CN117070874A - Preparation method of wear-resistant layer for leveling roller and leveling roller using same - Google Patents
Preparation method of wear-resistant layer for leveling roller and leveling roller using same Download PDFInfo
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- CN117070874A CN117070874A CN202311053841.4A CN202311053841A CN117070874A CN 117070874 A CN117070874 A CN 117070874A CN 202311053841 A CN202311053841 A CN 202311053841A CN 117070874 A CN117070874 A CN 117070874A
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- roller
- tungsten carbide
- wear
- leveling
- resistant layer
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- 238000002360 preparation method Methods 0.000 title abstract description 10
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000011248 coating agent Substances 0.000 claims abstract description 28
- 238000000576 coating method Methods 0.000 claims abstract description 28
- 238000005488 sandblasting Methods 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 27
- 238000005507 spraying Methods 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000010285 flame spraying Methods 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 11
- 238000005498 polishing Methods 0.000 claims abstract description 8
- 239000012459 cleaning agent Substances 0.000 claims abstract description 6
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 6
- 239000010432 diamond Substances 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000003746 surface roughness Effects 0.000 claims description 20
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 239000011651 chromium Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000010941 cobalt Substances 0.000 claims description 4
- 229910017052 cobalt Inorganic materials 0.000 claims description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 4
- 239000003350 kerosene Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 239000010937 tungsten Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 46
- 238000007747 plating Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention relates to steel processing equipment, and discloses a preparation method of a wear-resistant layer for a leveling roller and the leveling roller using the same, wherein the preparation of the wear-resistant layer comprises the following steps: s1) removing oil stains on the roller surface of a leveling roller by using an alkaline cleaning agent, washing the roller surface by using clear water, heating the roller surface by using a flame gun, and performing sand blasting treatment on the roller surface by using a sand blaster; s2) heating the roller surface by using a flame gun and keeping the temperature constant; s3) adopting supersonic flame spraying equipment to heat the tungsten carbide powder to a semi-molten state, and then spraying the tungsten carbide powder on the roller surface at a spraying speed of three times of sonic speed to form a tungsten carbide coating; s4) polishing the surface of the tungsten carbide coating by using a diamond grinding wheel, and then carrying out sand blasting treatment to obtain the required roughness of the surface of the tungsten carbide coating, thus obtaining the wear-resistant layer. The leveling roller has the characteristic of leveling the cold-rolled sheet and forming a rough surface on the surface of the cold-rolled sheet, so that the cost of secondary processing of the cold-rolled sheet can be saved.
Description
Technical Field
The invention relates to the technical field of steel processing equipment, in particular to a preparation method of a wear-resistant layer for a leveling roller and the leveling roller using the same.
Background
In the prior art, a cold rolled coil stock is divided into cold rolled sheets by a rolling mill, and local curling or moire appears at the edge part and the middle part of the cold rolled sheets after the division, so that the cold rolled sheets need to be stretched and finished by a straightener to restore the flat surfaces of the cold rolled sheets.
The thickness of the cold-rolled sheet after being flattened by a straightener with the linear speed of 500-1000m/min is reduced by 0.01-0.03mm.
In order to improve the adhesion of the sprayed layer to the surface of the cold-rolled sheet, the surface of the cold-rolled sheet needs to be treated to a rough surface with a roughness Ra of > 3.0 μm.
If the surface of the cold-rolled sheet is roughened by using a roll stamping method, the thickness of the cold-rolled sheet after stamping is further reduced, resulting in a non-standard thickness of the cold-rolled sheet.
Disclosure of Invention
In view of the above-mentioned drawbacks, a first object of the present invention is to propose a method for producing a wear-resistant layer for a leveling roller, which coats the roller surface of the leveling roller with the wear-resistant layer and which can obtain a desired roughness of the surface of a cold-rolled sheet by rolling of the leveling roller through the wear-resistant layer.
Further, a second object of the present invention is to provide a leveling roller coated with a wear-resistant layer on the surface, which has the advantages of rolling and leveling the cold-rolled sheet after slitting, and forming a rough surface on the surface of the rolled cold-rolled sheet, so that the cost of secondary processing of the cold-rolled sheet can be saved.
To achieve the purpose, the invention adopts the following technical scheme:
a method for producing a wear-resistant layer of a leveling roller for a leveler to roll and level a cold-rolled sheet after slitting, the surface of the rolled cold-rolled sheet forming a rough surface, the production of the wear-resistant layer comprising the steps of:
s1) removing oil stains on the roller surface of the leveling roller by using an alkaline cleaning agent, washing the roller surface by using clear water, heating the roller surface by using a flame gun, and performing sand blasting treatment on the roller surface by using a sand blaster;
s2) heating the roller surface to 90-95 ℃ by using a flame gun, and keeping the temperature constant for 20-30min;
s3) heating the tungsten carbide powder to a semi-molten state by adopting supersonic flame spraying equipment, then spraying the semi-molten tungsten carbide powder on the roller surface at a spraying speed of three times of sonic speed, and forming a tungsten carbide coating on the roller surface;
and S4) polishing the surface of the tungsten carbide coating by using a diamond grinding wheel, and then carrying out sand blasting treatment on the tungsten carbide coating by using a sand blaster to ensure that the surface roughness Ra of the tungsten carbide coating reaches more than 3.2 mu m, thus obtaining the wear-resistant layer.
Preferably, in the step S1), the temperature of the roller surface heated by the flame gun is 40-50 ℃; the surface roughness Ra of the roll surface after sand blasting is 6-8 mu m.
Specifically, in step S3), the tungsten carbide powder is composed of 9.96% cobalt, 3.50% chromium, 5.20% carbon powder and 81.49% tungsten by weight.
Specifically, in step S3), the spray distance of the supersonic flame spraying is 380mm, the gun speed is 35mm/sec, the powder feeding amount is 85g/min, the powder carrying nitrogen flow is 10L/min, the kerosene flow is 25L/h, and the oxygen flow is 900L/h.
Further, in the step S4), the thickness of the tungsten carbide spraying layer is 0.12-0.2mm, and the surface roughness Ra of the tungsten carbide coating layer is 3.2-4.0 mu m.
Further, the invention provides a leveling roller, the surface of which is coated with a wear-resistant layer, and the wear-resistant layer is prepared by the preparation method of the wear-resistant layer for the leveling roller.
The technical scheme of the invention has the beneficial effects that: according to the preparation method of the wear-resistant layer for the leveling roller, the oil stains on the roller surface of the leveling roller are cleaned through the step S1), the surface is roughened by sand blasting, the moisture in the roller of the leveling roller is completely volatilized through the heating of the step S2), the interface temperature of the roller surface is improved, the cracking or falling-off phenomenon of the coating between the roller body and the tungsten carbide coating due to the difference of thermal expansion coefficients is reduced, and therefore the bonding strength of tungsten carbide powder particles and the roller surface during supersonic flame spraying is improved, and the adhesive force and the service life of the wear-resistant layer are improved; then the surface roughness Ra of the tungsten carbide coating reaches more than 3.2 mu m through sand blasting, and then the leveling roller has the characteristic of rolling and leveling the cold-rolled sheet and simultaneously forming a rough surface with the roughness Ra of more than 3.0 mu m on the surface of the cold-rolled sheet, so that the cost of secondary processing of the cold-rolled sheet can be saved, and the phenomenon of thickness loss of the cold-rolled sheet caused by secondary processing is avoided.
Furthermore, the leveling roller provided by the invention can grind and level the cold-rolled sheet after slitting, and can enable the surface of the rolled cold-rolled sheet to form a rough surface with the roughness Ra of more than 3.0 mu m, so that the cost of secondary processing of the cold-rolled sheet can be saved, and the phenomenon of thickness loss of the cold-rolled sheet caused by secondary processing can be avoided.
Detailed Description
The technical scheme of the invention is further described below with reference to the specific embodiments.
In the description herein, reference to the term "embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
A method for producing a wear-resistant layer of a leveling roller for a leveler to roll and level a cold-rolled sheet after slitting, the surface of the rolled cold-rolled sheet forming a rough surface, the production of the wear-resistant layer comprising the steps of:
s1) removing oil stains on the roller surface of the leveling roller by using an alkaline cleaning agent, washing the roller surface by using clear water, heating the roller surface by using a flame gun, and performing sand blasting treatment on the roller surface by using a sand blaster;
s2) heating the roller surface to 90-95 ℃ by using a flame gun, and keeping the temperature constant for 20-30min;
s3) heating the tungsten carbide powder to a semi-molten state by adopting supersonic flame spraying equipment, then spraying the semi-molten tungsten carbide powder on the roller surface at a spraying speed of three times of sonic speed, and forming a tungsten carbide coating on the roller surface;
and S4) polishing the surface of the tungsten carbide coating by using a diamond grinding wheel, and then carrying out sand blasting treatment on the tungsten carbide coating by using a sand blaster to ensure that the surface roughness Ra of the tungsten carbide coating reaches more than 3.2 mu m, thus obtaining the wear-resistant layer.
According to the preparation method of the wear-resistant layer for the leveling roller, disclosed by the invention, the oil stains on the roller surface of the leveling roller are cleaned through the step S1), the surface is roughened by sand blasting, the moisture in the roller of the leveling roller is completely volatilized through the heating of the step S2), the interface temperature of the roller surface is increased, the cracking or falling-off phenomenon of the coating between the roller body and the tungsten carbide coating due to the difference of thermal expansion coefficients is reduced, so that the bonding strength of tungsten carbide powder particles and the roller surface during supersonic flame spraying is improved, and the adhesive force and the service life of the wear-resistant layer are improved; then the surface roughness Ra of the tungsten carbide coating reaches more than 3.2 mu m through sand blasting, and then the leveling roller has the characteristic of rolling and leveling the cold-rolled sheet and simultaneously forming a rough surface with the roughness Ra of more than 3.0 mu m on the surface of the cold-rolled sheet, so that the cost of secondary processing of the cold-rolled sheet can be saved, and the phenomenon of thickness loss of the cold-rolled sheet caused by secondary processing is avoided.
Preferably, in the step S1), the temperature of the roller surface heated by the flame gun is 40-50 ℃; the surface roughness Ra of the roll surface after sand blasting is 6-8 mu m.
The temperature of the roller surface heated by the flame gun is 40-50 ℃ so that residual oil stains in the leveling roller completely seep out, then sand blasting is performed to clear the seeped oil stains, and the roller surface is roughened, so that the bonding strength of tungsten carbide powder particles and the roller surface during supersonic flame spraying is improved, and the adhesive force and the service life of the wear-resistant layer are further improved.
Specifically, in step S3), the tungsten carbide powder is composed of 9.96% cobalt, 3.50% chromium, 5.20% carbon powder and 81.49% tungsten by weight.
The tungsten carbide powder prepared according to the proportion is sprayed by adopting supersonic flame so as to form the tungsten carbide spray coating with the hardness more than 1200HV on the surface of the leveling roller.
Specifically, in step S3), the spray distance of the supersonic flame spraying is 380mm, the gun speed is 35mm/sec, the powder feeding amount is 85g/min, the powder carrying nitrogen flow is 10L/min, the kerosene flow is 25L/h, and the oxygen flow is 900L/h.
By controlling the process of supersonic flame spraying according to the parameters, the compactness of the prepared tungsten carbide spray coating can be ensured, and further the hardness HV of the prepared tungsten carbide spray coating is ensured to be more than 1200.
Further, in the step S4), the thickness of the tungsten carbide spraying layer is 0.12-0.2mm, and the surface roughness Ra of the tungsten carbide coating layer is 3.2-4.0 mu m.
When the surface of the tungsten carbide spraying layer is worn and the roughness Ra is less than 3.0 mu m, the leveling roller loses the effect of enabling the rolled cold-rolled sheet to obtain a rough surface with the roughness Ra more than 3.0 mu m, and the surface roughness Ra of the tungsten carbide spraying layer can reach the requirement of more than or equal to 3.2 mu m again through polishing and sand blasting, and the thickness loss of the tungsten carbide spraying layer is 0.05mm after each polishing and sand blasting treatment. Therefore, the wear-resistant layer with the thickness of 0.12-0.2mm can enable the leveling roller to have the performance of 2-3 times of repolishing and sand blasting processing, so that the frequency of spraying the wear-resistant layer on the roller surface of the leveling roller can be reduced, and the running efficiency of the leveling roller is improved.
Further, the invention provides a leveling roller, the surface of which is coated with a wear-resistant layer, and the wear-resistant layer is prepared by the preparation method of the wear-resistant layer for the leveling roller.
The prepared leveling roller with the surface coated with the wear-resistant layer can grind and level the cold-rolled sheet after slitting, and can enable the surface of the rolled cold-rolled sheet to form a rough surface with the roughness Ra of more than 3.0 mu m, so that the cost of secondary processing of the cold-rolled sheet can be saved, and the phenomenon of thickness loss of the cold-rolled sheet caused by secondary processing can be avoided.
Example 1 and comparative example 1
1. The surface of the leveling roll of example 1 was coated with a wear layer, which was prepared as follows:
s1) removing oil stains on the roller surface of the leveling roller by using an alkaline cleaning agent, washing the roller surface by using clear water, heating the roller surface by using a flame gun, and performing sand blasting treatment on the roller surface by using a sand blaster;
s2) heating the roller surface to 90-95 ℃ by using a flame gun, and keeping the temperature constant for 20-30min;
s3) heating the tungsten carbide powder to a semi-molten state by adopting supersonic flame spraying equipment, then spraying the semi-molten tungsten carbide powder on the roller surface at a spraying speed of three times of sonic speed, and forming a tungsten carbide coating on the roller surface;
s4) polishing the surface of the tungsten carbide coating by using a diamond grinding wheel, and then carrying out sand blasting treatment on the tungsten carbide coating by using a sand blaster to ensure that the surface roughness Ra of the tungsten carbide coating reaches more than 3.2 mu m, thereby obtaining the leveling roller with the surface coated with the wear-resistant layer in the embodiment 1.
In the step S1), the temperature of the roller surface heated by the flame gun is 40-50 ℃; the surface roughness Ra of the roller surface after sand blasting is 6-8 mu m;
in the step S3), the tungsten carbide powder consists of 9.96 percent of metallic cobalt, 3.50 percent of metallic chromium, 5.20 percent of carbon powder and 81.49 percent of metallic tungsten according to weight percentage;
in the step S3), the spraying distance of the supersonic flame spraying is 380mm, the gun speed is 35mm/sec, the powder feeding amount is 85g/min, the powder carrying nitrogen flow is 10L/min, the kerosene flow is 25L/h, and the oxygen flow is 900L/h;
in the step S4), the hardness of the tungsten carbide spraying layer is more than 1200HV, the thickness of the tungsten carbide spraying layer is 0.15mm, and the surface roughness Ra of the tungsten carbide coating layer is 3.2 mu m.
2. The surface of the leveling roll of comparative example 1 was covered with a hard chrome plating layer, which was prepared as follows:
t1) removing oil stains on the roller surface of the leveling roller by using an alkaline cleaning agent, washing the roller surface by using clear water, heating the roller surface by using a flame gun, and performing sand blasting treatment on the roller surface by using a sand blaster;
t2) heating the roller surface to 90-95 ℃ by using a flame gun, and keeping the temperature constant for 20-30min;
t3) plating hard chrome on the roller surface of the leveling roller by adopting a hard chrome plating process, and forming a hard chrome plating layer on the roller surface;
t4) polishing the surface of the hard chrome plating layer by using a diamond grinding wheel, and then carrying out sand blasting treatment on the hard chrome plating layer by using a sand blaster to ensure that the surface roughness Ra of the hard chrome plating layer reaches more than 3.2 mu m, thus obtaining the leveling roller with the hard chrome plating layer on the surface of the comparative example 1.
In the step T1), the temperature of the roller surface heated by the flame gun is 40-50 ℃; the surface roughness Ra of the roller surface after sand blasting is 6-8 mu m;
in the step T4), the hardness of the hard chromium plating layer is 800-900HV, the thickness is 0.15mm, and the surface roughness Ra of the hard chromium plating layer is 3.2 mu m.
3. The leveling rolls of example 1 and the leveling rolls of comparative example 1 were used for the leveler, respectively, and cold-rolled sheets having a thickness of 0.5mm were rolled at an operation speed of 1000m/min, respectively, and then, when the rolled cold-rolled sheets were subjected to surface roughness Ra < 3.0 μm, respectively, the acceptable lengths of the cold-rolled sheets rolled by the leveling rolls of example 1 and the leveling rolls of comparative example 1 were detected and recorded, respectively.
The detection results are as follows:
3.1 the pass length of the cold rolled sheet finished with the flattening roll of example 1 was set and sandblasted to coarsen the table 10084km;
3.2 the pass length of the flat roll of comparative example 1 to finish the rolled cold rolled sheet was set and the table was roughened 1504km by sand blasting.
In summary, according to the preparation method of the wear-resistant layer for the leveling roller, disclosed by the invention, the oil stains on the roller surface of the leveling roller are cleaned through the step S1), the surface is roughened by sand blasting, the moisture in the roller of the leveling roller is completely volatilized through the heating of the step S2), the interface temperature of the roller surface is improved, the cracking or falling phenomenon of the coating caused by the difference of the thermal expansion coefficients between the roller body and the tungsten carbide coating is reduced, and therefore, the bonding strength of tungsten carbide powder particles and the roller surface during supersonic flame spraying is improved, and the adhesive force and the service life of the wear-resistant layer are improved; then the surface roughness Ra of the tungsten carbide coating reaches more than 3.2 mu m through sand blasting, and then the leveling roller has the characteristic of rolling and leveling the cold-rolled sheet and simultaneously forming a rough surface with the roughness Ra of more than 3.0 mu m on the surface of the cold-rolled sheet, so that the cost of secondary processing of the cold-rolled sheet can be saved, and the phenomenon of thickness loss of the cold-rolled sheet caused by secondary processing is avoided.
Furthermore, the leveling roller provided by the invention can grind and level the cold-rolled sheet after slitting, and can enable the surface of the rolled cold-rolled sheet to form a rough surface with the roughness Ra of more than 3.0 mu m, so that the cost of secondary processing of the cold-rolled sheet can be saved, and the phenomenon of thickness loss of the cold-rolled sheet caused by secondary processing can be avoided.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (6)
1. A method for producing a wear-resistant layer of a leveling roller for a leveler to roll and level a cold-rolled sheet after slitting, the surface of the rolled cold-rolled sheet forming a rough surface, characterized in that the production of the wear-resistant layer comprises the steps of:
s1) removing oil stains on the roller surface of the leveling roller by using an alkaline cleaning agent, washing the roller surface by using clear water, heating the roller surface by using a flame gun, and performing sand blasting treatment on the roller surface by using a sand blaster;
s2) heating the roller surface to 90-95 ℃ by using a flame gun, and keeping the temperature constant for 20-30min;
s3) heating the tungsten carbide powder to a semi-molten state by adopting supersonic flame spraying equipment, then spraying the semi-molten tungsten carbide powder on the roller surface at a spraying speed of three times of sonic speed, and forming a tungsten carbide coating on the roller surface;
and S4) polishing the surface of the tungsten carbide coating by using a diamond grinding wheel, and then carrying out sand blasting treatment on the tungsten carbide coating by using a sand blaster to ensure that the surface roughness Ra of the tungsten carbide coating reaches more than 3.2 mu m, thus obtaining the wear-resistant layer.
2. The method for producing a wear-resistant layer for leveling rolls according to claim 1, wherein in step S1), the temperature of the roll surface heated by the flame gun is 40 to 50 ℃; the surface roughness Ra of the roll surface after sand blasting is 6-8 mu m.
3. The method for producing a wear-resistant layer for leveling rolls according to claim 1, wherein in step S3), the tungsten carbide powder is composed of 9.96% cobalt, 3.50% chromium, 5.20% carbon powder and 81.49% tungsten in weight percent.
4. The method for producing a wear-resistant layer for leveling rolls according to claim 1, wherein in step S3), the spray distance of the supersonic flame spraying is 380mm, the gun speed is 35mm/sec, the powder feeding amount is 85g/min, the powder carrying nitrogen flow is 10L/min, the kerosene flow is 25L/h, and the oxygen flow is 900L/h.
5. The method for producing a wear-resistant layer for leveling rolls according to claim 1, wherein in step S4), the thickness of the tungsten carbide sprayed layer is 0.12-0.2mm, and the surface roughness Ra of the tungsten carbide sprayed layer is 3.2-4.0 μm.
6. A leveling roll, characterized in that the surface of the leveling roll is coated with a wear layer, which is produced using the production method for a wear layer of a leveling roll according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311053841.4A CN117070874A (en) | 2023-08-21 | 2023-08-21 | Preparation method of wear-resistant layer for leveling roller and leveling roller using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311053841.4A CN117070874A (en) | 2023-08-21 | 2023-08-21 | Preparation method of wear-resistant layer for leveling roller and leveling roller using same |
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| CN117070874A true CN117070874A (en) | 2023-11-17 |
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| CN202311053841.4A Pending CN117070874A (en) | 2023-08-21 | 2023-08-21 | Preparation method of wear-resistant layer for leveling roller and leveling roller using same |
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| CN (1) | CN117070874A (en) |
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