CN102191445A - Pretreatment method for cold spray repair of crystallization roller - Google Patents
Pretreatment method for cold spray repair of crystallization roller Download PDFInfo
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- CN102191445A CN102191445A CN 201010117518 CN201010117518A CN102191445A CN 102191445 A CN102191445 A CN 102191445A CN 201010117518 CN201010117518 CN 201010117518 CN 201010117518 A CN201010117518 A CN 201010117518A CN 102191445 A CN102191445 A CN 102191445A
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- crystallization roller
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Abstract
The invention discloses a pretreatment method for cold spray repair of a crystallization roller. The method comprises the following steps of: removing a wearing layer on the surface of a matrix of the crystallization roller, rotating the crystallization roller, bombarding and cutting the surface of the crystallization roller by adopting solid-liquid two-phase jet flow to form macroscopic texture, drying, and integrally roughening the surface of the crystallization roller by adopting solid-gas two-phase jet flow. By the method, the better macroscopic texture can be formed on the surface of the matrix of the crystallization roller, and the bonding area and the bonding strength of a cold spray coating and the matrix of the crystallization roller are increased, so that good conditions are provided for a subsequent cold spray repair working procedure, and the service life of the crystallization roller is prolonged.
Description
Technical field
The present invention relates to the production technique of high tensile steel plate, more particularly, relate to the pretreatment process that a kind of crystallization roller cold spraying is repaired, this method is simple to operation, and speed of cooling is fast and abundant.
Background technology
The continuous casting technology of metal sheet band (plate) has efficiently, low consumption, characteristic cheaply, is the countries in the world man new technology and the novel process of falling over each other to develop in recent years.Wherein, the crystallization roller is one of key part in strip (plate) the continuous casting mechanical means.Its ultimate principle is that molten steel enters the molten bath of being made up of the crystallization roller and the side seal board of two reverse rotations by current distribution device, and liquid metal is frozen at the crystallization roll surface through quick cooling has certain thickness base shell, closes back formation strip (plate) through rolling.Because crystallization roller roll surface directly contacts with molten metal, therefore need have good high-temperature intensity and heat-conductive characteristic, and in this technological process, because casting is finished simultaneously, the crystallization roller not only will bear certain rolling load, also will be subjected to the etch and the wearing and tearing of molten steel, in addition, crystallization roller end face directly contacts with the side seal material, very easily weares and teares.Therefore, improve the wear resistance of crystallization roller and it is repaired cheaply very necessary.
The cold spraying recovery technique is a high efficiency metallurgical instrument recovery technique, also is applied to the reparation to the crystallization roller at present.Its principle is to utilize high pressure gas to carry the metal or alloy particulate to accelerate to more than the supersonic speed by nozzle, make the metal or alloy particle collision of high-speed flight at crystal roller surface to be repaired, dual intense plastic strain by particulate and crystallization roller matrix bonds together, form reparation, thereby realize the reparation of crystallization roller.The advantage that crystallization roller technology is repaired in cold spraying is that the metal or alloy particulate of reparation forms in the solid-state deposit that is lower than its fusing point, and little to the powder particle heat affecting, the coating performance of preparation is identical with feedstock property basically.Yet, because the heat of introducing in the cold spray process is very little, the intense plastic strain that mainly relies on cold spraying particulate and body material that combines of reparation and crystallization roller matrix, realize mechanical snap or local metallurgical binding, therefore, crystallization roller substrate surface state to be repaired is extremely important, and the pattern of surface of good both macro and micro can produce material impact to Bond Strength of Coating and other mechanical property.
At present, before cold spraying, adopt the pretreatment mode that crystallization roller matrix surface is carried out pickling or sandblast texturing usually, make crystallization roller matrix surface form certain roughness, and then carry out the cold spraying reparation.But, because the formed roughness of above-mentioned pretreatment mode is wayward, and coating after the cold spraying and crystallization roller matrix bond area are little, bonding strength is lower, cause the crystallization roller at work because of cold and hot fatigue effect, very easily ftracture, form macrocrack, finally cause the reparation integral body of crystallization roller to come off at coating interface.
Summary of the invention
At the above-mentioned shortcoming that exists in the prior art, the purpose of this invention is to provide the pretreatment process that a kind of crystallization roller cold spraying is repaired, this method helps increasing the bonded area of reparation and crystallization roller matrix in follow-up cold spraying is repaired, and improves bonding force.
For achieving the above object, the present invention adopts following technical scheme:
The concrete steps of the pretreatment process that this crystallization roller cold spraying is repaired are as follows:
A. remove the wearing layer of crystallization roller matrix surface;
B. the crystallization roller is clamped on the rotary table, and driving crystallization roller is rotated;
C. by nozzle highly pressurised liquid is carried polygon corner angle hard particles bombardment on crystallization roller matrix surface, carry out the surface erosion cutting, form the fairshaped superficial makings of nature;
D. utilize the high speed hot gas flow that crystal roller surface is carried out drying treatment;
E. by nozzle high pressure gas are carried the alloy particle bombardment and behind crystallization roller matrix surface, rebound, and form the microcosmic texturing hole of stochastic distribution on the surface.
In steps A, adopt turning, grinding or turning and grinding fit system to remove wearing layer, make that the roughness scope of crystallization roller matrix surface is Ra0.3～3.0 μ m, tapering is less than 0.1mm.
In step B, described crystallization roller speed range is 80～400rpm, and in rotary course, makes crystallization roller matrix surface beat height less than 0.5mm.
In step C, the mixture of one or more in the material selection aluminum oxide of described hard particles, zirconium white, yttrium oxide, boron nitride, silicon-dioxide, silicon nitride, silicon carbide, wolfram varbide, the diamond; The average particle size range of described hard particles is 20～200 μ m, and bombardment density is 2000～5000/cm
2
In step C, described superficial makings is equidistant distribution, and the central depths scope of each texture is 0.3～2mm, and the texture width range is 3～15mm, and the spacing range of adjacent texture is 1～10 times of texture width.
In step D, adopting the temperature range of hot gas flow is 80～400 ℃, and flow is greater than 30m
3/ h.
In step e, the pressure range of described high pressure gas is 0.8～1.8MPa, and temperature range is room temperature～280 ℃.
In step e, the mixture of one or more in the material of described alloy particle employing Chrome metal powder, tungstenalloy, iron alloy, tantalum alloy, the amorphous alloy; The microhardness of alloy particle is greater than Hv350; Particle size range is 10～50 microns.
In step e, the bombardment velocity range of described alloy particle is 80～400m/s, and bombardment density is 3000～30000/cm
2, the scope of the crystallization roller matrix surface roughness after the bombardment texturing is Ra0.8～3.0 μ m.
In technique scheme, the pretreatment process that crystallization roller cold spraying of the present invention is repaired is by removing the wearing layer of crystallization roller matrix surface earlier, rotate the crystallization roller then, adopt the bombardment of solid-liquid two phase jet flow again, cut the macroscopical texture of its surface formation, and then carry out drying, adopt the gas-solid two phase jet flow that whole texturing is carried out on its surface at last.Adopt aforesaid method to form preferable macroscopical texture at crystallization roller matrix surface, the bonded area and the bonding strength of cold spraying coating and crystallization roller matrix have been increased, thereby, thereby prolonged the work-ing life of crystallization roller for follow-up cold spraying reparing process provides good condition.
Description of drawings
Fig. 1 is the schema of the pretreatment process of crystallization roller cold spraying reparation of the present invention;
Fig. 2 be in the method for the present invention nozzle structure iron is set;
Fig. 3 is macroscopical texture distribution schematic diagram of bombardment post crystallization roller upper and lower surface of the present invention;
Fig. 4 is the microscopic appearance SEM photo of texturing post crystallization roller matrix surface of the present invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
See also shown in Figure 1ly, the concrete steps of the pretreatment process that crystallization roller cold spraying of the present invention is repaired are as follows:
A. remove the wearing layer of crystallization roller matrix surface;
B. the crystallization roller is clamped on the rotary table, and driving crystallization roller is rotated;
C. utilize highly pressurised liquid to carry the hard particles of polygon corner angle as driving medium, after the nozzle acceleration, obtain the solid-liquid two phase jet flow of high kinetic energy, and bombardment is at crystallization roller matrix surface, the hard particles little by high energy washes away cutting to crystallization roller matrix surface, obtains the fairshaped superficial makings of nature;
D. utilize the high speed hot gas flow that crystal roller surface is carried out drying treatment;
E. by laval nozzle high pressure gas are carried the alloy particle bombardment and behind crystallization roller matrix surface, rebound, and form the microcosmic texturing hole of stochastic distribution on the surface.
In steps A, adopt turning, grinding or turning and grinding fit system to remove wearing layer, make that the roughness scope of crystallization roller matrix surface is Ra0.3～3.0 μ m, tapering is less than 0.1mm.
In step B, described crystallization roller speed range is 80～400rpm, and the optimum revolution scope is 150～300rpm, and in rotary course, makes crystallization roller matrix surface beat height less than 0.5mm.
In step C, described highly pressurised liquid can adopt water, and pressure range is 5～35MPa; The mixture of one or more in the material selection aluminum oxide of described hard particles, zirconium white, yttrium oxide, boron nitride, silicon-dioxide, silicon nitride, silicon carbide, wolfram varbide, the diamond; The average particle size range of described hard particles is 20～200 μ m, and bombardment density is 2000～5000/cm
2
And the nozzle of employing and crystallization roller matrix surface distance are 10～100mm, and the spray beam spot diameter is 3～15mm, and best beam spot diameter, is 6～10mm; Its spray angle as shown in Figure 2, angular range is-90 °≤a≤90 °, best spray angle scope is-30 °≤a≤30 °.
Please in conjunction with shown in Figure 3, be equidistant distribution by the crystallization roller matrix surface texture after the step C bombardment, the central depths scope of each texture is 0.3～2mm, and best depth range is 0.8～1.2mm; The texture width range is 3～15mm, best width range 6～10mm, and the spacing range of adjacent texture is 1～10 times of texture width, best spacing is 4～6 times of texture width.
In step D, adopting the temperature range of hot gas flow is 80～400 ℃, and flow is greater than 30m
3/ h carries out surface drying to be handled.
In step e, described high pressure gas can adopt one or more the mixed gas in nitrogen, argon gas, helium, the pressurized air, and also can adopt is the mixed gas that any one gas in nitrogen, argon gas, the helium and hydrogen are formed with 99: 1 ratio; The pressure range of this gas is 0.8～1.8MPa, and best pressure range is 1.0～1.5MPa; Temperature range is room temperature～280 ℃, and optimum range is 150～200 ℃.
In step e, the mixture of one or more in the material of described alloy particle employing Chrome metal powder, tungstenalloy, iron alloy, tantalum alloy, the amorphous alloy; The microhardness of alloy particle is greater than Hv350, and best durometer level is Hv500～700; Alloy particle is shaped as sphere or almost spherical, and its particle size range is 10～50 microns, and the optimum grain-diameter scope is 20～30 microns.
And the bombardment velocity range of described alloy particle is 80～400m/s, and best bombardment velocity range is 260～340m/s; Bombardment density is 3000～30000/cm
2, the crystallization roller matrix surface of bombardment after the texturing as shown in Figure 4, the scope of surfaceness is Ra0.8～3.0 μ m.
Below method of the present invention is specifically illustrated:
Embodiment 1
Crystallization roller body material to be repaired is a beraloy, removes wearing layer by surperficial turning earlier, and the surfaceness of gained is Ra1.2 after the turning, and tapering is 0.08mm; Then crystallization roller matrix is clamped on the rotary table and rotates, speed of rotation is 200rpm, and the crystallization roller is beated and is 0.2mm; Jet exit and crystal roller surface distance is set to 20mm again, and the spray beam spot diameter is elected 8mm as, and bombardment angle a is 5 °, and bombardment density is 3000/cm
2, the high pressure water driving median size of utilizing 25MPa is that 120 microns alumina particle bombards at crystal roller surface, prepares equidistant macroscopical texture, and the texture width of gained is 12mm, and adjacent texture spacing is 16mm, and the texture central depths is 1mm; And then utilize 200 ℃, flow to be 35m
3The high speed nitrogen gas stream of/h dries up the surface; Adopting median size at last is that 25 μ m, microhardness are the spherical stainless steel particulate of Hv380, is that 1.5MPa, temperature are that 250 ℃ nitrogen drives the back and carries out surperficial whole texturing with the bombardment speed of 240m/s by pressure, and the gained surfaceness is Ra1.8 μ m.The crystallization roller matrix surface of handling with this method carries out follow-up cold spraying copper alloy reparation, and its effect is compared with traditional way, and bonded area increases more than 10%, and bonding strength improves more than 20%.
Embodiment 2
Crystallization roller body material to be repaired is the 20CrMo steel, removes wearing layer by surfacing earlier, and the surfaceness of mill back gained is Ra0.4, and tapering is 0.05mm; Then crystallization roller matrix is clamped on the rotary table and rotates, speed of rotation is 300rpm, and the crystallization roller is beated and is 0.3mm; Jet exit and crystal roller surface distance is set to 25mm again, and the spray beam spot diameter is elected 12mm as, and bombardment angle a is 0 °, and bombardment density is 2500/cm
2, the high pressure water driving median size of utilizing 25MPa is that 150 microns alumina particle bombards at crystal roller surface, prepares equidistant macroscopical texture, and the texture width of gained is 13.5mm, and adjacent texture spacing is 60mm, and the texture central depths is 1.5mm; And then utilize 230 ℃, flow to be 42m
3The high speed nitrogen gas stream of/h dries up the surface; Adopting median size at last is that 23 μ m, microhardness are the spherical tungstenalloy particulate of Hv680, is that 1.8MPa, temperature are that 280 ℃ nitrogen drives the back and carries out surperficial whole texturing with the bombardment speed of 380m/s by pressure, and the gained surfaceness is Ra1.6 μ m.The crystallization roller matrix surface of handling with this method carries out follow-up cold spraying copper alloy reparation, and its effect is compared with traditional way, and bonded area increases more than 15%, and bonding strength improves more than 23%.
Embodiment 3
Crystallization roller body material to be repaired is a chrome zirconium copper alloy, removes wearing layer by surperficial turning earlier, and the surfaceness of gained is Ra1.8 after the turning, and tapering is 0.63mm, and the crystallization roll surface is beated and is 0.25mm; Then crystallization roller matrix is clamped on the rotary table and rotates, speed of rotation is 280rpm; Jet exit and crystal roller surface distance is set to 33mm again, and the spray beam spot diameter is elected 10mm as, and bombardment angle a is 20 °, and bombardment density is 4300/cm
2, the high pressure water driving median size of utilizing 25MPa is that 55 microns alumina particle bombards at crystal roller surface, prepares equidistant macroscopical texture, and the texture width of gained is 9mm, and adjacent texture spacing is 36mm, and the texture central depths is 1.1mm; And then utilize 130 ℃, flow to be 48m
3The high speed nitrogen gas stream of/h dries up the surface; Adopting median size at last is that 35 μ m, microhardness are the spherical Cr alloy particle of Hv530, is that 1.6MPa, temperature are that 270 ℃ nitrogen drives the back and carries out surperficial whole texturing with the bombardment speed of 305m/s by pressure, and the gained surfaceness is Ra2.4 μ m.The crystallization roller matrix surface of handling with this method carries out follow-up cold spraying copper alloy reparation, and its effect is compared with traditional way, and bonded area increases more than 18%, and bonding strength improves more than 30%.
In sum, adopt pretreatment process of the present invention, can have following significant advantage:
1, made full use of that the high pressure liquid drives hard particles washes away, the similarity on Machining Technology for Cutting and the cold spray technique hydromeehanics, adopt the resulting texture of the technology of the present invention, be fit to follow-up cold spraying repair layer deposition;
Macroscopical texture of the crystallization roller matrix surface that 2, obtains, can increase the bonded area between coating and the matrix, coating and high base strength improve more than 10%, thermal conductivity improves more than 5%, make the cold and hot fatigue property of tolerance significantly improve, thereby improve the over-all properties of repair layer greatly;
3, adopt alloy particle to carry out the integral surface texturing, can obtain and the similar microcosmic texturing pattern in cold spraying particulate distortion back, help the deposition of follow-up cold spraying particulate more.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (9)
1. the pretreatment process that the cold spraying of crystallization roller is repaired is characterized in that,
The concrete steps of this method are as follows:
A. remove the wearing layer of crystallization roller matrix surface;
B. the crystallization roller is clamped on the rotary table, and driving crystallization roller is rotated;
C. by nozzle highly pressurised liquid is carried polygon corner angle hard particles bombardment on crystallization roller matrix surface, carry out the surface erosion cutting, form the fairshaped superficial makings of nature;
D. utilize the high speed hot gas flow that crystal roller surface is carried out drying treatment;
E. by nozzle high pressure gas are carried the alloy particle bombardment and behind crystallization roller matrix surface, rebound, and form the microcosmic texturing hole of stochastic distribution on the surface.
2. the pretreatment process that crystallization roller cold spraying as claimed in claim 1 is repaired is characterized in that,
In steps A, adopt turning, grinding or turning and grinding fit system to remove wearing layer, make that the roughness scope of crystallization roller matrix surface is Ra0.3～3.0 μ m, tapering is less than 0.1mm.
3. the pretreatment process that crystallization roller cold spraying as claimed in claim 1 is repaired is characterized in that,
In step B, described crystallization roller speed range is 80～400rpm, and in rotary course, makes crystallization roller matrix surface beat height less than 0.5mm.
4. the pretreatment process that crystallization roller cold spraying as claimed in claim 1 is repaired is characterized in that:
In step C, the mixture of one or more in the material selection aluminum oxide of described hard particles, zirconium white, yttrium oxide, boron nitride, silicon-dioxide, silicon nitride, silicon carbide, wolfram varbide, the diamond; The average particle size range of described hard particles is 20～200 μ m, and bombardment density is 2000～5000/cm
2
5. the pretreatment process that crystallization roller cold spraying as claimed in claim 1 is repaired is characterized in that:
In step C, described superficial makings is equidistant distribution, and the central depths scope of each texture is 0.3～2mm, and the texture width range is 3～15mm, and the spacing range of adjacent texture is 1～10 times of texture width.
6. the pretreatment process that crystallization roller cold spraying as claimed in claim 1 is repaired is characterized in that:
In step D, adopting the temperature range of hot gas flow is 80～400 ℃, and flow is greater than 30m
3/ h.
7. the pretreatment process that crystallization roller cold spraying as claimed in claim 1 is repaired is characterized in that:
In step e, the pressure range of described high pressure gas is 0.8～1.8MPa, and temperature range is room temperature～280 ℃.
8. the pretreatment process that crystallization roller cold spraying as claimed in claim 1 is repaired is characterized in that:
In step e, the mixture of one or more in the material of described alloy particle employing Chrome metal powder, tungstenalloy, iron alloy, tantalum alloy, the amorphous alloy; The microhardness of alloy particle is greater than Hv350; Particle size range is 10～50 microns.
9. the pretreatment process that crystallization roller cold spraying as claimed in claim 1 is repaired is characterized in that:
In step e, the bombardment velocity range of described alloy particle is 80～400m/s, and bombardment density is 3000～30000/cm
2, the scope of the crystallization roller matrix surface roughness after the bombardment texturing is Ra0.8～3.0 μ m.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103045987A (en) * | 2012-12-19 | 2013-04-17 | 四川成发航空科技股份有限公司 | Method for carrying out thermal spraying on profiles of narrow and deep groove with multiple spraying region surfaces |
| CN104002202A (en) * | 2014-05-30 | 2014-08-27 | 宝山钢铁股份有限公司 | Production method of high-cleanliness and defect-free roughened surface of thin belt continuous casting crystallization roller |
| CN104178761A (en) * | 2013-05-20 | 2014-12-03 | 宝山钢铁股份有限公司 | Crystallization roller surface taper hole defect online recovery method |
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| US20060121183A1 (en) * | 2004-12-03 | 2006-06-08 | United Technologies Corporation | Superalloy repair using cold spray |
| CN101045258A (en) * | 2006-03-29 | 2007-10-03 | 宝山钢铁股份有限公司 | On-line controlling method for form of texture on surface of thin band continuous casting crystallization roller |
| CN101333637A (en) * | 2007-06-25 | 2008-12-31 | 宝山钢铁股份有限公司 | Process for repairing continuous casting crystal roller |
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2010
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060121183A1 (en) * | 2004-12-03 | 2006-06-08 | United Technologies Corporation | Superalloy repair using cold spray |
| JP2006161160A (en) * | 2004-12-03 | 2006-06-22 | United Technol Corp <Utc> | Superalloy repair using cold spray |
| CN101045258A (en) * | 2006-03-29 | 2007-10-03 | 宝山钢铁股份有限公司 | On-line controlling method for form of texture on surface of thin band continuous casting crystallization roller |
| CN101333637A (en) * | 2007-06-25 | 2008-12-31 | 宝山钢铁股份有限公司 | Process for repairing continuous casting crystal roller |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103045987A (en) * | 2012-12-19 | 2013-04-17 | 四川成发航空科技股份有限公司 | Method for carrying out thermal spraying on profiles of narrow and deep groove with multiple spraying region surfaces |
| CN103045987B (en) * | 2012-12-19 | 2015-11-18 | 四川成发航空科技股份有限公司 | For there being the narrow deep trouth profile heat spraying method in multiple spraying area face |
| CN104178761A (en) * | 2013-05-20 | 2014-12-03 | 宝山钢铁股份有限公司 | Crystallization roller surface taper hole defect online recovery method |
| CN104002202A (en) * | 2014-05-30 | 2014-08-27 | 宝山钢铁股份有限公司 | Production method of high-cleanliness and defect-free roughened surface of thin belt continuous casting crystallization roller |
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