flatness of the rolled sheet on the output side of each pass, it is searched for a method that can make the sheet convexity C on the output side of the final pass hN It is the rolling pass regulation within 50μm. Among them, the initial plate thickness h of the rolled plate 2 in It is 130.3mm. In the rolling mill 1, the rolling is carried out until the final pass output side plate thickness h out Aim for 8.7mm. Thus, in the present embodiment, the evaluation function Φ represented by the formula (6) is employed. That is, the exponent I=4.

[0112] Φ = Σ i = 1 ...

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Abstract

Provided is a pass schedule setting method for rolling an object plate. The method comprises a step of setting the total number of rolling passes, a step of assuming a plurality of pass schedules for the total number of rolling passes, a step of utilizing, for each of the pass schedules, an evaluation function which uses as an index the value obtained by dividing the difference between a characteristic value of the object plate in each pass and the ideal value for the characteristic value by the power multiplication of the exit-side plate thickness of each pass, and a step of setting a schedule which has the smallest evaluation function among the pass schedules.

Description

technical field [0001] The invention relates to a method for setting a rolling pass schedule of plate rolling. [0002] This application claims priority based on Japanese Patent Application No. 2008-223824 filed on September 1, 2008 and Japanese Patent Application No. 2009-058202 filed on March 11, 2009 in Japan, the contents of which are incorporated herein by reference. Background technique [0003] When a sheet material is rolled to a predetermined sheet thickness in a plurality of rolling passes, it is necessary to set a so-called rolling pass schedule as to how to reduce the sheet thickness in each pass. [0004] The maximum rolling amount in each pass is determined by the allowable load of the rolling mill shell, the allowable torque of the rolling mill motor and main shaft, the allowable contact load of the rolling drum, and the biting of the rolled plate into the rolling mill Boundaries and other decisions. In the method for setting the rolling pass schedule disclo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/00
CPCB21B37/00B21B37/16B21B37/24
Inventor 比护刚志高町恭行小川茂沟口洋祐五十岚一嗣福冈靖
Owner NIPPON STEEL CORP