CN101927280B - Method for straightening flatness at end part of steel rail - Google Patents
Method for straightening flatness at end part of steel rail Download PDFInfo
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- CN101927280B CN101927280B CN 201010269010 CN201010269010A CN101927280B CN 101927280 B CN101927280 B CN 101927280B CN 201010269010 CN201010269010 CN 201010269010 CN 201010269010 A CN201010269010 A CN 201010269010A CN 101927280 B CN101927280 B CN 101927280B
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Abstract
The invention discloses a straightening method, and in particular to a method for strengthening the flatness at the end part of a steel rail, belonging to the technical field of producing and processing the steel rails and providing a method for strengthening the flatness at the end part of the steel rail, which ensures that the strengthened steel rail does not generate a great quantity of resilience. The method comprises the following steps of: a, measuring the maximum bending value of a steel rail rolled by a rolling mill and the accurate position of the maximum bending value in the length direction of the steel rail; b, determining the straightening pressing compensation value and the strengthening compensation length of a strengthening roll on a strengthening machine according to the measured bending value and the measured bending position of the steel rail; c, inputting the straightening pressing compensation value and the strengthening compensation length into a strengthening machine control system; and d, sending the steel rail into the strengthening machine for strengthening.
Description
Technical field
The present invention relates to a kind of method for aligning, especially relate to a kind of method for aligning of flatness at end part of steel rail, belong to the rail manufacture field.
Background technology
After the finished product rail mails to the user, the phenomenon that rail front end flexibility exceeds standard occurs, and dispatch from the factory when reviewing, its front end flexibility all belongs to qualified products in critical field.Through analyzing, the reason that above-mentioned situation occurs mainly is, different rolled piece temperature are different, cause the fluctuation of omnipotent finishing mill tapping glacing flatness, and front end does not have constraint and produces crooked; Roller-way side plate about crooked rail front end bump or following cover plate and to form complicated termination wave curved or big curved.And in the aligning process of postorder; The different parts of all rail and every one steel rail all adopts identical smoothing roll drafts; Promptly adopt identical aligning to depress power F and align, thereby after aligning was accomplished, rail was transported to the process of inspection stand from the straightener outlet; The rail front end is out of shape bigger position in horizontal glacing flatness direction generation elastic recovery, just causes flexibility overproof; Reply reason and be rail in the aligning process, be out of shape the straightening force rail that causes less than normal that uses at bigger position and at this position sufficient plastic deformation does not take place, straightening force F unloading is rail generation elastic recovery afterwards.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of making by the rail behind the aligning not produce the method for straightening flatness at end part of steel rail of a large amount of resiliences.
The technical scheme that adopts for solving the problems of the technologies described above is: method for straightening flatness at end part of steel rail, may further comprise the steps,
The maximum deflection value and the definite position of this maximum deflection value on said rail length direction of the rail that a, measurement milling train shut out;
B, confirm that according to the said maximum deflection value of measured rail and said accurate location the aligning of straightener upper straightening roll depresses offset and aligning compensating length;
C, said aligning is depressed offset and aligning compensating length input The straightener control system;
D, said rail sent on the straightener align.
Further be, for the residual-stress value that makes the rail behind the aligning less than 250Mpa, the high deviation changing value of rail less than the live load of 0.3 ㎜ and equipment motor less than rated load, said aligning is depressed offset and is equaled 3 ㎜.
Further be when confirming the aligning compensating length, to make said aligning compensating length equal the length of end of rail to said definite position.
Further be when definite position on said rail length direction of the maximum deflection value of measuring rail and this maximum deflection value, to measure the high maximum deflection difference value of rail rail simultaneously and along the definite position of rail length direction; When the maximum deflection value of said rail when the high maximum deflection difference value of the definite position on said rail (1) length direction and rail is inconsistent in the definite position on the rail length direction, with that bigger in the maximum deflection value of rail and the high maximum deflection difference value of rail value place along the definite position on the rail length direction as the aligning compensating length.
The invention has the beneficial effects as follows: the offset when confirming the straightener upper straightening roll than normal aligning under the needs multiple pressure according to the size of end of rail bending value; According to the said crooked position of rail aligning length of offset under the needs multiple pressure when the length of end of rail is confirmed the needs upper straightening roll than normal aligning; Thereby realize the flexibility different at different position and different being taked the different technology of depressing according to the crooked situation of each section on the elongated direction of rail; Make the big position of flexibility that plastic deformation can take place under bigger contraflexure straightening force effect; Avoid the rail after aligning is accomplished after shedding aligning external force, elastic recovery to occur, reached comparatively ideal leveling effect.
Description of drawings
Fig. 1 is the straightener roll of straightener of method for straightening flatness at end part of steel rail of the present invention and the structural representation of rail interactively.
Be labeled as among the figure: rail 1, upper straightening roll 21, following smoothing roll 22, position sensor 3.
The specific embodiment
Existing rail straghtener as shown in Figure 1 comprises upper straightening roll 21, plays smoothing roll 22 and controls the control system that said upper straightening roll 21 moves up and down, plays smoothing roll 22 forward and reverse rotations.During work; The rail 1 of needs aligning is sent in the gap between upper straightening roll 21 and the following smoothing roll 22; Rotation through following smoothing roll is moved said rail 1 between upper straightening roll 21 and following smoothing roll 22, through moving up and down of upper straightening roll 21, apply a downward aligning active force to rail 1; Following smoothing roll 22 produces a reaction force that makes progress, thereby realizes the flexural deformation of rail 1 is aligned.When by the gross or whole one steel rail 1 distortion is less or the unified size of promptly being out of shape of deformation ratio when being more or less the same; In the aligning process, make the drafts of upper straightening roll 21 keep a fixed value can reach the aligning purpose; When but Where topical flexural deformation is bigger than the flexural deformation at other position, still make upper straightening roll 21 drafts keep a fixed value, promptly also be to use the identical straightening force F that presses down; Then can't make rail 1 produce enough plastic deformations at the bigger position of flexural deformation; And mainly produce strain, after aligning external force F shed, described flexural deformation just can be returned to the purpose that original position does not have aligning.
In order to reach above-mentioned aligning purpose, the invention provides a kind of making and do not produce the method for straightening flatness at end part of steel rail of a large amount of resiliences by the rail behind the aligning.Said method for aligning may further comprise the steps,
The maximum deflection value and the definite position of this maximum deflection value on said rail 1 length direction of the rail 1 that a, measurement milling train shut out;
B, confirm that according to the bending value of measured rail 1 and bending position straightener upper straightening roll 21 alignings depress offset and aligning compensating length;
C, said aligning is depressed offset and aligning compensating length input The straightener control system;
D, said rail 1 sent on the straightener align.
When rail 1 local deformation is more much bigger than the distortion at other position; For producing plastic deformation, the bigger position of distortion that makes rail 1 just must apply a straightening force F ' who is enough to make its generation plastic deformation at this position; Increase the distance that moves down in the time of so just must making upper straightening roll 21 than the common bending of rectification; Be that straightener upper straightening roll 21 alignings described in the above-mentioned method for aligning are depressed offset; Because the appearance that this aligning is depressed offset, applying one through upper straightening roll 21 to rail 1 is enough to make the bigger position of distortion of rail 1 that plastic deformation takes place, thereby reaches the purpose of aligning.Actual conditions according to the production scene; Being out of shape bigger position generally all concentrates in the certain scope of rail 1 front end; So needing increases the length of depressing offset, promptly aligning compensating length only needs more than or equal to getting final product from the length between rail 1 end to the said moderate finite deformation.The construction method that analysis and the present invention adopted through above-mentioned is known; Be according to the different method for aligning that adopt upper straightening roll 1 segmentation to depress of the distortion of rail 1 different parts on method for aligning of the present invention is realized in the aligning process; Be that the big position upper straightening roll 1 of flexural deformation is depressed distance greatly; It is little that the little position upper straightening roll 1 of flexural deformation is depressed distance; Thereby make the big position of flexibility can plastic deformation take place under bigger contraflexure straightening force effect, avoided the rail after aligning is accomplished after shedding aligning external force, elastic recovery to occur, reached comparatively ideal leveling effect.
We know that when steel were sent out plastic deformation, its inner residual stress also can increase, and use bigger straightening force F ' to make rail generation plastic deformation simultaneously and by behind the aligning, its rail height also can respective change.For the residual-stress value that makes the rail after the rectification satisfy standard code less than 250Mpa require, make the high deviation changing value of rail less than the live load of 0.2-0.3 ㎜ and equipment motor less than rated load, described aligning is depressed offset and is equaled 3 ㎜.
In the above-mentioned embodiment, aligning is depressed offset can manually control by operating personnel with the control of aligning compensating length, but the labour intensity of this control mode, and control inaccurate.According to having the characteristics that equipment for straightening self has the control system now, the offset of depressing according to the invention is controlled according to the offset that presses down of input by the basic automatization control program of straightener self; Said aligning compensating length is by the position sensor that is arranged on the straightener porch 3 controls, and this can realize automation control very easily, also can reduce labor intensity of operating personnel simultaneously, guarantees straightening quality.
Find also that in the On line inspection process rail 1 exists the bigger local buckling in the scope of end 5-8m, also have rail height ratio calibrated altitude height and other position situation lower than calibrated altitude, the one high and one low so high deviation of rail that just causes is bigger; And know that from above-mentioned analysis the rail height of rail 1 also can change when the aligning flexibility.In order also can effectively to imitate the high deviation of the right path, when the maximum deflection value of measuring rail 1 and bending position, measure the high maximum deflection difference value of rail 1 rail simultaneously and along the definite position of rail 1 length direction in the 1 diastrophic while of straightening of kinked rail; When confirming the aligning compensating length, the position that the maximum deviation that the rail that consideration simultaneously records is high exists; Reduced the high deviate of rail rail in the straightening of kinked rail end in crooked, and when the max bend position of said rail 1 and the high maximum deviation of rail position are inconsistent, with the extension position of maximum distortion as aligning compensating length.Adopt after the described construction method the high deviation of rail that has also reduced rail 1 in the diastrophic while of straightening of kinked rail 1.
Claims (4)
1. method for straightening flatness at end part of steel rail may further comprise the steps,
The maximum deflection value and the definite position of this maximum deflection value on said rail (1) length direction of the rail (1) that a, measurement milling train shut out;
B, confirm that according to the said maximum deflection value of measured rail (1) and said accurate location the aligning of straightener upper straightening roll (21) depresses offset and aligning compensating length;
C, said aligning is depressed offset and aligning compensating length input The straightener control system;
D, said rail sent on the straightener align.
2. method for straightening flatness at end part of steel rail according to claim 1; It is characterized in that: for the residual-stress value that makes the rail (1) behind the aligning less than 250Mpa, the high deviation changing value of rail less than the live load of 0.3 ㎜ and equipment motor less than rated load, described aligning is depressed offset and is equaled 3 ㎜.
3. method for straightening flatness at end part of steel rail according to claim 1 is characterized in that: when confirming the aligning compensating length, make said aligning compensating length equal the length of rail (1) end to said definite position.
4. according to the described method for straightening flatness at end part of steel rail in arbitrary top in the claim 1～3; It is characterized in that: when definite position on said rail (1) length direction of the maximum deflection value of measuring rail (1) and this maximum deflection value, measure the high maximum deflection difference value of rail (1) rail simultaneously and along the definite position of rail length direction; When the maximum deflection value of said rail (1) when the high maximum deflection difference value of the definite position on said rail (1) length direction and rail is inconsistent in the definite position on the rail length direction, with that bigger in the maximum deflection value of rail and the high maximum deflection difference value of rail value place along the definite position on the rail length direction as the aligning compensating length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010269010 CN101927280B (en) | 2010-09-01 | 2010-09-01 | Method for straightening flatness at end part of steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010269010 CN101927280B (en) | 2010-09-01 | 2010-09-01 | Method for straightening flatness at end part of steel rail |
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| Publication Number | Publication Date |
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| CN101927280A CN101927280A (en) | 2010-12-29 |
| CN101927280B true CN101927280B (en) | 2012-10-17 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103056198B (en) * | 2012-09-26 | 2015-03-04 | 攀钢集团攀枝花钢钒有限公司 | Speed regulating method and system of straightening roller of vertical roller type straightener |
| CN103056199B (en) * | 2012-09-26 | 2015-06-03 | 攀钢集团攀枝花钢钒有限公司 | Method and system for adjusting and controlling speed of strengthening roll of horizontal roll type straightening machine |
| CN103157702B (en) * | 2013-03-23 | 2016-09-07 | 鞍钢股份有限公司 | Straightening control method for bending end of heavy rail |
| WO2018167034A1 (en) * | 2017-03-13 | 2018-09-20 | Sms Group Gmbh | Roller straightening machine and method for operating same |
| CN108089466B (en) * | 2017-12-15 | 2019-07-09 | 山信软件股份有限公司 | A kind of steel plates straightening control method |
| CN113319152B (en) * | 2021-04-21 | 2022-10-28 | 邯郸钢铁集团有限责任公司 | Method for realizing intelligent pressure straightening of steel rail |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1850385A (en) * | 2006-05-18 | 2006-10-25 | 上海理工大学附属二厂 | Steel rail pre-welding straightening-rust-cleaning integrating machine and its applying method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3754191B2 (en) * | 1997-09-03 | 2006-03-08 | 新日本製鐵株式会社 | Rail straightening method and apparatus |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1850385A (en) * | 2006-05-18 | 2006-10-25 | 上海理工大学附属二厂 | Steel rail pre-welding straightening-rust-cleaning integrating machine and its applying method |
Non-Patent Citations (3)
| Title |
|---|
| JP特开平11-77160A 1999.03.23 |
| 盛艳明等.钢轨端部压力矫直的有限元分析.《重型机械》.2007,(第5期),53-55. * |
| 郭华等.钢轨复合矫直技术的应用.《轧钢》.2002,第19卷(第5期),11-13. * |
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