CN114351139A - Fatigue-resistant surface treatment process for mountain bike bowl group - Google Patents
Fatigue-resistant surface treatment process for mountain bike bowl group Download PDFInfo
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- CN114351139A CN114351139A CN202111652562.0A CN202111652562A CN114351139A CN 114351139 A CN114351139 A CN 114351139A CN 202111652562 A CN202111652562 A CN 202111652562A CN 114351139 A CN114351139 A CN 114351139A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000008569 process Effects 0.000 title claims abstract description 31
- 238000004381 surface treatment Methods 0.000 title claims abstract description 30
- 238000000227 grinding Methods 0.000 claims abstract description 87
- 239000000843 powder Substances 0.000 claims abstract description 60
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 25
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine powder Natural products NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000000498 ball milling Methods 0.000 claims abstract description 14
- 238000005498 polishing Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 241000270295 Serpentes Species 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000003921 oil Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 3
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- 230000000052 comparative effect Effects 0.000 description 14
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 239000001307 helium Substances 0.000 description 6
- 229910052734 helium Inorganic materials 0.000 description 6
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 6
- 229920000877 Melamine resin Polymers 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention belongs to the technical field of bicycle part manufacturing, and particularly relates to a fatigue-resistant surface treatment process for a mountain bicycle bowl group. The method comprises the following steps: removing an oxide layer and oil stains on the surface of the bowl group; step two: adding the bowl group, the grinding balls and the grinding powder into a ball mill for ball milling; the grinding powder contains superfine nickel powder and melamine powder; step three: taking out the bowl group and cleaning floating slag on the surface, then placing the bowl group in a closed cavity, adjusting the atmosphere in the closed cavity to be inert atmosphere, and then scanning the surface of the bowl group by using laser; step four: and after the bowl group is cooled, taking out the bowl group and polishing the surface of the bowl group to be flat. According to the fatigue-resistant surface treatment process for the mountain bike bowl group, provided by the invention, a hardened layer which is firmly combined is formed on the surface of a bowl group base material in a mechanical smearing and laser irradiation mode, so that the abrasion and the failure of the bowl group are inhibited. In addition, the surface treatment process has the advantages of simple steps, convenience in automatic operation and the like.
Description
Technical Field
The invention belongs to the technical field of bicycle part manufacturing, and particularly relates to a fatigue-resistant surface treatment process for a mountain bicycle bowl group.
Background
The bowl group is a medium for connecting the bicycle frame and the front fork, and has the main function of ensuring that the bicycle frame and the front fork are rotatably connected and simultaneously limiting the front fork in the radial direction and the axial direction. Accordingly, the bowl cluster surface needs to withstand large loads and friction over a long period of time, which presents significant challenges to the design and manufacture of the bowl cluster. Particularly, in the mountain bike, the bowl group is frequently impacted and bumped in the long-term use process, and the abrasion and the peeling of the surface layer of the bowl group are accumulated for a long time to cause the bowl group to lose effectiveness, even threaten the driving safety.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a fatigue-resistant surface treatment process for a mountain bike bowl group.
The invention provides a fatigue-resistant surface treatment process of a mountain bike bowl group, which comprises the following steps:
the method comprises the following steps: removing an oxide layer and oil stains on the surface of the bowl group;
step two: adding the bowl group, the grinding balls and the grinding powder into a ball mill for ball milling; the grinding powder contains superfine nickel powder and melamine powder;
step three: taking out the bowl group and cleaning floating slag on the surface, then placing the bowl group in a closed cavity, adjusting the atmosphere in the closed cavity to be inert atmosphere, and then scanning the surface of the bowl group by using laser;
step four: and after the bowl group is cooled, taking out the bowl group and polishing the surface of the bowl group to be flat.
The invention provides a fatigue-resistant surface treatment process of a mountain bike bowl group, and aims to form a hardened layer fused with a base material on the surface of the bowl group, so that the bowl group is prevented from being damaged in the using process, and the function of the bowl group is maintained. The surface treatment process provided by the invention firstly removes an oxide layer and oil stains on the surface of the bowl group to expose the base material of the bowl group; then the surface of the bowl group base material is rubbed with the superfine nickel powder and the melamine powder in a ball milling mode, and a composite layer of nickel and melamine is formed by mechanically smearing the surface of the bowl group base material; then, laser scanning is adopted, so that nickel atoms on the surface layer of the base material move violently at high temperature, melamine on the surface layer of the base material is instantaneously decomposed to form carbon-containing ion fragments and nitrogen-containing ion fragments, meanwhile, the surface layer of the base material is melted at high temperature, nickel, carbon and nitrogen atoms permeate to the surface layer of the base material under the action of violent thermal movement, a high-carbon, high-nitrogen and high-nickel element distribution state is formed on the surface layer, and the surface layer of the base material is rapidly cooled along with the leaving of a laser spot to form a compact hardened layer which is firmly fused with a base material body; the hardened layer formed in the above steps has a rough surface, and the bowl group with a smooth and compact surface and high hardness can be obtained through subsequent polishing treatment.
Further, in the second step, the grinding powder further comprises nano silicon dioxide powder and water. The nano silicon dioxide powder has high hardness and is used as a friction agent in the grinding process to form friction marks on the surface of the bowl group base material, so that the efficiency of mechanically coating the superfine nickel powder and the melamine powder is improved. In the ball milling process, the humidity of the grinding powder must be controlled within a proper range, and the grinding powder contains a small amount of polar water molecules, so that the grinding powder is in full contact and adhesion with the base material, and the nickel powder and the melamine are promoted to form a mechanical smearing effect on the surface of the bowl group base material under the extrusion and friction action of the grinding balls; however, if the water content of the grinding powder is too high, the contact and combination between water molecules are gradually increased, the lubricating effect of water is gradually formed, the friction of the grinding powder on the surface of the bowl group base material is weakened, and the mechanical smearing effect is not favorably formed. Preferably, the grinding powder comprises the following components by mass:
100 portions of nano silicon dioxide powder
80-100 parts of superfine nickel powder
60-85 parts of melamine powder
And adjusting the humidity of the grinding powder by water to ensure that the water content in the grinding powder is 6-9%.
Further, in the third step, the laser scanning operation is preferably continuous scanning, and the laser power density is set to be 320-450W/cm2And controlling the moving speed of the laser spot to enable any position on the center line of the laser spot path to be continuously irradiated for 6-9 s.
Further, in the third step, the laser spots are circular, the laser spots are controlled to move in a snake shape on the surface of the bowl group, and the overlapping amount between the adjacent laser bands is 10-15%. The light spots move in a snake shape on the surface of the bowl group, so that the light spot paths can be prevented from forming intersection, and the actual irradiation parameters are seriously deviated from the preset values due to repeated irradiation at the intersection. In addition, because metal has excellent thermal conductivity, heat conduction at the edge of the light spot is also conducted to the outer side of the light spot besides heat conduction from the surface layer of the base material to the bulk of the base material, so that the temperature of the edge of the light spot is low, and a proper amount of lap joint is needed. In addition, because the laser spot irradiation only acts on the surface layer of the base material, when the laser spot leaves, the high-temperature surface layer is rapidly cooled due to heat conduction to the surrounding and bulk phase, and a high-hardness wear-resistant layer is formed. If other heating methods are adopted, the whole bowl assembly is generally required to be heated, so that the material of the bulk phase of the bowl assembly is subjected to heat treatment to change the property, and the heat on the surface layer of the substrate cannot be rapidly conducted to the surrounding and bulk phase, so that the rapid cooling of the surface layer of the substrate cannot be realized.
Further, in the third step, the atmosphere in the closed chamber contains 2-3% by volume of ammonia gas, and the balance inert gas. The atmosphere in the closed chamber should be inert, such as helium, argon, etc., to prevent the surface layer from rapidly oxidizing at high temperature to form loose scale. In addition, a small amount of ammonia gas can be further added into the inert atmosphere, the ammonia gas has weak reducibility and can strengthen the protection of the surface layer of the base material, and meanwhile, the surface layer of the base material and the ammonia gas react at high temperature of laser to form a small amount of nitride, so that the hardness of the surface layer is further strengthened.
Further, in the first step, an oxide layer on the surface of the bowl group is removed by using a grinding wheel, sand paper or a sand belt, then the bowl group is immersed in ethanol for ultrasonic oscillation for 10-20min, and the bowl group is taken out and naturally dried.
Further, in the second step, the grinding balls are preferably ceramic balls with the diameter of 3-6 mm.
Further, the material of the bowl group is preferably Cr4Mo4V steel.
Furthermore, the mass ratio of the bowl group, the grinding balls and the grinding powder is 20-30:100: 60-80.
Furthermore, in the upper surface treatment process, the second step, the third step and the fourth step are repeated for 1-3 times, so that the effect of the nickel powder, the melamine and the surface layer of the base material can be strengthened, the penetration of nickel, nitrogen and carbon elements is strengthened, and the thickness of the surface hardening layer is further increased.
Has the advantages that: compared with the prior art, the fatigue-resistant surface treatment process for the mountain bike bowl group provided by the invention has the advantages that a hardened layer which is firmly combined is formed on the surface of the bowl group base material in a mechanical smearing and laser irradiation mode, so that the abrasion and the failure of the bowl group are inhibited. In addition, the surface treatment process has the advantages of simple steps, convenience in automatic operation and the like.
Drawings
FIG. 1 shows the effect of ammonia content in an inert atmosphere on the surface treatment effect.
FIG. 2 shows the effect of the water content of the abrasive powder on the surface treatment effect.
FIG. 3 shows the effect of repeated strengthening on the surface treatment effect.
Detailed Description
The invention is further illustrated by the following specific examples, which are illustrative and intended to illustrate the problem and explain the invention, but not limiting.
Example 1
A fatigue-resistant surface treatment process for a mountain bike bowl group comprises the following steps:
the method comprises the following steps: removing an oxide layer and oil stains on the surface of the bowl group;
step two: adding the bowl group, the grinding balls and the grinding powder into a ball mill for ball milling; the grinding powder contains superfine nickel powder (the particle size is in the range of 0.1-0.8 mu m, the same applies below) and melamine powder;
step three: taking out the bowl group and cleaning floating slag on the surface, then placing the bowl group in a closed cavity, adjusting the atmosphere in the closed cavity to be inert atmosphere, and then scanning the surface of the bowl group by using laser;
step four: and after the bowl group is cooled, taking out the bowl group, and polishing the surface of the bowl group to be flat by using an abrasive belt.
In the first step of this embodiment, an abrasive belt is used to polish and remove an oxide layer on the surface of the bowl group, then the bowl group is immersed in ethanol for ultrasonic oscillation for 10min, and the bowl group is taken out and naturally air-dried.
In the second step of this embodiment, the grinding balls, the grinding powder, and the bowl group are added into a ball milling tank, air is exhausted, nitrogen is filled as a protective atmosphere, and ball milling is performed for 30 min; the bowl group comprises grinding balls and grinding powder in a mass ratio of 20:100: 60; the bowl group is made of Cr4Mo4V steel; grinding balls made of ceramic materials are adopted, and the diameter of the grinding balls is 3 mm; the grinding powder comprises the following components in parts by mass:
100 portions of nano silicon dioxide powder
100 portions of superfine nickel powder
85 parts of melamine powder
And (3) adjusting the humidity of the grinding powder by water to ensure that the water content in the grinding powder is 6%.
In the third step of this embodiment, after the bowl group is taken out, nitrogen flow is used to purge the surface of the bowl group to remove scum and moisture attached to the surface, and then the bowl group is placed in a closed chamber, and the atmosphere in the closed chamber is controlled to be helium; when the laser is scanned, the laser is used for continuous scanning, and the laser power density is 320W/cm2Controlling the moving speed of the light spot to enable any position on the center line of the laser light spot path to be continuously irradiated for 9 s; the laser spots are circular, the laser spots are controlled to move in a snake shape on the surface of the bowl group, and the lap joint quantity between the adjacent laser bands is 15%.
Example 2
A fatigue-resistant surface treatment process for a mountain bike bowl group comprises the following steps:
the method comprises the following steps: removing an oxide layer and oil stains on the surface of the bowl group;
step two: adding the bowl group, the grinding balls and the grinding powder into a ball mill for ball milling; the grinding powder contains superfine nickel powder and melamine powder;
step three: taking out the bowl group and cleaning floating slag on the surface, then placing the bowl group in a closed cavity, adjusting the atmosphere in the closed cavity to be inert atmosphere, and then scanning the surface of the bowl group by using laser;
step four: and after the bowl group is cooled, taking out the bowl group, and polishing the surface of the bowl group to be flat by using an abrasive belt.
In the first step of this embodiment, an abrasive belt is used to polish and remove an oxide layer on the surface of the bowl group, then the bowl group is immersed in ethanol for ultrasonic oscillation for 20min, and the bowl group is taken out and naturally air-dried.
In the second step of this embodiment, the grinding balls, the grinding powder, and the bowl group are added into a ball milling tank, air is exhausted, nitrogen is filled as a protective atmosphere, and ball milling is performed for 20 min; the bowl group comprises grinding balls and grinding powder, wherein the mass ratio of the grinding balls to the grinding powder is 30:100: 80; the bowl group is made of Cr4Mo4V steel; grinding balls made of ceramic materials are adopted, and the diameter of the grinding balls is 6 mm; the grinding powder comprises the following components in parts by mass:
100 portions of nano silicon dioxide powder
80 parts of superfine nickel powder
60 portions of melamine powder
And (3) adjusting the humidity of the grinding powder by water to enable the water content in the grinding powder to be 9%.
In the third step of this embodiment, after the bowl group is taken out, nitrogen flow is used to purge the surface of the bowl group to remove scum and moisture attached to the surface, and then the bowl group is placed in a closed chamber, and the atmosphere in the closed chamber is controlled to be helium; when the laser is scanned, the laser is used for continuous scanning, and the laser power density is 450W/cm2Controlling the moving speed of the laser spot to enable any position on the center line of the laser spot path to be continuously irradiated for 6 s; the laser spots are circular, the laser spots are controlled to move in a snake shape on the surface of the bowl group, and the lap joint quantity between the adjacent laser bands is 10%.
Example 3
A fatigue-resistant surface treatment process for a mountain bike bowl group comprises the following steps:
the method comprises the following steps: removing an oxide layer and oil stains on the surface of the bowl group;
step two: adding the bowl group, the grinding balls and the grinding powder into a ball mill for ball milling; the grinding powder contains superfine nickel powder and melamine powder;
step three: taking out the bowl group and cleaning floating slag on the surface, then placing the bowl group in a closed cavity, adjusting the atmosphere in the closed cavity to be inert atmosphere, and then scanning the surface of the bowl group by using laser;
step four: and after the bowl group is cooled, taking out the bowl group, and polishing the surface of the bowl group to be flat by using an abrasive belt.
In the first step of this embodiment, an abrasive belt is used to polish and remove an oxide layer on the surface of the bowl group, then the bowl group is immersed in ethanol for ultrasonic oscillation for 20min, and the bowl group is taken out and naturally air-dried.
In the second step of this embodiment, the grinding balls, the grinding powder, and the bowl group are added into a ball milling tank, air is exhausted, nitrogen is filled as a protective atmosphere, and ball milling is performed for 30 min; the bowl group comprises grinding balls and grinding powder, wherein the mass ratio of the grinding balls to the grinding powder is 25:100: 70; the bowl group is made of Cr4Mo4V steel; grinding balls made of ceramic materials are adopted, and the diameter of the grinding balls is 5 mm; the grinding powder comprises the following components in parts by mass:
100 portions of nano silicon dioxide powder
85 parts of superfine nickel powder
Melamine powder 70 parts
And (3) adjusting the humidity of the grinding powder by water to ensure that the water content in the grinding powder is 6%.
In the third step of this embodiment, after the bowl group is taken out, nitrogen flow is used to purge the surface of the bowl group to remove scum and moisture attached to the surface, and then the bowl group is placed in a closed chamber, and the atmosphere in the closed chamber is controlled to be helium; when the laser is scanned, the laser is used for continuous scanning, and the laser power density is 420W/cm2Controlling the moving speed of the light spot to enable any position on the center line of the laser light spot path to be continuously irradiated for 8 s; the laser spots are circular, the laser spots are controlled to move in a snake shape on the surface of the bowl group, and the lap joint amount between the adjacent laser bands is 12%.
Blank sample
The bowl group made of Cr4Mo4V steel was not treated.
Comparative example 1
The comparative example differs from example 3 only in the composition of the grinding powder, and the grinding powder used in the comparative example comprises the following components by mass:
85 parts of superfine nickel powder
Melamine powder 70 parts
And (3) adjusting the humidity of the grinding powder by water to ensure that the water content in the grinding powder is 6%.
Comparative example 2
The comparative example differs from example 3 only in the composition of the grinding powder, and the grinding powder used in the comparative example comprises the following components by mass:
100 portions of nano silicon dioxide powder
Melamine powder 70 parts
And (3) adjusting the humidity of the grinding powder by water to ensure that the water content in the grinding powder is 6%.
Comparative example 3
The comparative example differs from example 3 only in the composition of the grinding powder, and the grinding powder used in the comparative example comprises the following components by mass:
100 portions of nano silicon dioxide powder
85 parts of superfine nickel powder
And (3) adjusting the humidity of the grinding powder by water to ensure that the water content in the grinding powder is 6%.
Comparative example 4
The comparative example differs from example 3 only in the atmosphere upon laser scanning, and the atmosphere used in the comparative example is air.
The hardness of each sample obtained as described above was measured, and the results are shown in table 1. In examples 1 to 3 and comparative examples 1 to 3, the dark gray dense layers with different surface colors can be obtained, and in comparative example 4, the surface layer is completely peeled off when the operation of step four is performed.
TABLE 1
Influence of the Ammonia content in the inert atmosphere during laser scanning
The same procedure as in example 3 was followed except that the atmosphere in the closed chamber was changed to that in example 3, and specifically, ammonia gas was added to helium gas at different volume fractions, and the results are shown in FIG. 1. Along with the gradual increase of the ammonia content in helium from zero to zero, the hardness of the treated bowl group is obviously improved, when the ammonia content exceeds 3%, the hardness of the bowl group is reduced and is still higher than that of the atmosphere without ammonia, preferably, when the ammonia content is 2-3%, the hardness can reach above 985.
Influence of the moisture content of the grinding powder
The same operation as in example 3 was carried out except that the water content of the ground powder was changed based on example 3, and the results are shown in FIG. 2. Under the condition of no water or extremely low water content, the strengthening effect of the surface treatment process is weak, grinding powder is difficult to adhere to the surface of the bowl group, the probability of forming mechanical smearing under the action of grinding balls is greatly reduced, and the mechanical smearing effect is poor; when the water content in the grinding powder exceeds 9%, the lubricating effect of water is gradually formed, so that the mechanical smearing effect is sharply weakened.
Effects of repetitive enhancement
On the basis of the example 3, the operations of the second step to the fourth step are repeated to harden the surface of the bowl group for a plurality of times, and the result is shown in fig. 3. The mechanical smearing and laser scanning are carried out on the surface of the bowl group for multiple times under the same operation condition, the hardness of the bowl group can be improved to a certain degree, the improvement effect of the initial operations for multiple times is relatively obvious, the surface hardness is improved, but the improvement effect gradually disappears along with the increase of the hardening times.
The above embodiments are exemplary only, and are intended to illustrate the technical concept and features of the present invention so that those skilled in the art can understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A fatigue-resistant surface treatment process for a mountain bike bowl group is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: removing an oxide layer and oil stains on the surface of the bowl group;
step two: adding the bowl group, the grinding balls and the grinding powder into a ball mill for ball milling; the grinding powder contains superfine nickel powder and melamine powder;
step three: taking out the bowl group and cleaning floating slag on the surface, then placing the bowl group in a closed cavity, adjusting the atmosphere in the closed cavity to be inert atmosphere, and then scanning the surface of the bowl group by using laser;
step four: and after the bowl group is cooled, taking out the bowl group and polishing the surface of the bowl group to be flat.
2. The fatigue-resistant surface treatment process for the mountain biking bowl group as claimed in claim 1, wherein: in the second step, the grinding powder comprises the following components by mass:
100 portions of nano silicon dioxide powder
80-100 parts of superfine nickel powder
60-85 parts of melamine powder
And adjusting the humidity of the grinding powder by water to ensure that the water content in the grinding powder is 6-9%.
3. The fatigue-resistant surface treatment process for the mountain biking bowl group as claimed in claim 2, wherein: in the third step, the surface of the bowl group is continuously scanned by using laser with the power density of 320-2And controlling the moving speed of the laser spot to enable any position on the center line of the laser spot path to be continuously irradiated for 6-9 s.
4. The fatigue-resistant surface treatment process for the mountain biking bowl group as claimed in claim 3, wherein: in the third step, the laser spots are circular, the laser spots are controlled to move in a snake shape on the surface of the bowl group, and the lap joint quantity between the adjacent laser bands is 10-15%.
5. The fatigue-resistant surface treatment process for the mountain biking bowl group as claimed in claim 3, wherein: in the third step, the atmosphere in the closed chamber contains 2-3% of ammonia gas by volume fraction, and the balance is inert gas.
6. The fatigue-resistant surface treatment process for the mountain biking bowl group as claimed in claim 1, wherein: in the first step, an oxide layer on the surface of the bowl group is removed by using a grinding wheel, abrasive paper or an abrasive belt, then the bowl group is immersed in ethanol for ultrasonic oscillation for 10-20min, and the bowl group is taken out and naturally dried.
7. The fatigue-resistant surface treatment process for the mountain biking bowl group as claimed in claim 1, wherein: in the second step, the grinding balls are preferably ceramic balls with the diameter of 3-6 mm.
8. The fatigue-resistant surface treatment process for the mountain biking bowl group as claimed in claim 1, wherein: the material of the bowl group is preferably Cr4Mo4V steel.
9. The fatigue-resistant surface treatment process for the mountain biking bowl group as claimed in claim 1, wherein: the mass ratio of the bowl group, the grinding ball and the grinding powder is 20-30:100: 60-80.
10. A fatigue-resistant surface treatment process for mountain biking bowl sets as claimed in any one of claims 1 to 9, wherein: repeating the step two, the step three and the step four for 1-3 times.
Priority Applications (1)
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| CN105018927A (en) * | 2015-07-17 | 2015-11-04 | 河北农业大学 | Method for preparing coating containing Ti (C and N) with melamine as carbon and nitrogen precursor |
| CN113667974A (en) * | 2021-09-01 | 2021-11-19 | 燕山大学 | Preparation method of wear-resistant metal-multi-element ceramic composite modified coating on surface of titanium alloy |
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| CN105018927A (en) * | 2015-07-17 | 2015-11-04 | 河北农业大学 | Method for preparing coating containing Ti (C and N) with melamine as carbon and nitrogen precursor |
| CN113667974A (en) * | 2021-09-01 | 2021-11-19 | 燕山大学 | Preparation method of wear-resistant metal-multi-element ceramic composite modified coating on surface of titanium alloy |
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