CN102059528A - Method for manufacturing steel rail - Google Patents
Method for manufacturing steel rail Download PDFInfo
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- CN102059528A CN102059528A CN2009102240117A CN200910224011A CN102059528A CN 102059528 A CN102059528 A CN 102059528A CN 2009102240117 A CN2009102240117 A CN 2009102240117A CN 200910224011 A CN200910224011 A CN 200910224011A CN 102059528 A CN102059528 A CN 102059528A
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Abstract
The invention relates to a method for manufacturing a steel rail, comprising the following steps: rolling high-temperature billet steel into a steel rail blank; cooling the steel rail blank; and manufacturing the cooled steel rail blank into the steel rail. The method also comprises: pre-springing before cooling the steel rail blank. The pre-springing step comprises the step of carrying out pre-springing on the steel rail blank along the direction opposite to the direction in which the steel rail blank is naturally cooled and deformed, wherein the degree of crook of the prespringing curve of the steel rail blank gradually decreases from the two ends of the steel rail blank to the middle part of the steel rail blank. According to the method for manufacturing the steel rail provided by the invention, the prespringing is carried out on the steel rail blank before the steel rail blank is cooled; and in the process of prespringing, the degree of crook of the prespringing curve of the steel rail blank is not uniform along the full length of the steel rail blank, i.e., the degree of crook of the prespringing curve of the steel rail blank gradually decreases from the two ends of the steel rail blank to the middle part of the steel rail blank, therefore, the pre-correction degree of crook of the steel rail blank can be more effectively lowered, and better flatness can be obtained.
Description
Technical field
The present invention relates to the rail field, more particularly, relate to a kind of manufacture method of rail.
Background technology
The manufacture process of rail generally includes following steps: the steel billet of rolling and high-temperature, to obtain the rail blank; Cooling rail blank; Align cooled rail blank; And detect the rail blank, finally be cut into qualified rail etc.
The cross sectional shape of the rail blank of rolling acquisition is basic identical with the cross sectional shape of final rail, as shown in Figure 1.In cooling procedure, the cooling velocity of rail blank cross section each several part is inconsistent.Specifically, the cooling velocity of the flange of rail 3 parts is very fast relatively, and the cooling velocity of rail head 1 part is relatively slow, thereby when the flange of rail 3 parts were cooled to no longer produce contraction distortion, the temperature of rail head 1 part was still higher, in cooling procedure subsequently, continue to produce contraction distortion, therefore, when the rail blank was finally finished cooling, whole rail blank will be to rail head 1 part bending on the cross section.The flexibility of rail blank on the cross section is commonly referred to rectifys antecurvature curvature.Simultaneously, because the cooling velocity of the two end portions of rail blank is very fast relatively, and the cooling velocity of rail blank mid portion is relatively slow, therefore, when the rail blank is finally finished when cooling, the two ends of rail blank can be to the rail head 1 direction warpage of rail blank, thereby presents crooked state in the longitudinal direction, influence the glacing flatness of rail blank, as shown in Figure 2.
The degree of rectifying the straight degree of antecurvature curvature peace is very big to the influence of subsequent handling.If the strong front curve of rail blank is spent (glacing flatness is less) greatly, during the charging roller width, the rail blank can't be transplanted on the roller-way from cold bed, can't carry out straightening processing, thereby cause production to carry out before the rail blank surpasses straightener.
And, promptly allow to enter straightener and carry out straightening processing, but must suitably increase the aligning drafts this moment, so that the rail blank obtains aligning.Can cause like this that residual stress correspondingly increases in the rail of final products, thereby influence the safe in utilization of rail.
Hence one can see that, and in the manufacture process of rail, how reducing the strong antecurvature curvature of rail blank and improving glacing flatness is outbalance.Therefore, in present prior art, generally the rail blank is implemented pre-bending and handle,, make the rail blank before aligning, have good glacing flatness with the strong antecurvature curvature of control rail blank.But in traditional pre-bending was handled, the reverse strain curve of rail blank was essentially circular arc, that is to say, the pre-bending degree of rail blank on its length is essentially uniform.
Yet, the defective that this traditional pre-bending is handled is: because in cooling procedure, the degree of crook of the different piece of rail blank on its length be different (for example, the warpage degree of two end portions is bigger, and the degree of crook of mid portion is less), thereby this traditional pre-bending that even degree of crook is set on length is handled, can not obtain desirable pre-bending effect, the strong antecurvature curvature of rail blank can not be reduced to lower level to obtain glacing flatness preferably.
Summary of the invention
The pre-bending processing that the objective of the invention is to overcome in traditional rail manufacturing method can not reduce strong antecurvature curvature effectively to obtain the defective of glacing flatness preferably, can more effectively reduce the strong antecurvature curvature of rail blank and obtain the rail manufacturing method of glacing flatness preferably and provide a kind of.
According to an aspect of the present invention, provide a kind of manufacture method of rail, this method comprises: high temperature billet steel is rolling for the rail blank; Cooling rail blank; And cooled rail blank made rail, described method also is included in the pre-bending step before the cooling rail blank, this pre-bending step comprises that cooling off deformation side naturally along the rail blank carries out prebuckling to this rail blank in the opposite direction, wherein, the degree of crook of the pre-bending curve of described rail blank partly reduces from both ends to the middle gradually.
The present inventor finds, for the steel (for example length is between 8-15 rice) of limited length, in cooling procedure, the degree of crook of steel total length is more or less the same, thereby it is comparatively suitable that the pre-bending degree on length is essentially uniform traditional pre-bending curve.Yet, for the relatively long steel of length, as length at the rail more than 50 meters (blank), because the length of rail is longer, the distortion of various piece differs greatly on the rail length in cooling procedure, thereby the basic pre-bending curve uniformly of pre-bending degree can not be suitable on traditional length.The present inventor recognizes this variation just, can propose the pre-bending curve that is suitable at the long rail of length of the present invention.
Manufacture method according to rail provided by the present invention, also the rail blank being carried out pre-bending before cooling rail blank handles, and in pre-bending is handled, the degree of crook of the pre-bending curve of rail blank is heterogeneous on whole length, and promptly the degree of crook of the pre-bending curve of rail blank partly reduces from both ends to the middle gradually.Thereby, can more effectively reduce the strong antecurvature curvature of rail blank and obtain glacing flatness preferably.
Description of drawings
Fig. 1 is the sectional view of rail;
Fig. 2 cools off diastrophic schematic diagram for the rail blank;
Fig. 3 is the schematic diagram of a kind of preferred implementation of pre-bending curve provided by the present invention;
Fig. 4 is for implementing the schematic diagram of pre-bending step of the present invention; And
Fig. 5 is the schematic diagram of the laying state of expression rail blank on the pre-bending dolly.
The specific embodiment
Below with reference to accompanying drawing the specific embodiment of the present invention is described in detail.
The invention provides a kind of manufacture method of rail, this method comprises: high temperature billet steel is rolling for the rail blank; Cooling rail blank; And cooled rail blank made rail, described method also is included in the pre-bending step before the cooling rail blank, this pre-bending step comprises that cooling off deformation side naturally along the rail blank carries out prebuckling to this rail blank in the opposite direction, wherein, the degree of crook of the pre-bending curve of described rail blank partly reduces from both ends to the middle gradually.
With respect to traditional rail manufacturing method, the present invention mainly improves the line style of the pre-bending curve in the rail blank pre-bending treatment step, the degree of crook of pre-bending curve is partly reduced from both ends to the middle gradually, thereby be adapted to the characteristics that rail blank different piece on length has different cooling strain degree, can reduce the strong antecurvature curvature of rail blank and obtain glacing flatness preferably, and then help subsequently cooling processing and the processing of operations such as aligning, cutting, produce the higher rail product of quality.
Because method of the present invention is applicable to the manufacturing of rail, and the intermediate products in the manufacturing rail process: the length of rail blank is longer relatively, usually more than 50 meters, thereby in the cooling procedure of reality, the cooling strain degree of the mid portion of rail blank is smaller, has cooling strain hardly.Simultaneously, the deformation extent of the end of rail blank in cooling procedure is but higher relatively.And along on the length of rail blank, the cooling degree from the end of rail blank to mid portion reduces gradually.
Therefore, for this characteristics of rail in cooling procedure that are applicable to that length is long, preferably, described pre-bending curve comprises straightway 10 that is positioned at mid portion and two curved sections 11 that are connected to these straightway 10 two ends, as shown in Figure 3.
The straightway 10 that is positioned at rail blank mid portion is straight line segment, promptly the rail blank is not carried out pre-bending in the zone of this straightway 10, and this and rail blank mid portion in cooling procedure does not almost have the characteristics of cooling strain to adapt.
And in two end portions, the pre-bending curve comprises two curved sections 11 respectively, and near more apart from the end of rail blank in this curved section 11, then Wan Qu degree is also big more.This and rail blank adapt in the bigger characteristics of the cooling strain of cooling procedure medial end portions.
Preferably, described two curved sections 11 are symmetrical, thereby make the pre-bending degree at two ends of rail blank basic identical.
Cooling strain characteristics according to different length rail blank, the length of straightway 10 can be selected different number ranges with the ratio of the total length of rail blank, but the length of straightway 10 should to produce the length of cooling strain in cooling procedure hardly suitable substantially with the rail blank.
Preferably, for length at the rail blank more than 50 meters, the length that can select described straightway 10 be described rail blank (always) length 1/3 to 3/5.
Further preferably, the length of straightway 10 is 1/2 of described rail blank (always) length.
Preferably, smoothly extend in the pre-bending step in order to make the rail blank, avoid occurring bigger stress and concentrate, described straightway 10 and described curved section 11 are tangent.
In the pre-bending curve, the degree of crook of curved section 11 should be suitable substantially with the cooling strain degree of rail blank in cooling procedure, but direction is opposite.Be that bending direction in the pre-bending curve is opposite with the cooling strain direction of rail blank in cooling procedure, rectify antecurvature curvature to obtain the effect of glacing flatness preferably thereby can play to reduce.
Can select different curved section 11 according to different rail blanks, preferably, curved section 11 comprises first section 12 and second sections 13, and described second section 13 is connected between described first section 12 and the straightway 10, described first section 12 and second sections 13 tangent, as shown in Figure 3.
As seen from Figure 3, first section 12 degree of crook is greater than second section 13 degree of crook.This be because, first section 12 end that is positioned at the rail blank, and this end is bigger in the cooling strain degree in when cooling.
Preferably, described first section 12 length L 1 and second section 13 ratio along the length L 2 on straightway 10 length directions along the length direction of straightway 10 is 1/2 to 1/4.
Further preferably, described first section 12 length L 1 and second section 13 ratio along the length L 2 on straightway 10 length directions along the length direction of straightway 10 is 1/3.As mentioned above, along rail blank length direction, the cooling strain degree change is not uniform, but it is near more from the end of rail blank, the cooling strain degree change is rapid more, and therefore, first section 12 length L 1 along the length direction of straightway 10 will be lacked along the length L 2 on straightway 10 length directions with respect to second section 13, and first section 12 pre-bending degree in the pre-bending curve is also bigger.
Preferably, as shown in Figure 3, described first section 12 edge is 350 millimeters to 600 millimeters perpendicular to the distance W on the direction of described straightway 10 length directions 1, and described second section 13 edge is 850 millimeters to 1200 millimeters perpendicular to the distance W on the direction of described straightway 10 length directions 2.
By controlling the number range of above-mentioned W1 and W2, can control first section 12 and second sections 13 degree of crook, thereby can make pre-bending curve provided by the present invention be applicable to the rail manufacturing method of different operating modes.And above-mentioned number range comparatively is applicable to the manufacture method of length more than or equal to 50 meters rail blank.
More than the manufacture method of rail provided by the present invention is described in detail, and mainly the line style of the pre-bending curve in the pre-bending step involved in the present invention is described in detail.But those skilled in the art should be understood that; usually the aligning, cutting that also comprise cooling, the rail blank of rail blank in the rail manufacturing method are to obtain the process such as rail of desired parameters; these operations can be with reference to process commonly used traditionally, thereby concise and to the point or omitted description to these process in this specification.
To how in the rail manufacture process, implementing the pre-bending step be described below.
As shown in Figure 4, cooling bedly comprise the many longerons that are arranged in parallel 20 and be arranged on a plurality of pre-bending dollies 21 on each longeron 20 respectively movably.Pre-bending dolly 21 is driven to move back and forth along each self-corresponding longeron 20 by drive unit (as motor) respectively usually.Pre-bending dolly 21 is used for supporting rail blank 9, as shown in Figure 5.
The rail blank 9 of rolling acquisition has just entered the state of cooling bed pre-bending dolly 21 shown in the rail blank of the foot among Fig. 3.Pre-bending dolly 21 keeps straight line when initial position, because the rail blank of rolling acquisition 9 is straight at this moment substantially.
And along with the moving of pre-bending dolly 21, the difference of the translational speed (moving direction of pre-bending dolly 21 is shown in the arrow among Fig. 4) by making each pre-bending dolly 21 makes rail blank 9 form the shape of pre-bending curve.Specifically, the pre-bending dolly is when moving operation, and the speed of service of each dolly all can be set separately.In order to obtain pre-bending curve of the present invention, pre-bending dolly 21 speeds of service of middle straightway 10 (as shown in Figure 3) position are the fastest, and maintenance speed unanimity; And the pre-bending crab traversing speed of curved section 11 positions is all inequality, and is fastest near the pre-bending dolly of rail middle straight line segment, but the slowest near the little vehicle speed of pre-bending of end of rail position.Therefore, in pre-bending trolley travelling process, rail gradually becomes the pre-bending state that meets the pre-bending curve by the straightened condition of not pre-bending, when the pre-bending dolly is out of service, just finished pre-bending to rail, shown in the rail blank 9 of topmost among Fig. 4.
More than described the process of implementing pre-bending step of the present invention, wherein cooling bedly can adopt traditional cooling bedly, not specific (special) requirements is as long as require the pre-bending of rail blank for according to pre-bending curve of the present invention in the pre-bending process.
Usually, the pre-bending curve of the pre-bending step in the rail manufacturing method provided by the present invention is applicable to that length is not less than 50 meters rail blank 9.But this pre-bending curve is also applicable to the manufacture process of length than long steel.
More than rail manufacturing method provided by the present invention and the process of implementing this method are described, but being construed as, the description of this specification explains, those skilled in the art should be understood that, the content that the present invention comprised is not limited thereto, under the prerequisite that does not break away from essential scope of the present invention, can make various modifications, replacement and variation.
Claims (11)
1. the manufacture method of a rail, this method comprises: be the rail blank with high temperature billet steel is rolling; Cooling rail blank; And cooled rail blank made rail, described method also is included in the pre-bending step before the cooling rail blank, this pre-bending step comprises that cooling off deformation side naturally along the rail blank carries out prebuckling to this rail blank in the opposite direction, it is characterized in that the degree of crook of the pre-bending curve of described rail blank part from both ends to the middle reduces gradually.
2. method according to claim 1, wherein, described pre-bending curve comprises the straightway (10) that is positioned at mid portion and is connected to two curved sections (11) at this straightway (10) two ends.
3. method according to claim 2, wherein, described two curved sections (11) are symmetrical.
4. method according to claim 3, wherein, the length of described straightway (10) be described rail blank length 1/3 to 3/5.
5. method according to claim 4, wherein, the length of described straightway (10) be described rail blank length 1/2.
6. according to any described method among the claim 2-5, wherein, described straightway (10) is tangent with described curved section (11).
7. method according to claim 6, wherein, described curved section (11) comprises first section (12) and second section (13), and described second section (13) are connected between described first section (12) and the straightway (10), and described first section (12) are tangent with second section (13).
8. method according to claim 7, wherein, described first section (12) length ratio along the length direction of described straightway (10) is 1/2 to 1/4 along the length of the length direction of described straightway (10) and second section (13).
9. method according to claim 8, wherein, described first section (12) length ratio along the length direction of described straightway (10) is 1/3 along the length of the length direction of described straightway (10) and second section (13).
10. method according to claim 7, wherein, described first section (12) along being 350 millimeters to 600 millimeters perpendicular to the distance on the direction of described straightway (10) length direction, described second section (13) edge is 850 millimeters to 1200 millimeters perpendicular to the distance on the direction of described straightway (10) length direction.
11. method according to claim 1, wherein, the length of described rail blank is not less than 50 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102240117A CN102059528A (en) | 2009-11-17 | 2009-11-17 | Method for manufacturing steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102240117A CN102059528A (en) | 2009-11-17 | 2009-11-17 | Method for manufacturing steel rail |
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| CN102059528A true CN102059528A (en) | 2011-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102240117A Pending CN102059528A (en) | 2009-11-17 | 2009-11-17 | Method for manufacturing steel rail |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756248A (en) * | 2012-07-31 | 2012-10-31 | 朱强龙 | Manufacture process of ring cooling machine side track |
| CN103551437A (en) * | 2013-10-31 | 2014-02-05 | 武汉钢铁(集团)公司 | Microstress hectometer high-speed heavy rail production method |
| CN104874612A (en) * | 2015-05-15 | 2015-09-02 | 河北钢铁股份有限公司邯郸分公司 | Hundred-meter-rail double-arc reverse pre-bending process |
| CN107377641A (en) * | 2017-07-28 | 2017-11-24 | 河钢股份有限公司邯郸分公司 | A kind of cold bed pre-bending method before rail is strong |
| CN107962086A (en) * | 2017-11-30 | 2018-04-27 | 山信软件股份有限公司 | A kind of rolled piece pre-bending control method and device |
| CN109182715A (en) * | 2018-09-19 | 2019-01-11 | 武汉钢铁有限公司 | Rail burning optimization on line method for controlling planeness |
| CN109513748A (en) * | 2018-11-28 | 2019-03-26 | 攀钢集团攀枝花钢铁研究院有限公司 | For hundred meters of rail pre-bending methods before cooling |
| CN111468911A (en) * | 2020-04-07 | 2020-07-31 | 中冶东方工程技术有限公司 | Steel rail finishing method and production line |
| CN112718873A (en) * | 2020-12-14 | 2021-04-30 | 攀钢集团攀枝花钢钒有限公司 | Method for improving straightness of front end part of steel rail |
-
2009
- 2009-11-17 CN CN2009102240117A patent/CN102059528A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756248A (en) * | 2012-07-31 | 2012-10-31 | 朱强龙 | Manufacture process of ring cooling machine side track |
| CN102756248B (en) * | 2012-07-31 | 2015-06-10 | 朱强龙 | Manufacture process of ring cooling machine side track |
| CN103551437A (en) * | 2013-10-31 | 2014-02-05 | 武汉钢铁(集团)公司 | Microstress hectometer high-speed heavy rail production method |
| CN103551437B (en) * | 2013-10-31 | 2016-08-17 | 武汉钢铁(集团)公司 | A kind of hundred meters of high speed heavy rail production methods of microstress |
| CN104874612A (en) * | 2015-05-15 | 2015-09-02 | 河北钢铁股份有限公司邯郸分公司 | Hundred-meter-rail double-arc reverse pre-bending process |
| CN107377641A (en) * | 2017-07-28 | 2017-11-24 | 河钢股份有限公司邯郸分公司 | A kind of cold bed pre-bending method before rail is strong |
| CN107962086A (en) * | 2017-11-30 | 2018-04-27 | 山信软件股份有限公司 | A kind of rolled piece pre-bending control method and device |
| CN109182715A (en) * | 2018-09-19 | 2019-01-11 | 武汉钢铁有限公司 | Rail burning optimization on line method for controlling planeness |
| WO2020057538A1 (en) * | 2018-09-19 | 2020-03-26 | 武汉钢铁有限公司 | Steel rail inline heat treatment flatness control method |
| CN109513748A (en) * | 2018-11-28 | 2019-03-26 | 攀钢集团攀枝花钢铁研究院有限公司 | For hundred meters of rail pre-bending methods before cooling |
| CN111468911A (en) * | 2020-04-07 | 2020-07-31 | 中冶东方工程技术有限公司 | Steel rail finishing method and production line |
| CN112718873A (en) * | 2020-12-14 | 2021-04-30 | 攀钢集团攀枝花钢钒有限公司 | Method for improving straightness of front end part of steel rail |
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Application publication date: 20110518 |