CN103599939B - A kind of for the backing roll of hot rolling 2250 skin pass mill group and the method for designing of body of roll roll forming thereof - Google Patents
A kind of for the backing roll of hot rolling 2250 skin pass mill group and the method for designing of body of roll roll forming thereof Download PDFInfo
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- CN103599939B CN103599939B CN201310629067.7A CN201310629067A CN103599939B CN 103599939 B CN103599939 B CN 103599939B CN 201310629067 A CN201310629067 A CN 201310629067A CN 103599939 B CN103599939 B CN 103599939B
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- roll
- contact area
- backing
- hot rolling
- skin pass
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Abstract
The invention discloses a kind of backing roll for hot rolling 2250 skin pass mill group, comprise and be positioned at the middle body of roll and the roll neck of both sides, the body of roll comprises and is positioned at rolling zone and harmful contact area, rolling zone roll forming is straightway, the roll forming of the harmful contact area of both sides is the VCR curve of parabolically shape, and two VCR curves are respectively initial point and X-axis with body of roll mid point and axis, be that symmetry axis is symmetrically distributed in body of roll two ends with Y-axis.For a body of roll roll contour design method for the backing roll of hot rolling 2250 skin pass mill group, step is as follows: one, working roll is plain-barreled roll; Two, the overall convexity of the body of roll is determined; Three, determine that the body of roll plays curved position and mid point distance; Four, the VCR roll shape curve model of harmful contact area is determined; Five, body of roll global shape is determined.The present invention have reduce harmful contact area, improve roller effect, contact pressure between rolls is evenly distributed, improve strip shape quality, working roll consumes little feature, can be widely used in hot continuous rolling planarizing technique field.
Description
Technical field
The present invention relates to hot continuous rolling planarizing technique field, particularly relate to a kind of for the backing roll of hot rolling 2250 skin pass mill group and the method for designing of body of roll roll forming thereof.
Background technology
In recent years, domestic steel mill develops high strength Thin Specs hot-rolled band one after another to replace import band, as fields such as high-strength engineering machinery steel, high-strength vehicle structural steel, high-strength mining structural steel, high-strength abrasion-proof steel, high-level hull steels.Formation process due to band relies on roll to carry out, and therefore the body of roll shape of roll directly affects the plate shape of band, relates to the technical barriers such as flat strip strip shape quality, surface quality, working roll roller consumption and associated regulatory thus.
In order to produce better plate shape, domestic many steel mills have introduced hot rolling 2250 skin pass mill group from Mino S.P.A.Compared to domestic traditional hot-leveling machine, hot rolling 2250 skin pass mill group adopts lower support roll transmission, its working roll " draw ratio " is maximum, the step of upper and lower working roll is antisymmetry structure, maximum, the smooth intensity of the longest, the smooth strip width of domestic current body of roll hot-rolled leveling unit high and the most few in number, this unit possesses ± and 200mm Long travel roll shifting function is for international pioneering.The roll system structure of hot rolling 2250 skin pass mill group as shown in Figure 1, comprise the backing roll (￠ 1100mm) and working roll 3(￠ 550mm that are made up of the body of roll 1 of centre and the roll neck 2 of both sides), described backing roll and working roll 3 are plain-barreled roll, for needing the winding 4 of rolling between upper and lower two working rolls 3.
Because planisher deflection is little, roll-force is little, Strip Shape Control is limited in one's ability, simultaneously the means (roll forming adds roller) of Strip Shape Control are more single, therefore formulate rational roll system arrangement scheme for improving flattening process, improve strip shape quality, improve the list of working roll 3 and overlap smooth measurer and have realistic meaning.Simultaneously, along with market is to the continuous increase of the high strength steel grade demand of various uses and specification, user requires also improving constantly to steel plate flatness and rolled steel plate shape, and this all depends on higher strip shape quality, and the basis of strip shape quality is rational roll contour design scheme.
But because working roll 3 draw ratio of hot rolling 2250 skin pass mill group is comparatively large, hydraulic bending roll only can have influence on winding 4 Edge shape, causes Strip Shape Control effect unsatisfactory, causes working roll 3 serious wear, consumes larger simultaneously.Can say, the expection object improving strip shape quality can not reached only by the Normal practice changing shape of working roll on hot rolling 2250 skin pass mill group.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of backing roll for hot rolling 2250 skin pass mill group is provided, make it have reduce harmful contact area, improve roller effect, the excessive deflection reducing working roll, contact pressure between rolls be evenly distributed, improve strip shape quality, working roller abrasion and consume little feature.
A kind of backing roll for hot rolling 2250 skin pass mill group provided by the invention, comprise and be positioned at the middle body of roll and the roll neck of both sides, the described body of roll comprises and is positioned at middle rolling zone and the harmful contact area of both sides, described rolling zone roll forming is straightway, the roll forming of the harmful contact area of both sides is the VCR curve of parabolically shape, and two VCR curves are respectively initial point and X-axis with body of roll mid point and axis, be that symmetry axis is symmetrically distributed in body of roll two ends with Y-axis.
In technique scheme, the roll forming equation of described harmful contact area is P=b
1x
2+ b
2x
4+ b
3x
8, in described equation: b
1span is at-135 ~-165, b
2span is at-135 ~-165, b
3span is-750 ~-850.
In technique scheme, the roll forming equation of described harmful contact area is P=-150X
2-150X
4-800X
8.
The body of roll roll contour design method of a kind of backing roll for hot rolling 2250 skin pass mill group provided by the invention, comprises the steps: one, working roll is plain-barreled roll; Two, determine the overall convexity of the backing roll body of roll, require the convexity of the body of roll and smooth time the roll thermal crown that produces and supplied materials strip crown match, and reduce flatness defect by the regulating action of roller; Three, the distance playing curved position and mid point of the backing roll body of roll is determined; Four, determine the tracing pattern of Qi Wan position, body of roll two ends to end, obtain the VCR roll shape curve model of backing roll harmful contact area; Five, determine the global shape of the backing roll body of roll, determine grinding coordinate, curve plotting figure.
In technique scheme, the roll forming equation of described harmful contact area is P=b
1x
2+ b
2x
4+ b
3x
8, in described equation: b
1span is at-135 ~-165, b
2span is at-135 ~-165, b
3span is-750 ~-850.
In technique scheme, the roll forming equation of described harmful contact area is P=-150X
2-150X
4-800X
8.
The present invention is the propelling along with R&D work, consider the expection object that can not reach raising strip shape quality only by the Normal practice changing shape of working roll on hot rolling 2250 skin pass mill group, sight has been turned to the VCR(VaryingContact-lengthbackupRoll of cold continuous rolling skin pass mill group by applicant, variable contact length backing roll) backing roll technology, to therefrom gaining enlightenment and using for reference.And the effect of VCR method for designing comprises: under roll-force effect, the contact line length between backing roll and working roll and rolling width are adapted to automatically, realizes variable contact; Larger harmful contact area (contact wire namely between working roll and backing roll exceeds the part beyond winding width) this difficult problem is there is for hot rolling 2250 skin pass mill group backing roll, this method for designing adopts the roll shape curve of particular design, effects such as making it automatically to adapt with winding width, there is reduction harmful contact area, improve roller effect, reduce working roll 3 excessive deflection, contact pressure between rolls is evenly distributed.
Suppose to exist be respectively initial point and X-axis with body of roll mid point and axis, be the ideal curve roll forming that symmetry axis is distributed in the harmful contact area at body of roll two ends with Y-axis, this curve should be even Multivariate Curve equation, under actual rolling stress state, this curve should be able to change backing roll stress distribution, make backing roll stress distribution even, this desirable backing roll curvilinear equation is: P=a
0+ a
2x
2+ a
4x
4+ a
6x
6+ a
8x
8.
Because in production practices, backing roll life cycle is longer, and affect the process conditions more complicated of supporting roller abrasion, statistical regression is carried out more difficult by a large amount of measured data, and recurrence calculating equation of higher degree coefficient exists great difficulty equally, the approximation coefficient value of equation need be solved by decomposition analysis method.
In hot rolling technology, strip shape quality is directly determined by body of roll roll forming, and the factor affecting roll forming is a lot, as body of roll temperature, grinding accuracy, smooth duration and incoming profile etc., a curved position (position that namely body of roll straightway is crossing with curved section) of the body of roll also directly has influence on the abrasion condition of the body of roll simultaneously.Take above factor into consideration, on the basis of a large amount of periodic test, determine the backing roll roll forming of hot rolling 2250 skin pass mill group
The present invention is used for the backing roll of hot rolling 2250 skin pass mill group, there is following beneficial effect: after adopting the backing roll roll forming that the present invention relates to, the smooth amount of hot rolling 2250 skin pass mill group is greatly improved, smooth amount in single cover working roll period of service rises to more than 1800 tons by about 1100 before ton, extend the service life of working roll simultaneously, roller regulating power has also brought up to 60% from 20% of the past, and the degree of wear of working roll is significantly improved.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art hot rolling 2250 skin pass mill group roller system;
Fig. 2 is the roll forming schematic diagram of the present invention for the backing roll of hot rolling 2250 skin pass mill group.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail, but this embodiment should not be construed as limitation of the present invention.
The present invention is used for the backing roll of hot rolling 2250 skin pass mill group, comprise and be positioned at the middle body of roll 1 and the roll neck 2 of both sides, the described body of roll 1 comprises and is positioned at middle rolling zone 1.1 and the harmful contact area 1.2 of both sides, and described rolling zone 1.1 roll forming is straightway, and the axial length of the described body of roll 1 is 2200mm.
See Fig. 2, the roll forming of the harmful contact area 1.2 of both sides is the VCR curve of parabolically shape, and two VCR curves are respectively initial point and X-axis with the body of roll 1 mid point and axis, be that symmetry axis is symmetrically distributed in the body of roll 1 two ends with Y-axis.The roll forming equation of described VCR curve is P=b
1x
2+ b
2x
4+ b
3x
8, wherein, b
1value is at-135 ~-165, b
2value is at-135 ~-165, b
3value is-750 ~-850; Be preferably P=-150X
2-150X
4-800X
8.
The body of roll roll contour design method of the backing roll of hot rolling 2250 skin pass mill group, comprises the steps:
One, the working roll 3 of hot rolling 2250 skin pass mill group is plain-barreled roll;
Two, determine the overall convexity of the backing roll body of roll 1, require the convexity of the body of roll 1 and smooth time the roll thermal crown that produces and supplied materials strip crown match, and reduced to greatest extent by the regulating action of roller and even eliminate flatness defect;
Three, determine the distance playing curved position and mid point of the backing roll body of roll 1, reduce the harmful contact area 1.2 in the body of roll 1 production process to greatest extent;
Four, determine the tracing pattern of Qi Wan position, both sides to the body of roll 1 end, by a large amount of periodic tests, obtain the VCR roll shape curve model of backing roll harmful contact area 1.2: P=-150X
2-150X
4-800X
8, to reduce the wearing and tearing of the backing roll body of roll 1;
Five, determine the global shape of the backing roll body of roll 1, determine grinding coordinate (as shown in Table 1), curve plotting figure (as shown in Figure 2), hand over grinding machine processing.
The effect of VCR method for designing comprises: under roll-force effect, the contact line length between backing roll and working roll 3 and rolling width is adapted to automatically, realizes variable contact; The part beyond winding 4 width is exceeded for the hot rolling 2250 skin pass mill group backing roll larger harmful contact area 1.2(of existence and the contact wire between working roll 3 and backing roll) this difficult problem, this method for designing adopts the roll shape curve of particular design, effects such as making it automatically to adapt with winding 4 width, there is reduction harmful contact area 1.2, improve roller effect, reduce working roll 3 excessive deflection, contact pressure between rolls is evenly distributed.
The harmful contact area curve desired data of the backing roll body of roll of hot rolling 2250 skin pass mill group drawn by table one
| Body of roll coordinate (mm) | Semidiameter (mm) | Body of roll coordinate (mm) | Semidiameter (mm) |
| -1100 | -0.3 | 50 | 0 |
| -1050 | -0.2644 | 100 | 0 |
| -1000 | -0.2266 | 150 | 0 |
| -950 | -0.193 | 200 | 0 |
| -900 | -0.1586 | 250 | 0 |
| -850 | -0.124 | 300 | 0 |
| -800 | -0.0912 | 350 | 0 |
| -750 | -0.07 | 400 | -0.002 |
| -700 | -0.0536 | 450 | -0.006 |
| -650 | -0.0398 | 500 | -0.012 |
| -600 | -0.0286 | 550 | -0.0194 |
| -550 | -0.0194 | 600 | -0.0286 |
| -500 | -0.012 | 650 | -0.0398 |
| -450 | -0.006 | 700 | -0.0536 |
| -400 | -0.002 | 750 | -0.07 |
| -350 | 0 | 800 | -0.0912 |
| -300 | 0 | 850 | -0.124 |
| -250 | 0 | 900 | -0.1586 |
| -200 | 0 | 950 | -0.193 |
| -150 | 0 | 1000 | -0.2266 |
| -100 | 0 | 1050 | -0.2644 |
| -50 | 0 | 1100 | -0.3 |
| 0 | 0 |
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
The content be not described in detail in this description belongs to the known prior art of professional and technical personnel in the field.
Claims (4)
1. the backing roll for hot rolling 2250 skin pass mill group, comprise and be positioned at the middle body of roll (1) and the roll neck (2) of both sides, the described body of roll (1) comprises and is positioned at middle rolling zone (1.1) and the harmful contact area (1.2) of both sides, described rolling zone (1.1) roll forming is straightway, it is characterized in that: the roll forming of the harmful contact area (1.2) of both sides is the VCR curve of parabolically shape, article two, VCR curve is respectively initial point and X-axis with the body of roll (1) mid point and axis, be that symmetry axis is symmetrically distributed in the body of roll (1) two ends with Y-axis, the roll forming equation of described harmful contact area (1.2) is P=b
1x
2+ b
2x
4+ b
3x
8, in described equation: b
1span is at-135 ~-165, b
2span is at-135 ~-165, b
3span is-750 ~-850.
2. the backing roll for hot rolling 2250 skin pass mill group according to claim 1, is characterized in that: the roll forming equation of described harmful contact area (1.2) is P=-150X
2-150X
4-800X
8.
3., as claimed in claim 1 for a body of roll roll contour design method for the backing roll of hot rolling 2250 skin pass mill group, it is characterized in that: comprise the steps:
One, working roll (3) is plain-barreled roll;
Two, determine the overall convexity of the backing roll body of roll (1), require the convexity of the body of roll (1) and smooth time the roll thermal crown that produces and supplied materials strip crown match, and reduce flatness defect by the regulating action of roller;
Three, the distance playing curved position and mid point of the backing roll body of roll (1) is determined;
Four, determine the tracing pattern of Qi Wan position, the body of roll (1) two ends to end, obtain the VCR roll shape curve model of backing roll harmful contact area: the roll forming equation of described harmful contact area (1.2) is P=b
1x
2+ b
2x
4+ b
3x
8, in described equation: b
1span is at-135 ~-165, b
2span is at-135 ~-165, b
3span is-750 ~-850;
Five, determine the global shape of the backing roll body of roll (1), determine grinding coordinate, curve plotting figure.
4. the body of roll roll contour design method of the backing roll for hot rolling 2250 skin pass mill group according to claim 3, is characterized in that: the roll forming equation of described harmful contact area (1.2) is P=-150X
2-150X
4-800X
8.
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|---|---|---|---|
| CN201310629067.7A CN103599939B (en) | 2013-11-29 | 2013-11-29 | A kind of for the backing roll of hot rolling 2250 skin pass mill group and the method for designing of body of roll roll forming thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310629067.7A CN103599939B (en) | 2013-11-29 | 2013-11-29 | A kind of for the backing roll of hot rolling 2250 skin pass mill group and the method for designing of body of roll roll forming thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103599939A CN103599939A (en) | 2014-02-26 |
| CN103599939B true CN103599939B (en) | 2016-04-13 |
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| CN105728467B (en) * | 2016-05-10 | 2017-07-11 | 广东韶钢松山股份有限公司 | A kind of roller shape technique for Medium and Heavy Plate Rolling |
| CN113732066A (en) * | 2021-08-31 | 2021-12-03 | 国核宝钛锆业股份公司 | Support roller suitable for rolling nuclear power zirconium alloy plate strip and roll shape processing method |
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| JPS5739006A (en) * | 1980-08-21 | 1982-03-04 | Ishikawajima Harima Heavy Ind Co Ltd | Four-stage mill |
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| CN101554635A (en) * | 2009-05-18 | 2009-10-14 | 首钢总公司 | Method for configuring shape of supporting roll of four-high mill and shape of working roll thereof |
| CN101716608A (en) * | 2009-12-30 | 2010-06-02 | 首钢总公司 | Plate shape control method of hot rolling thin checkered plates |
| CN101837369A (en) * | 2009-03-17 | 2010-09-22 | 上海梅山钢铁股份有限公司 | Roller of four-high rougher |
| CN101890429A (en) * | 2010-07-22 | 2010-11-24 | 首钢总公司 | Complete roll forming configuring method for wide flat steel hot rolling finish mill set |
| CN102009067A (en) * | 2010-10-18 | 2011-04-13 | 北京科技大学 | Configuration method of medium and heavy plate roll system with consideration of both rolling stability and cross-section shape |
-
2013
- 2013-11-29 CN CN201310629067.7A patent/CN103599939B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5739006A (en) * | 1980-08-21 | 1982-03-04 | Ishikawajima Harima Heavy Ind Co Ltd | Four-stage mill |
| CN101229560A (en) * | 2008-01-30 | 2008-07-30 | 武汉钢铁(集团)公司 | Continuous variational convexity degree rolling mill back-up shaft |
| CN101837369A (en) * | 2009-03-17 | 2010-09-22 | 上海梅山钢铁股份有限公司 | Roller of four-high rougher |
| CN101554635A (en) * | 2009-05-18 | 2009-10-14 | 首钢总公司 | Method for configuring shape of supporting roll of four-high mill and shape of working roll thereof |
| CN101716608A (en) * | 2009-12-30 | 2010-06-02 | 首钢总公司 | Plate shape control method of hot rolling thin checkered plates |
| CN101890429A (en) * | 2010-07-22 | 2010-11-24 | 首钢总公司 | Complete roll forming configuring method for wide flat steel hot rolling finish mill set |
| CN102009067A (en) * | 2010-10-18 | 2011-04-13 | 北京科技大学 | Configuration method of medium and heavy plate roll system with consideration of both rolling stability and cross-section shape |
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