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A two-pass rolling method for variable thickness strip rolling

A strip rolling and variable thickness technology, which is applied in the field of two-pass rolling for variable thickness strip rolling, can solve the problems that are not easy to realize, and require high accuracy and high requirements for incoming material contour recognition.

Active Publication Date: 2016-04-27
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The patent 200910012395.6 published by Northeastern University mentions that two passes are used to complete thickening rolling. The method mentioned in the patent is to roll out a certain profile in the first pass, and to use micro-tracking in the second pass. Rolling control is carried out according to the shape of the incoming material, and the realization of this method has higher requirements for the recognition accuracy of the incoming material contour. It is not easy to set different rolling parameters according to the identification results

Method used

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  • A two-pass rolling method for variable thickness strip rolling
  • A two-pass rolling method for variable thickness strip rolling
  • A two-pass rolling method for variable thickness strip rolling

Examples

Experimental program
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Embodiment

[0093] A certain sample requires the contour after rolling such as Figure 4 As shown, h1=2.0mm, L1=200mm, T1=100mm, h2=1.0mm, L2=700mm, the incoming strip thickness is 2.5mm, the width is 300mm, the diameter of the work roll is 160mm, and the rolling speed is maintained at 150mm And s. The incoming material is a certain steel grade, and its deformation resistance calculation formula is k s =k(ε+m) n , The deformation resistance parameters are k=30, m=0.01, n=0.1.

[0094] The model uses the Hill formula to calculate the rolling force:

[0095] P = b · k p · κ · D p R ′ · ( H - h ) X Z p

[0096] In the formula, P- is the rolling force (kN);

[0097] b— is the width of the rolled piece (mm);

[0098] k p -Is the average deformation resistance (kN / mm 2 );

[0099] κ—is the tension influence coefficient;

[0100] D p —In order to consider the external friction stress state coefficient after flattening,

[0101] D p = ...

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Abstract

A method for performing two-pass rolling on thickness variable strips includes calculating rolling reduction required by a first pass and the length of each section; presetting a target rolling force P<SET> of a second pass; supposing outlet thickness h1_i and h2_i of the first pass, and calculating parameters such as a rolling force and rolling power required by the first pass; if the parameters exceed the capacity of a rolling machine, returning to reset the parameters; calculating deformation resistance KF1_i and KF2_i of a first-pass outlet strip according to outlet thickness of the first pass; calculating a second-pass rolling force Fr1 and Fr2 required for rolling the strip from h1_i and h2_i into hi and h2, judging whether Fr1 and Fr2 are equal to the target rolling force P<SET> of the second pass, resetting h1_i and h2_i if Fr1 and Fr2 are not equal to the target rolling force P<SET> of the second pass, and performing returning again; calculating corresponding outlet length. According to the method for performing two-pass rolling on thickness variable strips, by means of two-pass rolling, large rolling reduction is achieved without increasing rolling capacity; a constant rolling force manner is used for the second pass so that the shape of the strips is corrected.

Description

Technical field [0001] The present invention relates to a rolling method for rolling a variable thickness strip in the field of metallurgy. In particular, the present invention relates to a two-pass rolling method for rolling a variable thickness strip, that is, the periodic rolling is realized by two-pass rolling. Variable thickness rolling, specifically, the first pass achieves most of the reduction, and the second pass adopts constant pressure rolling, which can not only further reduce the strip, but also the shape of the strip. Correct. The variable thickness strip indicates that the longitudinal thickness of the strip changes continuously, and the rolled strip may be a strip and other cold-rolled materials, such as aluminum. Background technique [0002] In order to achieve the goal of reducing the weight of automobiles, the automotive industry is currently promoting the use of a strip with continuous changes in thickness obtained by rolling-a thickened plate. The rolling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22B21B37/26
CPCB21B1/22B21B37/26
Inventor 熊斐李山青姜正连张春伟
Owner BAOSHAN IRON & STEEL CO LTD
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