CN106337179A - Laser surface alloying treatment process for heating furnace hearth roll collar - Google Patents
Laser surface alloying treatment process for heating furnace hearth roll collar Download PDFInfo
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- CN106337179A CN106337179A CN201510391499.8A CN201510391499A CN106337179A CN 106337179 A CN106337179 A CN 106337179A CN 201510391499 A CN201510391499 A CN 201510391499A CN 106337179 A CN106337179 A CN 106337179A
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Abstract
The invention relates to a laser surface alloying treatment process for a heating furnace hearth roll collar. The process includes the steps of: adopting chromium nickel carbon alloy powder comprising the following components by weight percentage: 65%-80% of Cr, 17%-28% of Ni, and 3%-7% of C; selecting phi 3mm narrowband light spot or 10*1mm broadband light spot to scan the matrix; starting a CO2 laser, using a CNC laser processing machine as the work platform; employing a coaxial or paraxial powder feeding device to send the alloy powder automatically into a laser molten pool so as to form a uniform and compact alloying coating on the roll collar surface with a thickness of 0.3-0.5mm; and performing crack and flaw detection and judging whether crack is produced. The process provided by the invention reinforces the hearth roll collar surface, improves the service life of the roll collar, basically solves the problem of nodulation on the roll collar surface, saves the roll changing time and maintenance time, improves the heating furnace work efficiency, and reduces the production cost.
Description
Technical field
The present invention relates to heating-furnace bottom roller collars surface intensified technique field, specially a kind of laser surface alloying handling process of heating-furnace bottom roller collars.
Background technology
Hearth roll is the key components and partss in metallurgy industry various heat treatment part course of conveying, and it is widely used in various heat-treatment furnaces, including continuous annealing furnace, heating furnace, heat treatment normalizing furnace etc..Heating-furnace bottom roller plays the effect of transporting steel billet, and in order to ensure that steel billet occurs without quality problems in the follow-up operation of rolling, prevents from forming dross thing on steel rod surface when steel rod and steel plate high temperature contact most important.Heating-furnace bottom roller collars uses co50 alloy material now commonplacely, and this kind of material to be hearth roll manufacture the top material in field, cost intensive, it is in use, collars face also cannot overcome the problem of dross completely, result in the need for the online hearth roll of periodic replacement and carry out even scrapping except tumor reparation of collars, have a strong impact on manufacturing schedule, considerably increase the operating cost of heating furnace.
Heating-furnace bottom roller is the key components and partss of transporting steel billet, and existing have the manufacture for heating-furnace bottom roller for the kinds of processes method, and the selection of wherein co sill occupies highly important status.As collars total part adopts co50 material, made using integral casting method, it is characterized in high temperature oxidation resisting, and having the ability keeping hardness under certain high temperature, it also has original realization in terms of elevated temperature strength, heat shock resistance and abrasion resistance properties, but the hearth roll being manufactured with this kind of method, sufficiently expensive, and also cannot avoid the generation of collars face dross phenomenon in lifetime, therefore, the manufacture that application method for surface hardening carries out hearth roll is also the direction of people's effort always.Praxair company employs under the working environment more than 900 DEG C for the furnace temperature and carries out chromium carbide and the process meanses of cobalt-based high-temperature alloy spraying in roll surface, result hearth roll also can occur dross in use, or even partial coating produces initial failure, comes off.Also there is the trial in hearth roll surface spray-coating oxide ceramics at present, as zirconia-yttria system and alumina chromia system, these ceramic coatings have very strong anti-dross effect at high temperature, but unstable at high operating temperatures, or even can separate out element generation chemical reaction with surface of steel plate.
Laser surface alloying processing method, as heat spraying method, is a kind of surface intensified technique means.Prepare functional type coating using it in material surface and form a layer function coating with using heat spraying method in general material surface, thus reach mentality of designing that is cost-effective and ensureing product serviceability purpose coming down in a continuous line.For the dross of hearth roll collars face, have the advantage that 1. laser surface alloying methods using laser surface alloying process than traditional heat spraying method, what the strengthened coat that it forms and base material were formed is metallurgical binding rather than mechanical bond, and therefore coating will not produce early fallout；2. its compactness of coating top layer of application laser surface alloying method preparation is better than sprayed coating, and the mechanism and cause due to hearth roll furnace sow, and its anti-nodulation ability of coating surface of laser surface cladding method preparation is better than sprayed coating.
From same coated powder system, laser surface alloying method keep above-mentioned be compared to heat spraying method advantage while do not lose that its machining deformation is little, strengthening layer tissue is fine and closely woven again, high degree of automation the advantages of, therefore apply it to carry out surface alloying process to hearth roll collars face.
Content of the invention
Technical problem solved by the invention is to provide a kind of laser surface alloying handling process of heating-furnace bottom roller collars, to solve the problems, such as to propose in above-mentioned background technology.
Technical problem solved by the invention employs the following technical solutions to realize:
A kind of laser surface alloying handling process of heating-furnace bottom roller collars, comprises the following steps that:
(1) oil removing, rust cleaning are carried out to heating-furnace bottom roller collars face, and eye slab working position is tested；
(2) selection of alloy powder and automatic powder feeding system: using chromium nickel carbon alloy powder, its composition by weight percentage is: cr:65%-80%, ni:17%-28%, c:3%-7%；Using coaxial or paraxonic automatic powder feeding system；
(3) selection of scan mode: matrix is scanned from φ 3mm arrowband hot spot or 10 × 1mm broadband hot spot；
(4) wear-resistant surface Laser Alloying Treatment: open co2Laser instrument, work platformses are CNC laser processing machine；Alloy powder is automatically fed into by laser molten pool using coaxial or paraxonic dust feeder, forms the alloying coating of even compact in collars face, its thickness is in 0.3-0.5mm；Its technological parameter is as follows:
Focus lamp f=300-400mm
Alloying power p=2000-5000w
Spot size d=3-10mm
Scanning speed v=600-1500mm/min
Overlapping rate 40%-60%；
(5) the alloying coating of preparation in step (4) is carried out with crack-detecting to detect and determine whether crackle generation.
As the further scheme of the present invention: step (1) is: with abluent, oil removing, rust cleaning are carried out to heating-furnace bottom roller collars face under room temperature, and clean with alcohol washes；With Dye inspectiong, eye slab working position is tested it is desirable to working position flawless, pore, be mingled with.
As the further scheme of the present invention: the composition by weight percentage of the chromium nickel carbon alloy powder described in step (2) is: cr:71%, ni:24%, c:5%.
As the further scheme of the present invention: the thickness of alloying coating described in step (4) is 0.4mm.
As the present invention further scheme: the specific process parameter of step (4) is as follows:
Focus lamp f=350mm
Alloying power p=3500w
Spot size d=6mm
Scanning speed v=1000mm/min
Overlapping rate 50%.
The present invention adopts laser surface alloying technique, alloying coating structure is mainly made up of chromium carbide and the ultra-fine as-cast structure of supersaturated solid solution, keep stiffness capabilities very strong under this tissue hyperthermia, and in the presence of strengthening mechanism in refined crystalline strengthening, solution strengthening, dispersion-strengtherning three, the hardness number of alloying coating can be maintained at higher level, and is not less than the coating of heat spraying method preparation.In addition, the alloying coating being formed according to existing theory, Laser Alloying Treatment, its high temperature wear resistant performance, pyro-oxidation resistance, high-temperature corrosion resistance performance are all very excellent.For the problem of hearth roll collars face dross, the high-compactness of alloying coating and high rigidity ensure that the good behaviour of its resistive connection tumor, and product also shows anti-Noduling ability well in use really.
Beneficial effect
Invention enhances hearth roll collars face, improve collars service life, substantially solve the problems, such as collars face dross, saved roll changing time and maintenance time, improve heating furnace working performance, reduce production cost；In addition, laser-alloying Technolgy environmentally safe, radiationless, the low feature of low noise, high yield rate, integrated cost.Therefore, surface Hardening Treatment is carried out to hearth roll collars face using laser alloying technology and will produce significant economic benefit and social benefit.
Specific embodiment
In order that realize technological means, creation characteristic, reached purpose and effect of the present invention are easy to understand, with reference to embodiment, the present invention is expanded on further.
Embodiment 1
A kind of laser surface alloying handling process of heating-furnace bottom roller collars, comprises the following steps that:
(1) with abluent, oil removing, rust cleaning are carried out to heating-furnace bottom roller collars face under room temperature, and clean with alcohol washes；With Dye inspectiong, eye slab working position is tested it is desirable to working position flawless, pore, the defect such as be mingled with；
(2) selection of alloy powder and automatic powder feeding system: from the resistant to elevated temperatures chromium nickel carbon alloy powder of independent research, its composition by weight percentage is: cr:71%, ni:24%, c:5%；Using coaxial powder-feeding mode；
(3) selection of scan mode: matrix is scanned from φ 3mm arrowband hot spot；
(4) wear-resistant surface Laser Alloying Treatment: open 5000 types co2Laser instrument, work platformses are simens CNC laser processing machine；Alloy powder is automatically fed into by laser molten pool using coaxial or paraxonic dust feeder, forms the alloying coating of even compact in collars face, its thickness is in 0.3mm；Its technological parameter is as follows:
Focus lamp f=315mm
Alloying power p=3500w
Spot size d=3mm
Scanning speed v=1000mm/min
Overlapping rate 50%；
(5) the alloying coating of preparation in step (4) is carried out with crack-detecting to detect and determine whether crackle generation.
Embodiment 2
A kind of laser surface alloying handling process of heating-furnace bottom roller collars, comprises the following steps that:
(1) with abluent, oil removing, rust cleaning are carried out to heating-furnace bottom roller collars face under room temperature, and clean with alcohol washes；With Dye inspectiong, eye slab working position is tested it is desirable to working position flawless, pore, the defect such as be mingled with；
(2) selection of alloy powder and automatic powder feeding system: from the resistant to elevated temperatures chromium nickel carbon alloy powder of independent research, its composition by weight percentage is: cr:71%, ni:24%, c:5%；Using paraxonic automatic powder feeding system；
(3) selection of scan mode: matrix is scanned from 10 × 1mm broadband hot spot；
(4) wear-resistant surface Laser Alloying Treatment: open 5000 types co2Laser instrument, work platformses are simens CNC laser processing machine.Alloy powder is automatically fed into by laser molten pool using coaxial or paraxonic dust feeder, forms the alloying coating of even compact in collars face, its thickness is in 0.5mm；Its technological parameter is as follows:
Focus lamp f=312mm
Alloying power p=3800w
Spot size d=10mm
Scanning speed v=800mm/min
Overlapping rate 50%；
(5) the alloying coating of preparation in step (4) is carried out with crack-detecting to detect and determine whether crackle generation.
Embodiment 3
A kind of laser surface alloying handling process of heating-furnace bottom roller collars, comprises the following steps that:
(1) with abluent, oil removing, rust cleaning are carried out to heating-furnace bottom roller collars face under room temperature, and clean with alcohol washes；With Dye inspectiong, eye slab working position is tested it is desirable to working position flawless, pore, the defect such as be mingled with；
(2) selection of alloy powder and automatic powder feeding system: from the resistant to elevated temperatures chromium nickel carbon alloy powder of independent research, its composition by weight percentage is: cr:65%, ni:28%, c:7%；Using coaxial powder-feeding mode；
(3) selection of scan mode: matrix is scanned from φ 3mm arrowband hot spot；
(4) wear-resistant surface Laser Alloying Treatment: open 5000 types co2Laser instrument, work platformses are simens CNC laser processing machine.Alloy powder is automatically fed into by laser molten pool using coaxial or paraxonic dust feeder, forms the alloying coating of even compact in collars face, its thickness is in 0.3mm；Its technological parameter is as follows:
Focus lamp f=300mm
Alloying power p=2000w
Spot size d=3mm
Scanning speed v=600mm/min
Overlapping rate 40%；
(5) the alloying coating of preparation in step (4) is carried out with crack-detecting to detect and determine whether crackle generation.
Embodiment 4
A kind of laser surface alloying handling process of heating-furnace bottom roller collars, comprises the following steps that:
(1) with abluent, oil removing, rust cleaning are carried out to heating-furnace bottom roller collars face under room temperature, and clean with alcohol washes；With Dye inspectiong, eye slab working position is tested it is desirable to working position flawless, pore, the defect such as be mingled with；
(2) selection of alloy powder and automatic powder feeding system: from the resistant to elevated temperatures chromium nickel carbon alloy powder of independent research, its composition by weight percentage is: cr:80%, ni:17%, c:3%；Using paraxonic automatic powder feeding system；
(3) selection of scan mode: matrix is scanned from 10 × 1mm broadband hot spot；
(4) wear-resistant surface Laser Alloying Treatment: open 5000 types co2Laser instrument, work platformses are simens CNC laser processing machine；Alloy powder is automatically fed into by laser molten pool using coaxial or paraxonic dust feeder, forms the alloying coating of even compact in collars face, its thickness is in 0.5mm；Its technological parameter is as follows:
Focus lamp f=400mm
Alloying power p=5000w
Spot size d=10mm
Scanning speed v=1500mm/min
Overlapping rate 60%；
(5) the alloying coating of preparation in step (4) is carried out with crack-detecting to detect and determine whether crackle generation.
Ultimate principle and principal character and the advantages of the present invention of the present invention have been shown and described above.It should be understood by those skilled in the art that; the present invention is not restricted to the described embodiments; merely illustrating the principles of the invention described in above-described embodiment and description; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within scope of the claimed invention.The claimed scope of the present invention is by appending claims and its equivalent thereof.
Claims (5)
1. a kind of laser surface alloying handling process of heating-furnace bottom roller collars is it is characterised in that comprise the following steps that:
(1) oil removing, rust cleaning are carried out to heating-furnace bottom roller collars face, and eye slab working position is tested；
(2) selection of alloy powder and automatic powder feeding system: using chromium nickel carbon alloy powder, its composition by weight percentage is: cr:65%-80%, ni:17%-28%, c:3%-7%；Using coaxial or paraxonic automatic powder feeding system；
(3) selection of scan mode: matrix is scanned from φ 3mm arrowband hot spot or 10 × 1mm broadband hot spot；
(4) wear-resistant surface Laser Alloying Treatment: open co2Laser instrument, work platformses are CNC laser processing machine；Alloy powder is automatically fed into by laser molten pool using coaxial or paraxonic dust feeder, forms the alloying coating of even compact in collars face, its thickness is in 0.3-0.5mm；Its technological parameter is as follows:
Focus lamp f=300-400mm
Alloying power p=2000-5000w
Spot size d=3-10mm
Scanning speed v=600-1500mm/min
Overlapping rate 40%-60%；
(5) the alloying coating of preparation in step (4) is carried out with crack-detecting to detect and determine whether crackle generation.
2. the laser surface alloying handling process of heating-furnace bottom roller collars according to claim 1 is it is characterised in that step (1) is: with abluent, oil removing, rust cleaning are carried out to heating-furnace bottom roller collars face under room temperature, and clean with alcohol washes；With Dye inspectiong, eye slab working position is tested it is desirable to working position flawless, pore, be mingled with.
3. the laser surface alloying handling process of heating-furnace bottom roller collars according to claim 1 is it is characterised in that the composition by weight percentage of the chromium nickel carbon alloy powder described in step (2) is: cr:71%, ni:24%, c:5%.
4. the laser surface alloying handling process of heating-furnace bottom roller collars according to claim 1 is it is characterised in that the thickness of alloying coating described in step (4) is 0.4mm.
5. the laser surface alloying handling process of heating-furnace bottom roller collars according to claim 1 is it is characterised in that the specific process parameter of step (4) is as follows:
Focus lamp f=350mm
Alloying power p=3500w
Spot size d=6mm
Scanning speed v=1000mm/min
Overlapping rate 50%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510391499.8A CN106337179A (en) | 2015-07-07 | 2015-07-07 | Laser surface alloying treatment process for heating furnace hearth roll collar |
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| CN201510391499.8A CN106337179A (en) | 2015-07-07 | 2015-07-07 | Laser surface alloying treatment process for heating furnace hearth roll collar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108251836A (en) * | 2018-02-01 | 2018-07-06 | 张文秀 | A kind of laser surface alloying method of hot roll |
| CN108546946A (en) * | 2018-03-30 | 2018-09-18 | 燕山大学 | A kind of laser strengthening method of heavy drill shank |
| CN114277243A (en) * | 2021-12-30 | 2022-04-05 | 安阳睿恒数控机床股份有限公司 | Roller laser line facula alloying method |
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| CN101994112A (en) * | 2009-08-24 | 2011-03-30 | 沈阳大陆激光成套设备有限公司 | Laser cladding process for abrasion-resistant anticorrosion coating of water turbine unit runner |
| CN103469199A (en) * | 2013-06-05 | 2013-12-25 | 武汉团结点金激光科技有限公司 | Laser cladding manufacturing technology of high-performance steam turbine boiler tubes |
| CN103774135A (en) * | 2013-12-31 | 2014-05-07 | 武汉团结点金激光科技有限公司 | Process for manufacturing novel hearth roll collar with laser clad composite coating |
| WO2014104902A1 (en) * | 2012-12-31 | 2014-07-03 | Plasma System S.A. | Method for regenerating and/or increasing the durability of a mill roll |
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2015
- 2015-07-07 CN CN201510391499.8A patent/CN106337179A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994112A (en) * | 2009-08-24 | 2011-03-30 | 沈阳大陆激光成套设备有限公司 | Laser cladding process for abrasion-resistant anticorrosion coating of water turbine unit runner |
| WO2014104902A1 (en) * | 2012-12-31 | 2014-07-03 | Plasma System S.A. | Method for regenerating and/or increasing the durability of a mill roll |
| CN103469199A (en) * | 2013-06-05 | 2013-12-25 | 武汉团结点金激光科技有限公司 | Laser cladding manufacturing technology of high-performance steam turbine boiler tubes |
| CN103774135A (en) * | 2013-12-31 | 2014-05-07 | 武汉团结点金激光科技有限公司 | Process for manufacturing novel hearth roll collar with laser clad composite coating |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108251836A (en) * | 2018-02-01 | 2018-07-06 | 张文秀 | A kind of laser surface alloying method of hot roll |
| CN108546946A (en) * | 2018-03-30 | 2018-09-18 | 燕山大学 | A kind of laser strengthening method of heavy drill shank |
| CN114277243A (en) * | 2021-12-30 | 2022-04-05 | 安阳睿恒数控机床股份有限公司 | Roller laser line facula alloying method |
| CN114277243B (en) * | 2021-12-30 | 2023-10-27 | 安阳睿恒数控机床股份有限公司 | Roller laser line facula alloying method |
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Application publication date: 20170118 |
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