CN117947417A - Roller surface composite strengthening process for working roller of leveling machine - Google Patents
Roller surface composite strengthening process for working roller of leveling machine Download PDFInfo
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- CN117947417A CN117947417A CN202311584536.8A CN202311584536A CN117947417A CN 117947417 A CN117947417 A CN 117947417A CN 202311584536 A CN202311584536 A CN 202311584536A CN 117947417 A CN117947417 A CN 117947417A
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- working roll
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005728 strengthening Methods 0.000 title claims abstract description 15
- 239000002131 composite material Substances 0.000 title claims abstract description 12
- 238000005253 cladding Methods 0.000 claims abstract description 27
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 238000004372 laser cladding Methods 0.000 claims abstract description 10
- 239000004065 semiconductor Substances 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000007751 thermal spraying Methods 0.000 claims abstract description 4
- 230000007547 defect Effects 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 7
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 abstract description 8
- 238000013329 compounding Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 238000005498 polishing Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a composite strengthening process for a working roll surface of a leveling machine, which adopts a method of compounding laser cladding and thermal spraying, and specifically comprises the following steps: and manufacturing a cladding layer with the thickness of 2.5-3mm on the surface of the working roll by adopting a semiconductor laser, wherein the hardness of the cladding layer is HRC55-60, and then spraying WC on the surface of the working roll by adopting supersonic speed to form a coating, wherein the thickness of the coating is 0.1-0.15mm. The crushing resistance of the working roller obtained by the method is greatly improved, the wear resistance and the surface roughness maintaining capability are further improved, and the roller surface quality and the service life of the working roller are obviously improved.
Description
Technical Field
The invention belongs to the field of roller surface treatment, and particularly relates to a composite strengthening process for a working roller surface of a leveling machine.
Background
The working roll of the leveling machine is directly contacted with the strip steel, the abrasion degree of the working roll directly influences the magnitude of a friction factor between the strip material and a roller in a roll gap, the friction factor is used as a bridge to influence the setting precision of the rolling force and the control precision of the elongation, and finally the shape and the surface quality of a strip steel finished product are influenced, so that the uniformity of the abrasion resistance and the hardness of the roll surface of the working roll of the leveling machine is particularly important. At present, a traditional working roll of a leveling machine is mainly manufactured by forged steel, and the roll surface is generally subjected to chromium plating treatment for enhancing the wear resistance; however, the roller surface has insufficient wear resistance, the roller surface roughness cannot be maintained for a long time, and the roller surface is easy to crush.
Disclosure of Invention
The invention aims to provide a composite strengthening process for the roller surface of a working roller of a leveling machine, which overcomes the defects in the prior art.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
A roll surface composite strengthening process of a working roll of a leveling machine adopts a method of compounding laser cladding and thermal spraying, which comprises the following steps: and manufacturing a cladding layer with the thickness of 2.5-3mm on the surface of the working roll by adopting a semiconductor laser, wherein the hardness of the cladding layer is HRC55-60, and then spraying WC on the surface of the working roll by adopting supersonic speed to form a coating, wherein the thickness of the coating is 0.1-0.15mm.
Further, before the laser cladding, the working roller is processed, and the diameter of the working roller after processing is 5-6mm smaller than that of a finished product, and has no crack defect.
Further, the laser cladding of the invention adopts a laser with power of 5000-6000W and scanning speed of 300-450mm/min.
Further, the cladding layer is 2 layers, and the thickness of each layer is 1.5-2mm.
Further, after the laser cladding, the working roll is subjected to stress relief annealing by adopting a heat treatment furnace, wherein the annealing temperature is 500-520 ℃, and the heat preservation time is 6-8 hours; and then adopting a grinding machine to process the roll surface cladding layer, wherein the diameter ratio of the processed working roll is smaller than the diameter of a finished product (0.2-0.3 mm), and meanwhile, the roll surface is required to have no vibration marks and scratch defects.
Further, according to the composite strengthening process for the roller surface of the working roller of the leveling machine, the roller surface after spraying is polished by adopting the diamond abrasive belt.
The technical scheme of the invention has the following beneficial technical effects:
The invention adopts a composite process of laser cladding and thermal spraying to strengthen the working roller of the leveling machine, and the compressive capacity is greatly improved because the roller surface is supported by a cladding layer with high hardness; because the roll surface adopts supersonic spraying WC to replace chrome plating treatment, the wear resistance and the holding capacity of surface roughness are further improved, and therefore, the roll surface quality and the service life of the working roll are obviously improved.
Drawings
FIG. 1 is a coating impact tester for impact crushing performance test.
Detailed Description
The following examples are given to illustrate the present invention in further detail to facilitate a better understanding of the present invention by those skilled in the art.
Example 1
A composite strengthening process for a working roll surface of a leveling machine comprises the following steps:
(1) The surface of the working roll is processed before cladding, the diameter of the roll body after processing is 5mm smaller than the diameter of the finished product, and the surface roughness is 6.3;
(2) Performing dye check and ultrasonic flaw detection on the processed working roller, wherein the roller has no defects such as cracks and the like;
(3) Cladding the roll surface by adopting a 6KW semiconductor laser, wherein the cladding material is a high-hardness medium-entropy alloy material, the power of the laser is 5000W, the scanning speed is 300mm/min, the cladding layer number is 2, the thickness is 1.5 mm/layer, and the cladding layer hardness is HRC55-60;
(4) After cladding is finished, carrying out stress relief annealing by a heating furnace, wherein the annealing temperature is 500 ℃, and the heat preservation time is 8 hours;
(5) Adopting a grinding machine to process the roller surface cladding layer, wherein the diameter of a working roller after processing is 0.2mm smaller than that of a finished product, and meanwhile, the roller surface has no defects of vibration marks, scratches and the like;
(6) The roller surface is subjected to dye check, and the cladding layer has no defects such as cracks, air holes and the like;
(7) Spraying the surface of the working roll by adopting a Prachs JP8000 supersonic spraying device, wherein the spraying material is WC, and the thickness of the coating is 0.1mm;
(8) And polishing the sprayed roller surface by adopting a diamond abrasive belt, wherein the roughness of the roller surface after polishing is Ra0.8.
The work rolls prepared in this example failed after 1 year of use.
Example 2
A composite strengthening process for a working roll surface of a leveling machine comprises the following steps:
(1) The surface of the working roll is processed before cladding, the diameter of the roll body after processing is 6mm smaller than the diameter of the finished product, and the surface roughness is 6.3;
(2) Performing dye check and ultrasonic flaw detection on the processed working roller;
(3) Cladding the roll surface by adopting a 6KW semiconductor laser, wherein the cladding material is a high-hardness medium-entropy alloy material, the power of the laser is 6000W, the scanning speed is 450mm/min, the cladding layer number is 2, the thickness is 2 mm/layer, and the cladding layer hardness is HRC 55-60;
(4) After cladding is finished, carrying out stress relief annealing by a heating furnace, wherein the annealing temperature is 520 ℃, and the heat preservation time is 6 hours;
(5) Adopting a grinding machine to process the roller surface cladding layer, wherein the diameter of a working roller after processing is 0.3mm smaller than that of a finished product, and meanwhile, the roller surface has no defects of vibration marks, scratches and the like;
(6) The roller surface is subjected to dye check, and the cladding layer has no defects such as cracks, air holes and the like;
(7) Spraying the surface of a working roll by adopting a Prachs JP8000 supersonic spraying device, wherein the spraying material is WC, and the thickness of the coating is 0.15mm;
(8) And (3) carrying out roller surface polishing treatment after spraying by adopting a diamond abrasive belt, wherein the roller surface roughness after polishing is Ra0.8.
The work rolls prepared in this example failed after 1 year of use.
Comparative example 1
The roller surface is treated by using a conventional chromium plating process, and the roller surface is specifically as follows:
(1) The working roll surface is processed before electroplating, the diameter of the roll body after processing is 0.2 smaller than the diameter of the finished product, and the surface roughness is 0.8;
(2) Performing dye check and ultrasonic flaw detection on the processed working roller;
(3) Adopting electroplating equipment to manufacture a coating material on the surface of the working roller, wherein the electroplating material is Cr, and the thickness of the coating is 0.1mm;
(8) And (3) performing roller surface polishing treatment after chromium plating by adopting a diamond abrasive belt, wherein the roller surface roughness after polishing is Ra0.8.
The working rolls prepared in this comparative example failed after 3 months of use.
The work rolls prepared in example 1, example 2 and comparative example 1 were subjected to abrasion resistance test according to the method for abrasion test of metallic Material of GB-T12444-2006, and impact crushing resistance test was performed as follows.
Impact crush performance test:
(1) Test principle: the impact resistance of the coating is simulated and characterized by adopting a mode that impact force is caused to the metal coating by falling of the metal ball, the experiment is repeated until the coating is peeled off, and finally the impact frequency is used for measuring the quality of the impact resistance.
(2) The test process comprises the following steps: the coating impact tester shown in fig. 1 was used for testing, and the test conditions were: single ball weight: 3.3g, impact travel 1000mm, ball drop count of each group 500, impact angle 60 degrees, test results are shown in Table 1.
The results of the impact crushing performance and abrasion resistance tests of the working rolls of examples 1-2 and comparative example 1 are shown in Table 1.
Table 1 impact crushing resistance and wear resistance of working rolls of examples and comparative examples
Claims (6)
1. A leveling machine working roll surface composite strengthening process is characterized by adopting a laser cladding and thermal spraying composite method, and specifically comprises the following steps: and manufacturing a cladding layer with the thickness of 2.5-3mm on the surface of the working roll by adopting a semiconductor laser, wherein the hardness of the cladding layer is HRC55-60, and then spraying WC on the surface of the working roll by adopting supersonic speed to form a coating, wherein the thickness of the coating is 0.1-0.15mm.
2. The process for compositely strengthening the roll surface of the working roll of the leveling machine according to claim 1, wherein the working roll is processed before the laser cladding, and the diameter of the working roll after the processing is 5-6mm smaller than the diameter of a finished product and has no crack defect.
3. The process for compositely strengthening the roll surface of the working roll of the leveling machine according to claim 1, wherein the laser cladding adopts a laser power of 5000-6000W and a scanning speed of 300-450mm/min.
4. The process for compositely strengthening the roll surface of the working roll of the leveling machine according to claim 1, wherein the thickness of each cladding layer is 1.5-2mm.
5. The process for compositely strengthening the roll surface of the working roll of the leveling machine according to claim 1 or 2, wherein the stress relief annealing is carried out by adopting a heat treatment furnace after the laser cladding, the annealing temperature is 500-520 ℃, and the heat preservation time is 6-8h; and then adopting a grinding machine to process the roll surface cladding layer, wherein the diameter of the processed working roll is 0.2-0.3mm smaller than the size of a finished product, and meanwhile, the roll surface is required to have no vibration marks and scratch defects.
6. The process for compositely strengthening the roller surface of the working roller of the leveling machine according to claim 1, wherein the roller surface after spraying is polished by a diamond abrasive belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311584536.8A CN117947417A (en) | 2023-11-26 | 2023-11-26 | Roller surface composite strengthening process for working roller of leveling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311584536.8A CN117947417A (en) | 2023-11-26 | 2023-11-26 | Roller surface composite strengthening process for working roller of leveling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117947417A true CN117947417A (en) | 2024-04-30 |
Family
ID=90800369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311584536.8A Pending CN117947417A (en) | 2023-11-26 | 2023-11-26 | Roller surface composite strengthening process for working roller of leveling machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117947417A (en) |
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2023
- 2023-11-26 CN CN202311584536.8A patent/CN117947417A/en active Pending
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