CN109513748A - For hundred meters of rail pre-bending methods before cooling - Google Patents
For hundred meters of rail pre-bending methods before cooling Download PDFInfo
- Publication number
- CN109513748A CN109513748A CN201811433678.3A CN201811433678A CN109513748A CN 109513748 A CN109513748 A CN 109513748A CN 201811433678 A CN201811433678 A CN 201811433678A CN 109513748 A CN109513748 A CN 109513748A
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- rail
- bending
- hundred meters
- cooling
- before cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a kind of pre-bending methods, especially disclose one kind for hundred meters of rail pre-bending methods before cooling, belong to superlong steel rail Rolling Production manufacturing process technology field.There is provided it is a kind of can improve rail pre-bending precision for hundred meters of rail pre-bending methods before cooling.The pre-bending method by from the formation rolling rail that steel rail rolling machine exports before being sent into cooling bed cooling, through charging roller in the horizontal direction within the scope of the formation rolling full length rail by its pre-bending to defined radian.
Description
Technical field
The present invention relates to a kind of pre-bending methods, are used for hundred meters of rail pre-bending methods before cooling more particularly, to one kind, belong to
In superlong steel rail Rolling Production manufacturing process technology field.
Background technique
Hundred meters of steel rail rollings are completed after entering cold bed, due to the asymmetry of rail bottom, rail head, cause cooling procedure in thermal stress
Under the action of, the bending deformation of long rail head tail is formed, cause postorder steel rail straightening irregularity, rail finished product straightness not up to standard etc.
Problem.And the pre-bending processing for carrying out accuracy to full length rail can effectively solve the above problems.
According to the prior art, Shuo Jia Rail Production enterprise is using the cart system that roller-way entrance crossing system is exactly that we often say
Rail is transported to walking beam from inlet roller way by system, and completes pre-bending in period.
However this technical disadvantages are shown: there are also pending accuracy pre-bendings within the scope of full length rail；Rail is because pushing away steel
Easily the defects of surface generates scratch；When Rail Production, high temperature rolled piece is parked at charging roller for a long time, causes roller-way bearing
High-temperature baking is born with driving gear-box.
Summary of the invention
The technical problems to be solved by the present invention are: provide it is a kind of can improve rail pre-bending precision for hundred meters of rail it is cold
But the pre-bending method before.
Used technical solution is to solve above-mentioned technical problem: one kind being used for hundred meters of rail pre-bending sides before cooling
Method, the pre-bending method by from the formation rolling rail that steel rail rolling machine exports before being sent into cooling bed cooling, by upper
Expect roller-way in the horizontal direction within the scope of the formation rolling full length rail by its pre-bending to defined radian.
Further, the pre-bending amount at each position is determined by following ranges during the pre-bending of formation rolling rail,
Pre-bending amount y1 within the scope of 0~20m of both ends meets 0≤y1≤2250 (K1R1+K2R2), and wherein R1, R2 distinguish table
Showing vertical bending and lateral bending, K1, K2 are bent vertically respectively and the bending coefficient of lateral bending,
Pre-bending amount y2 within the scope of 20~80m of centre meets 2000mm≤y2≤2500mm.
The preferred mode of the above solution is that along its length, the formation rolling rail both ends after pre-bending are in rounding off
Arc-shaped, which is no more than 2500mm.
Further, formation rolling rail described in pre-bending is led by having for the charging roller in the horizontal direction
To the cantilever extension drive roller of wheel rim, elongation in the horizontal direction drives its of the formation rolling rail of both ends fixation
Its part is displaced sideways completion in the horizontal plane.
The preferred mode of the above solution is that exporting the molding of steel rail rolling machine before formation rolling rail described in pre-bending
Roll out steel rail is lifted up pre-bending again after at least 25 ㎜ by the elevating rocker arm of the charging roller.
Further, cooling bed driving chain is returned under shaped steel rail after the completion of roll out steel rail pre-bending to be formed
Formation rolling rail is placed on the driving chain by side, the elevating rocker arm still further below.
The preferred mode of the above solution is that the cantilever extension drive roller for each group charging roller stopped using is logical
It crosses the elevating rocker arm and is decreased below 300 ㎜ at the top of cooling bed driving chain.
Further, the charging roller along pre-bending rail length direction sequence arrangement is multiple groups, each group charging roller
After the arc-shaped and pre-bending that endpoint after the cantilever extension drive roller is horizontally elongated is constituted at shaped steel rail
It is arc-shaped to be adapted.
Further, the temperature since the formation rolling rail that steel rail rolling machine exports when pre-bending is not less than 900 DEG C.
The beneficial effects of the present invention are: the pre-bending method of the application will be rolled by charging roller in the molding in the horizontal direction
By its pre-bending to defined radian within the scope of full length rail processed.It changes and needs to realize pre-bending by cart system in the prior art
Operation, so as to be scraped during avoiding high temperature rail in pre-bending while guaranteeing formation rolling rail pre-bending precision
The generation of the defects of hurting, distorting situation, improves the final product quality of hundred meters of superlong steel rails.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the charging roller that the present invention is related to for hundred meters of rail pre-bending methods before cooling；
Fig. 2, Fig. 3 be the present invention for hundred meters of rail pre-bending methods before cooling it is pre- when charging roller cantilever extension
The operation schematic diagram of drive roller；
Fig. 4 is the multiple groups charging roller pre-bending rail that the present invention is related to for hundred meters of rail pre-bending methods before cooling
Rough schematic view.
In the figure, it is marked as formation rolling rail 1, charging roller 2, cantilever extension drive roller 3, elevating rocker arm 4.
Specific embodiment
As shown in Figure 1, Figure 2, be shown in Fig. 3 and Fig. 4 it is provided by the invention it is a kind of can improve rail pre-bending precision for hundred
Rice rail pre-bending method before cooling.The formation rolling rail 1 exported from steel rail rolling machine is being sent by the pre-bending method
Before cooling bed cooling, through charging roller 2 in the horizontal direction in 1 length range of formation rolling rail by its pre-bending to rule
Fixed radian.The pre-bending method of the application in the horizontal direction will be in 1 length range of formation rolling rail by charging roller 2
By its pre-bending to defined radian.The operation for needing that pre-bending is realized by cart system in the prior art is changed, so as to
The defects of being scraped off, distort during avoiding high temperature rail in pre-bending while guaranteeing formation rolling rail pre-bending precision situation
Generation, improve the final product quality of hundred meters of superlong steel rails.
According to statistical law, in order to guarantee the straightness of rail after cooling, pre-bending of the application in formation rolling rail 1
In the process, the pre-bending amount at each position is determined by following ranges, 0≤y1 of pre-bending amount y1 satisfaction within the scope of 0~20m of both ends≤
2250 (K1R1+K2R2), wherein R1, R2 respectively indicate vertical bending and lateral bending, and K1, K2 are respectively vertical bending and lateral
Curved bending coefficient, the pre-bending amount y2 within the scope of 20~80m of centre meet 2000mm≤y2≤2500mm.And along length side
To for the formation rolling rail 1 after pre-bending in the arc-shaped of rounding off, which is no more than 2500mm.
In above embodiment, in order to guarantee the rail not damaged under the condition of high temperature during pre-bending to greatest extent
Surface, formation rolling rail 1 described in pre-bending is by the charging roller 2 with guiding wheel rim to the application in the horizontal direction
Cantilever extension drive roller 3, the other portions for the formation rolling rail 1 that elongation in the horizontal direction drives both ends fixed
Lateral movement in the horizontal plane is divided to complete.And before the formation rolling rail 1 described in pre-bending, make to export steel rail rolling machine
Formation rolling rail 1 is lifted up pre-bending again after at least 25 ㎜ by the elevating rocker arm 4 of the charging roller 2.Then, to be formed
After the completion of 1 pre-bending of roll out steel rail, cooling bed driving chain is returned to 1 lower section of formation rolling rail, and the elevating rocker arm 4 is again
Formation rolling rail 1 is placed on the driving chain downwards.Along the feeding roller of pre-bending rail length direction sequence arrangement
Road 2 is multiple groups, what the endpoint after the cantilever extension drive roller 3 of each group charging roller 2 is horizontally elongated was constituted
The arc-shaped of the arc-shaped formation rolling rail 1 with after pre-bending is adapted.And guarantee to roll from the molding that steel rail rolling machine exports
Temperature when rail 1 processed starts pre-bending is not less than 900 DEG C.
Further, in conjunction with charging roller 2 described herein further include low level Synchronous pull rod, upright decelerating motor,
Elevating rocker arm group, self locking hydraulic cylinder, lifting seat, lifting hydraulic cylinder and cantilever extension transmission roller group with guiding wheel rim etc.
Component is bolted to unit base, lifting hydraulic cylinder installation further according to low level Synchronous pull rod connection elevating rocker arm group together
On lifting seat, self locking hydraulic cylinder is controlled in elevating rocker arm group, and the cantilever extension transmission roller group with guiding wheel rim passes through spiral shell
It tethers and is connected on base.When work, drive roller is risen to extreme higher position by lifting hydraulic cylinder, is started self locking hydraulic cylinder, will be locked
Tight turn key pulls locked position, allows lifting hydraulic cylinder release, and roller is fallen after rise, and locking turn key withstands elevating rocker arm, return roller
Road lifting hydraulic cylinder increases drive roller, loosens locking turn key, then leave locked position with locked hydraulic cylinder plate turn key,
The characteristics of falling drive roller after rise.In order to protect the hydraulic system of charging roller 2 described herein, the application makes to stop using
Each group charging roller 2 the cantilever extension drive roller 3 by the elevating rocker arm 4 be decreased below it is cooling bed
300 ㎜ at the top of driving chain, i.e., far from hot environment.
It is briefly described below in the engineering process of the application, as shown in Figure 2,3,
Step 1: elevating rocker arm 4 synchronizes lift rail straight up under the action of Synchronous pull rod；Synchronize the mesh lifted
Be to make rail can smoothly enter into cold bed, so as to cold bed transport rail transmission chain transmit rail；
Step 2: carry out the rail pre-bending of second step after lifting certain altitude, i.e., it is flexible in the cantilever with guiding wheel rim
Pre-bending is carried out under the action of formula drive roller 2 in the horizontal direction, pre-bending amount is different according to rail type and changes；
Step 3: being moved to the cantilever with guiding wheel rim after the completion of rail pre-bending to cold bed transport rail transmission chain and stretching
2 lower section of contracting formula drive roller, elevating rocker arm 4 is synchronous straight down to reduce rail, the process under the action of Synchronous pull rod at this time
Middle rail just transports rail transmission chain displacement support by cold bed, completes rail handover support.
Embodiment one
The charging roller of development can be there are two types of different working methods:
1, rolled piece is lifted away from charging roller by the long distance elevating that beam is moved with step cooling bed.With the raise-lower hydraulic of charging roller
Drive roller is risen to extreme higher position by cylinder, starts locked hydraulic cylinder, and locking turn key is pulled locked position, allows lifting hydraulic cylinder
Release, roller fall about 5mm after rise, and locking turn key withstands elevating rocker arm, at this point, roller-way roll surface is higher than the quiet beam table top of step cooling bed about
25mm.In entire production, charging roller only do start, slow down, braking maneuver, roller-way itself no longer moves up and down；Production
After, first drive roller is increased with roller-lifting hydraulic cylinder, makes to lock turn key and loosen, then with locked hydraulic cylinder plate turn key
Locked position is left, drive roller is then preferably minimized position with lifting hydraulic cylinder.
2, charging roller often send a rolled piece to do an elevating movement.When feeding, with lifting hydraulic cylinder by drive roller liter
To highest point, the roll surface of drive roller is made to be higher than the quiet 25~30mm of beam of step cooling bed, under the guiding wheel rim control of drive roller,
Rolled piece is sent on cold bed, rolled piece in place after, decelerating through motor, braking, stalling, lifting hydraulic cylinder drive drive roller decline about
Rolled piece is put on the Jing Liang of step cooling bed by 80mm, and step cooling bed moves Liang Shangsheng, is lifted rolled piece and is taken a step forward, lifting hydraulic cylinder
It drives drive roller to be raised to highest point again, prepares next rolled piece of conveying, after production, lifting hydraulic cylinder is by drive roller
It is preferably minimized position.
The application can meet TB/T 3276-2011 requirement with the chemical component of the rail of pre-bending, be maintained at high after hot rolling
The 60kg/m rail of temperature state carries out rail pre-bending processing using method of the invention and device shown in the drawings.Other conditions
Be: the head surface temperature that rail is begun to cool is 900 DEG C, and rail pre-bending amount is respectively as follows: full length rail 20-80m released amount and is
2500mm, both ends 20m released amount are successively successively decreased with every meter of 80mm, circulating fan continuous service under the big cold bed of step-by-step movement, steel
Rail aligning is using flat vertical compound straightening, and plain-barreled roll drafts is successively are as follows: 15mm, 9mm, 4mm, 0mm found rod drafts successively are as follows:
7mm、4mm、0mm。
Meet the rail finished product straightness of above-mentioned technique are as follows:
Claims (9)
1. one kind is used for hundred meters of rail pre-bending methods before cooling, it is characterised in that: the pre-bending method will be from steel rail rolling
The formation rolling rail (1) of machine output is before being sent into cooling bed cooling, by charging roller (2) in the horizontal direction in the molding
By its pre-bending to defined radian in roll out steel rail (1) length range.
2. according to claim 1 be used for hundred meters of rail pre-bending methods before cooling, it is characterised in that: in formation rolling steel
During the pre-bending of rail (1), the pre-bending amount at each position is determined by following ranges,
Pre-bending amount y1 within the scope of 0~20m of both ends meets 0≤y1≤2250 (K1R1+K2R2), and wherein R1, R2 respectively indicate perpendicular
Straight bending and lateral bending, K1, K2 are respectively the bending coefficient of vertical bending and lateral curved tribute,
Pre-bending amount y2 within the scope of 20~80m of centre meets 2000mm≤y2≤2500mm.
3. according to claim 2 be used for hundred meters of rail pre-bending methods before cooling, it is characterised in that: along its length,
In the arc-shaped of rounding off, which is no more than 2500mm at formation rolling rail (1) both ends after pre-bending.
4. according to claim 2 or 3 be used for hundred meters of rail pre-bending methods before cooling, it is characterised in that: along level side
It to formation rolling rail (1) described in pre-bending is passed by the cantilever extension with guiding wheel rim of the charging roller (2)
Dynamic roller (3), the other parts for the formation rolling rail (1) that elongation in the horizontal direction drives both ends fixed are in horizontal plane
What interior lateral movement was completed.
5. according to claim 4 be used for hundred meters of rail pre-bending methods before cooling, it is characterised in that: described in pre-bending
Before formation rolling rail (1), the formation rolling rail (1) of output steel rail rolling machine is shaken by the lifting of the charging roller (2)
Arm (4) is lifted up pre-bending again after at least 25 ㎜.
6. according to claim 5 be used for hundred meters of rail pre-bending methods before cooling, it is characterised in that: rolled steel to be formed
After the completion of rail (1) pre-bending, cooling bed driving chain is returned to below formation rolling rail (1), and the elevating rocker arm (4) is again
Formation rolling rail (1) is placed on the driving chain downwards.
7. according to claim 6 be used for hundred meters of rail pre-bending methods before cooling, it is characterised in that: that stops using is each
The cantilever extension drive roller (3) of group charging roller (2) is decreased below cooling bed by the elevating rocker arm (4)
Driving chain at the top of 300 ㎜.
8. according to claim 4 be used for hundred meters of rail pre-bending methods before cooling, it is characterised in that: long along pre-bending rail
The charging roller (2) for spending direction sequence arrangement is multiple groups, the cantilever extension drive roller (3) of each group charging roller (2)
The arc-shaped of formation rolling rail (1) after the arc-shaped and pre-bending that endpoint after horizontally elongated is constituted is adapted.
9. according to claim 1 be used for hundred meters of rail pre-bending methods before cooling, it is characterised in that: from steel rail rolling machine
Temperature when the formation rolling rail (1) of output starts pre-bending is not less than 900 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811433678.3A CN109513748B (en) | 2018-11-28 | 2018-11-28 | Pre-bending method used before cooling of hectometer steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811433678.3A CN109513748B (en) | 2018-11-28 | 2018-11-28 | Pre-bending method used before cooling of hectometer steel rail |
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| CN109513748A true CN109513748A (en) | 2019-03-26 |
| CN109513748B CN109513748B (en) | 2020-11-24 |
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| CN201811433678.3A Active CN109513748B (en) | 2018-11-28 | 2018-11-28 | Pre-bending method used before cooling of hectometer steel rail |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2018
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| 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 |
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| CN109513748B (en) | 2020-11-24 |
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