CN1102216A - Heat-treatment method of point tongue - Google Patents
Heat-treatment method of point tongue Download PDFInfo
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- CN1102216A CN1102216A CN 93118783 CN93118783A CN1102216A CN 1102216 A CN1102216 A CN 1102216A CN 93118783 CN93118783 CN 93118783 CN 93118783 A CN93118783 A CN 93118783A CN 1102216 A CN1102216 A CN 1102216A
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Abstract
The present invention belongs to a thermal treatment technique of steel rail, in particular it relates to a thermal treatment method of high-strength switch tongue. Its steps are as follows: firstly, the switch tongue is heated to quenching temp. by using intermediate-frequency induction heating equipment, and then the water-cooling, compressed air cooling or full compressed air cooling is selected, and finally the secondary spray quenching is used. The use of said method to make thermal treatment features stable technological process, simple and convenient operation, small deformation and good quality. Said invention can be used for thermal treatment of switch tongues with various models and qualities, and steel rail with specific tapered section.
Description
The invention belongs to the rail heat treatment technics, relate in particular to the poor tongue heat treatment technics in road with Frequency Induction Heating.
Along with the fast development of transportation by railroad cause, rail need adapt to the service requirements of high speed, heavy duty and large conveying quantity.Therefore, both at home and abroad the rail heat treatment technics is developed, produced and have all kinds of rail of high strength, to satisfy the needs of transportation by railroad, correspondingly, the special rail of tongue that railway switch is used and so on has also proposed high tough performance requriements.
Point tongue changes because of its rail head cross-section, and this will bring big difficulty to thermal treatment.In the prior art, heat treating method commonly used is: the rail head with the Frequency Induction Heating point tongue arrives quenching temperature earlier, and water and compressed-air actuated mixture carry out spray cooling (being called for short the mist quenching technology) then.There is following deficiency in this technology: 1. mist is the mixture of water and air, is subject to the influence of air pressure and discharge fluctuation, and both at home and abroad long-term practice proves, the existing instability phenomenon of " breathing " is difficult to overcome all the time during spray cooling.Above-mentioned reason will influence the stability and the product performance of quenching technology; 2. spray cooling is comparatively difficult to the controlled chilling scope, especially more need change its cooling range and position to special rail, to adapt to the variation of its rail head cross-section; 3. spray to controlled chilling speed underaction, and stop also having hysteresis phenomenon after the cooling, be unfavorable for control and directly influence product performance.Also have and adopt single medium pressurized air to spray air cooling (be called for short wind quench technology), but less, can not adapt to the quench cooled of rail head cross-section when big, cause depth of hardening shallow partially because of the speed of cooling of spray wind.Simultaneously, because the pressurized air consumption is excessive, with corresponding increase investment and cost.
The objective of the invention is: 1. adopt stable single medium, can overcome " breathing " phenomenon and the hysteresis phenomenon of spraying; 2. adopt being used of multiple single medium,, improve the quality of products to adapt to the variation of section; 3. reduce the pressurized air consumption, reduce product cost.
The heat treating method of the special rail of production high strength provided by the present invention, the steps include: earlier point tongue to be heated to predetermined thermal treatment temp with intermediate frequency induction heating device to its rail head, it generally is 800～1020 ℃, air cooling is to preset temperature then, it generally is 700～820 ℃, so that the rail's end portion temperature is even, and helps suitably deepening hardened layer and reduce the heat-eliminating medium consumption.Subsequently,, 10～45 ℃ warm water are sprayed to rail head, make its speed of cooling be cooled to 650～500 ℃ with 4.5～17.5 ℃/S with being configured in rail's end portion equipment water jetting cooler on every side.Then, with being configured in around the rail's end portion and only pressurized air being sprayed to rail's end portion at two groups of air-jet devices of rail head tread, make its speed of cooling be cooled to 550～300 ℃ with 0.5～12.5 ℃/S, thereby guarantee that the rail's end portion surface obtains the nodular troostite tissue that hardness evenly descends inwards to 10～20mm scope, its Vickers' hardness is 400～306(Brinell hardness 390～300HB).Determining of the rail head temperature of spray after the air cooling not only will be considered the metallographic structure that obtained also will make the certain temperature head of maintenance between the rail head and the flange of rail, to control its thermal bending deformation amount.Subsequently, replenish the cooling rail head with the secondary waterworks again, make its temperature reduce to 350～100 ℃, last air cooling is to room temperature.
In whole heat treatment process, point tongue is with respect to the unidirectional movement continuously of thermal treatment unit, and its speed can reach 0.4～1.2m/min.
Above technology abbreviates " first water after wind " quenching technology as.It is suitable for the bigger position of rail head cross-section.When rail head cross-section hour, then adopt " full blast quenching " technology.Promptly close waterworks and close the air-jet device of rail head both sides and open the one dimension air-jet device, only spray air cooling rail head top.
Adopt the present invention can reach following effect:
1. since of the present invention be wind process behind the first water, all are single media, the operator is easy to control and regulates.Therefore technology stability is good, can guarantee the quality of quenching.
2. along with the variation of rail head cross-section, quenching technology also changes thereupon, and organic cooperation of two kinds of technologies improves thermal treatment quality.
3. can adjust cooling range and regulate speed of cooling, so compressed air consumption can save 30～55% by the variation of rail head cross-section.
The present invention can be used for the thermal treatment of point tongue and other special change section rail of various models, material.
The invention will be further described below in conjunction with accompanying drawing.
The example side-view of Fig. 1 the method for the invention
The three-dimensional air-jet device of Fig. 2 sprays cold figure when 35mm (rail head width 〉=)
During Fig. 3 rail head width＜35mm, the behaviour in service of three-dimensional air-jet device
Fig. 4 one dimension air-jet device installation plan
Hardness Distribution curve on the cross section after the thermal treatment of Fig. 5 point tongue
Brinell hardness number on the cross section after the thermal treatment of Fig. 6 60AT tongue.
Fig. 1 is embodiments of the invention.Quenching machine is sent into point tongue 1 continuous uniaxially in the thermal treatment unit with the speed of 0.4～1.2m/min and is heat-treated.Heating unit 2 is a medium frequency induction heater, and it only covers on the tongue head, utilizes the induced current that is produced that rail head is heated to 800～1020 ℃.Equipment water jetting cooler 3 is configured in around the tongue head.Air-jet device 4 is configured in around the rail head, is three-dimensional air-jet device (see figure 2); Air-jet device 5 is configured in the rail head tread, is one dimension air-jet device (see figure 4), is used for rail head cross-section hour.Secondary equipment water jetting cooler 6 is used for replenishing the cooling rail head, to reduce the temperature difference between the rail head and the flange of rail, reaches the purpose of control tongue heat distortion amount.
Embodiment
Its chemical ingredients of 60AT tongue is: 0.74%C, and 0.26%Sl, 1.24%Mn, 0.018%S, 0.027%S, all the other are iron and trace element.Tongue carries out the thermal treatment of following condition with the present invention under the handover speed of 0.62～0.78m/min: earlier with intermediate frequency induction heating device heating rail head tread to 880 ℃, and air cooling to 750 ℃ subsequently; Carry out quench cooled then, cooling conditions is respectively: when rail head width 〉=35mm, waterworks sprays to the tongue head with 15 ℃ of water, makes its speed of cooling with 11.2 ℃/S reduce to 582 ℃; Air-jet device sprays to rail head with pressurized air, makes its speed of cooling with 3.4 ℃/S be cooled to 378 ℃; The about 2min of air cooling replenishes the cooling rail head with the secondary waterworks at last again, makes it reduce to 210 ℃.When rail head width＜35mm, air-jet device compressed air spraying rail head makes it with 4.5 ℃/S(leading portion) speed of cooling be cooled to 543 ℃, again with 7.6 ℃/S(back segment) speed of cooling be cooled to 315 ℃, the about 1.5min of air cooling replenishes with the secondary waterworks at last and is cooled to 180 ℃.The mechanical property of tongue after by this method thermal treatment is: σ b=1281.2MPa, σ
0.2=865.9MPa, δ
5=14.3%, case depth 〉=12mm, each point Brinell hardness calibration is seen Fig. 6 on the rail head cross section.On the 11.3m tongue, deflection along its length is 42mm.
Claims (4)
1, a kind of heat treating method of production high strength point tongue is characterized in that:
1. point tongue is heated to 800～1020 ℃ with intermediate frequency induction heating device;
2. air cooling to 700～820 ℃;
3. with waterworks 10～45 ℃ water is sprayed to rail head, make its speed of cooling be chilled to 650～500 ℃ with 4.5～17.5 ℃/S;
4. with air-jet device pressurized air is sprayed to rail head, make its speed of cooling reduce to 550～300 ℃ with 0.5～12.5 ℃/S.
2, heat treating method according to claim 1 is characterized in that: when rail head width during less than 35mm, then third and fourth step of above-mentioned steps substitutes with full spray wind, and only to the spray air cooling of rail head top.
3, heat treating method according to claim 1 and 2 is characterized in that: after the spray air cooling, require to keep between the rail head and the flange of rail certain temperature head.Then, replenish the cooling rail head with the secondary waterworks again, make its temperature reduce to 350～100 ℃.
4, heat treating method according to claim 1 and 2, to chemical ingredients is 0.74%C, 0.26%Sl, 1.24%Mn, 0.018%P, the 60AT tongue of 0.027%S, under the handover speed of 0.62～0.78m/min, its thermal treatment process is: Heating temperature is 880 ℃, air cooling to 750 ℃ subsequently, when rail head width 〉=35mm: the water spray cooling makes the rail head temperature reduce to 582 ℃ with the speed of cooling of 11.2 ℃/S, again with the pressurized air cooling, with the speed of cooling of 3.4 ℃/S, make it reduce to 378 ℃, the about 2min of air cooling, water spray cooling again makes it reduce to 210 ℃ at last.
When rail head width＜35mm, behind the air cooling to 750 ℃, promptly cool off with pressurized air, in 750～543 ℃ of scopes, speed of cooling is 4.5 ℃/S, in 542～315 ℃ of scopes, speed of cooling is 7.6 ℃/S, and the about 1.5min of air cooling sprays water at last and is cooled to 180 ℃ then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93118783 CN1040028C (en) | 1993-10-26 | 1993-10-26 | Heat treatment method for switch tongue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93118783 CN1040028C (en) | 1993-10-26 | 1993-10-26 | Heat treatment method for switch tongue |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1102216A true CN1102216A (en) | 1995-05-03 |
| CN1040028C CN1040028C (en) | 1998-09-30 |
Family
ID=4992643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93118783 Expired - Lifetime CN1040028C (en) | 1993-10-26 | 1993-10-26 | Heat treatment method for switch tongue |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1040028C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1042241C (en) * | 1995-08-04 | 1999-02-24 | 铁道部宝鸡桥梁工厂 | Method and equipment for quenching switch blade from 5 mm part of railway |
| CN101245577B (en) * | 2008-03-07 | 2010-06-16 | 中铁宝桥股份有限公司 | Method for improving abrasion resistance of switch tongues point rail terminal |
| CN103276187A (en) * | 2013-06-08 | 2013-09-04 | 武汉钢铁(集团)公司 | Process for improving comprehensive mechanical performances of weld of high-frequency straight welded tube |
| CN104060075A (en) * | 2014-07-14 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Heat treatment method of improving depth of hardened layer of steel rail |
| WO2020057538A1 (en) * | 2018-09-19 | 2020-03-26 | 武汉钢铁有限公司 | Steel rail inline heat treatment flatness control method |
| CN113817970A (en) * | 2021-08-31 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | High-strength high-toughness 60AT1 bainite switch rail and heat treatment process thereof |
| CN113977211A (en) * | 2021-10-28 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Medium-strength steel rail and production method thereof |
| CN114164337A (en) * | 2021-12-03 | 2022-03-11 | 芜湖中铁科吉富轨道有限公司 | Quenching process of I-shaped ultra-light switch rail with reversible deformation effect |
| CN115156852A (en) * | 2022-07-20 | 2022-10-11 | 中铁宝桥集团有限公司 | Processing and manufacturing method of climbing switch rail |
-
1993
- 1993-10-26 CN CN 93118783 patent/CN1040028C/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1042241C (en) * | 1995-08-04 | 1999-02-24 | 铁道部宝鸡桥梁工厂 | Method and equipment for quenching switch blade from 5 mm part of railway |
| CN101245577B (en) * | 2008-03-07 | 2010-06-16 | 中铁宝桥股份有限公司 | Method for improving abrasion resistance of switch tongues point rail terminal |
| CN103276187A (en) * | 2013-06-08 | 2013-09-04 | 武汉钢铁(集团)公司 | Process for improving comprehensive mechanical performances of weld of high-frequency straight welded tube |
| CN104060075A (en) * | 2014-07-14 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Heat treatment method of improving depth of hardened layer of steel rail |
| CN104060075B (en) * | 2014-07-14 | 2016-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Improve the heat treatment method of rail hardening layer depth |
| WO2020057538A1 (en) * | 2018-09-19 | 2020-03-26 | 武汉钢铁有限公司 | Steel rail inline heat treatment flatness control method |
| CN113817970A (en) * | 2021-08-31 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | High-strength high-toughness 60AT1 bainite switch rail and heat treatment process thereof |
| CN113977211A (en) * | 2021-10-28 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Medium-strength steel rail and production method thereof |
| CN114164337A (en) * | 2021-12-03 | 2022-03-11 | 芜湖中铁科吉富轨道有限公司 | Quenching process of I-shaped ultra-light switch rail with reversible deformation effect |
| CN114164337B (en) * | 2021-12-03 | 2023-04-14 | 芜湖中铁科吉富轨道有限公司 | Quenching process of I-shaped ultra-light switch rail with reversible deformation effect |
| CN115156852A (en) * | 2022-07-20 | 2022-10-11 | 中铁宝桥集团有限公司 | Processing and manufacturing method of climbing switch rail |
| CN115156852B (en) * | 2022-07-20 | 2024-05-03 | 中铁宝桥集团有限公司 | Climbing type switch rail processing and manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1040028C (en) | 1998-09-30 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHONGYE SAIDI ENGINEERING TECHNOLOGY CO., LTD. Free format text: FORMER NAME OR ADDRESS: CHONGQING IRON AND STEEL DESIGN INST., MINISTRY OF METALLURGICAL INDUSTRY |
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| CP03 | Change of name, title or address |
Address after: 400013 No. 1, Shuang Steel Road, Shizhong District, Chongqing Patentee after: Zhongye Saide Engineering Technology Co., Ltd. Address before: 630013, No. 1, Shuang Steel Road, Shizhong District, Sichuan, Chongqing Patentee before: Chongqing Iron and Steel Design Inst., Min MI |
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| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20131026 Granted publication date: 19980930 |