CN102728659A - Roll gap of multi-roll straightener - Google Patents
Roll gap of multi-roll straightener Download PDFInfo
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- CN102728659A CN102728659A CN2012102057128A CN201210205712A CN102728659A CN 102728659 A CN102728659 A CN 102728659A CN 2012102057128 A CN2012102057128 A CN 2012102057128A CN 201210205712 A CN201210205712 A CN 201210205712A CN 102728659 A CN102728659 A CN 102728659A
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Abstract
The invention discloses a roll gap of a multi-roll straightener, and belongs to the technical field of steel plate straightening. The roll gap equation of a third straightening roll is: k = 1+p-p2/2; R=E.t.(1-p)/sigmas, wherein E represents the elasticity modulus of the strip steel, t represents the thickness of the strip steel; and sigmas represents the yield strength of the strip steel, and p represents the proportion of the plastically deforming area in the cross section of the strip steel in a thickness direction. The roll gap is applicable to development of on-line control models. The models developed by using the roll gap are simple and practical; and when the roll gap is used, the residual stress in the strip steel can be eliminated effectively, the quality of the strip profile of the strip steel can be improved, the bearing capacity of the equipment can be lowered, and economic benefits can be increased.
Description
Technical field
The invention belongs to steel plate straightening technology field, relate to a kind of multi-roll straightening machine roll gap.
Background technology
Strip product after the hot rolling usually can produce the different shape defective, for improving plate shape, alleviates residualinternal stress, must realize that to the elastic and plastic deformation process of being with steel strip is straight through straightener.Straightening technology is used for the back step operation of sheet metal processing more, and especially the finishing aligning is a final operation of fundamentally improving plate shape, has determined the final mass level of product.Roll leveller is widely used in aligning the metal plates and strips of all size, various materials, and strip is the roller through being staggered and rotating continuously, obtains repeatedly reverse repeatedly bending.If the adjustment of smoothing roll roll gap suitably; Can make the different original curvatures of rolled piece become the curvature of homogeneous rapidly, gradually with the rolled piece leveling, straightener is aligned rationally confirming of scheme; Not only can correct rolled piece effectively; Make rolled piece straight, strip shape quality improves, and the bearing capacity that can reduce equipment with increase economic efficiency.Therefore, equipment for straightening has become the finishing unit to guarantee the key equipment of product quality, and intermesh determination then is the technology of straightener most critical.
There are complicated relation in the roll gap of straightener and belt steel thickness, material; Just because of these complicated relation and non-linear factor; People often confirm the roll gap under the different operating modes with the method for commerical test; And, generally set operation roll gap parameter according to the rules look-up method according to result of the test formulation production operation rules.At present, in the strip aligning was produced, the setting of straightening process and optimization also still mainly relied on operative employee self experience.Prior art discloses a kind of metal plate and belt automatic flattening parameter optimizing method; A kind of straightening process optimization method is provided; Carry out the minimum optimization processing according to the calculated value of straightening force and the difference of measured value; Revise the coefficient in the straightening force theoretical calculation formula, make the calculated value of straightening force and measured value the most approaching, directly do not provide straightener roll gap computation model.At present, domestic conventional straightener is that up and down the whole row of smoothing roll tilts and level is depressed adjusting, seldom has single smoothing roll can depress setting, and this has brought restrictive condition for aligning elimination residual stress.The straightener of last row's smoothing roll integral inclination adjustment is moulded the district than reaching more than 75% in order to make the band distortion, and the drafts of inlet is big, and straightener load is big, and, the steel grade of more corresponding specifications and intensity, capacity of equipment also is difficult to satisfy above-mentioned requirements.Existing document give the straightener that row's smoothing roll integral inclination depresses the i roller depress computing formula, still, band steel original curvature is difficult to confirm, is difficult to practical application.Depress the intermesh determination model of formula ten three-roll unbenders for integral level, only be applicable to that integral level depresses pattern.Simultaneously, prior art has provided the computation model of five-roll machine inclination setting roll gap, confirms the entrance and exit roll gap respectively, and the outlet roll gap has just provided a scope.Just smoothing roll integral type level that above-mentioned document provides or the intermesh determination computation model that tilts to depress; Just carry out set-up and calculated to eliminating band steel length direction curvature; Rather than to arrive about 80% according to the plastically deforming area ratio and calculate; Simultaneously, also be not suitable for the intermesh determination method of the straightener that novel smoothing roll can the independent regulation roll gap.Up-to-date straightener can realize that smoothing roll depresses setting separately, eliminates the band residual stress of steel to straightener advantage is provided, and still, how carrying out the smoothing roll intermesh determination is difficult point.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of multi-roll straightening machine roll gap, be suitable for the roll gap of the multi-roll straightening machine that smoothing roll can dull set, can effectively eliminate the band residual stress of steel, guarantee strip shape quality.
A kind of multi-roll straightening machine roll gap, the band steel passes through staggered smoothing roll up and down continuously, and the roll gap equation of the 3rd smoothing roll is following:
k＝1+p-p
2/2；
R＝E·t·(1-p)/σ
s；
In the formula, E is the elastic modelling quantity of said band steel, and t is that thickness, the σ s of said band steel is the yield strength of said band steel, and p is the plastically deforming area ratio on the said belt steel thickness cross section.
Further, said p is 75%-80%.
Further, the roll gap S of first smoothing roll of said multiple roll smoothing roll
1=S
3-2 (S
3-t)/(n-3);
In the formula, S
1Be the roll gap of said first smoothing roll, S
3Be the roll gap of the 3rd smoothing roll, t is the thickness of said band steel, and n is the smoothing roll number of said multi-roll straightening machine.
Further, the 5th smoothing roll roll gap S of said multiple roll smoothing roll
5To said outlet smoothing roll roll gap S
nIncrease successively.
Further, the outlet smoothing roll roll gap S of said multiple roll smoothing roll
nBe belt steel thickness value t.
A kind of multi-roll straightening machine roll gap provided by the invention; Be applicable to online control model exploitation usefulness, model is simple and practical, not only can eliminate band steel internal residual stress effectively; Make the belt plate shape quality improve, the bearing capacity that reduces equipment simultaneously with increase economic efficiency.
Description of drawings
A kind of multi-roll straightening machine roll gap sketch map that Fig. 1 provides for the embodiment of the invention;
Band steel BENDING PROCESS internal stress diagram of strains in a kind of multi-roll straightening machine roll gap that Fig. 2 provides for the embodiment of the invention;
Fig. 3 is the vertical cutting sketch map of band steel in a kind of multi-roll straightening machine roll gap;
Fig. 4 is band residual stress of steel test result figure in a kind of multi-roll straightening machine roll gap;
Reference numeral "
1, first smoothing roll, 2, second smoothing roll, the 3, the 3rd smoothing roll, the 4, the 4th smoothing roll, the 5, the 5th smoothing roll; 6, the 6th smoothing roll, the 7, the 7th smoothing roll, the 8, the 8th smoothing roll, the 9, the 9th smoothing roll; 10, the tenth smoothing roll, 11, the 11 smoothing roll, S1, the first smoothing roll roll gap, S
3, the 3rd smoothing roll roll gap, S
5, the 5th smoothing roll roll gap, S
7, the 7th smoothing roll roll gap, S
9, the 9th smoothing roll roll gap, S
11, the 11 smoothing roll roll gap.
The specific embodiment
Before high-strength plate aligning, at first carry out smooth and annealing in process, production cost is higher.For the better crosscut plate strip shape quality of the control high-strength steel and the deck of boat, Shoudu Iron and Steel Co moves steel and accomplished in 2010 to know clearly and one overlap the construction of crosscut production line and put into production.Shoudu Iron and Steel Co moves steel company hot-strip multi-roll straightening machine group to be made up of slightly strong machine of 7 rollers and the smart machine of rectifying of 11 rollers, and equipment is manufactured and designed by western mark.Device structure has level, front and back inclination, transverse curvature and following smoothing roll and regulates functions such as roll gap separately.Following smoothing roll is independent adjustable, and the adjusting through an electronics Adjustment System reaches required aligning roll gap.Roll gap is set according to parameters such as thickness of slab, the strengths of materials.
Straightener can the straightening steel plate specification:
Belt steel thickness: 5～25.4mm;
Strip width: 800～2130mm;
The strength of materials can reach 1000MPa (tensile strength).
Smart strong machine is the key link of production line, is last procedure of eliminating band steel internal residual stress, needs accurately setting straightener roll gap.Smart strong machine of 11 rollers and intermesh determination mode thereof are as shown in Figure 1, are respectively first smoothing roll, 1, the second smoothing roll, 2, the three smoothing rolls 3; The 4th smoothing roll 4, the five smoothing rolls 5, the six smoothing rolls 6, the seven smoothing rolls 7; The 8th smoothing roll 8, the nine smoothing rolls 9, the ten smoothing rolls 10; The 11 smoothing roll 10, strip be the roller through being staggered and rotating continuously, obtains repeatedly reverse repeatedly bending.The band steel is a symmetry with the neutral surface in BENDING PROCESS, at thickness direction, has plastically deforming area and elastic deformation area, and upper and lower surface strain is maximum, and is as shown in Figure 2.The straightener roll of straightener diameter is 220mm, and the roller spacing is 230mm, and upper straightening roll quantity is 5, and following smoothing roll quantity is 7.Last row's smoothing roll keeps level, and following smoothing roll can carry out vertical direction separately and move, and sets roll gap separately.Roll gap is followed successively by, the first smoothing roll roll gap S1, the 3rd smoothing roll roll gap S
3, the 5th smoothing roll roll gap S
5, the 7th smoothing roll roll gap S
7, the 9th smoothing roll roll gap S
9, the 11 smoothing roll roll gap S
11, roll gap S definition: the range difference of following smoothing roll roll surface and upper straightening roll roll surface, as shown in Figure 1, following smoothing roll is above the situation of upper straightening roll roll surface, roll gap is defined as negative value, otherwise be on the occasion of.
At first set the roll gap S of the 3rd smoothing roll
3, make the band steel crooked maximum at the 3rd roller place, the plastically deforming area ratio p on the belt steel thickness cross section reaches 75%-80%.
k＝1+p-p
2/2
R＝E·t·(1-p)/σ
s
In the formula, E is band steel bomb property modulus, and t is thickness, the σ of band steel
sBe the yield strength of band steel, p is the plastically deforming area ratio on the belt steel thickness cross section.
Wherein, the roll gap S of first smoothing roll
1, be set at S
3-2 (S
3-t)/(n-3), and given then roll gap from the 5th smoothing roll to the outlet smoothing roll, roll gap increases successively, presents the trend of opening, outlet smoothing roll roll gap S
nBe set at belt steel thickness value t, suc as formula shown in, S
5<s
7<... S
N-1<s
n=t.
The present invention uses steel SQ700MCC to be example with the hot rolling high-strength engineering machines, and above-mentioned model specification result of calculation is described.Thickness and width specifications are respectively 7mm and 1270mm.Plastically deforming area ratio when setting on the thickness section maximum distortion in the aligning process is 80%, and the elastic modelling quantity of setting steel is 210GPa.According to above-mentioned setting principle, set the roll gap S of the 3rd smoothing roll
3For-13.34mm, the roll gap S of the 1st smoothing roll that enters the mouth
1Be 1.88mm, the roll gap S of outlet smoothing roll
11For belt steel thickness 7mm, from S
5To S
9Increase roll gap successively.The concrete set-up and calculated result of roll gap of smoothing roll is as follows under all:
S
1＝1.88mm；
S
3＝-13.34mm；
S
5＝-2.78mm；
S
7＝2.36mm；
S
9＝3.46mm；
S
11＝7.00mm。
Steel plate to behind the aligning is taken a sample, and sample length is 2m.Adopt vertical slitting method to carry out the residual stress test, and carried out Calculation of Residual according to the cutting measurement result.Cutting and measuring method are as shown in Figure 3, suppose that steel plate along the rolling centerline symmetry, carries out rip cutting to half-breadth steel plate partly, and each fillet is 100mm.After the cutting, the lateral bending amount of each fillet is measured, based on lateral bending measurement amount result, calculated residual stress along distribution in the plate half-breadth scope and concrete numerical value, concrete outcome as shown in Figure 4.From Fig. 4, can find out that residual stress distribution is even, strip shape quality is good, satisfies user's instructions for use.
The present invention is applicable to that smoothing roll can the dull straightener of regulating roll gap, not only can eliminate band steel internal residual stress effectively, makes the belt plate shape quality improve, the bearing capacity that reduces equipment simultaneously with increase economic efficiency.
It should be noted last that; The above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to instance the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. a multi-roll straightening machine roll gap is with steel to pass through staggered smoothing roll up and down continuously, it is characterized in that the roll gap equation of the 3rd smoothing roll is following:
k＝1+p-p
2/2；
R＝E·t·(1-p)/σ
s；
In the formula, E is the elastic modelling quantity of said band steel, and t is thickness, the σ of said band steel
sBe the yield strength of said band steel, p is the plastically deforming area ratio on the said belt steel thickness cross section.
2. roll gap according to claim 1 is characterized in that, said p is 75%-80%.
3. roll gap according to claim 1 is characterized in that, the roll gap S of first smoothing roll of said multiple roll smoothing roll
1=S
3-2 (S
3-t)/(n-3);
In the formula, S
1Be the roll gap of said first smoothing roll, S
3Be the roll gap of the 3rd smoothing roll, t is the thickness of said band steel, and n is the smoothing roll number of said multi-roll straightening machine.
4. roll gap according to claim 1 is characterized in that, the 5th smoothing roll roll gap S of said multiple roll smoothing roll
5To said outlet smoothing roll roll gap S
nIncrease successively.
5. roll gap according to claim 4 is characterized in that, the outlet smoothing roll roll gap S of said multiple roll smoothing roll
nBe belt steel thickness value t.
Priority Applications (1)
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|---|---|---|---|
| CN2012102057128A CN102728659A (en) | 2012-06-18 | 2012-06-18 | Roll gap of multi-roll straightener |
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|---|---|---|---|
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Family
ID=46985356
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974661A (en) * | 2012-12-17 | 2013-03-20 | 南京钢铁股份有限公司 | Straightening process of corrosion-resistant steel sheet of cargo oil tank of crude oil carrier |
| CN104209373A (en) * | 2014-08-18 | 2014-12-17 | 南京钢铁股份有限公司 | Multi-pass curvature decreasing straightening technology |
| CN104550327A (en) * | 2014-12-19 | 2015-04-29 | 秦皇岛首秦金属材料有限公司 | Medium-thick plate hot straightening machine roller seam setting method based on plastic deformation rate |
| CN104668313A (en) * | 2015-01-30 | 2015-06-03 | 燕山大学 | Roller gap adjustment method of seven-roller thick plate straightener |
| CN109500298A (en) * | 2018-12-07 | 2019-03-22 | 中冶建筑研究总院有限公司 | A kind of use for laboratory high intensity round straightener and method for aligning |
| CN113617843A (en) * | 2021-09-14 | 2021-11-09 | 鞍钢股份有限公司 | Method for eliminating residual stress of hot-rolled strip steel at high temperature |
| CN113941606A (en) * | 2021-09-26 | 2022-01-18 | 中冶南方工程技术有限公司 | Small-time lag control method for cold-rolling full-hydraulic multi-roller straightening roll gap |
-
2012
- 2012-06-18 CN CN2012102057128A patent/CN102728659A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974661A (en) * | 2012-12-17 | 2013-03-20 | 南京钢铁股份有限公司 | Straightening process of corrosion-resistant steel sheet of cargo oil tank of crude oil carrier |
| CN102974661B (en) * | 2012-12-17 | 2015-07-22 | 南京钢铁股份有限公司 | Straightening process of corrosion-resistant steel sheet of cargo oil tank of crude oil carrier |
| CN104209373A (en) * | 2014-08-18 | 2014-12-17 | 南京钢铁股份有限公司 | Multi-pass curvature decreasing straightening technology |
| CN104209373B (en) * | 2014-08-18 | 2016-06-08 | 南京钢铁股份有限公司 | A kind of multi-pass curvature degression type straightening process |
| CN104550327A (en) * | 2014-12-19 | 2015-04-29 | 秦皇岛首秦金属材料有限公司 | Medium-thick plate hot straightening machine roller seam setting method based on plastic deformation rate |
| CN104668313A (en) * | 2015-01-30 | 2015-06-03 | 燕山大学 | Roller gap adjustment method of seven-roller thick plate straightener |
| CN109500298A (en) * | 2018-12-07 | 2019-03-22 | 中冶建筑研究总院有限公司 | A kind of use for laboratory high intensity round straightener and method for aligning |
| CN109500298B (en) * | 2018-12-07 | 2023-05-23 | 中冶建筑研究总院有限公司 | High-strength round steel straightening machine for laboratory and straightening method |
| CN113617843A (en) * | 2021-09-14 | 2021-11-09 | 鞍钢股份有限公司 | Method for eliminating residual stress of hot-rolled strip steel at high temperature |
| CN113941606A (en) * | 2021-09-26 | 2022-01-18 | 中冶南方工程技术有限公司 | Small-time lag control method for cold-rolling full-hydraulic multi-roller straightening roll gap |
| CN113941606B (en) * | 2021-09-26 | 2023-05-26 | 中冶南方工程技术有限公司 | Time lag control method for cold rolling full-hydraulic multi-roller straightening roll gap |
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Application publication date: 20121017 |