CN102121064A - Off-line laser quenching process for surface strengthening treatment of steel rail - Google Patents
Off-line laser quenching process for surface strengthening treatment of steel rail Download PDFInfo
- Publication number
- CN102121064A CN102121064A CN2011100346843A CN201110034684A CN102121064A CN 102121064 A CN102121064 A CN 102121064A CN 2011100346843 A CN2011100346843 A CN 2011100346843A CN 201110034684 A CN201110034684 A CN 201110034684A CN 102121064 A CN102121064 A CN 102121064A
- Authority
- CN
- China
- Prior art keywords
- laser
- quenching
- rail
- rail surface
- steel rail
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Heat Treatment Of Articles (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses an off-line laser quenching process for surface strengthening treatment of a steel rail. The process comprises the following steps of: coating a layer of light absorption coating on the surface of the steel rail, then moving the steel rail, and scanning the surface of the steel rail by using pulse laser along the length direction at a certain speed to obtain latticed tissues, namely fine martensitic laser quenching points on the surface of the steel rail, wherein the area of the laser quenching points is 50 to 80 percent of the area of the surface of the steel rail, and the highest depth of the quenching points is 0.4 to 1.0 millimeter. In the off-line laser quenching process, the latticed quenching points can be formed on the surface of the steel rail, the quenching point tissues are martensitic tissues, the depth of the quenching layer is 0.4 to 1.0 millimeter, the hardness is more than HV700, and the fine martensite of the laser quenching points has high hardness and abrasion resistance. The toughness of the steel rail is reserved for pearlite in an untreated area, and the complex phase tissues of the martensite and the pearlite have good toughness and can remarkably prolong the service life of the steel rail.
Description
Technical field
The present invention relates to laser surface intensified field, specifically be meant a kind of off-line laser-quenching technique that is used for the rail surface Hardening Treatment.
Technical background
Rail is the major parts of track traffic, and rail directly contacts with the wheel of train, and the quality of its quality directly has influence on traveling security and stationarity.The main rail steel grade of China railways mainly is U71Mn and U75V, is the plain carbon stool rail.Along with train speed, freight volume and the heavy raising of axle, the speed of these two kinds of rail failures is more and more faster, exposed the bearing capacity deficiency, wear resistance is not enough, the problem that work-ing life is not long, the security incident that makes rail failure cause happens occasionally, and China is used to change and keep in repair the direct expenses of damage rail every year up to billions of units.Rail failure is a key issue in the transportation by railroad always, and type of impairment mainly is rail conquassation, side grinding, ripple mill and peels off, accounts for more than 80% of rail failure amount.Up to now, how effectively alleviating and eliminating these track defects does not also have effective solution, has only and adopts the mode of directly changing rail, makes the railway operation cost high.
At present, have the investigator to inquire into the damage type of these several rail, think that the rail failure aggravation mainly is because between the wheel track due to the increase of skin friction force, and to improve rail quality be the prevention rail failure, the main method that prolongs rail life.In order to improve the work-ing life of railway rail, generally take three kinds of methods both at home and abroad: the first, adopt the induction full length quenching, the control cooling rate obtains the fine pearlite tissue, strengthens rail toughness; The second, adopt low-alloy high-carbon steel to replace general carbon steel; The 3rd, adopt bainitic steel or low-carbon martensitic steels to replace high carbon steel, further improve the surface hardness of rail etc.
But aforesaid method respectively has deficiency.In the past few years, the total length quenching technology has been obtained significant effect, makes the wear resistance of rail improve 50% (straight way) and 100% (bend) respectively.But, a large amount of practices show that martensite even bainite structure can not appear in the surface of induction full quenching rail, otherwise will reduce the fracture toughness property of rail significantly, cause rail to occur accidents such as disconnected rail under arms in the process, badly influence the safe operation of railway.Therefore, full quenching rail hardness generally is controlled between the HV320-390, and the excavation of its wear resistance potentiality is near the limit.The low-alloy high-carbon steel rail combines with the total length quenching technology, can further improve the rail wear resistance, but effect is not remarkable.Low carbon martensite rail and bainite rail still are in development, and the weldability aspect of rail also exists very big problem and difficulty.
Laser surface hardening technology is recent two decades development one of metal material surface reinforcement very rapidly, it comprises technologies such as laser quenching, consolidation quenching, surface alloying and surface cladding, its common feature is that rate of heating is fast, the heat affected zone is little, workpiece deformation is little, therefore be expected to replace the induction full length quenching, become the rail surface intensified technique of a new generation.
Notification number is to disclose a kind of laser hardening ossifying technique of railway high speed heavy rail in the Chinese invention patent " laser hardening ossifying technique of railway high speed heavy rail " of CN101109034, by the SiO that mixes in the spraying of heavy rail surface
2Extinction coating improves the metallic surface to CO
2The specific absorption of laser adopts the broadband integral mirror to change laser facula into rectangular light spot, utilizes CO
2Laser apparatus rapid scanning rail surface makes the rail surface realize rapid heating and cooling, is 0.5-1.0mm thereby obtain thickness, and hardness is 800-1100HV, is organized as high carbon martensite and a small amount of austenitic quench-hardened case.
But the heavy rail laser quenching hardening process that above-mentioned technology proposed has following deficiency: adopt laser that rail is carried out whole quenching, when improving rail hardness, reduce the toughness of rail, occurred cracking phenomena easily after making the major parts (as tongue, guard rail, stock rail, frog) of track switch part quench.
Summary of the invention
The objective of the invention is deficiency, a kind of off-line laser-quenching technique that is used for the rail surface Hardening Treatment is provided, make it can improve rail hardness simultaneously, and keep the toughness of rail itself at the existence of above-mentioned background technology.
For achieving the above object, the present invention adopts following technical scheme: a kind of rail surface-treated off-line laser-quenching technique that is used for, its step comprises: at first at rail surface-coated one deck extinction coating, mobile then rail makes pulse laser scan with certain speed along its length on the rail surface, obtain being the laser quenching point that is organized as tiny martensite of latticed layout on the rail surface, described laser quenching point area is the 50-80% of rail surface area, the most deep degree of quenching point 0.4-1.0mm.
In such scheme, described quenching point is circular or oval.
Preferably, described extinction coating employing massfraction is the Al of 60-70%
2O
3Particle, massfraction are the ZrO of 10-22%
2Particle and massfraction are the SiO of 12-20%
2Particle, water mixes.
Preferably, described Al
2O
3Particle, ZrO
2Particle and SiO
2Particle is a particle diameter less than 1 micron submicron particles.
Preferably, the described thickness that is coated in rail surface extinction coating is 0.01-0.1mm.
In such scheme, described pulse laser is meant from CO
2The power that laser apparatus sends is 0.9-7kW, and pulsewidth is the pulse laser of 0.1-1s.
Preferably, described pulse CO
2Laser facula is circular, and diameter is 3-10mm.
In such scheme, described CO
2Laser apparatus is positioned on the lathe, and described rail is realized the function that pulse laser scans with certain speed along its length on the rail surface by towing mechanism along moving of lathe length direction.
In off-line laser-quenching technique of the present invention, because pulse laser scans with certain speed on the rail surface, scanning is in rapid heating and cooling fast under the lasing, can form the quenching point of latticed layout on the rail surface, quenching point is organized as martensitic stucture, the quenching layer depth is 0.4-1.0mm, and more than the hardness HV700, the tiny martensite of laser quenching point has high hardness and wear resistance.The district of being untreated has kept the toughness of rail itself for perlite, thisly adds pearlitic heterogeneous structure by martensite, has good obdurability, can significantly improve the work-ing life of rail.Simultaneously, the present invention utilized spray gun or hairbrush at rail surface-coated one deck extinction coating before laser scanning, can improve the assimilated efficiency of rail to laser, and the extinction coating of this proportioning is to CO
2The assimilated efficiency of laser is best.
Off-line laser-quenching technique conveniently regulating and controlling of the present invention, do not need quenchant, do not need tempering, workpiece deformation is little, therefore can directly reach rail surface strengthening effect by mobile rail on lathe.And the laser processing technology of lathe is ripe, can carry out simple modifications on prior art and can realize off-line laser quenching.
The present invention utilizes pulse laser that the point-like quenching strengthening is carried out on the rail surface and handles, by parameters such as control laser power, sweep velocity and circular light spot diameters, form the quenching point of latticed layout on the rail surface, simultaneously because the toughness of rail itself, when making major parts (as tongue, guard rail, stock rail, frog) the wear resistance raising of track switch part, reduced the rimose risk.
Description of drawings
Fig. 1 is latticed quench zone synoptic diagram;
Fig. 2 is the schematic cross-section of quenching point;
Fig. 3 is the graph of relation of quenching point place different depths and hardness among the embodiment 1;
Fig. 4 is the graph of relation of quenching point place different depths and hardness among the embodiment 2;
1. quenching point, 2. be untreated district, 3. Cooling Velocity of Hardened Layer of Laser Quenching, 4. laser quenching heat affected zone of rail base material.
Embodiment
Feature of the present invention and correlated characteristic are described in further details by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding.
Embodiment 1:
After at first using oxide compound such as sand papering rail surface removal rail surface iron rust and dirt, further remove the rail surface and oil contaminant with alcohol, so that light-absorbing coating absorption.Be 60% Al again with massfraction
2O
3Particle, massfraction are 20% ZrO
2Particle and massfraction are 20% SiO
2Particle mixes with water and obtains extinction coating.Described Al
2O
3Particle, ZrO
2Particle and SiO
2Particle is a particle diameter less than 1 micron submicron particles.U71Mn rail surface after cleaning makes it to form the sprayed coating that thickness is 0.01mm with spray gun spraying one deck extinction coating then.At last, promote rail by towing mechanism and move with speed 10mm/s at cantilevered laser process machine upper edge long axis direction, lathe is the moving structures of five coordinate tetrads, and laser maintains static and impinge perpendicularly on workpiece surface.Described pulse laser realizes that by fan blade formula episcotister described fan blade formula episcotister is installed in CO
2On the output light path of laser apparatus, chop CO off
2The continuous laser that laser apparatus sends.Control blade steel axle makes its uniform rotation, and when fan blade moved on the laser optical path, light path is blocked can't bright dipping; When fan blade is left laser optical path, the normal bright dipping of light path, the fan blade movement continuously forms pulse laser.Described pulsed laser power is 1.5kW, and pulsewidth is the laser of 0.3s, and laser facula is circular, and diameter is 5mm.
As shown in Figure 1, quenching point 1 of the present invention is circular, and diameter is 5mm, latticed layout, between quenching point along the long-pending 5mm that is spaced apart laser pulse width 0.3s and rail translational speed 10mm/s of rail travel direction.The schematic cross-section of quenching point 1 as shown in Figure 2, the hardness of quenching point and quenching point to the relation of surface distance as shown in Figure 3, can obtain more than the hardness HV880 laser quenching hardened layer of layer depth 0.6mm.
Behind oxide compound such as sand papering rail surface removal rail surface iron rust and dirt, further remove the rail surface and oil contaminant with alcohol again, so that light-absorbing coating absorption.Be 70% Al again with massfraction
2O
3Particle, massfraction are 18% ZrO
2Particle and massfraction are 12% SiO
2Particle mixes with water and obtains extinction coating.Described Al
2O
3Particle, ZrO
2Particle and SiO
2Particle is a particle diameter less than 1 micron submicron particles.U75V rail surface after cleaning is coated with last layer extinction coating with hairbrush then, makes it to form the sprayed coating that thickness is 0.01mm.At last, promote rail by towing mechanism and move with speed 8mm/s at cantilevered laser process machine upper edge long axis direction, lathe is the moving structures of five coordinate tetrads, and laser maintains static and impinge perpendicularly on workpiece surface.Described pulse laser realizes that by fan blade formula episcotister described fan blade formula episcotister is installed in CO
2On the output light path of laser apparatus, chop CO off
2The continuous laser that laser apparatus sends.Control blade steel axle makes its uniform rotation, and when fan blade moved on the laser optical path, light path is blocked can't bright dipping; When fan blade is left laser optical path, the normal bright dipping of light path, the fan blade movement continuously forms pulse laser.Described pulse CO
2Laser is that power is 1.0kW, and pulsewidth is the pulse laser of 0.5s, and laser facula is circular, and diameter is 2mm, between quenching point along the 1mm that is spaced apart of laser apparatus travel direction.
Under these processing condition, the hardness of quenching point and quenching point to the relation of surface distance as shown in Figure 4, can obtain more than the hardness HV760 laser quenching hardened layer of layer depth 0.8mm.
Behind oxide compound such as sand papering rail surface removal rail surface iron rust and dirt, further remove the rail surface and oil contaminant with alcohol again, so that light-absorbing coating absorption.Be 70% Al again with massfraction
2O
3Particle, massfraction are 18% ZrO
2Particle and massfraction are 12% SiO
2Particle mixes with water and obtains extinction coating.Described Al
2O
3Particle, ZrO
2Particle and SiO
2Particle is a particle diameter less than 1 micron submicron particles.U71Mn rail surface after cleaning makes it to form the sprayed coating that thickness is 0.1mm with spray gun spraying one deck extinction coating then.At last, promote rail by towing mechanism and move with speed 14mm/s at cantilevered laser process machine upper edge long axis direction, lathe is the moving structures of five coordinate tetrads, and laser maintains static and impinge perpendicularly on workpiece surface.Described pulse laser realizes that by fan blade formula episcotister described fan blade formula episcotister is installed in CO
2On the output light path of laser apparatus, chop CO off
2The continuous laser that laser apparatus sends.Control blade steel axle makes its uniform rotation, and when fan blade moved on the laser optical path, light path is blocked can't bright dipping; When fan blade is left laser optical path, the normal bright dipping of light path, the fan blade movement continuously forms pulse laser.Described pulse CO
2Laser is that power is 3.0kW, and pulsewidth is the pulse laser of 0.1s, and laser facula is circular, and diameter is 8mm, between quenching point along the 1.4mm that is spaced apart of laser apparatus travel direction.
Under these processing condition, the quenching point hardness that obtains can reach HV700, and case depth can reach the rail of 0.7mm.
Claims (8)
1. one kind is used for rail surface-treated off-line laser-quenching technique, its step comprises: at first at rail surface-coated one deck extinction coating, mobile then rail makes pulse laser scan with certain speed along its length on the rail surface, obtain being the laser quenching point that is organized as tiny martensite of latticed layout on the rail surface, described laser quenching point area is the 50-80% of rail surface area, the most deep degree of quenching point 0.4-1.0mm.
2. the online laser-quenching technique of rail surface-treated that is used for according to claim 1 is characterized in that: described quenching point is for circular or oval.
3. the online laser-quenching technique of rail surface-treated that is used for according to claim 1 is characterized in that: it is the Al of 60-70% that described extinction coating adopts massfraction
2O
3Particle, massfraction are the ZrO of 10-22%
2Particle and massfraction are the SiO of 12-20%
2Particle, water mixes.
4. the online laser-quenching technique of rail surface-treated that is used for according to claim 3 is characterized in that: described Al
2O
3Particle, ZrO
2Particle and SiO
2Particle is a particle diameter less than 1 micron submicron particles.
5. the online laser-quenching technique of rail surface-treated that is used for according to claim 3 is characterized in that: the described thickness that is coated in rail surface extinction coating is 0.01-0.1mm.
6. the online laser-quenching technique of rail surface-treated that is used for according to claim 1, it is characterized in that: described pulse laser is meant from CO
2The power that laser apparatus sends is 0.9-7kW, and pulsewidth is the pulse laser of 0.1-1s.
7. the online laser-quenching technique of rail surface-treated that is used for according to claim 6 is characterized in that: described pulse CO
2Laser facula is circular, and diameter is 3-10mm.
8. the online laser-quenching technique of rail surface-treated that is used for according to claim 6 is characterized in that: described CO
2Laser apparatus is positioned on the lathe, and described rail is realized the function that pulse laser scans with certain speed along its length on the rail surface by towing mechanism along moving of lathe length direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100346843A CN102121064A (en) | 2011-01-30 | 2011-01-30 | Off-line laser quenching process for surface strengthening treatment of steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100346843A CN102121064A (en) | 2011-01-30 | 2011-01-30 | Off-line laser quenching process for surface strengthening treatment of steel rail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102121064A true CN102121064A (en) | 2011-07-13 |
Family
ID=44249730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100346843A Pending CN102121064A (en) | 2011-01-30 | 2011-01-30 | Off-line laser quenching process for surface strengthening treatment of steel rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102121064A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758207A (en) * | 2012-06-29 | 2012-10-31 | 上海市机械制造工艺研究所有限公司 | Complex heat treatment technology capable of improving surface performance of steel workpiece |
| CN104087722A (en) * | 2014-07-14 | 2014-10-08 | 武汉钢铁(集团)公司 | Steel rail and surface treatment method thereof |
| 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 |
| 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 |
| CN107881294A (en) * | 2016-09-30 | 2018-04-06 | 李尔公司 | Laser spots are hardened |
| 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 |
| CN109355462A (en) * | 2018-12-12 | 2019-02-19 | 武汉华工激光工程有限责任公司 | A kind of process and device of selective laser quenching |
| CN112501965A (en) * | 2020-11-07 | 2021-03-16 | 西南交通大学 | Method for controlling wavy abrasion of railway steel rail |
| CN112831638A (en) * | 2020-12-31 | 2021-05-25 | 华南理工大学 | High-precision metal surface composite strengthening processing method and device |
| CN113720841A (en) * | 2021-08-25 | 2021-11-30 | 武汉飞能达激光技术有限公司 | Laser quenching quality monitoring method and application thereof |
| CN114425649A (en) * | 2022-01-10 | 2022-05-03 | 江苏大学 | Laser shape composite processing method for improving 40Cr tribological performance and composite surface |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2496915Y (en) * | 2001-03-22 | 2002-06-26 | 张准胜 | Railway steel rail of surface phase-transformation hardening by laser |
| CN2622241Y (en) * | 2002-01-22 | 2004-06-30 | 张准胜 | Laser maintenance vehicle for railway track |
| CN1603425A (en) * | 2003-09-29 | 2005-04-06 | 浙江工业大学 | Metal laser deep-layer quenching process |
| WO2005080686A1 (en) * | 2004-02-23 | 2005-09-01 | Sandro Favilli | Hardening process using laser in railway applications and relative equipment |
| CN101109034A (en) * | 2007-08-16 | 2008-01-23 | 沈阳大陆激光成套设备有限公司 | Laser hardening ossifying technique of railway high speed heavy rail |
| CN101403030A (en) * | 2008-03-10 | 2009-04-08 | 华中科技大学 | On-line laser machining apparatus for strengthening and toughening treatment of steel rail surface |
| CN101665862A (en) * | 2009-10-15 | 2010-03-10 | 武汉华工激光成套设备有限公司 | Surface laser quenching process of car panel die |
-
2011
- 2011-01-30 CN CN2011100346843A patent/CN102121064A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2496915Y (en) * | 2001-03-22 | 2002-06-26 | 张准胜 | Railway steel rail of surface phase-transformation hardening by laser |
| CN2622241Y (en) * | 2002-01-22 | 2004-06-30 | 张准胜 | Laser maintenance vehicle for railway track |
| CN1603425A (en) * | 2003-09-29 | 2005-04-06 | 浙江工业大学 | Metal laser deep-layer quenching process |
| WO2005080686A1 (en) * | 2004-02-23 | 2005-09-01 | Sandro Favilli | Hardening process using laser in railway applications and relative equipment |
| CN101109034A (en) * | 2007-08-16 | 2008-01-23 | 沈阳大陆激光成套设备有限公司 | Laser hardening ossifying technique of railway high speed heavy rail |
| CN101403030A (en) * | 2008-03-10 | 2009-04-08 | 华中科技大学 | On-line laser machining apparatus for strengthening and toughening treatment of steel rail surface |
| CN101665862A (en) * | 2009-10-15 | 2010-03-10 | 武汉华工激光成套设备有限公司 | Surface laser quenching process of car panel die |
Non-Patent Citations (3)
| Title |
|---|
| 《激光杂志》 20021231 职亚楠等 U74钢轨表面激光淬火工艺及其对耐磨性的影响 , 2 * |
| 《金属热处理》 20081231 苏国强等 大功率半导体激光相变硬化U74轨钢的试验 , * |
| 苏国强等: "大功率半导体激光相变硬化U74轨钢的试验", 《金属热处理》, 31 December 2008 (2008-12-31) * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758207A (en) * | 2012-06-29 | 2012-10-31 | 上海市机械制造工艺研究所有限公司 | Complex heat treatment technology capable of improving surface performance of steel workpiece |
| 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 |
| CN104087722A (en) * | 2014-07-14 | 2014-10-08 | 武汉钢铁(集团)公司 | Steel rail and surface treatment method thereof |
| 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 |
| CN107881294A (en) * | 2016-09-30 | 2018-04-06 | 李尔公司 | Laser spots are hardened |
| 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 |
| CN109355462A (en) * | 2018-12-12 | 2019-02-19 | 武汉华工激光工程有限责任公司 | A kind of process and device of selective laser quenching |
| CN112501965A (en) * | 2020-11-07 | 2021-03-16 | 西南交通大学 | Method for controlling wavy abrasion of railway steel rail |
| CN112831638A (en) * | 2020-12-31 | 2021-05-25 | 华南理工大学 | High-precision metal surface composite strengthening processing method and device |
| CN113720841A (en) * | 2021-08-25 | 2021-11-30 | 武汉飞能达激光技术有限公司 | Laser quenching quality monitoring method and application thereof |
| CN113720841B (en) * | 2021-08-25 | 2024-02-09 | 武汉飞能达激光技术有限公司 | Laser quenching quality monitoring method and application thereof |
| CN114425649A (en) * | 2022-01-10 | 2022-05-03 | 江苏大学 | Laser shape composite processing method for improving 40Cr tribological performance and composite surface |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102121064A (en) | Off-line laser quenching process for surface strengthening treatment of steel rail | |
| CN102121217B (en) | Online laser quenching process for strengthening steel rail surface | |
| US20200199698A1 (en) | Method for reinforcing rail by laser and auxiliary heat source efficient hybrid cladding | |
| CN100503842C (en) | Laser hardening hardening technique for railway high speed heavy rail | |
| Leunda et al. | Laser cladding of vanadium-carbide tool steels for die repair | |
| Ding et al. | Investigation on the rolling wear and damage properties of laser discrete quenched rail material with different quenching shapes and patterns | |
| CN101240367A (en) | On-line laser processing device used for railway steel rail surface toughening treatment | |
| CN102581241A (en) | Secondary automatic cutting system of continuous casting slab | |
| CN101474740A (en) | Production method of ultralong welding rail and production chain | |
| CN109022744A (en) | A kind of high-speed train axle surface modifying method | |
| WO2005080686A1 (en) | Hardening process using laser in railway applications and relative equipment | |
| CN110592367A (en) | Point-like treatment method for steel rail surface by laminar plasma technology | |
| CN104212965A (en) | Method for online laser broadband quenching on surface of steel rail | |
| WO2023284187A1 (en) | Method for laser strengthening and toughening treatment of steel rail welding joint | |
| CN107881498B (en) | A kind of railway track laser reinforcing alloyage process | |
| CN105506232B (en) | A kind of laser multiple processing technique of adjustment steel hardness | |
| CN102094111A (en) | Bar hot shear blade laser-quenching manufacturing process | |
| CN110172546A (en) | Based on laser-induction heat source Rail Surface functionally gradient strengthening layer preparation method | |
| EP0266167A1 (en) | Insitu energy beam processing of railroad track and equipment for increasing service lifetime | |
| CN209836225U (en) | Online mobile processing device for steel rail surface based on laminar plasma | |
| CN102676749A (en) | Laser heat treatment hardening method for steel pipe cast iron roll surface | |
| CN107287406A (en) | A kind of online controlled cooling device and cooling means | |
| CN115491484B (en) | Temperature control laser heat treatment method for double-beam modulation scanning | |
| CN201206156Y (en) | On-line laser machining apparatus for strengthening and toughening treatment of railway track surface | |
| CN102953302A (en) | Combined laser strengthening method for ramp/curve rail and turnout assembly and straight road rail and turnout assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: WUHAN WUGANG HUAGONG LARGE LASER EQUIPMENT CO., LT Free format text: FORMER OWNER: HUAGONG LASER ENGINEERING CO LTD, WUHAN Effective date: 20120704 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 430223 WUHAN, HUBEI PROVINCE TO: 430023 WUGANG HIGH-TECH INDUSTRIES, DONGHUXIN TECHNOLOGY DEVELOPMENT DISTRICT, WUHAN CITY, WUHAN CITY, HUBEI PROVINCE |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20120704 Address after: 430023 Wuhan hi tech Industrial Park, Wuhan hi tech Development Zone, Wuhan, Hubei, Wuhan, East Lake Applicant after: Wuhan WISCO-HGLaser Large Scale Equipment Co., Ltd. Address before: 430223 Hubei city of Wuhan province Huazhong University of Science and Technology science and Technology Park of East Lake high tech Development Zone Science and Technology Industrial Park laser Applicant before: Huagong Laser Engineering Co., Ltd., Wuhan |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110713 |