CN109371219A - Pearlite steel rail on-line processing method - Google Patents
Pearlite steel rail on-line processing method Download PDFInfo
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- CN109371219A CN109371219A CN201811458189.3A CN201811458189A CN109371219A CN 109371219 A CN109371219 A CN 109371219A CN 201811458189 A CN201811458189 A CN 201811458189A CN 109371219 A CN109371219 A CN 109371219A
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- rail
- steel rail
- pearlite steel
- pearlite
- rocker arm
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention, which discloses, is related to technical field of metal heat treatment more particularly to a kind of pearlite steel rail on-line processing method, includes the following steps: a, is conveyed by elevating steel raising and shifting machine to pearlite steel rail；B, in pearlite steel rail transmission process, elevating steel raising and shifting machine applies active force to pearlite steel rail, and pearlite steel rail is made to realize the bending deformation of S type or circular arc bending deformation in the horizontal plane；C, pearlite steel rail is delivered to Heat treating machine set inlet；D, into the pearlite steel rail temperature of Heat treating machine set between 760-900 DEG C；E, cooling device is provided in Heat treating machine set, cooling device accelerates to cool down to pearlite steel rail.The present invention can be improved rail strength and toughness, reduce steel rail web residual stress, improve the comprehensive performance of rail, reduces the occurrence probability of pearlite steel rail rolling contact fatigue, improves the whole service life of rail.
Description
Technical field
The present invention relates to technical field of metal heat treatment more particularly to a kind of pearlite steel rail on-line processing methods.
Background technique
China railways are in high speed development stage, high speed passenger transportation industrial railway, passenger-cargo mixed fortune railway, Heavy-haul Freight at present
Industrial railway build quickly, on a large scale, increasing to the demand of rail.
Pearlite steel rail have preferable mechanical property and contact fatigue patience, service life with higher, increasingly
Mostly used.The production technology of pearlite steel rail are as follows: first by converter smelting, LF refining, then pass through RH application of vacuum, warp
Continuous casting obtains steel billet, and finally steel billet is rolled and is heat-treated.Currently, using air-cooled mode to the pearlite steel rail after rolling
It is cooled down, cooling rate is uneven, and rail property is poor, and is easy to produce biggish residual stress, while it is flat to influence rail
Straight degree, improves the occurrence probability of rolling contact fatigue, influences the overall performance of rail, reduce the whole service life of rail.
Summary of the invention
To overcome existing drawbacks described above during existing heat-treatment of rail, the technical problems to be solved by the invention
It is: a kind of on-line processing method that can improve pearlite steel rail comprehensive performance is provided.
The technical solution adopted by the present invention to solve the technical problems is: pearlite steel rail on-line processing method, including such as
Lower step:
A, the pearlite steel rail after rolling is placed on by the temperature of the pearlite steel rail after rolling between 840-1000 DEG C
On elevating steel raising and shifting machine, pearlite steel rail is conveyed by elevating steel raising and shifting machine；
B, in pearlite steel rail transmission process, elevating steel raising and shifting machine applies active force to pearlite steel rail, makes pearly-lustre
For body rail when being delivered to Heat treating machine set inlet, pearlite steel rail realizes the bending deformation of S type or circular arc in the horizontal plane
Bending deformation；
C, pearlite steel rail is delivered to Heat treating machine set inlet；
D, pearlite steel rail is put into Heat treating machine set, and the pearlite steel rail temperature for entering Heat treating machine set exists
Between 760-900 DEG C；
E, cooling device is provided in Heat treating machine set, cooling device applies pearlite steel rail and accelerates cooling medium, makes
Pearlite steel rail temperature is down to 400-500 DEG C, and pearlite steel rail temperature stops applying after being down to 400-500 DEG C accelerates cooling be situated between
Matter, pearlite steel rail are cooled to room temperature by air.
Further, rail head tyre tread, rail head two sides, rail head in step e, using cooling device to pearlite steel rail
At the one of web of the rail junction and rail bottom center or many places, which apply, accelerates cooling medium.
Further, in step e, when cooling device applies acceleration cooling medium to pearlite steel rail, pearlite
The cooling velocity of rail is between 1-5 DEG C/s.
Further, cooling medium is the mixture of compressed air, water mist or compressed air and water mist.
Further, elevating steel raising and shifting machine includes at least three groups of lift moving devices, all lift moving devices are arranged at intervals on
On the conveying circuit of pearlite steel rail, lift moving device includes lifting body, transfer mechanism；
Lifting body includes guide rail beam, the first elevating rocker arm, the second elevating rocker arm, hydraulic cylinder, the first firm banking,
Two firm bankings, first rotating shaft, the second shaft, rocker arm, the upper end of the first elevating rocker arm and the side of guide rail beam are articulated and connected, the
The lower end of one elevating rocker arm is connected with first rotating shaft, and the upper end of the second elevating rocker arm and the other side of guide rail beam are articulated and connected,
The lower end of second elevating rocker arm is connected with the second shaft, and guide rail beam, the first elevating rocker arm, the second elevating rocker arm constitute parallel
Quadrangular mechanism, first rotating shaft are rotatably arranged on the first firm banking, and the second shaft is rotatably arranged on the second firm banking,
One end of rocker arm is connected with first rotating shaft, and the other end of rocker arm and the piston rod end of hydraulic cylinder are articulated and connected, hydraulic oil
The bottom of cylinder and the first firm banking are articulated and connected；
Transfer mechanism includes guide rail, walking dolly, motor, transmission chain, rail fastening, and guide rail is arranged on guide rail beam,
Walking dolly matching is arranged on guide rail, and the side of guide rail beam is arranged in motor, and transmission chain can make to walk under motor effect
Trolley is moved back and forth along guide rail, and rail fastening is hingedly arranged on walking dolly.
Further, further including connecting rod, the first firm banking of all lift moving devices links together.
Further, further including programmable controller, motor, the hydraulic cylinder of all lift moving devices pass through signal data
Line is connected with programmable controller.
Further, the start of a run of the walking dolly of each lift moving device, stroke end go out to be provided with close to switch,
It is provided on walking dolly close to inductive switching plate, is connected close to inductive switching plate by signal data line with programmable controller
It connects.
Further, guide rail beam remains horizontal.
The beneficial effects of the present invention are: during conveying pearlite steel rail by elevating steel raising and shifting machine, lifting lift steel
Machine for moving steel applies active force to pearlite steel rail, makes pearlite steel rail when being delivered to Heat treating machine set inlet, pearlitic steel
Rail realizes the bending deformation of S type or circular arc bending deformation in the horizontal plane, guarantees the base that pearlite steel rail mechanical property does not reduce
The internal residual stress that rail is reduced on plinth, improves the comprehensive performance and service life of rail；When being heat-treated, by cold
But device applies pearlite steel rail and accelerates cooling medium, so that pearlite steel rail is quickly cooled the temperature to 400-500 DEG C, Neng Gouxi
Change rail pearlite piece interlamellar spacing, further increases the intensity and toughness of rail；Simultaneously pearlite steel rail carry out heat treatment open
When the beginning, temperature is controlled between 760-900 DEG C, make pearlite steel rail to open cold temperature essentially identical, reduce pearlite steel rail it
Between Mechanical Fluctuation, improve the consistency of performance of pearlite steel rail, it is seen then that the present invention can be improved the comprehensive of pearlite steel rail
Performance is closed, the occurrence probability of pearlite steel rail rolling contact fatigue is reduced, improves the whole service life of rail, is conducive to promote.
Detailed description of the invention
Fig. 1 is elevating steel raising and shifting machine overlooking structure diagram；
Fig. 2 is the structural schematic diagram for lifting moving device；
In figure label for lift moving device 1, connecting rod 10, guide rail beam 11, the first elevating rocker arm 12, the second elevating rocker arm 13,
Hydraulic cylinder 14, the first firm banking 15, the second firm banking 16, first rotating shaft 17, the second shaft 18, rocker arm 19, guide rail 21,
Walking dolly 22, motor 23, transmission chain 24, rail fastening 25, close to switch 26, close to inductive switching plate 27.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Pearlite steel rail on-line processing method provided by the present invention, includes the following steps:
A, the pearlite steel rail after rolling is placed on by the temperature of the pearlite steel rail after rolling between 840-1000 DEG C
On elevating steel raising and shifting machine, pearlite steel rail is conveyed by elevating steel raising and shifting machine；
B, in pearlite steel rail transmission process, elevating steel raising and shifting machine applies active force to pearlite steel rail, makes pearly-lustre
For body rail when being delivered to Heat treating machine set inlet, pearlite steel rail realizes the bending deformation of S type or circular arc in the horizontal plane
Bending deformation；
C, pearlite steel rail is delivered to Heat treating machine set inlet；
D, pearlite steel rail is put into Heat treating machine set, and the pearlite steel rail temperature for entering Heat treating machine set exists
Between 760-900 DEG C；
E, cooling device is provided in Heat treating machine set, cooling device applies pearlite steel rail and accelerates cooling medium, makes
Pearlite steel rail temperature is down to 400-500 DEG C, and pearlite steel rail temperature stops applying after being down to 400-500 DEG C accelerates cooling be situated between
Matter, pearlite steel rail are cooled to room temperature by air.
By weight percentage, the ingredient of pearlite steel rail are as follows: C:0.70-0.86%, Si:0.10-1.00%, Mn:
0.10-1.20%, P≤0.030%, S≤0.030%, V:0.01-0.15%, Cr:0.01-1.00%, surplus are Fe and miscellaneous
Matter.Pearlite steel rail tunneling boring is made of lamellar pearlite tissue and ferritic structure, by weight percentage, lamellar pearlite
The content of tissue is 99.0-99.5%, and the content of ferritic structure is 0.5-1.0%.
In step a, pearlite steel rail then by RH application of vacuum, is obtained through continuous casting by converter smelting, LF refining
Steel billet finally rolls steel billet and is obtained.Elevating steel raising and shifting machine includes at least three lift moving devices 1, pearlitic steel
Rail is placed on lift moving device 1, and the rail fastening 25 by lifting moving device 1 fastens.
In stepb, elevating steel raising and shifting machine at least three groups of lift moving devices 1, all lift moving devices 1 are arranged at intervals on pearly-lustre
On the conveying circuit of body rail, it is provided with a walking dolly 22 on each lift moving device 1, the pearlite steel rail after rolling is put
It sets on walking dolly 22, then is fastened by rail fastening 25, control the speed of service of 22 horizontal displacement of walking dolly, make to go
It walks and is run on the no longer same straight line of trolley 22, so that pearlite steel rail be made to realize the bending deformation of S type or circular arc in the horizontal plane
The bending deformation of pearlite steel rail is realized in bending deformation.In order to further increase the comprehensive performance of pearlite steel rail, in pearlite
In rail transmission process, by controlling the speed of service of 22 horizontal displacement of walking dolly, to being delivered to Heat treating machine set inlet
Pearlite steel rail temperature controlled, by largely practicing and test obtains, be just placed on pearly-lustre on elevating steel raising and shifting machine
The temperature of body rail is between 840-1000 DEG C, and the speed of service of the horizontal displacement of each trolley is between 0.01-3m/min, pearl
The cooling velocity of body of light rail is between 0.05-1.5 DEG C/s, to realize the pearlitic steel for being delivered to Heat treating machine set inlet
Rail temperature is between 760-900 DEG C.
In step e, using cooling device to the rail head tyre tread of pearlite steel rail, rail head two sides, rail head web of the rail junction
With the one of rail bottom center at perhaps many places apply accelerate cooling medium cooling medium be compressed air, water mist or compressed air
With the mixture of water mist, the cooling velocity of pearlite steel rail is between 1-5 DEG C/s.
To above-mentioned elevating steel raising and shifting machine, as shown in Figure 1 and Figure 2, including at least three groups of lift moving devices 1, all lifts move dress
It sets 1 to be arranged at intervals on the conveying circuit of pearlite steel rail, lift moving device 1 includes lifting body, transfer mechanism；
Lifting body includes that guide rail beam 11, the first elevating rocker arm 12, the second elevating rocker arm 13, hydraulic cylinder 14, first are solid
Determine pedestal 15, the second firm banking 16, first rotating shaft 17, the second shaft 18, rocker arm 19, the upper end of the first elevating rocker arm 12 with lead
The side of beam-and-rail 11 is articulated and connected, and the lower end of the first elevating rocker arm 12 is connected with first rotating shaft 17, the second elevating rocker arm 13
Upper end and the other side of guide rail beam 11 are articulated and connected, and the lower end of the second elevating rocker arm 13 is connected with the second shaft 18, guide rail beam
11, the parallelogram mechanism that the first elevating rocker arm 12, the second elevating rocker arm 13 are constituted, first rotating shaft 17 are rotatably arranged on first
On firm banking 15, the second shaft 18 is rotatably arranged on the second firm banking 16, one end and 17 phase of first rotating shaft of rocker arm 19
Connection, the other end of rocker arm 19 and the piston rod end of hydraulic cylinder 14 are articulated and connected, and the bottom of hydraulic cylinder 14 is solid with first
Determine the articulated connection of pedestal 15；
Transfer mechanism includes guide rail 21, walking dolly 22, motor 23, transmission chain 24, rail fastening 25, and guide rail 21 is arranged
On guide rail beam 11, the starting point of guide rail 21 is exactly that the pearlite steel rail after rolling is placed on elevating steel raising and shifting machine position, guide rail
21 terminal is exactly Heat treating machine set inlet, and the matching of walking dolly 22 is arranged on guide rail 21, and motor 23 is arranged in guide rail beam
11 side, transmission chain 24 can be such that walking dolly 22 moves back and forth along guide rail 21, rail fastening 25 under the effect of motor 23
It is hinged to be arranged on walking dolly 22.
The operation of walking dolly 22 is relatively independent, in use, it is small that the pearlite steel rail after rolling is placed on walking
On vehicle 22, then pass through rail fastening 25 and fasten, pass through the release and contraction of the piston rod of hydraulic cylinder 14, drives the first lifting
Rocker arm 12, rocker arm 19 are rotated around first rotating shaft 17, and the second elevating rocker arm 13 rotates around the second shaft 18, thus make guide rail beam 11,
Walking dolly 22 moves up and down, and pearlite steel rail is driven to move up and down, and walking dolly 22 realizes that edge is led in the positive and negative rotation of motor 23
Rail 21 moves back and forth, and pearlite steel rail is driven to be delivered to Heat treating machine set inlet.Meanwhile the fortune by controlling walking dolly 22
Scanning frequency degree runs walking dolly 22 on the same line, make pearlite steel rail realize in the horizontal plane the bending deformation of S type or
Person's circular arc bending deformation, realizes the bending deformation of pearlite steel rail.As it can be seen that the elevating steel raising and shifting machine structure is simple, movement can
It leans on, is easy to use.
Specifically, improving its intensity to improve the globality of entire elevating steel raising and shifting machine, connecting rod 10 is also set up,
First firm banking 15 of all lift moving devices 1 links together.
For the ease of using, automatization level is improved, programmable controller, the motor of all lift moving devices 1 are additionally provided with
23, hydraulic cylinder 14 is connected by signal data line with programmable controller.Motor 23, hydraulic cylinder 14 pass through programmable control
Device processed automatically controls.The start of a run of the walking dolly 22 of each lift moving device 1, stroke end go out to be provided with close to switch simultaneously
26, it is provided on walking dolly 22 close to inductive switching plate 27, passes through signal data line and programmable close to inductive switching plate 27
Controller is connected.
The pearlite steel rail being placed on walking dolly 22 in order to prevent deviates in conveying, and guide rail beam 11 is protected always
Water holding is flat.
By being obtained in largely practicing and testing, the pearlite steel rail produced using on-line processing method of the present invention, pearl
The mechanical property of body of light rail are as follows: tensile strength is greater than 1000MPa, and elongation percentage is greater than 10.5%, and average tyre tread hardness is greater than
351HB。
In conclusion elevating steel raising and shifting machine is to pearl during conveying pearlite steel rail by elevating steel raising and shifting machine
Body of light rail applies active force, makes pearlite steel rail when being delivered to Heat treating machine set inlet, pearlite steel rail is in horizontal plane
Upper realization S type bending deformation or circular arc bending deformation guarantee to reduce steel on the basis of pearlite steel rail mechanical property does not reduce
The internal residual stress of rail improves the comprehensive performance and service life of rail；When being heat-treated, and pass through cooling device pair
Cadion-acceleration cooling medium in pearlite steel rail application tyre tread center, rail head two sides and rail bottom, rail head and rail bottom temperature reduce rapidly,
Cause the heat at web of the rail position to conduct to both ends rapidly, so that pearlite steel rail is quickly cooled the temperature to 400-500 DEG C, can refine
Rail pearlite piece interlamellar spacing, further increases the intensity and toughness of rail；Simultaneously pearlite steel rail carry out heat treatment start
When, temperature controls between 760-900 DEG C, make pearlite steel rail to open cold temperature essentially identical, reduce between pearlite steel rail
Mechanical Fluctuation, improve the consistency of performance of pearlite steel rail, it is seen then that the present invention can be improved the synthesis of pearlite steel rail
Performance reduces the occurrence probability of pearlite steel rail rolling contact fatigue, improves the whole service life of rail, is conducive to promote.
Claims (9)
1. pearlite steel rail on-line processing method, which comprises the steps of:
A, the pearlite steel rail after rolling is placed on lifting between 840-1000 DEG C by the temperature of the pearlite steel rail after rolling
On steel raising and shifting machine, pearlite steel rail is conveyed by elevating steel raising and shifting machine；
B, in pearlite steel rail transmission process, elevating steel raising and shifting machine applies active force to pearlite steel rail, makes pearlitic steel
For rail when being delivered to Heat treating machine set inlet, pearlite steel rail realizes the bending deformation of S type or circular arc bending in the horizontal plane
Deformation；
C, pearlite steel rail is delivered to Heat treating machine set inlet；
D, pearlite steel rail is put into Heat treating machine set, and enters the pearlite steel rail temperature of Heat treating machine set in 760-
Between 900 DEG C；
E, cooling device is provided in Heat treating machine set, cooling device applies pearlite steel rail and accelerates cooling medium, makes pearly-lustre
Body rail temperature is down to 400-500 DEG C, and pearlite steel rail temperature stops applying after being down to 400-500 DEG C accelerates cooling medium, pearl
Body of light rail is cooled to room temperature by air.
2. pearlite steel rail on-line processing method as described in claim 1, it is characterised in that: in step e, filled using cooling
It sets at the one of the rail head tyre tread to pearlite steel rail, rail head two sides, rail head web of the rail junction and rail bottom center or many places applies
Accelerate cooling medium.
3. pearlite steel rail on-line processing method as described in claim 1, it is characterised in that: in step e, cooling device pair
When pearlite steel rail applies acceleration cooling medium, the cooling velocity of pearlite steel rail is between 1-5 DEG C/s.
4. pearlite steel rail on-line processing method as claimed in claim 3, it is characterised in that: cooling medium be compressed air,
The mixture of water mist or compressed air and water mist.
5. the pearlite steel rail on-line processing method as described in Claims 1-4 any one, it is characterised in that: lifting lift steel
Machine for moving steel includes at least three groups of lift moving devices (1), and all lifts moving device (1) are arranged at intervals on the conveying circuit of pearlite steel rail
On, lift moving device (1) includes lifting body, transfer mechanism；
Lifting body includes guide rail beam (11), the first elevating rocker arm (12), the second elevating rocker arm (13), hydraulic cylinder (14),
One firm banking (15), the second firm banking (16), first rotating shaft (17), the second shaft (18), rocker arm (19), the first lifting are shaken
The upper end of arm (12) and the side of guide rail beam (11) are articulated and connected, lower end and first rotating shaft (17) phase of the first elevating rocker arm (12)
Connection, the upper end of the second elevating rocker arm (13) and the other side of guide rail beam (11) are articulated and connected, under the second elevating rocker arm (13)
End is connected with the second shaft (18), and guide rail beam (11), the first elevating rocker arm (12), the second elevating rocker arm (13) constitute parallel
Quadrangular mechanism, first rotating shaft (17) are rotatably arranged on the first firm banking (15), and the second shaft (18) is rotatably arranged on
On two firm bankings (16), one end of rocker arm (19) is connected with first rotating shaft (17), the other end and hydraulic oil of rocker arm (19)
The piston rod end of cylinder (14) is articulated and connected, and the bottom and the first firm banking (15) of hydraulic cylinder (14) are articulated and connected；
Transfer mechanism includes guide rail (21), walking dolly (22), motor (23), transmission chain (24), rail fastening (25), guide rail
(21) it is arranged on guide rail beam (11), walking dolly (22) matching is arranged on guide rail (21), and motor (23) is arranged in guide rail beam
(11) side under transmission chain (24) is acted in motor (23), can be such that walking dolly (22) moves back and forth along guide rail (21), steel
Rail fixing piece (25) is hingedly arranged on walking dolly (22).
6. pearlite steel rail on-line processing method as claimed in claim 5, it is characterised in that: further include connecting rod (10), institute
There is the first firm banking (15) of lift moving device (1) to link together.
7. pearlite steel rail on-line processing method as claimed in claim 5, it is characterised in that: it further include programmable controller,
Motor (23), the hydraulic cylinder (14) of all lifts moving device (1) are connected by signal data line with programmable controller.
8. pearlite steel rail on-line processing method as claimed in claim 7, it is characterised in that: the row of each lift moving device (1)
Walk the starts of a run of trolley (22), stroke end goes out to be provided with close to switch (26), be provided on walking dolly (22) close to opening
It closes tablet (27), is connected close to inductive switching plate (27) by signal data line with programmable controller.
9. pearlite steel rail on-line processing method as claimed in claim 5, it is characterised in that: guide rail beam (11) remains water
It is flat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811458189.3A CN109371219B (en) | 2018-11-30 | 2018-11-30 | Pearlite steel rail on-line treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811458189.3A CN109371219B (en) | 2018-11-30 | 2018-11-30 | Pearlite steel rail on-line treatment method |
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| Publication Number | Publication Date |
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| CN109371219A true CN109371219A (en) | 2019-02-22 |
| CN109371219B CN109371219B (en) | 2021-01-26 |
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ID=65376321
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811458189.3A Active CN109371219B (en) | 2018-11-30 | 2018-11-30 | Pearlite steel rail on-line treatment method |
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| CN (1) | CN109371219B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111349862A (en) * | 2020-04-13 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel rail for high-speed railway and preparation method thereof |
| WO2021057094A1 (en) * | 2019-09-27 | 2021-04-01 | 武汉钢铁有限公司 | Production method that reduces residual stress of heat-treated steel rail and resulting steel rail |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021057094A1 (en) * | 2019-09-27 | 2021-04-01 | 武汉钢铁有限公司 | Production method that reduces residual stress of heat-treated steel rail and resulting steel rail |
| CN111349862A (en) * | 2020-04-13 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel rail for high-speed railway and preparation method thereof |
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|---|---|
| CN109371219B (en) | 2021-01-26 |
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