CN115161634A - Mo3A cold roll surface graphite laser cladding coating method - Google Patents
Mo3A cold roll surface graphite laser cladding coating method Download PDFInfo
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- CN115161634A CN115161634A CN202210823066.5A CN202210823066A CN115161634A CN 115161634 A CN115161634 A CN 115161634A CN 202210823066 A CN202210823066 A CN 202210823066A CN 115161634 A CN115161634 A CN 115161634A
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- mo3a
- powder
- cold roll
- laser cladding
- graphite
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- 238000004372 laser cladding Methods 0.000 title claims abstract description 41
- 238000000576 coating method Methods 0.000 title claims abstract description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 20
- 239000010439 graphite Substances 0.000 title claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 45
- 239000011248 coating agent Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 239000011812 mixed powder Substances 0.000 claims abstract description 9
- 238000005498 polishing Methods 0.000 claims description 16
- 230000007547 defect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 238000003754 machining Methods 0.000 claims description 8
- 238000005488 sandblasting Methods 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims 3
- 239000010410 layer Substances 0.000 description 7
- 238000005253 cladding Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- 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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a laser cladding coating method for graphite on the surface of a Mo3A cold roll, and relates to a roll surface repairing method. The laser cladding coating comprises 20-30 wt% of Fe powder, 25-35 wt% of Cr powder, 5-25 wt% of Ni powder and 20-50 wt% of Ni-coated graphite powder, and the surface of a Mo3A cold roll is strengthened and repaired by the coaxial powder feeding laser cladding technology through the mixed powder. The graphite laser cladding coating prepared by the invention can improve the frictional wear performance of the Mo3A cold roll and prolong the service cycle of the cold roll.
Description
Technical Field
The invention relates to a roller surface repairing method, in particular to a method for coating graphite on the surface of a Mo3A cold roller by laser cladding.
Background
The cold roll bears great rolling pressure in the working process, and the problems of welding seams, inclusion, edge cracks and the like of a rolled piece are solved, so that the service life of the cold roll is shortened. Therefore, the cold roll is required to have resistance to cracking and peeling caused by bending, torsion and shear stress, and the depth of a hardened layer of the cold roll is increased in order to reduce the consumption of re-hardening. The laser cladding technology is developed, a material is researched and designed through the laser cladding technology, a material coating with excellent wear resistance and corrosion resistance is prepared, the performance and service life of the repaired cold roll are far higher than those of the original cold roll, the resource-saving and environment-friendly social inevitable trend is formed, and meanwhile, the material for laser cladding surface repair aiming at the specific roll has important practical significance. The laser cladding has the advantages of high material utilization rate, high speed, environmental protection, less structural defects of a deposition layer, finer structure and the like in the production process.
When the existing cold roll is used, the roll is subjected to fatigue stress and thermal cycle, so that severe fatigue wear and thermal fatigue crack are generated to cause scrapping.
Disclosure of Invention
The invention aims to provide a method for laser cladding of graphite on the surface of a Mo3A cold roll, which increases the surface hardness of the Mo3A cold roll, can effectively prolong the service life of the roll and achieve the aim of repairing; the method has simple process, safe and controllable process, no generation of toxic and harmful substances, no environmental pollution and contribution to realizing industrial production.
The purpose of the invention is realized by the following technical scheme:
a Mo3A cold roll surface graphite laser cladding coating method comprises the following processes:
1) Carrying out sand blasting treatment on the surface of the Mo3A cold roll to remove an oxide film and oil stains;
2) Conveying the mixed powder of 20-30 wt% of Fe powder, 25-35 wt% of Cr powder, 5-25 wt% of Ni powder and 20-50 wt% of Ni-coated graphite powder to the surface of a Mo3A cold roll by using a coaxial powder conveying device, wherein the powder conveying speed is 1-10 mm/min, and the offset angle is 5-30 degrees; adopts laser cladding technology to regulate and control technological parametersRepairing the line surface; the laser power of the process is 5200 to 6000 kW, and the power density of a laser is 100 to 667W/mm 2 The scanning speed is 200 to 290 mm/s, and the area of the light spot is 50 to 100 mm 2 The thickness of the coating prepared is 0.9 to 1.8 mm.
3) Machining and polishing the surface of the Mo3A cold roll by using an automatic mechanical polishing machine until the surface of the Mo3A cold roll meets the use precision requirement, and obtaining a surface coating with excellent performance;
4) And (4) carrying out flaw detection on the laser cladding coating, and checking whether defects such as pits exist or not.
In the laser cladding coating method for the graphite on the surface of the Mo3A cold roll, the granularity of the Fe powder is 30-120 mu m.
In the laser cladding coating method for the graphite on the surface of the Mo3A cold roll, the granularity of the Cr powder is 40-100 mu m.
In the laser cladding coating method for the graphite on the surface of the Mo3A cold roll, the granularity of the Ni powder is 25-110 mu m.
In the laser cladding coating method for the graphite on the surface of the Mo3A cold roll, the granularity of the Ni-coated graphite powder is 20-90 mu m.
According to the laser cladding coating method for the graphite on the surface of the Mo3A cold roll, the graphite content in the Ni-coated graphite powder is 20-25 wt%, and the balance is Ni.
The invention has the advantages and effects that:
1. according to the invention, through proper adjustment of coating component regulation and control process parameters, the surface hardness of the Mo3A cold roll is improved, and the effective service time is prolonged.
2. The method has simple process and safe and controllable process, does not generate toxic and harmful substances, does not cause environmental pollution, and is beneficial to realizing industrial production.
Drawings
FIG. 1 is a photograph of the microstructure of the coating of example 1.
FIG. 2 is a photograph of the microstructure of the abraded surface of the coating of example 1.
Detailed Description
The present invention will be described in detail with reference to the embodiments shown in the drawings.
Example 1
The laser clad coating used in this example consisted of 20 wt% Fe powder, 25 wt% Cr powder, 15 wt% Ni powder and 40 wt% Ni-clad graphite powder.
And carrying out sand blasting treatment on the surface of the Mo3A cold roll to remove an oxide film and oil stains.
And conveying the mixed powder to the surface of a Mo3A cold roll by using a coaxial powder conveying device, wherein the powder conveying speed is 2 mm/min, and the offset angle is 15 degrees.
And (3) adopting a laser cladding technology to regulate and control technological parameters to carry out surface repair. The laser power of the process is 5650 kW, and the power density of a laser is 292W/mm 2 The scanning speed is 220 mm/s, the spot area is 80 mm 2 The coating thickness was 1.1 mm.
And (3) machining and polishing the surface of the Mo3A cold roll by using an automatic mechanical grinding and polishing machine until the surface of the Mo3A cold roll meets the use precision requirement, and obtaining the surface coating with excellent performance. The microhardness and the coefficient of friction were measured (Table 1)
TABLE 1 microhardness and Friction coefficient of the repaired Mo3A cold roll surface
And carrying out flaw detection on the laser cladding coating to detect whether defects such as pits exist. The foregoing examples are provided for the purpose of illustration and description of the invention only and are not intended as a limitation thereon.
Example 2
The laser cladding coating used in this example consisted of 25 wt% Fe powder, 30 wt% Cr powder, 15 wt% Ni powder and 30 wt% Ni-clad graphite powder.
And carrying out sand blasting treatment on the surface of the Mo3A cold roll to remove an oxide film and oil stains.
And (3) conveying the mixed powder to the surface of a Mo3A cold roll by using a coaxial powder conveying device, wherein the wire feeding speed is 3 mm/min, and the offset angle is 9 degrees.
By laser meltingAnd (4) covering technology, and regulating and controlling technological parameters to repair the surface. The laser power of the process is 5800 kW, and the laser power density is 269W/mm 2 The scanning speed is 240 mm/s, the spot area is 75 mm 2 The coating thickness was prepared to be 1.2 mm.
And (3) machining and polishing the surface of the Mo3A cold roll by using an automatic mechanical polishing machine until the surface of the Mo3A cold roll meets the use precision requirement, thereby obtaining the surface cladding layer with excellent performance. The microhardness and the coefficient of friction were measured (Table 2)
TABLE 2 microhardness and Friction coefficient of the repaired Mo3A cold roll surface
And carrying out flaw detection on the laser cladding coating, and checking whether defects such as pits exist. The foregoing examples are provided for the purpose of illustration and description of the invention only and are not intended as a limitation thereon.
Example 3
The laser cladding coating used in this example consisted of 25 wt% Fe powder, 25 wt% Cr powder, 20 wt% Ni powder and 30 wt% Ni-clad graphite powder.
And carrying out sand blasting treatment on the surface of the Mo3A cold roll to remove an oxide film and oil stains.
And (3) conveying the mixed powder to the surface of the Mo3A cold roll by using a coaxial powder conveying device, wherein the wire feeding speed is 5 mm/min, and the deviation angle is 22 degrees.
And (3) adopting a laser cladding technology, and regulating and controlling process parameters to repair the surface. The laser power of the process is 5900 kW, and the power density of the laser is 180W/mm 2 The scanning speed is 255 mm/s, and the spot area is 68 mm 2 . The coating thickness was prepared to be 1.3 mm.
And (3) machining and polishing the surface of the Mo3A cold roll by using an automatic mechanical polishing machine until the surface of the Mo3A cold roll meets the use precision requirement, thereby obtaining the surface cladding layer with excellent performance. The microhardness and the coefficient of friction were measured (Table 3)
And carrying out flaw detection on the laser cladding coating, and checking whether defects such as pits exist.
TABLE 3 microhardness and Friction coefficient of the repaired Mo3A cold roll surface
The foregoing examples are provided for the purpose of illustration and description of the invention only and are not intended as a limitation thereon.
Example 4
The laser clad coating used in this example consisted of 30 wt% Fe powder, 35 wt% Cr powder, 15 wt% Ni powder and 20 wt% Ni-clad graphite powder.
And carrying out sand blasting treatment on the surface of the Mo3A cold roll to remove an oxide film and oil stains.
And (3) conveying the mixed powder to the surface of the Mo3A cold roll by using a coaxial powder conveying device, wherein the wire feeding speed is 5 mm/min, and the offset angle is 10 degrees.
And (3) adopting a laser cladding technology to regulate and control technological parameters to carry out surface repair. The laser power of the process is 6000 kW, and the power density of a laser is 322W/mm 2 The scanning speed is 230 mm/s, and the spot area is 90 mm 2 The thickness of the coating layer prepared was 0.9 mm.
And (3) machining and polishing the surface of the Mo3A cold roll by using an automatic mechanical polishing machine until the surface of the Mo3A cold roll meets the use precision requirement, thereby obtaining the surface cladding layer with excellent performance. The microhardness and the coefficient of friction were measured (Table 4)
TABLE 4 microhardness and Friction coefficient of the repaired Mo3A cold roll surface
And carrying out flaw detection on the laser cladding coating, and checking whether defects such as pits exist. The foregoing examples are provided for the purpose of illustration and description of the invention only and are not intended as a limitation thereon.
Example 5
The laser clad coating used in this example consisted of 20 wt% Fe powder, 25 wt% Cr powder, 5 wt% Ni powder and 50 wt% Ni-clad graphite powder.
And carrying out sand blasting treatment on the surface of the Mo3A cold roll to remove an oxide film and oil stains.
And (3) conveying the mixed powder to the surface of the Mo3A cold roll by using a coaxial powder conveying device, wherein the wire feeding speed is 7 mm/min, and the offset angle is 20 degrees.
And (3) adopting a laser cladding technology, and regulating and controlling process parameters to repair the surface. The laser power of the process is 5780 kW, and the power density of the laser is 198W/mm 2 The scanning speed is 200 mm/s, the spot area is 81 mm 2 The thickness of the coating layer prepared was 1.8 mm.
And (3) machining and polishing the surface of the Mo3A cold roll by using an automatic mechanical polishing machine until the surface of the Mo3A cold roll meets the use precision requirement, thereby obtaining the surface cladding layer with excellent performance. The microhardness and the coefficient of friction were measured (Table 5)
TABLE 5 microhardness and Friction coefficient of the repaired Mo3A cold roll surface
And carrying out flaw detection on the laser cladding coating to detect whether defects such as pits exist. The foregoing examples are provided for the purpose of illustration and description of the invention only and are not intended as a limitation thereon.
Example 6
The laser clad coating used in this example consisted of 20 wt% Fe powder, 25 wt% Cr powder, 15 wt% Ni powder and 40 wt% Ni-clad graphite powder.
And carrying out sand blasting treatment on the surface of the Mo3A cold roll to remove an oxide film and oil stains.
And (3) conveying the mixed powder to the surface of the Mo3A cold roll by using a coaxial powder conveying device, wherein the wire feeding speed is 9 mm/min, and the offset angle is 16 degrees.
And (3) adopting a laser cladding technology, and regulating and controlling process parameters to repair the surface. The laser power of the process is 5920 kW, and the power density of a laser is 229W/mm 2 Cleaning broomThe drawing speed is 210 mm/s, and the spot area is 77 mm 2 The coating thickness was prepared to be 1.6 mm.
And (3) machining and polishing the surface of the Mo3A cold roll by using an automatic mechanical grinding and polishing machine until the surface of the Mo3A cold roll meets the use precision requirement, and obtaining a surface cladding layer with excellent performance. The microhardness and the coefficient of friction were measured (Table 6)
TABLE 6 microhardness and Friction coefficient of the repaired Mo3A cold roll surface
And carrying out flaw detection on the laser cladding coating to detect whether defects such as pits exist. The foregoing examples are provided for the purpose of illustration and description of the invention only and are not intended as a limitation thereon.
Claims (6)
1. The laser cladding coating method for graphite on the surface of the Mo3A cold roll is characterized by comprising the following steps of:
1) Carrying out sand blasting treatment on the surface of the Mo3A cold roll to remove an oxide film and oil stains;
2) Conveying the mixed powder of 20-30 wt% of Fe powder, 25-35 wt% of Cr powder, 5-25 wt% of Ni powder and 20-50 wt% of Ni-coated graphite powder to the surface of a Mo3A cold roll by using a coaxial powder conveying device, wherein the powder conveying speed is 1-10 mm/min, and the offset angle is 5-30 degrees; adopting a laser cladding technology, and regulating and controlling technological parameters to repair the surface; the laser power of the process is 5200 to 6000 kW, and the laser power density is 100 to 667W/mm 2 The scanning speed is 200 to 290 mm/s, and the area of the light spot is 50 to 100 mm 2 The thickness of the prepared coating is 0.9 to 1.8 mm;
3) Machining and polishing the surface of the Mo3A cold roll by using an automatic mechanical polishing machine until the surface of the Mo3A cold roll meets the use precision requirement, and obtaining a surface coating with excellent performance;
4) And (4) carrying out flaw detection on the laser cladding coating, and checking whether defects such as pits exist or not.
2. The method for laser cladding of graphite on the surface of the Mo3A cold roll according to claim 1, wherein the particle size of the Fe powder is 30-120 μm.
3. The method for laser cladding of graphite on the surface of the Mo3A cold roll according to claim 1, wherein the granularity of the Cr powder is 40-100 μm.
4. The method for laser cladding of graphite on the surface of the Mo3A cold roll according to claim 1, wherein the particle size of the Ni powder is 25-110 μm.
5. The method for laser cladding of graphite on the surface of the Mo3A cold roll according to claim 1, wherein the particle size of the Ni-coated graphite powder is 20-90 μm.
6. The method for laser cladding of graphite on the surface of the Mo3A cold roll according to claim 1, wherein the Ni-coated graphite powder contains 20-25 wt% of graphite, and the balance is Ni.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210823066.5A CN115161634A (en) | 2022-07-14 | 2022-07-14 | Mo3A cold roll surface graphite laser cladding coating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210823066.5A CN115161634A (en) | 2022-07-14 | 2022-07-14 | Mo3A cold roll surface graphite laser cladding coating method |
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| CN115161634A true CN115161634A (en) | 2022-10-11 |
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| CN202210823066.5A Withdrawn CN115161634A (en) | 2022-07-14 | 2022-07-14 | Mo3A cold roll surface graphite laser cladding coating method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756998A (en) * | 2016-12-07 | 2017-05-31 | 山东大学苏州研究院 | A kind of Ni-based cladding layer of Laser Cladding on Titanium Alloy and its preparation technology |
| CN107119272A (en) * | 2017-07-05 | 2017-09-01 | 上海临仕激光科技有限公司 | A kind of method that port machine walks to take turns laser melting coating stainless steel coating |
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- 2022-07-14 CN CN202210823066.5A patent/CN115161634A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756998A (en) * | 2016-12-07 | 2017-05-31 | 山东大学苏州研究院 | A kind of Ni-based cladding layer of Laser Cladding on Titanium Alloy and its preparation technology |
| CN107119272A (en) * | 2017-07-05 | 2017-09-01 | 上海临仕激光科技有限公司 | A kind of method that port machine walks to take turns laser melting coating stainless steel coating |
Non-Patent Citations (1)
| Title |
|---|
| 罗健夫 等: "《中国再制造产业发展报告》", vol. 1, 31 January 2020, 机械工业出版社, pages: 40 - 41 * |
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Application publication date: 20221011 |