CN110093481A - A kind of track process for quenching based on induction heating - Google Patents
A kind of track process for quenching based on induction heating Download PDFInfo
- Publication number
- CN110093481A CN110093481A CN201910440761.1A CN201910440761A CN110093481A CN 110093481 A CN110093481 A CN 110093481A CN 201910440761 A CN201910440761 A CN 201910440761A CN 110093481 A CN110093481 A CN 110093481A
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- China
- Prior art keywords
- rail
- heating
- quenching
- track
- induction
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Classifications
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- 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 relates to a kind of, and the track process for quenching based on induction heating is kept the temperature after being heated to 840-880 DEG C comprising steps of 1) outer surface of track to be accessed to the alternating current of intermediate frequency 1.0-4.0kHz by inductor；2) after the completion of step 1), rail is sent into the burning optimization on line device for being equipped with quenching liquid and carries out quenching, and the induction coil of inductor is placed in the outlet port of online annealing device, continuous heating is carried out to the web of the rail position of rail, heating and temperature control is at 500-540 DEG C, heating time is 40 seconds, rate of heat addition 1m/s；3) after the completion of heating, by rail cooled to room temperature.Compared with prior art, the present invention can avoid the generation of abnormal martensitic structure, substantially reduces track and carries out stress existing for quenched rear inside, and simple possible of the present invention, is suitable for industrialized production.
Description
Technical field
The present invention relates to track welding and electromagnetic induction heating technology field, more particularly, to a kind of based on induction heating
Track process for quenching.
Background technique
The rapid pace of China Today high-speed rail development enables the world unmatch, and the promotion of high-speed rail speed also be unable to do without railway
Orbit construction, with the development of railway transportation cause, high-speed rail trailing weight, traffic density and year are stepped up by total amount, are made
It obtains the load that track is born to greatly increase, in order to improve the service life of track, intensity, the hardness of rail be proposed new
It is required that.The practice of countries in the world railway is it has been proved that heat-treatment of rail is the most effective, most economical of raising steel rail material obdurability
Measure.However, how to provide a kind of hardness for capableing of reinforcing rail surface, tensile strength, elongation percentage heat treatment method still
It is so the major issue for needing to solve.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind to be based on induction heating
Track process for quenching.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of track process for quenching based on induction heating, method includes the following steps:
S1: by the outer surface of rail by the alternating current of inductor access intermediate frequency 1.0-4.0kHz, made using induction heating
Track is heated to 840-880 DEG C, is kept the temperature after heating.
Preferably, the power frequency that inductor is specifically passed through is 2.5kHz.It is non-closed circle that inductor, which uses,
Induction coil.
Preferably, the shape of non-closed round induction coil is two semicircles, connects two semicirculars
Junction is equipped with the fixed device of detachable insulating.The fixed device of detachable insulating includes insulating trip, to clamp two and half
The fixation device of circular coil and the clamping device that semicircular can be clamped.Insulating trip is placed in the middle position of fixed device
Place, clamping device are connect with fixed device, and clamping device is clamped in the junction edge of two semicirculars.
S2: after to step S1, rail merging is equipped in the burning optimization on line device of quenching liquid, and to web of the rail position
Continuous heating is carried out, passes through the excessive temperature loss of compensation track in During Quenching, web of the rail position is heated, keep track vertical
To the being consistent property of temperature in direction.The temperature control of compensation heating is at 500-540 DEG C, and heating time is 40 seconds, the rate of heat addition
For 1m/s, the temperature of the web of the rail is controlled for avoiding the web of the rail and upper and lower trigonum from generating abnormal structure, and coordinates rail head and rail
Thermal stress between bottom reduces track interior stress, track is avoided to crack.
In the heat treatment of rail, the coil of inductor is located at the exit site of burning optimization on line device, is added by induction
Hot orbit waist extends rail in the residence time in perlitic transformation area, the generation of abnormal martensitic structure is avoided, to eliminate
The abnormal structure of the web of the rail and upper and lower trigonum, while reducing rail internal stress.After carrying out a whole set of quenching process, substantially reduce
The residual stress of track improves track safety in use.
S3: after the completion of heating, by rail cooled to room temperature.
Compared with prior art, the invention has the following advantages that
One, induction heating technique is applied in track quenching process by the present invention, and persistently to the web of the rail in During Quenching
It is heated to inhibit the degree of supercooling after track heat treatment, extends rail in the residence time in perlitic transformation area, keep rail fast
Fast austenitizing, the moment of austenite structure transformation, the available higher crystal grain of rank quenches to rail using quenching liquid
It is cold, cooling velocity is controlled, makes in cooling procedure that spacing is reduced 100nm or less between the pearlite of shred layer and distribution is equal
It is even, the generation of abnormal martensitic structure is avoided, the hardness, tensile strength, elongation percentage of Rail Surface is made all to be greatly improved；
Two, the present invention extends rail in the residence time in perlitic transformation area, to disappear by induction heating track waist
Except the web of the rail and the abnormal structure of upper and lower trigonum, while reducing rail internal stress, after carrying out a whole set of quenching process, drops significantly
The low residual stress of track can reduce the residual stress of 60-140MPa, improve track safety in use.
Detailed description of the invention
Fig. 1 is the schematic cross-section of non-closed coil in the present invention；
Fig. 2 is to use the quenched rail tissue micrograph of the method for the present invention in the present invention in embodiment 1；
Fig. 3 is to carry out temperature controlled quenched rail to the web of the rail not in During Quenching in embodiment 1 in the present invention
Organize micrograph；
Fig. 4 is to use the quenched rail tissue micrograph of the method for the present invention in the present invention in embodiment 2；
Fig. 5 is to carry out temperature controlled quenched rail to the web of the rail not in During Quenching in embodiment 2 in the present invention
Organize micrograph；
Fig. 6 is the flow diagram of the method for the present invention.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.Obviously, described embodiment is this
A part of the embodiment of invention, rather than whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, all should belong to the scope of protection of the invention.
Embodiment 1
The present invention relates to a kind of track process for quenching based on induction heating, this method include the following steps:
Step 1: the outer surface of track is heated to 840- by the alternating current of inductor access intermediate frequency 1.0-4.0kHz
It 880 DEG C, is kept the temperature after heating.The power frequency that inductor is specifically passed through is 2.5kHz.Inductor uses non-closed circle
Shape induction coil.As shown in Figure 1, the shape of non-closed round induction coil is two semicircles, two semicircles are connected
The position of coil is equipped with the fixed device of detachable insulating.The fixed device of detachable insulating includes insulating trip, to two semicircles
The fixation device that shape coil is fixed such as more commonly used coil fixing device and can clamp the folder of coil in the prior art
Tight device, such as coil binding clasp.Insulating trip is placed in the middle position of fixed device, and clamping device is connect with fixed device,
Clamping device is clamped in the junction edge of two semicirculars.
Step 2: rail is sent into the burning optimization on line device equipped with quenching liquid and carries out quenching, online after heating
Annealing device includes rack and the coil that is fixed on the rack；The induction coil of inductor is placed in going out for online annealing device
Mouth position carries out continuous heating to web of the rail position, and for heating and temperature control at 500-540 DEG C, heating time is 40 seconds, heating speed
Rate is 1m/s；Wherein, it is located at exit site in track heat treatment coil, by induction heating track waist, extends rail and exist
The residence time in perlitic transformation area.
Step 3: by rail cooled to room temperature after heating.
The present embodiment has carried out two groups of experiments, and A group uses track process for quenching of the invention, includes to main chemical compositions
Other microalloy elements such as 0.49-0.89%C, 0.45-0.75%Si, 0.84-1.58%Mn, 0.25-1.10%Cr and impurity
Rail be quenched.
Concrete operations are as follows: the outer surface of track is heated to 855 DEG C by the alternating current of inductor access intermediate frequency 2.5kHz.
Rail is sent into the burning optimization on line device equipped with quenching liquid, and continuous heating is carried out to web of the rail position, and implement temperature control
System, 520 DEG C of heating temperature, heating time is 40 seconds, rate of heat addition 1m/s.Temperature control data is as shown in table 1, Quench heating
Rail Surface tissue afterwards is as shown in Figure 2.
1 embodiment 1A group track heating and temperature control data of table
The experiment of B group uses identical quenching technical, but does not carry out temperature control, Quench heating to the web of the rail in During Quenching
Rail Surface tissue afterwards is as shown in Figure 3.According to fig. 2, Fig. 3 in the macrograph of B group compared to A group it is found that have significantly
Abnormal martensitic structure.
Embodiment 2
The non-closed round induction coil and embodiment 1 that track used in the present embodiment quenches process, uses
In it is identical, heating temperature, time are different in quenching process.Concrete operations are as follows:
The present embodiment has carried out two groups of experiments, and C group uses track process for quenching of the invention, includes to main chemical compositions
Other microalloy elements such as 0.49-0.89%C, 0.45-0.75%Si, 0.84-1.58%Mn, 0.25-1.10%Cr and impurity
Rail be quenched.
The outer surface of track is heated to 855 DEG C by the alternating current of inductor access intermediate frequency 2.5kHz.Rail is sent into
In burning optimization on line device equipped with quenching liquid, and to web of the rail position carry out continuous heating, 500 DEG C of heating temperature, heating time
It is 30 seconds, rate of heat addition 0.5m/s.Temperature control data is as shown in table 2, Rail Surface tissue such as Fig. 4 institute after Quench heating
Show.
2 embodiment 2C group track heating and temperature control data of table
The experiment of D group does not carry out temperature control to the web of the rail using the identical quenching technical with C group, but in During Quenching, quenches
Rail Surface tissue after fire heating is as shown in Figure 5.According to Fig. 4, Fig. 5 it is found that having in the macrograph of D group compared to C group
Apparent exception martensitic structure.
In conclusion induction heating technique is in being applied to the quenching of rail height by the present invention, and compensate at the web of the rail plus
Heat come inhibit track be heat-treated after degree of supercooling, extend rail in the residence time in perlitic transformation area, avoid abnormal martensite
The generation of tissue.Web of the rail computer heating control can coordinate the temperature difference between rail head and rail bottom, to reduce inside rails
Stress reduces the risk that there is cracking in rail use, is conducive to the stability and service life that improve track quality.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
The staff for being familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (5)
1. a kind of track process for quenching based on induction heating, which is characterized in that this method comprises the following steps:
1) by the outer surface of track by inductor access intermediate frequency 1.0-4.0kHz alternating current, be heated to 840-880 DEG C it is laggard
Row heat preservation；
2) after the completion of step 1), rail is sent into the burning optimization on line device for being equipped with quenching liquid and carries out quenching processing, wherein sense
The induction coil of device is answered to be placed in the outlet port of online annealing device, and using burning optimization on line device to the web of the rail position of rail
Carry out continuous heating is set, heating and temperature control is at 500-540 DEG C, and heating time is 40 seconds, rate of heat addition 1m/s；
3) after the completion of heating, by rail cooled to room temperature.
2. a kind of track process for quenching based on induction heating according to claim 1, which is characterized in that the induction
The AC current frequency of device access is 2.5kHz.
3. a kind of track process for quenching based on induction heating according to claim 2, which is characterized in that the induction
Device uses non-closed round induction coil.
4. a kind of track process for quenching based on induction heating according to claim 3, which is characterized in that described non-to close
Box-like round induction coil includes the semicircular of two connections symmetrical above and below, and the junction of two semicirculars is equipped with
Detachable insulating fixes device.
5. a kind of track process for quenching based on induction heating according to claim 4, which is characterized in that described is removable
The formula insulating fixing device of unloading includes insulating trip, to fix the fixation device of two semicirculars and to clamp two semicircles
The clamping device of shape coil, the insulating trip are placed in the middle position of fixed device, the clamping device and fixed dress
Connection is set, the clamping device is clamped in the junction edge of two semicirculars.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910440761.1A CN110093481A (en) | 2019-05-24 | 2019-05-24 | A kind of track process for quenching based on induction heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910440761.1A CN110093481A (en) | 2019-05-24 | 2019-05-24 | A kind of track process for quenching based on induction heating |
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| Publication Number | Publication Date |
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| CN110093481A true CN110093481A (en) | 2019-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910440761.1A Pending CN110093481A (en) | 2019-05-24 | 2019-05-24 | A kind of track process for quenching based on induction heating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110682066A (en) * | 2019-11-07 | 2020-01-14 | 云南太标数控机床有限公司 | Pre-deformation quenching processing method for hard rail surface of machine tool |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101701284A (en) * | 2009-12-11 | 2010-05-05 | 吴良坤 | Heat treatment method for steel rail |
| CN101792991A (en) * | 2010-03-09 | 2010-08-04 | 武汉利德测控技术股份有限公司 | Synthetic magnetic field type on-line steel rail welding seam normalizing treatment method and normalizing middle-frequency inductor |
| US20170283903A1 (en) * | 2014-10-15 | 2017-10-05 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process |
| CN107988464A (en) * | 2017-12-22 | 2018-05-04 | 包头钢铁（集团）有限责任公司 | A kind of online sensing heating control method of rail |
| CN109593941A (en) * | 2019-01-14 | 2019-04-09 | 上海工程技术大学 | A kind of rail induction normalizing method |
-
2019
- 2019-05-24 CN CN201910440761.1A patent/CN110093481A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101701284A (en) * | 2009-12-11 | 2010-05-05 | 吴良坤 | Heat treatment method for steel rail |
| CN101792991A (en) * | 2010-03-09 | 2010-08-04 | 武汉利德测控技术股份有限公司 | Synthetic magnetic field type on-line steel rail welding seam normalizing treatment method and normalizing middle-frequency inductor |
| US20170283903A1 (en) * | 2014-10-15 | 2017-10-05 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process |
| CN107988464A (en) * | 2017-12-22 | 2018-05-04 | 包头钢铁（集团）有限责任公司 | A kind of online sensing heating control method of rail |
| CN109593941A (en) * | 2019-01-14 | 2019-04-09 | 上海工程技术大学 | A kind of rail induction normalizing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110682066A (en) * | 2019-11-07 | 2020-01-14 | 云南太标数控机床有限公司 | Pre-deformation quenching processing method for hard rail surface of machine tool |
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Application publication date: 20190806 |