CN100503842C - Laser hardening hardening technique for railway high speed heavy rail - Google Patents
Laser hardening hardening technique for railway high speed heavy rail Download PDFInfo
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- CN100503842C CN100503842C CNB2007100124803A CN200710012480A CN100503842C CN 100503842 C CN100503842 C CN 100503842C CN B2007100124803 A CNB2007100124803 A CN B2007100124803A CN 200710012480 A CN200710012480 A CN 200710012480A CN 100503842 C CN100503842 C CN 100503842C
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Abstract
The invention relates to a railway high-speed heavy rail laser quenching hardening process, which comprises that: first, gasoline or alcohol decontamination solvents are used to remove the oil and rust on a steel rail surface, and the sand paper polishing on steel surface is carried out in order to evenly spray an absorbing light coating; second, an absorbing light coating SiO2 mixed with a bonding agent is uniformly coated on the steel surface with a spray gun or a brush , in order to increase the absorption rate of metal surface to CO2 Laser. The proportion between the coating and adhesivs is of 80g to 100g of SiO2 and 500ml to 600ml of alcohol and 15 ml of paint flakes. The pre-coated thickness is of 0.02mm to 0.05 mm; third, an integral-round spot is changed to a rectangular spot through a broadband integral mirror technology, and the bandwidth sizes for length and width are of 30 mm is multiplied by 1mm; fourth, a DL-HL-10000 type CO2 laser is used to fast scan the steel rail surface to realize rapid heating and cooling on the surface of the steel rail. By adoption the laser quenching strength method, the invention is capable of replacing the high-alloy material with the common railway steel rail material, thereby reducing the steel rail cost; the invention is capable of repairing the failure rail, thus reducing the material waste, and bringing greater economic benefits.
Description
Technical field
The invention belongs to the laser quenching technical field, particularly laser hardening ossifying technique of railway high speed heavy rail.
Background technology
Railway is the important traffic facilities that are related to national economy, and rail is the important component part of railroad track, directly bear train load and guide the wheel operation, so the quality of rail is very important.In train driving, the medial surface of rail is owing to be subjected to the bump of wheel and the dual function of friction, and its wearing and tearing are quite serious, and particularly sharp radius curve silent partners side grinding is particularly important.Along with the increase of heavily loaded traction requirements on the railway, the wear problem between wheel and the rail is more serious.Every year, the quantity because of the track that wear damage must be changed was sizable.Therefore, improve the wear resistance of rail, prolong the work-ing life and the replacement cycle of rail, thereby can reach the purpose of saving resource, reducing cost, increasing economic efficiency.
At present, the method for strengthening rail in the world mainly contains two kinds: the one, and alloy strengthening, the 2nd, heat treatment reinforcement.China railways is basic U71Mn and the U74 rail of using before the eighties in 20th century.For solving the short problem of these two kinds of rail lifes, railway, Ministry of Metallurgical Industry's door have been developed jointly PD2, PD3 and rare earth rail by the method for alloy strengthening.Present most of producer all adopts the medium frequency induction hardening technology of China Academy of Railways Sciences late 1990s exploitation that steel rider is carried out intensive treatment.U.S. Argonne institute of country has released the technology that reduces the iron surface friction with laser, and this technology is applied to rail, can reduce the friction of rail and wheel.Domestic also have many scholars that rail has been carried out circular light spot laser quenching processing experiment, but do not see the report of practical application.
Summary of the invention
The purpose of this invention is to provide laser hardening ossifying technique of railway high speed heavy rail.
Its specific embodiment is as follows:
(1) with gasoline or alcohol deoil, decontamination removal of solvents rail surface and oil contaminant and rust, further remove dirt with sand papering rail surface then, so that evenly spray light-absorbing coating.
(2) SiO that will mix with caking agent with spray gun or brush
2Extinction coating is coated in the rail surface equably, to improve the metallic surface to CO
2The specific absorption of laser, the proportioning of coating and caking agent is: 80～100gSiO
2+ 500～600ml alcohol+15ml coating agent which has to be dissolved in alcohol before use, precoating thickness are 0.02～0.05mm.
(3) air-dry coat.
(4) with DL-HL-10000 type CO
2The laser apparatus rapid scanning scribbles the rail surface of light-absorbing coating, makes the rail surface realize rapid heating and cooling.
Concrete processing parameter is as follows:
Laser power is 1.5～10kW
With broadband integral mirror technology circular light spot is transformed into rectangular light spot, its bandwidth sizes is length * wide=30mm * 1mm
Lap width is 0.5～1mm
Scan velocity V=200～1000mm/min
The invention reside in and utilize high power CO
2Laser apparatus is realized the excellent metallurgical combination of hard aurification layer and rail matrix by choosing suitable laser quenching hardening process parameter.The laser quenching technology is that laser beam irradiation after utilize focusing on is to the surface of ferrous materials, its temperature is elevated to more than the transformation temperature, rapidly after laser is removed, owing to still be in the quick conductive force of cryogenic inner layer material, the top layer is cooled fast to below the martensitic phase height, obtains quench-hardened case.Thereby increase the work-ing life of workpiece and reduce spillage of material.Its advantage with respect to medium frequency induction hardening is that rate of heating is fast, quenching hardness is high, workpiece deformation is little, the quenching position is controlled, do not need quenchant, productivity height, non-oxidation, pollution-free.
Quench-hardened case is organized as high carbon martensite, thin brilliant martensite and a small amount of austenite of mixing.Laser quenching causes structure refinement, and forms a large amount of high carbon martensites, thereby improves hardness, effectively suppresses the quick wearing and tearing on top layer.The present invention is owing to adopt the broad band light beam pattern not only can increase the width that hardens and be with, and the quick local swing of laser beam spot can make the vertex of hardened layer surface temperature change fast, the thermograde that causes closing the hardened zone middle section descends, and hardened layer tissue and performance are well improved.After with this method the 70MnV rail being carried out the laser quenching hardening treatment, can obtain thickness is 0.5～1mm, and hardness is the hardened layer of 800～1100HV.
The method of utilizing laser quenching to strengthen can replace the high alloy heavy rail with the common railway rail material, thereby reduces the rail cost; Also can repair the inefficacy rail, reduce waste of material, bring than the large economy benefit.
Embodiment
Embodiment one
With gasoline deoil, decontamination removal of solvents rail surface and oil contaminant and rust, further remove dirt with sand papering rail surface then, be convenient to evenly spray light-absorbing coating; The SiO that will mix with caking agent then with spray gun or brush
2Extinction coating is coated in the rail surface equably, to improve the metallic surface to CO
2The specific absorption of laser, precoating thickness are 0.02mm; Treat that coating opens DL-HL-10000 type CO after air-dry
2Laser apparatus, rapid scanning rail surface makes the rail surface realize rapid heating and cooling.Concrete processing parameter is as follows: laser power P=1.7kW, and bandwidth sizes is length * wide=30mm * 1mm, lap width is 0.5mm, scan velocity V=300mm/min.
Embodiment two
With alcohol deoil, decontamination removal of solvents rail surface and oil contaminant and rust, further remove dirt with sand papering rail surface then, be convenient to evenly spray light-absorbing coating; The SiO that will mix with caking agent then with spray gun or brush
2Extinction coating is coated in the rail surface equably, to improve the metallic surface to CO
2The specific absorption of laser, precoating thickness are 0.03mm; Treat that coating opens DL-HL-10000 type CO after air-dry
2Laser apparatus, rapid scanning rail surface makes the rail surface realize rapid heating and cooling.Concrete processing parameter is as follows: laser power P=5kW, and bandwidth sizes is length * wide=30mm * 1mm, lap width is 0.7mm, scan velocity V=500mm/min.
Embodiment three
With alcohol deoil, decontamination removal of solvents rail surface and oil contaminant and rust, further remove dirt with sand papering rail surface then, be convenient to evenly spray light-absorbing coating; The SiO that will mix with caking agent then with spray gun or brush
2Extinction coating is coated in the rail surface equably, to improve the metallic surface to CO
2The specific absorption of laser, precoating thickness are 0.04mm; Treat that coating opens DL-HL-10000 type CO after air-dry
2Laser apparatus, rapid scanning rail surface makes the rail surface realize rapid heating and cooling.Concrete processing parameter is as follows: laser power P=7kW, and bandwidth sizes is length * wide=30mm * 1mm, lap width is 0.8mm, scan velocity V=700mm/min.
Claims (1)
1, laser hardening ossifying technique of railway high speed heavy rail is characterized in that:
(1) with gasoline or alcohol deoil, decontamination removal of solvents rail surface and oil contaminant and rust, further remove dirt with sand papering rail surface then, so that evenly spray light-absorbing coating;
(2) SiO that will mix with caking agent with spray gun or brush
2Extinction coating is coated in the rail surface equably, to improve the metallic surface to CO
2The specific absorption of laser, the proportioning of coating and caking agent is: 80～100g SiO
2+ 500～600ml alcohol+15ml coating agent which has to be dissolved in alcohol before use, precoating thickness are 0.02～0.05mm;
(3) with broadband integral mirror technology circular light spot is transformed into rectangular light spot, its bandwidth sizes is length * wide=30mm * 1mm;
(4) with DL-HL-10000 type CO
2Laser apparatus rapid scanning rail surface makes the rail surface realize rapid heating and cooling;
Concrete processing parameter is as follows:
Laser power is 1.5～10kW
Bandwidth sizes is length * wide=30mm * 1mm
Lap width is 0.5～1mm
Scan velocity V=200～1000mm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100124803A CN100503842C (en) | 2007-08-16 | 2007-08-16 | Laser hardening hardening technique for railway high speed heavy rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100124803A CN100503842C (en) | 2007-08-16 | 2007-08-16 | Laser hardening hardening technique for railway high speed heavy rail |
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| Publication Number | Publication Date |
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| CN101109034A CN101109034A (en) | 2008-01-23 |
| CN100503842C true CN100503842C (en) | 2009-06-24 |
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| CNB2007100124803A Expired - Fee Related CN100503842C (en) | 2007-08-16 | 2007-08-16 | Laser hardening hardening technique for railway high speed heavy rail |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943802A (en) * | 2010-08-26 | 2011-01-12 | 中国科学院长春光学精密机械与物理研究所 | Optical device for hardening steel rail by using high-power semiconductor laser in running of train |
| CN102031343A (en) * | 2010-11-17 | 2011-04-27 | 天津大族烨峤激光技术有限公司 | Cladding device with novel wide-band integral mirror |
| CN101967540A (en) * | 2010-11-17 | 2011-02-09 | 天津大族烨峤激光技术有限公司 | Light absorption paint for laser quenching and preparation method thereof |
| CN102121064A (en) * | 2011-01-30 | 2011-07-13 | 武汉华工激光工程有限责任公司 | Off-line laser quenching process for surface strengthening treatment of steel rail |
| CN102121217B (en) * | 2011-01-30 | 2012-11-28 | 武汉武钢华工激光大型装备有限公司 | Online laser quenching process for strengthening steel rail surface |
| CN102424897A (en) * | 2011-11-19 | 2012-04-25 | 宁海县盛源激光科技有限公司 | Method for broadband laser strengthening treatment of surface of tension wheel |
| CN105200198A (en) * | 2014-06-05 | 2015-12-30 | 武汉团结点金激光制造技术有限公司 | Laser strengthening technology for surface of steel rail of railway |
| CN104212965A (en) * | 2014-09-02 | 2014-12-17 | 辽宁科技大学 | Method for online laser broadband quenching on surface of steel rail |
| CN104874918A (en) * | 2015-06-12 | 2015-09-02 | 温州大学 | Method for performing composite strengthening on welding seam of split type transmission shaft through rectangular laser spots |
| CN106555031A (en) * | 2015-09-24 | 2017-04-05 | 沈阳大陆激光技术有限公司 | The method of broadband laser strengthening treatment of surface of tension wheel |
| CN105506232B (en) * | 2015-12-10 | 2018-07-31 | 武汉华工激光工程有限责任公司 | A kind of laser multiple processing technique of adjustment steel hardness |
| CN105506233A (en) * | 2015-12-16 | 2016-04-20 | 重庆材料研究院有限公司 | Method for repairing steel rail by laser quenching surface treatment |
| CN107629530A (en) * | 2017-09-13 | 2018-01-26 | 徐州万达回转支承有限公司 | A kind of light absorption paint for laser quenching and preparation method thereof |
| CN109022744A (en) * | 2018-08-03 | 2018-12-18 | 中国科学院金属研究所 | A kind of high-speed train axle surface modifying method |
| CN114015940B (en) * | 2021-11-03 | 2022-06-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Medium-strength low-oxide-skin steel rail and production method thereof |
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2007
- 2007-08-16 CN CNB2007100124803A patent/CN100503842C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
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| 汽车用齿轮激光淬火工艺研究. 李家汉等.南昌航空工业学院学报(自然科学版)，第17卷第3期. 2003 |
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| CN101109034A (en) | 2008-01-23 |
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Effective date of registration: 20141218 Address after: 114001 Liaoning city of Anshan province high tech Zone Qianshan Road No. 368 Liaoning laser Industrial Park North Park No. 7 Building 1 floor Patentee after: Anshan continental Laser Technology Co., Ltd. Address before: 110136 justice 18, justice economic development zone, Liaoning, Shenyang Province, No. 5 Patentee before: Shenyang Dalu Laser System Co., Ltd. |
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Granted publication date: 20090624 Termination date: 20170816 |