Support roller for four-roller rolling mill with wide thick board

A four-high rolling mill and back-up roll technology, applied in metal rolling, metal rolling, metal processing equipment, etc., can solve the problems of short service life of back-up rolls, uneven contact stress distribution, etc., to prolong service life, roll gap Uniform distribution of contact stress and the effect of ensuring production quality

Inactive Publication Date: 2012-11-28
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The technical problem to be solved by the present invention is to provide a back-up roll of a four-high rolling mill for wide and thick plates, s...

Method used

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  • Support roller for four-roller rolling mill with wide thick board
  • Support roller for four-roller rolling mill with wide thick board
  • Support roller for four-roller rolling mill with wide thick board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In this embodiment, the back-up roll is a four-roll mill back-up roll with a diameter of 2100mm and a roll body length of 4300mm, such as Figure 4 , L2 is 50mm, and H2 is 0.7mm.

[0059] The value of L1 is:

[0060] L1=1000j+300k, j and k are roll shape design parameters related to rolling conditions. In this embodiment, the value of j is 0.845, and the value of k is 0.35, so L1 is taken as 950 mm.

[0061] The cubic curve segment 2 between L1 is given by the equation y=ax 3 +bx 2 +cx+d is determined, and its curve form is as follows Figure 7 shown. The values ​​of each coefficient in the equation are as follows:

[0062] a=0.0000000008;

[0063] b=-0.0000025;

[0064] c=0.0023;

[0065] d=-0.0002.

[0066] The cubic curve 2 of the L1 section is tangent to the roll shape of the flat roll end 1 in the middle of the backup roll and is smoothly connected.

Embodiment 2

[0068] In this embodiment, the back-up roll is a four-roll mill back-up roll with a diameter of 2200mm and a roll body length of 4500mm, such as Figure 4 , L2 is 50mm, and H2 is 0.7mm.

[0069] The value of L1 is:

[0070] L1=1000j+300k, j and k are roll shape design parameters related to rolling conditions. In this embodiment, the value of j is 1, and the value of k is 0.3, so L1 is taken as 1090 mm.

[0071] The cubic curve segment 2 between L1 is given by the equation y=ax 3 +bx 2 +cx+d is determined, and its curve form is as follows Figure 7 shown. The values ​​of each coefficient in the equation are as follows:

[0072] a=0.0000000005;

[0073] b=-0.000002;

[0074] c=0.0018;

[0075] d=-0.0015.

[0076] The cubic curve 2 of the L1 section is tangent to the roll shape of the flat roll end 1 in the middle of the backup roll and is smoothly connected.

Embodiment 3

[0078] In this embodiment, the back-up roll is a four-high rolling mill back-up roll with a diameter of 2000mm and a roll body length of 4000mm, such as Figure 4 , L2 is 50mm, and H2 is 0.7mm.

[0079] The value of L1 is:

[0080] L1=1000j+300k, j and k are roll shape design parameters related to rolling conditions. In this embodiment, the value of j is 0.8, and the value of k is 0.4, so L1 is 920 mm.

[0081] The cubic curve segment 2 between L1 is given by the equation y=ax 3 +bx 2 +cx+d is determined, and its curve form is as follows Figure 7 shown. The values ​​of each coefficient in the equation are as follows:

[0082] a=0.000000002;

[0083] b=-0.000004;

[0084] c=0.0029;

[0085] d=0.0075.

[0086] The cubic curve 2 of the L1 section is tangent to the roll shape of the flat roll end 1 in the middle of the backup roll and is smoothly connected.

[0087] There are two forms of the backup rolls of the 4300mm wide and thick plate rolling mill in a domestic me...

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Abstract

The invention discloses a support roller for a four-roller rolling mill with a wide thick board; the support roller has an axisymmetric roller type curve, and sequentially comprises a flat roller section, a cubic curve section and an oblique line segment from the centre of symmetry to two sides, wherein the cubic curve section has the length of L1 and the chamfering depth of H1; the L1 has a value range of 920-1090mm, and the H1 has a value range of 0.71-0.91mm; the cubic curve section has an equation as follows: y=ax3+bx2+cx+d, wherein a, b, c and d are roller type optimization coefficients related to rolling conditions; and the oblique line segment has the length L2 of 50mm and the height H2 of 0.7mm. The support roller type four-roller rolling mill can meet the rolling requirements on different board widths, and the contact stress distribution among rollers trends to be even, so that the service life of the support roller can be prolonged; and meanwhile, the thickness difference of strip steel is well controlled, and the production quality of a board strip can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of plate and strip rolling mills, in particular to a back-up roll of a four-high rolling mill for wide and thick plates. Background technique [0002] The function of the back-up roll of the wide strip mill is to transmit the rolling force and improve the lateral stiffness of the roll gap. The distribution of inter-roll contact pressure between the backup roll and the work roll directly affects the wear and fatigue hardening state of the roll surface, and is the main cause of the peeling of the roll surface. The uneven distribution of contact stress on the roller surface of the backup roller will greatly shorten the service life of the backup roller, and the roll shape of the backup roller determines the distribution of the contact stress between the rollers. [0003] The main damage form of backup roll is roll surface wear and peeling. The amount of wear of the backup roll is proportional to the contact p...

Claims

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Application Information

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IPC IPC(8): B21B29/00
Inventor 孙登月杜征付万堂许石民
Owner YANSHAN UNIV
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