CN101474638A - Air cooling stacking method of hot rolling steel rail - Google Patents
Air cooling stacking method of hot rolling steel rail Download PDFInfo
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- CN101474638A CN101474638A CNA2009103002830A CN200910300283A CN101474638A CN 101474638 A CN101474638 A CN 101474638A CN A2009103002830 A CNA2009103002830 A CN A2009103002830A CN 200910300283 A CN200910300283 A CN 200910300283A CN 101474638 A CN101474638 A CN 101474638A
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- rail
- air cooling
- stacking
- cooling
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Abstract
The invention discloses a hot-rolled steel air cooling and stacking method capable of reducing bending of a rail to ensure straightness of the straightened rail to meet standard requirement. The method comprises the following steps: A. laterally laying the rolled rail on a collection bracket for cooling; B. turning over the rail during a cooling process by 180 degrees; C. transferring the turned rail to a stacking position for stacking and air cooling. An original upper side of the rail is turned to be a lower side and the original lower side of the rail is turned to be the upper side after turning over the rail which is laterally laid on the collection bracket and cooled by 180 degrees, thus ensuring uniform cooling of the two sides of the rail and substantially equalizing heat storage of the upper side and the lower side of the rail before cooling, further reducing deformation difference resulting from thermal stress and reducing rail bending of the upper side and the lower side. The lateral bending of the straightened rail which is cooled to the room temperature meets the standard requirement.
Description
Technical field
The present invention relates to the production of rail, be specifically related to the air cooling clamp method of hot rolled rail.
Background technology
At present, in the production process of rail, it is that before the steel rail straightening one must be through step that rail is carried out the stacking air cooling." stacking " is meant rail is deposited in rail is concentrated, pile up middle database and wait to align.Rail contacts with air during stacking, and progressively cooling, after rail is being piled up neatly cool to room temperature on the position (or aligning the temperature that needs), rail could be sent into equipment for straightening and align.
Specifically, the existing step that rail carries out the stacking air cooling comprises: after rail shuts out from roll line, rail is sidelong on collecting frame collects earlier, this moment, the rail head of rail was northwards lain on one's side on stand without exception; By the lifting finger on the collecting frame 90 ° of rail turnovers are become upright states then, this moment rail rail head up, the bottom surface of the flange of rail contacts with the horizontal plane of stand; The rail that will be turned into upright state again hangs in burial pit and carries out slow cooling; Again rail is carried out the stacking air cooling at last.When rail slow cooling and stacking, rail remains upright state.Burial pit is shape pond, a kind of rectangular hole, and there is heat-barrier material the inboard in its pond.When hot rolled rail is cooled to 550 ℃ of left and right sides on stand, concentrate again and hang in burial pit, slowly cool off, hydrogen remaining in the rail is overflowed, prevent that white-spot defects from appearring in rail.
Because in the air cooling clamp method of above-mentioned this hot rolled rail, rail will carry out slow cooling earlier in burial pit before stacking, thereby can discharge uneven thermal deformation stress, thus more straight during the rail stacking, can reach standard-required behind the aligning.Yet, popularize along with molten steel is vacuum treated, at present rolling rail cancel all annealing process, thereby the stacking air cooling of making the rail that comes to hot rolling has proposed new problem: if still rail turnover become upright state on collecting frame, uprightly stack when making the rail stacking, then rail can discharge uneven thermal deformation stress by burial pit because of not advancing, so the macrobending to rail head one side that meeting generation head, end thermal capacity difference form before the stacking, and the formation of falling the steel of upright shakiness weighs wounded on the buttress; And if rail is not made any steel that turns over before stacking, the state of being sidelong when promptly remaining the rail tapping, then rail is in rolling and cooling procedure on stand, invar rail downside radiating condition far is worse than upper side, the heat that rail is accumulated at downside is also just far more than upper side, like this after rail cools off fully, will occur that the side thermal stress is poor up and down, cause rail to accumulate many direction bendings, cause flexibility can't rectify out the rail that meets the glacing flatness standard-required too greatly to heat.
Summary of the invention
Technical problem solved by the invention is: for overcoming because of having cancelled the burial pit slow cooling, make rail stacking cooling back cause the undesirable problem of rectifying out of rail glacing flatness too greatly because of flexibility, a kind of air cooling clamp method that reduces the hot rolled rail of rail flexibility is provided, thereby guarantees that the glacing flatness of aligning back rail reaches the requirement of standard.
The technical scheme that solves the problems of the technologies described above is: the air cooling clamp method of hot rolled rail comprises the steps:
A. the rail that rolls out is sidelong on collecting frame and cools off;
B. in cooling procedure, described rail is carried out 180 ° of upsets;
C. the rail after will overturning is transported to the buttress position and carries out the stacking air cooling.
The invention has the beneficial effects as follows: will be sidelong the rail that cools off on the collecting frame carry out 180 the degree ° upset after, make original rail upper side upset be downside, rail downside upset originally is upper side, evenly cool off the both sides that guarantee rail, up and down the heat storage amount of side is suitable substantially before cooling fully to make rail, the distortion difference that thermal stress produces is dwindled, and the rail of side is crooked up and down reduces; When adopting this mode to carry out the stacking air cooling, can also utilize the weight of rail self to proofread and correct to the side direction of rail is curved.Through aforesaid way, make the rail that is cooled to room temperature reach standard-required to bending through the aligning rear side.
Description of drawings
Fig. 1 transports schematic diagram for the rail of the air cooling clamp method of hot rolled rail of the present invention.
Fig. 2 is the arrangement schematic diagram before the rail turnover of the present invention.
Fig. 3 is the arrangement schematic diagram behind the rail turnover of the present invention.
Direction shown in the arrow is the traffic direction of rail among Fig. 1～Fig. 3.
Be labeled as among the figure: rail hot rolling line 1, rail 2, collecting frame 3, tilting gear 4, magnetic-type crane 5, buttress position 6.
The specific embodiment
The present invention is described further below in conjunction with drawings and Examples.
The air cooling clamp method of hot rolled rail of the present invention comprises the steps:
A. the rail 2 that rolls out is sidelong on collecting frame 3 and cools off;
B. in cooling procedure, described rail 2 is carried out 180 ° of upsets;
C. the rail 2 after will overturning is transported to buttress position 6 and carries out the stacking air cooling.
Specifically, as shown in Figure 1, because rail 2 is in the state of being sidelong in the continuous rolling process, be subjected to the influence of space and cooling medium, the downside radiating condition of rail 2 far is worse than upper side when rolling.Rail 2 from rail hot rolling line 1 is rolling come out after, temperature is about 900 ℃.Be transported to the inlet of collecting frame 3 by transmission roller channel with rail 2 this moment, then with drawing the steel dolly that rail 2 is cooled off by before collecting the tilting gear 4 that is arranged in collecting frame 3.The state of being sidelong when rail 2 keeps it rolling at this moment promptly be sidelong on collecting frame 3, and rail head is towards unanimity.As shown in Figure 2, because rail 2 is sidelong, so the upper side of rail 2 directly contacts with air, and downside contacts with collecting frame 3.The height of 1m because collecting frame 3 and ground surface are had an appointment, the space between the collecting frame 3 and the face of land exuberant fully hot-air, therefore when rail 2 cooled off on collecting frame 3, the cooling velocity of its downside also was lower than the cooling velocity of upper side.For above-mentioned reasons, the heat accumulated far more than upper side of the heat that this moment, rail 2 downsides were accumulated.As Fig. 3, after rail 2 is cooled to certain temperature, by tilting gear 4 rail 2 is carried out 180 ° of upsets again, make the fast upper side upset of rail 2 original cooling velocities be downside, originally the upset of the slow downside of cooling velocity is upper side, thus two sides that guarantee rail 2 evenly cool off, the accumulation of side is suitable substantially before cooling fully up and down to make rail, the distortion difference that thermal stress produces is dwindled, and the rail of side is crooked up and down reduces.As Fig. 1, turn over after steel finishes, with drawing the steel dolly that rail 2 is sent to the exit position of collecting frame 3, when treating that rail 2 reaches the temperature that is fit to 5 handlings of magnetic-type crane, by magnetic-type crane 5 the stacking air cooling is carried out in rail handling to buttress position 6 again.Rail stacking air cooling to temperature that aligning needs on buttress position 6 just can be aligned.Rail 2 aligning back flexibility can reach the requirement of standard.
Adopt aforesaid way to carry out the stacking air cooling, can also utilize the weight of rail self to proofread and correct the side direction of rail is curved.In addition, because rail 2 stackings that when stacking, be layering, so the relative easier heat transfer in side between adjacent upper strata rail and the lower floor rail.This heat-transfer character when utilizing rail 2 stackings can remain the state of being sidelong after rail 2 is in upset when rail 2 stackings.Like this, can guarantee better that the two sides of each rail 2 cool off uniformly, reduce the bending of rail 2.
Embodiment
When rail 2 is cooled to 600 ℃～700 ℃ on collecting frame 3, by tilting gear 4 it is carried out 180 ° of upsets, like this when the two sides of rail 2 when reducing to 300 ℃～400 ℃ left and right sides, the cooling velocity of its two sides is suitable substantially.Rail 2 after the upset is cooled to 300 ℃～400 ℃ on collecting frame, and then rail 2 is transported to buttress position carries out the stacking air cooling.When rail 2 during at 300 ℃～400 ℃, be suitable for carrying out handling, and rail 2 carries out the stacking air cooling in the time of 300 ℃～400 ℃ with magnetic-type crane 5, fully after the cooling, the both sides thermal deformation stress basically identical of rail 2.When rail 2 is carried out stacking, between adjacent upper strata rail and lower floor's rail, dottle pin is set, thereby, is convenient to the crane handling separating between rail layer and the layer.
Claims (5)
- The air cooling clamp method of [claim 1] hot rolled rail comprises the steps:A. the rail that rolls out is sidelong on collecting frame and cools off;B. in cooling procedure, described rail is carried out 180 ° of upsets;C. the rail after will overturning is transported to the buttress position and carries out the stacking air cooling.
- The air cooling clamp method of [claim 2] hot rolled rail as claimed in claim 1 is characterized in that: when rail is cooled to 600 ℃～700 ℃, it is carried out 180 ° of upsets.
- The air cooling clamp method of [claim 3] hot rolled rail as claimed in claim 1 or 2 is characterized in that: the rail after will overturning is cooled to 300 ℃～400 ℃ on collecting frame, and then rail is transported to buttress position carries out the stacking air cooling.
- The air cooling clamp method of [claim 4] hot rolled rail as claimed in claim 1 is characterized in that: keep the state consistency of being sidelong after rail and its upset during stacking.
- The air cooling clamp method of [claim 5] hot rolled rail as claimed in claim 1 is characterized in that: between adjacent upper strata rail and lower floor's rail dottle pin is set during stacking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009103002830A CN101474638A (en) | 2009-01-20 | 2009-01-20 | Air cooling stacking method of hot rolling steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009103002830A CN101474638A (en) | 2009-01-20 | 2009-01-20 | Air cooling stacking method of hot rolling steel rail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101474638A true CN101474638A (en) | 2009-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009103002830A Pending CN101474638A (en) | 2009-01-20 | 2009-01-20 | Air cooling stacking method of hot rolling steel rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101474638A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862287A (en) * | 2017-01-09 | 2017-06-20 | 华峰铝业有限公司 | A kind of preparation method of hot rolled steel plate |
| CN107475494A (en) * | 2017-07-21 | 2017-12-15 | 河钢股份有限公司邯郸分公司 | A kind of control method of air-cooled bainitic steels bloom bending |
-
2009
- 2009-01-20 CN CNA2009103002830A patent/CN101474638A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862287A (en) * | 2017-01-09 | 2017-06-20 | 华峰铝业有限公司 | A kind of preparation method of hot rolled steel plate |
| CN106862287B (en) * | 2017-01-09 | 2019-07-23 | 华峰铝业有限公司 | A kind of preparation method of hot rolled steel plate |
| CN107475494A (en) * | 2017-07-21 | 2017-12-15 | 河钢股份有限公司邯郸分公司 | A kind of control method of air-cooled bainitic steels bloom bending |
| CN107475494B (en) * | 2017-07-21 | 2019-04-23 | 河钢股份有限公司邯郸分公司 | A kind of curved control method of air-cooled bainitic steels bloom |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090708 |