CN108746213A - A method of improving high-strength IF steel rolling stability - Google Patents

Abstract

A kind of method improving high-strength IF steel rolling stability of the present invention, using five passage cold rollings of F1~F5, before being rolled, adjustment rolling pressure distribution, it is the 50~55% of F1 racks to make the absolute draft rate that the absolute draft rate of F2 racks is 80~85%, the F3 racks of F1 racks；F1~F3 rack working rolls select the working roll with convexity, intermediate roll shifting value to increase by 5~10% on the basis of two level setting value, and the roller value control of working roll and intermediate calender rolls is the 10%~30% of two level setting value；The present invention realizes small curved power control in the operation of rolling, roller parameter adjustment space is increased, between operation of rolling rack after waviness, it can be adjusted into andante shape rapidly, it can preferably ensure strip stable rolling, it is easy to operation, it greatly reduces strip and rolls and split or roll pulls the generation of accident.

Description

A method of improving high-strength IF steel rolling stability

Technical field

The present invention relates to a kind of methods improving high-strength IF steel rolling stability, belong to Cold Rolling technology neck Domain.

Background technology

With the high speed development of auto industry, to the quality of automobile steel, more stringent requirements are proposed, and high-strength IF steel is because of tool There are higher intensity and excellent deep drawability and is increasingly widely used.In smelter, high-strength IF steel generally use Five passage cold rollings of F1~F5 in the operation of rolling, since armor plate strength is larger, cause thickness fluctuation under tension-free state end to end It is larger, and in production process because intensity greatly caused by the common steel grade of its convexity ratio and deep punching steel it is big, and then in cold-rolled process, machine There is thickness fluctuation in easy waviness, strip between frame, lead to occur strip and roll to split or roll pulls accident, rolling is unstable.It is rolling During system, two level setting value that working roll and intermediate roll bending value, intermediate roll shifting value are safeguarded using producing line control system into Row automatic adjustment, and high-strength IF steel is controlled according to the two level setting value parameter of equality strength other steel grades, can not ensure to roll The stability of system.Through statistics, high-strength IF steel rolling deviation rate reaches 3.5%, while causing strip when bundling is sheared due to F4 machines Frame side wave is serious, causes F5 breast rollers to pull Frequent Accidents, causes strong influence to the stabilization of production, and then affect Business Economic Benefit.

Invention content

Technical problem to be solved by the invention is to provide a kind of methods improving high-strength IF steel rolling stability, pass through tune The work roll crown of whole high-strength IF steel rolling pressure distribution and F1~F3 racks is realized small curved power control in the operation of rolling, is increased Rolling stability is improved in roller parameter adjustment space, reduces rolling deviation rate.

In order to solve the above technical problems, the technical scheme is that：

A method of high-strength IF steel rolling stability is improved, is included the following steps：

Step 1: before being rolled, it is arranged as follows：Adjustment rolling pressure distribution, makes the absolute draft rate of F2 racks be The absolute draft rate of 80~85%, the F3 racks of F1 racks is the 50~55% of F1 racks；F1~F3 rack working rolls are selected with convex The working roll of degree, intermediate roll shifting value increase by 5~10% on the basis of two level setting value, the roller value control of working roll and intermediate calender rolls System is the 10%~30% of two level setting value；

Step 2: after being provided with according to step 1, using five passage cold rollings of F1~F5.

A kind of method of above-mentioned raising high-strength IF steel rolling stability, F1~F3 racks work roll crown be 50~ 75um, F1 working roll roughness are 1.0-1.2Ra/um.

Beneficial effects of the present invention are：

The present invention rolls pressure distribution by adjusting high-strength IF steel, reduces F1 racks and rolls reduction ratio, improves F2 and F3 racks and rolls Reduction ratio processed, F1~F3 working rolls use convexity type working roll, reduce the roller value of working roll and intermediate calender rolls, realize the operation of rolling Medium and small curved power control, and then roller parameter adjustment space is increased, it, can be rapidly into andante shape between operation of rolling rack after waviness Adjustment, can preferably ensure strip stable rolling, easy to operation, greatly reduce strip and roll and split or roll pulls accident Occur.

For the present invention after Handan Iron and Steel Co group cold rolling mill is implemented, rolling deviation rate reduces 91%, reaches 0.3%, to cold-rolled products Quality and steady production have prodigious effect, preferably resolve the bottleneck problem that sideslip is rolled when high-strength IF steel production.

Specific implementation mode

A kind of method improving high-strength IF steel rolling stability of the present invention carries out parameter adjustment and work before the rolling first Make roller selection, specially：

（1）Adjustment rolling pressure distribution, reduces F1 racks and rolls reduction ratio, improve F2 and F3 racks and roll reduction ratio, make F2 machines Frame absolute draft rate is the 80-85% of F1 racks, and F3 rack absolute draft rates are the 50-55% of F1 racks；

（2）It is the working roll of 50-75um that F1~F3 racks, which select convexity, and the roughness of F1 rack working rolls reaches 1.0-1.2Ra/ um；

（3）Intermediate roll shifting value increases 5-10% on the basis of two level setting value, and the roller value control of working roll and intermediate calender rolls is two The 10%-30% of grade setting value.

After completing above-mentioned parameter adjustment setting, using five subnormal cold rollings of F1~F5.

The present invention will be further described by the following examples：

Embodiment 1：In production high-strength IF steel, trade mark HC250IF, raw thickness 2.8mm, finished product thickness 0.8mm, trim width When spending 1500mm, it is as shown in table 1 to adjust its rolling pressure distribution：

Table 1

Rack	F1 racks	F2 racks	F3 racks	F4 racks	F5 racks
						Absolute draft rate %	38.1	30.2	20.5	10.4	0.8

F1~F3 uses the working roll that convexity is 50-75um, F1 working roll roughness control to 1.0-1.2Ra/um.

Intermediate roll shifting is set as the 105% of two level setting value, specific as shown in table 2：

Table 2

The control of the roller value of working roll and intermediate calender rolls is rolled, specifically such as the 10%~30% of two level setting value using small bending roller force Shown in table 3, table 4：

Table 3

Table 4

It is distributed by adjusting pressure, the method rolled using small bending roller force, when side wave occurs in rack, work roll bending adjustment is empty Between it is sufficient, can rapidly be adjusted into andante shape, realize the stabilization of rolling.

Embodiment 2：Production high-strength IF steel, trade mark HC250IF, raw thickness 3.3mm, finished product thickness 1.2mm, at When product width 1500mm, it is as shown in table 5 to adjust its rolling pressure distribution：

Table 5

Rack	F1 racks	F2 racks	F3 racks	F4 racks	F5 racks
						Absolute draft rate %	37.3	31.5	18.9	11.3	1.0

F1~F3 uses the working roll that convexity is 50-75um, F1 working roll roughness control to 1.0-1.2Ra/um.

Intermediate roll shifting is set as the 105% of two level setting value, specific as shown in table 6：

Table 6

The control of the roller value of working roll and intermediate calender rolls is rolled, specifically such as the 10%~30% of two level setting value using small bending roller force Shown in table 7, table 8：

Table 7

Table 8

It is distributed by adjusting pressure, the method rolled using small bending roller force, when side wave occurs in rack, work roll bending adjustment is empty Between it is sufficient, can rapidly be adjusted into andante shape, realize the stabilization of rolling.

Embodiment 3：Production high-strength IF steel, trade mark HC250IF, raw thickness 4.3mm, finished product thickness 1.4mm, at When product width 1500mm, it is as shown in table 9 to adjust its rolling pressure distribution：

Table 9

Rack	F1 racks	F2 racks	F3 racks	F4 racks	F5 racks
						Absolute draft rate %	36.2	29.8	18.4	14.4	1.2

F1~F3 uses the working roll that convexity is 50-75um, F1 working roll roughness control to 1.0-1.2Ra/um.

Intermediate roll shifting is set as the 105% of two level setting value, specific as shown in table 10：

Table 10

The control of the roller value of working roll and intermediate calender rolls is rolled, specifically such as the 10%~30% of two level setting value using small bending roller force Shown in table 11, table 12：

Table 11

Table 12

It is distributed by adjusting pressure, the method rolled using small bending roller force, when side wave occurs in rack, work roll bending adjustment is empty Between it is sufficient, can rapidly be adjusted into andante shape, realize the stabilization of rolling.

After the present invention is implemented, it can effectively ensure that the stable rolling of high-strength IF steel, adjustment high-strength IF steel rolling pressure distribute, It is the 50~55% of F1 racks to make the absolute draft rate that the absolute draft rate of F2 racks is 80~85%, the F3 racks of F1 racks；F1- F3 working rolls use convexity type working roll, realize small curved power control in the operation of rolling, and then increase work roll bending parameter tune Whole space between operation of rolling rack after waviness, can adjust rapidly into andante shape, can preferably ensure strip stable rolling, It is easy to operation, it greatly reduces strip and rolls and split or roll pulls the generation of accident.High-strength IF steel rolls deviation rate from 3.5% drop As low as 0.3%, there is prodigious effect to cold-rolled products quality and steady production, is rolled when preferably resolving high-strength IF steel production The bottleneck problem of sideslip processed.

Claims (2)

1. a kind of method improving high-strength IF steel rolling stability, it is characterised in that：Include the following steps：

Step 1: before being rolled, it is arranged as follows：Adjustment rolling pressure distribution, makes the absolute draft rate of F2 racks be The absolute draft rate of 80~85%, the F3 racks of F1 racks is the 50~55% of F1 racks；F1~F3 rack working rolls are selected with convex The working roll of degree, intermediate roll shifting value increase by 5~10% on the basis of two level setting value, the roller value control of working roll and intermediate calender rolls System is the 10%~30% of two level setting value；

Step 2: after being provided with according to step 1, using five passage cold rollings of F1~F5.

2. a kind of method improving high-strength IF steel rolling stability as described in claim 1, it is characterised in that：F1~the F3 Rack work roll crown is 50~75um, and F1 working roll roughness is 1.0-1.2Ra/um.