CN102049416A - Roller as well as device and method for rolling steel rails - Google Patents
Roller as well as device and method for rolling steel rails Download PDFInfo
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- CN102049416A CN102049416A CN2009102123537A CN200910212353A CN102049416A CN 102049416 A CN102049416 A CN 102049416A CN 2009102123537 A CN2009102123537 A CN 2009102123537A CN 200910212353 A CN200910212353 A CN 200910212353A CN 102049416 A CN102049416 A CN 102049416A
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Abstract
The invention relates to a roller. The roller is a revolution body and at least one part of the two sides of a longitudinal section of the revolution body is a symmetrical protuberant arc. The center point of the protuberant arc coincides with center points of the two sides of the longitudinal section. The invention also provides a device for rolling steel rails. The device comprises a pair of horizontal rollers and a pair of vertical rollers. The pair of horizontal rollers are respectively used as rail webs of the two sides of the formed steel rail and the pair of vertical rollers are respectively used as a railhead and a rail base of the formed steel rail, wherein a vertical roller used for forming the rail base of the steel rail is the roller provided by the invention. The invention also provides a method for rolling the steel rails. The method comprises finish rolling of the steel rails, wherein the device for rolling the steel rails provided by the invention is used to finish roll the steel rails, so that the rail base of the steel rail has inwards-recessed parts recessed, thereby ensuring the shaping effects after straightening and effectively reducing the residual stress of the steel rails.
Description
Technical field
The present invention relates to roll, be used for the equipment and the steel rail rolling method of roll out steel rail.
Background technology
The steel rail rolling process comprises that the rail to heating carries out split rolling method, intermediate rolling and finish rolling successively and aligns after rail cooling.Can detect the residual stress of rail behind the aligning by modes such as nondestructive inspections.Studies show that both at home and abroad the size of rail residual stress and distribution will have a strong impact on the serviceability of rail.The rail residual stress is more little, and is safe in utilization favourable more to rail.Because the rail residual stress forms in the steel rail rolling process, therefore, be to reduce rail to rectify antecurvature curvature and aligning drafts in order to control or reduce the method that the rail residual stress adopts usually in the prior art.Reducing rail, to rectify the purpose of antecurvature curvature be to reduce the aligning drafts during for steel rail straightening precondition is provided, when just glacing flatness requires after satisfying steel rail straightening, reduce the aligning drafts as far as possible, increase excessive influence thereby reduction brings the rail residual stress because of the aligning process.Owing to reduced the aligning drafts, the leveling effect that this can influence rail influences the mouldability of rail.
Summary of the invention
The purpose of this invention is to provide a kind of roll, a kind of equipment and a kind of steel rail rolling method that can guarantee leveling effect and reduce the rail residual stress that is used for roll out steel rail.
Roll of the present invention is a revolving body, and at least a portion of the both sides of the longitudinal section of this revolving body forms the arc of the protrusion of symmetry, and the mid point of the arc of this protrusion is consistent with the mid point of the both sides of described longitudinal section.
The equipment that is used for roll out steel rail of the present invention comprises an a pair of horizontal roller and an opposite roller, described a pair of horizontal roller is respectively applied for the web of the rail of moulding rail both sides, a described opposite roller is respectively applied for the rail head and the flange of rail of moulding rail, wherein, the edger roll that is used for the flange of rail of the described rail of moulding is a roll of the present invention.
Steel rail rolling method of the present invention comprises rail is carried out finish rolling, wherein, uses the equipment that is used for roll out steel rail of the present invention that rail is carried out finish rolling, makes the flange of rail of rail have recessed part inwardly.
The present inventor finds that after deliberation the residual stress of rail mainly concentrates on the flange of rail of rail, and the middle part to the flange of rail when particularly aligning can produce tension, thereby causes the middle part of the flange of rail residual stress concentrations to occur.Steel rail rolling method of the present invention uses the equipment that is used for roll out steel rail of the present invention to carry out finish rolling, is making the described flange of rail have and the corresponding recessed part of roll surface shape later on inwardly through described finish rolling.Because finish rolling makes the described flange of rail form (towards rail head) recessed part inwardly, thereby when the rail with this recessed part is aligned, smoothing roll is the two ends at the bottom of the conductor rail at first, touch the middle part of the flange of rail more gradually, finally make the whole flange of rail all touch smoothing roll.So just reduced smoothing roll and the flange of rail the middle part contact pressure, thereby reduced the tension at the middle part of the aligning back flange of rail, realized the stable control of rail residual stress.
Description of drawings
Fig. 1 is the schematic diagram that shows the vertical sectional shape of roll of the present invention;
Fig. 2 is to use the shape of cross section schematic diagram of the rail after the steel rail rolling method finish rolling of the present invention;
Fig. 3 is the schematic diagram that shows the aligning process.
The specific embodiment
Roll of the present invention is a revolving body, and at least a portion of the both sides of the longitudinal section of this revolving body forms the arc of the protrusion of symmetry, and the mid point of the arc of this protrusion is consistent with the mid point of the both sides of described longitudinal section.
Preferably, the both sides of described longitudinal section form the arc of the protrusion of symmetry on the whole.
The arc of described protrusion can be a circle or an oval part.Preferably, as shown in Figure 1, described arc is circular arc A ⌒ A.Just the roll surface of described roll comprises the part of protruding sphere.More preferably, the action of circular arc A ⌒ A can be 1.1mm-2.2mm, and chord length h can be 200mm-300mm; Selectively, can make the radius of curvature of circular arc A ⌒ A is 20m-45m, thereby makes described roll have the protruding sphere of suitable degree of crook.
The equipment that is used for roll out steel rail of the present invention comprises an a pair of horizontal roller and an opposite roller, described a pair of horizontal roller is respectively applied for the web of the rail of moulding rail both sides, a described opposite roller is respectively applied for the rail head and the flange of rail of moulding rail, wherein, the edger roll that is used for the flange of rail of the described rail of moulding is a roll of the present invention.The edger roll that hereinafter will be used for the flange of rail of the described rail of moulding abbreviates flange of rail edger roll as.
Can obtain the equipment that is used for roll out steel rail of the present invention by existing omnipotent pass finishing mill is improved, promptly use the flange of rail edger roll of roll of the present invention as omnipotent pass finishing mill.Can use the original roller of omnipotent pass finishing mill with the roller that the rail head of rail contacts with waist, thereby form the UF pass with flange of rail edger roll.Before the finish rolling, the position by adjusting a described opposite roller and a pair of horizontal roller is to obtain required UF pass.During finish rolling, a described opposite roller and a pair of horizontal roller are rotated and are contacted to be rolled with rail head, the flange of rail and two webs of the rail of rail respectively around axis separately.Rail forms the shape of cross section consistent with the shape of UF pass (as shown in Figure 2) after finish rolling.
Preferably, as shown in Figure 1, the both sides of the longitudinal section of flange of rail edger roll form circular arc A ⌒ A (hereinafter referred to as the circular arc A ⌒ A of flange of rail edger roll) on the whole.The action of circular arc A ⌒ A represents that with m chord length is the height h of edger roll.
Steel rail rolling method of the present invention comprises: rail is carried out finish rolling, wherein, use the equipment that is used for roll out steel rail of the present invention that rail is carried out finish rolling, make the flange of rail of rail have recessed part inwardly.
Owing to used the equipment that is used for roll out steel rail of the present invention to carry out finish rolling, rail is through after the finish rolling, the cross section of rail as shown in Figure 2, the circular arc B ⌒ B that the flange of rail of rail forms the circular arc B ⌒ B (hereinafter referred to as the circular arc B ⌒ B of the flange of rail) and the flange of rail is at least the part of the circular arc A ⌒ A of flange of rail edger roll.Wherein, the maximum of the difference in height of the flange of rail of rail is the action of the circular arc B ⌒ B of the flange of rail.
In addition, because the width w of the flange of rail of rail is less than the height h (being the chord length of the circular arc A ⌒ A of flange of rail edger roll) of flange of rail edger roll, so the flange of rail is not to contact with the whole surface of the flange of rail edger roll when rolling.Therefore, the flange of rail does not form and the complete corresponding shape of the roll surface of flange of rail edger roll, but with the middle part corresponding shape of roll surface.That is to say, the roll surface of described flange of rail edger roll has part that contacts with the flange of rail and the part that does not contact with the flange of rail, wherein, the part that contacts with the flange of rail of described flange of rail edger roll is defined as complete contact portion, the width of this complete contact portion is consistent with the width of the flange of rail.That is to say that as shown in Figure 1, the circular arc C ⌒ C that described complete contact portion forms is the part of circular arc A ⌒ A of the flange of rail and identical with the circular arc B ⌒ B of the flange of rail after the finish rolling.The width of the flange of rail of rail is approximately equal to the chord length w of the circular arc B ⌒ B of the flange of rail after the finish rolling.Therefore, the chord length of circular arc B ⌒ B and circular arc C ⌒ C can represent that all action is all used m with w
0Expression.
In addition, by Fig. 1 and mathematics general knowledge as can be known, the size of the action m of the circular arc A ⌒ A of flange of rail edger roll depends on the degree of crook of chord length (being the height h of flange of rail edger roll) and roll surface.Therefore, can (be action m according to the width w of the flange of rail and required deflection
0) select highly and the suitable flange of rail edger roll of roll surface degree of crook.Because the flange of rail width of rail is generally 110mm-155mm, preferably, in order the flange of rail to be applied suitable distortion to realize purpose of the present invention better, can make the action m of the circular arc A ⌒ A of flange of rail edger roll is 1.1mm-2.2mm, chord length h is 200mm-300mm, thereby makes the action m of the circular arc B ⌒ B of the flange of rail after the finish rolling
0Be 0.2mm-0.6mm, chord length w is 110mm-155mm.
Steel rail rolling method of the present invention also comprise rail carried out finish rolling after, with the rail cooling, align then, make the recessed degree of recessed part of the flange of rail of rail reduce inwardly.
Usually, aligning adopts roll straightening, promptly by carrying out with a plurality of smoothing rolls that the rail head of rail contacts with the flange of rail, for example, can align by two rows roller group shown in Figure 3, wherein, 1# roller, 3# roller, 5# roller, 7# roller and 9# roller contact with the flange of rail of rail and fixed-site vertically, 2# roller, 4# roller, 6# roller and 8# roller contact with the rail head of rail and vertically adjusting position to adjust drafts.
Preferably, the overall reduction of aligning is 29.5-40mm, and aligning makes that the maximum of difference in height of the described flange of rail is 0-0.3mm, just makes the action m of arc (not shown) of the flange of rail of the cross section of aligning back rail
1Be 0-0.3mm.
In addition, steel rail rolling method of the present invention also comprise rail carried out finish rolling before, with described rail heating and successively described rail is carried out split rolling method and intermediate rolling.Wherein, split rolling method can use the split rolling method frame to be rolled, and the intermediate rolling of rail can be adopted omnipotent pass intermediate rolling, just uses omnipotent reversible pass milling train to be rolled.Described omnipotent reversible pass milling train carries out intermediate rolling by the UR pass (omnipotent breakdown pass) that is formed by an a pair of horizontal roller and an opposite roller.
Split rolling method, omnipotent pass intermediate rolling and omnipotent pass finish rolling are milling methods well known in the art, the operation and the using method of split rolling method frame, omnipotent reversible pass milling train and omnipotent pass finishing mill also are well known in the art, do not elaborate at this.
Can set the rolling pass of corresponding split rolling method and intermediate rolling according to the rail of different size, finish rolling and aligning are generally a time.Specify steel rail rolling method of the present invention below.
At first, rail is heated to required temperature, the heating-up temperature of described rail is 1210 ℃-1250 ℃; The rolling temperature of described split rolling method is 1150 ℃-1180 ℃, and sectional shrinkage is 78.5%-81.2%, rolling 10 passages; The rolling temperature of described intermediate rolling is 1020 ℃-1060 ℃, and the sectional shrinkage of described intermediate rolling is 61.4%-64.7%, rolling 4 passages; The rolling temperature of described finish rolling is 890 ℃-950 ℃, and the cross section shrinkage is 4.7%-7.5%, and finish rolling makes that the flange of rail is recessed inwardly and forms shape shown in Figure 2; The drafts of described aligning is 29.5-40mm.Made the rail cooling after the finish rolling 1.5-3 hour, and aligned then.The laying state of rail is that the flange of rail is down up for rail head during aligning.During aligning, the overall reduction of aligning is 29.5-40mm, for example can make the drafts of 2# roller, 4# roller, 6# roller and 8# roller be respectively 14.0-17.0mm, 11.0-14.0mm, 4.0-7.0mm, 0.5-2.0mm, thereby obtain the rail of all size.
The advantage of steel rail rolling method of the present invention is described below by embodiment.
Embodiment 1
Omnipotent pass finishing mill is improved obtaining the equipment that is used for roll out steel rail of the present invention, and this is improved to roll of the present invention and is used for the flange of rail edger roll of roll out steel rail bottom width degree less than the finishing mill of the universal mill unit of all kinds rail below the 250mm as what Germany western mark company made.
Use the roll out steel rail of U75V material; At first with rail blank heating to 1210 ℃ to carry out split rolling method, the sectional shrinkage of split rolling method is 78.5%; Use omnipotent reversible pass milling train to carry out intermediate rolling at 1060 ℃, the sectional shrinkage of intermediate rolling is 61.7%; Use above-mentioned improved omnipotent pass finishing mill to carry out finish rolling at 950 ℃, the sectional shrinkage of finish rolling is 4.7%; The rail cooling is after 3 hours, and rail temperature is lower than 60 ℃, uses roll leveller to align, the aligning drafts is 40mm, wherein, the drafts of 2# roller, 4# roller, 6# roller and 8# roller is respectively 17mm, 14mm, 7mm, 2mm, finally obtains the rail that specification is 75kg/m; The aligning back adopts the method for pasting the strain of resistance-strain built-in testing to record the residual stress of rail, and the result is as shown in table 1.Wherein, the height h of the flange of rail edger roll of finishing mill is 280mm, and the action m of the circular arc A ⌒ A of flange of rail edger roll is 2.09mm, and the action m of the circular arc C ⌒ C of complete contact portion formation
0Be 0.6mm.
Embodiment 2
According to the mode roll out steel rail of embodiment 1, difference is: ℃ to carry out split rolling method, the sectional shrinkage of split rolling method is 79.3% with rail blank heating to 1220; Use omnipotent reversible pass milling train to carry out intermediate rolling at 1060 ℃, the sectional shrinkage of intermediate rolling is 62.5%; Use improved omnipotent pass finishing mill to carry out finish rolling at 940 ℃, the sectional shrinkage of finish rolling is 5.1%; The rail cooling used roll leveller to align after 2.5 hours, and the aligning drafts is 37.5mm, and wherein, the drafts of 2# roller, 4# roller, 6# roller and 8# roller is respectively 16mm, 14mm, 6mm, 1.5mm, to obtain the rail that specification is 68kg/m.Wherein, the action m of the circular arc A ⌒ A of the flange of rail edger roll of finishing mill is 1.69mm, and the action m of the circular arc C ⌒ C of complete contact portion formation
0Be 0.5mm.
Embodiment 3
According to the mode roll out steel rail of embodiment 1, difference is: ℃ to carry out split rolling method, the sectional shrinkage of split rolling method is 80.6% with rail blank heating to 1230; Use omnipotent reversible pass milling train to carry out intermediate rolling at 1050 ℃, the sectional shrinkage of intermediate rolling is 62.4%; Use improved omnipotent pass finishing mill to carry out finish rolling at 920 ℃, the sectional shrinkage of finish rolling is 5.5%; The rail cooling used roll leveller to align after 2.5 hours, and the aligning drafts is 35mm, and wherein, the drafts of 2# roller, 4# roller, 6# roller and 8# roller is respectively 15mm, 13mm, 6mm, 1mm, to obtain the rail that specification is 60kg/m.Wherein, the action m of the circular arc A ⌒ A of the flange of rail edger roll of finishing mill is 1.39mm, and the action m of the circular arc C ⌒ C of complete contact portion formation
0Be 0.4mm.
Embodiment 4
According to the mode roll out steel rail of embodiment 1, difference is: ℃ to carry out split rolling method, the sectional shrinkage of split rolling method is 80.8% with rail blank heating to 1240; Use omnipotent reversible pass milling train to carry out intermediate rolling at 1040 ℃, the sectional shrinkage of intermediate rolling is 63.9%; Use improved omnipotent pass finishing mill to carry out finish rolling at 910 ℃, the sectional shrinkage of finish rolling is 6.7%; The rail cooling used roll leveller to align after 2 hours, and the aligning drafts is 33mm, and wherein, the drafts of 2# roller, 4# roller, 6# roller and 8# roller is respectively 15mm, 12mm, 5mm, 1mm, to obtain the rail that specification is 50kg/m.Wherein, the action m of the circular arc A ⌒ A of the flange of rail edger roll of finishing mill is 1.35mm, and the action m of the circular arc C ⌒ C of complete contact portion formation
0Be 0.3mm.
Embodiment 5
According to the mode roll out steel rail of embodiment 1, difference is: ℃ to carry out split rolling method, the sectional shrinkage of split rolling method is 81.2% with rail blank heating to 1250; Use omnipotent reversible pass milling train to carry out intermediate rolling at 1020 ℃, the sectional shrinkage of intermediate rolling is 64.7%; Use improved omnipotent pass finishing mill to carry out finish rolling at 890 ℃, the sectional shrinkage of finish rolling is 7.5%; The rail cooling used roll leveller to align after 1.5 hours, and the aligning drafts is 29.5mm, and wherein, the drafts of 2# roller, 4# roller, 6# roller and 8# roller is respectively 14mm, 11mm, 4mm, 0.5mm, to obtain the rail that specification is 43kg/m.Wherein, the action m of the circular arc A ⌒ A of the edger roll of finishing mill is 1.21mm, and the action m of the circular arc C ⌒ C of complete contact portion formation
0Be 0.2mm.
Comparative Examples 1
According to the mode roll out steel rail of embodiment 1, difference is: flange of rail edger roll arc, that roll surface is straight that uses the both sides, longitudinal section of roll surface not have projection during finish rolling carries out finish rolling.
The action m of the arc B ⌒ B that the flange of rail forms after the action m of the circular arc A ⌒ A of the height h of the flange of rail edger roll of the finishing mill in embodiment 1-5 and the Comparative Examples 1, flange of rail edger roll, the finish rolling
0The action m of the width w of (action of the circular arc C ⌒ C of contact portion formation fully), the flange of rail, the arc of aligning back recess
1The residual stress at the middle part of the flange of rail that records before and after (maximum of the difference in height of aligning back flange of rail recess) and the aligning is as shown in table 1.Wherein, sequence number 1-5 is embodiment 1-5, and sequence number 6 is a Comparative Examples 1.
Table 1
According to standard GB 2585-2008, the residual stress at the middle part of the flange of rail should be not more than 250MPa, and the maximum of the difference in height of the recess of the flange of rail should be not more than 0.3mm.By table 1 as seen, the rail that obtains by steel rail rolling method of the present invention satisfies above-mentioned requirements.
Claims (14)
1. a roll is characterized in that, described roll is a revolving body, and at least a portion of the both sides of the longitudinal section of this revolving body is the arc of the protrusion of symmetry, and the mid point of the arc of this protrusion is consistent with the mid point of the both sides of described longitudinal section.
2. roll according to claim 1, wherein, the both sides of described longitudinal section are the arc of the protrusion of symmetry on the whole.
3. roll according to claim 1, wherein, the arc of described protrusion is a circular arc.
4. roll according to claim 3, wherein, the action of described circular arc is 1.1mm-2.2mm, chord length is 200mm-300mm.
5. roll according to claim 3, wherein, the radius of curvature of described circular arc is 20m-45m.
6. equipment that is used for roll out steel rail, this equipment comprises an a pair of horizontal roller and an opposite roller, described a pair of horizontal roller is respectively applied for the web of the rail of moulding rail both sides, a described opposite roller is respectively applied for the rail head and the flange of rail of moulding rail, it is characterized in that the edger roll that is used for the flange of rail of the described rail of moulding is any described roll of claim 1-5.
7. steel rail rolling method, this method comprises carries out finish rolling to rail, wherein, uses the described equipment that is used for roll out steel rail of claim 5 that rail is carried out finish rolling, makes the flange of rail of rail have recessed part inwardly.
8. method according to claim 7, wherein, the rolling temperature of described finish rolling is 890 ℃-950 ℃, sectional shrinkage is 4.7%-7.5%;
9. according to claim 7 or 8 described methods, wherein, after the finish rolling, the cross section of the recessed inwardly part of the flange of rail of described rail is a circular arc, and the action of described circular arc is 0.2mm-0.6mm, and chord length is 110mm-155mm.
10. according to claim 7 or 8 described methods, wherein, this method also comprise rail carried out finish rolling after, with the rail cooling, align then, make the recessed degree of recessed part of the flange of rail of rail reduce inwardly.
11. method according to claim 10, wherein, the drafts of described aligning is 29.5-40mm, and described aligning makes that the maximum of difference in height of the flange of rail of described rail is 0-0.3mm.
12. according to claim 7 or 8 described methods, wherein, this method also comprise rail carried out finish rolling before, with described rail heating and successively described rail is carried out split rolling method and intermediate rolling.
13. steel rail rolling method according to claim 12, wherein, described intermediate rolling is omnipotent reversible groove rolling.
14. steel rail rolling method according to claim 12, wherein, the heating-up temperature of described rail is 1210 ℃-1250 ℃; The rolling temperature of described split rolling method is 1150 ℃-1180 ℃, and sectional shrinkage is 78.5%-81.2%; The temperature of described intermediate rolling is 1020 ℃-1060 ℃, and the sectional shrinkage of described intermediate rolling is 61.4%-64.7%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102123537A CN102049416B (en) | 2009-11-06 | 2009-11-06 | Roller as well as device and method for rolling steel rails |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102123537A CN102049416B (en) | 2009-11-06 | 2009-11-06 | Roller as well as device and method for rolling steel rails |
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| Publication Number | Publication Date |
|---|---|
| CN102049416A true CN102049416A (en) | 2011-05-11 |
| CN102049416B CN102049416B (en) | 2012-11-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104941998A (en) * | 2015-05-07 | 2015-09-30 | 内蒙古包钢钢联股份有限公司 | Vertical steel rail rolling method |
| CN108430659A (en) * | 2016-01-07 | 2018-08-21 | 新日铁住金株式会社 | The manufacturing method and rolling device of H profile steel |
| PL441428A1 (en) * | 2022-06-09 | 2023-12-11 | Arcelormittal Poland Spółka Akcyjna | Rolling mill roll passes for rolling railway and tramway rails |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0911415B1 (en) * | 1990-09-17 | 2005-12-07 | DSM IP Assets B.V. | Microbiological manufacture of L-ascorbic acid |
| CN1299843C (en) * | 2003-08-27 | 2007-02-14 | 鞍钢新轧钢股份有限公司 | Short flow path manufacturing method of heavy rail |
| CN1799718A (en) * | 2005-01-05 | 2006-07-12 | 东北大学 | Complete universal finish groove heavy rail rolling method with railhead wheel tread curve shallow slot vertical roller |
| CN201033331Y (en) * | 2007-05-23 | 2008-03-12 | 北京中钢贸科技发展有限公司 | Working roller type for the twenty-roller |
-
2009
- 2009-11-06 CN CN2009102123537A patent/CN102049416B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104941998A (en) * | 2015-05-07 | 2015-09-30 | 内蒙古包钢钢联股份有限公司 | Vertical steel rail rolling method |
| CN108430659A (en) * | 2016-01-07 | 2018-08-21 | 新日铁住金株式会社 | The manufacturing method and rolling device of H profile steel |
| CN108430659B (en) * | 2016-01-07 | 2020-01-10 | 日本制铁株式会社 | Method for producing H-shaped steel and rolling device |
| PL441428A1 (en) * | 2022-06-09 | 2023-12-11 | Arcelormittal Poland Spółka Akcyjna | Rolling mill roll passes for rolling railway and tramway rails |
| EP4289522A1 (en) * | 2022-06-09 | 2023-12-13 | Arcelormittal Poland S.A. | Rolling mill roll for rolling railway and tram rails |
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| CN102049416B (en) | 2012-11-21 |
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