CN117888166A - Method for reducing surface roughness of aluminum workpiece before anodic oxidation - Google Patents
Method for reducing surface roughness of aluminum workpiece before anodic oxidation Download PDFInfo
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- CN117888166A CN117888166A CN202410053571.5A CN202410053571A CN117888166A CN 117888166 A CN117888166 A CN 117888166A CN 202410053571 A CN202410053571 A CN 202410053571A CN 117888166 A CN117888166 A CN 117888166A
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- product
- grinding
- anodic oxidation
- soaking
- surface roughness
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000003647 oxidation Effects 0.000 title claims abstract description 23
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 23
- 230000003746 surface roughness Effects 0.000 title claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 238000000227 grinding Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910001868 water Inorganic materials 0.000 claims abstract description 28
- 238000002791 soaking Methods 0.000 claims abstract description 20
- 238000005498 polishing Methods 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 10
- 244000137852 Petrea volubilis Species 0.000 claims abstract description 8
- 238000005238 degreasing Methods 0.000 claims abstract description 8
- 238000009837 dry grinding Methods 0.000 claims abstract description 8
- 238000004439 roughness measurement Methods 0.000 claims abstract description 7
- 238000007689 inspection Methods 0.000 claims abstract description 6
- CUDYYMUUJHLCGZ-UHFFFAOYSA-N 2-(2-methoxypropoxy)propan-1-ol Chemical compound COC(C)COC(C)CO CUDYYMUUJHLCGZ-UHFFFAOYSA-N 0.000 claims description 11
- 238000009991 scouring Methods 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 239000003110 molding sand Substances 0.000 claims description 4
- 238000000861 blow drying Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000001238 wet grinding Methods 0.000 abstract description 6
- 239000000243 solution Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000005237 degreasing agent Methods 0.000 description 2
- 239000013527 degreasing agent Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention discloses a method for reducing surface roughness of an aluminum workpiece before anodic oxidation, which comprises the following steps: step 1, degreasing; step 2, soaking in pure water; step 3, drying; step 4, grinding sand paper; step 5, chemically fine grinding; step 6, soaking in pure water; step 7, drying; step 8, checking the strong light flashlight; step 9, roughness measurement: measuring the surface roughness of the product, and returning to the step 4 if Ra is larger than 0.2 mu m until Ra is smaller than 0.2 mu m; step 10, hanging an anode; the invention adopts the whole complete process of degreasing, rough grinding, chemical fine grinding, strong light inspection and roughness measurement to clean and detect, combines the dry grinding and the wet grinding in a chemical and physical mode, can effectively reduce the roughness of the product before anodic oxidation, reaches the roughness required during anodic oxidation by 100 percent, and completely avoids the exposure and reworking risks of an oxide layer caused by polishing after oxidation.
Description
Technical Field
The invention relates to the technical field of aluminum surface treatment, in particular to a method for reducing surface roughness of an aluminum workpiece before anodic oxidation.
Background
The machining industry has evolved and innovated over the last decades from the original basic machining to the densification and upscaling. The related products are globalized from China, and the surface treatment requirements on the products are also higher and higher. Some 5,6 are aluminium material products can leave the annular material line when shaping in extrusion forming process in the product inside, and this kind of line is very big to the roughness after the anodic oxidation, if do not pass special treatment, can make the roughness surpass normal scope often, greatly increased reworking quantity and cost of labor, cause the product to scrap even.
Disclosure of Invention
The invention aims to provide a method for reducing the surface roughness of an aluminum workpiece before anodic oxidation, which aims to solve the problem that the roughness of the aluminum workpiece after oxidation is overlarge due to the material grain in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method for reducing surface roughness of an aluminum work piece prior to anodic oxidation, comprising the steps of:
Step 1, degreasing: soaking the product by adopting a mixed solution of HNO 3 and dipropylene glycol methyl ether;
step 2, soaking in pure water: fishing out the product in the step 1, and placing the product into a pure water tank to overflow and soak for 1 hour;
step 3, drying: taking out the product in the step 2, and drying the surface and the water in the holes of the product by adopting compressed and dried air;
step 4, grinding sand paper: dry grinding the product by using a pneumatic grinder;
step 5, chemically fine grinding: the product is subjected to wet fine grinding by using a scouring pad, and chemical polishing liquid is required to be added in the grinding process;
Step 6, soaking in pure water: soaking the product treated in the step 5 in pure water for half an hour, and then washing the surface of the product by using a water gun;
Step 7, blow-drying: drying the water on the surface and in the holes of the product by adopting compressed and dried air again;
Step 8, strong light flashlight inspection: carefully observing the surface of the product by using a strong light flashlight until no lines are visible to naked eyes;
step 9, roughness measurement: measuring the surface roughness of the product, and returning to the step 4 if Ra is larger than 0.2 mu m until Ra is smaller than 0.2 mu m;
And step 10, hanging an anode.
In the step 1, the mass ratio of HNO 3, dipropylene glycol methyl ether and H 2 O is: 10-20:1-5:75-89.
Wherein, the mass ratio of HNO 3, dipropylene glycol methyl ether and H 2 O is as follows: 15:2:83.
Wherein, in the steps 1-9, water is used, which is industrial grade ordinary pure water; step 10 is ultrapure water.
Wherein, in the step 1, the soaking temperature is 45-55 ℃ and the soaking time is 1H.
In the step 4, the pneumatic grinding machine is a5 inch pneumatic palm molding sand light dust collection grinding machine, the sand paper adopted by the grinding machine is commercial 240# pneumatic flocking sand paper, and the using method is pneumatic dry grinding.
In the step 5, the grinding machine is a 5 inch pneumatic palm molding sand light dust-absorbing grinding machine. The scouring pad is commercially available 7447# pneumatic flocking scouring pad, the chemical polishing solution is commercially available neutral aluminum alloy polishing solution, and the using method is wet grinding.
In step 8, the bright light flashlight is a commercially available white light source bright light flashlight.
In step 9, the surface roughness of the product is measured by adopting a coarser detection method, wherein the coarser is a commercially available portable coarser in Sanfeng Japan, and the surface roughness range Ra of the aluminum product is required to be less than 0.2 mu m.
Compared with the prior art, the invention has the beneficial effects that:
The invention adopts the whole complete process of degreasing, rough grinding, chemical fine grinding, strong light inspection and roughness measurement to clean and detect, combines the dry grinding and the wet grinding in a chemical and physical mode, can effectively reduce the roughness of the product before anodic oxidation, reaches the roughness required during anodic oxidation by 100 percent, and completely avoids the exposure and reworking risks of an oxide layer caused by polishing after oxidation.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A method for reducing surface roughness of an aluminum work piece prior to anodic oxidation, comprising the steps of:
Step 1, degreasing: the product is soaked by adopting a mixed solution of HNO 3 and dipropylene glycol methyl ether, and the mass ratio of HNO 3, dipropylene glycol methyl ether and H 2 O is as follows: 10-20:1-5:75-89, wherein HNO3, dipropylene glycol methyl ether and H2O are combined to form a degreasing agent, and preferably, the mass ratio of HNO 3, dipropylene glycol methyl ether and H 2 O is as follows: 15:2:83; HNO 3 is commercial industrial grade HNO 3 with the concentration of 68 percent, dipropylene glycol methyl ether is commercial industrial grade 99.7 percent, and water is general industrial grade pure water; heating the mixed solution to 45-55deg.C, soaking the product in the mixed solution for 1H, taking out, and observing whether the surface oil is completely removed. If the waste is not completely removed, continuing soaking;
Step 2, soaking in pure water: after the degreasing product in the step 1 is fished out, the degreased product is placed into a pure water tank to be overflowed and soaked for 1 hour, and preferably, the overflow soaking is used for removing the residual degreasing agent more completely;
step 3, drying: taking out the product in the step 2, and drying the surface and the water in the holes of the product by adopting compressed and dried air;
Step 4, grinding sand paper: the product is dry ground using a pneumatic grinder, preferably a5 inch pneumatic palm sand light dust suction grinder. The sand paper used is commercial 240# pneumatic flocking sand paper. The using method is pneumatic dry grinding, the dry grinding can be more effective, and whether the discharge lines are completely ground can be more intuitively observed;
Step 5, chemically fine grinding: the product is subjected to wet fine grinding by using the scouring pad, and chemical polishing liquid is required to be added in the grinding process, and preferably, the grinding machine is a 5 inch pneumatic palm molding sand polishing dust collection grinding machine. The scouring pad is a commercially available 7447# pneumatic flocking scouring pad, the polishing solution is a commercially available neutral aluminum alloy polishing solution, and the use of the neutral polishing solution can avoid corroding a base metal. The use method is wet grinding, the wet grinding can reduce the high temperature generated by grinding, and the surface of the product can be finer;
Step 6, soaking in pure water: soaking the product treated in the step 5 in pure water for half an hour, and then washing the surface of the product by using a water gun;
Step 7, blow-drying: drying the water on the surface and in the holes of the product by adopting compressed and dried air again;
Step 8, strong light flashlight inspection: carefully observing the surface of the product by using a strong light flashlight until no lines are visible to naked eyes; the strong light flashlight is a commercially available domestic white light source strong light flashlight. Transferring the product to a place with darker light, and obliquely irradiating the surface of the product by using a strong light flashlight so as to observe the surface state;
Step 9, roughness measurement: measuring the surface roughness of the product, and returning to the step 4 if Ra is larger than 0.2 mu m until Ra is smaller than 0.2 mu m; the adopted coarseness gauge is a commercially available Japanese Sanfeng portable coarseness gauge, the surface coarseness range Ra of an aluminum product is required to be less than 0.2 mu m, and the measuring points are 10 different points of the product;
Step 10, hanging an anode; the product treated by the procedures can be directly hung on an anode, the roughness reaches the standard, and the reworking rate is zero.
In summary, the whole complete process of degreasing, coarse grinding, chemical fine grinding, high-light inspection and roughness measurement is adopted for cleaning and detection, and the combination of the dry grinding and the wet grinding in a chemical and physical mode can effectively reduce the roughness of the product before anodic oxidation, 100% of the roughness reaches the roughness required during anodic oxidation, so that the risks of exposure and reworking of an oxide layer caused by polishing after oxidation are completely avoided.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A method for reducing surface roughness of an aluminum work piece prior to anodic oxidation, comprising the steps of:
Step 1, degreasing: soaking the product by adopting a mixed solution of HNO 3 and dipropylene glycol methyl ether;
step 2, soaking in pure water: fishing out the product in the step 1, and placing the product into a pure water tank to overflow and soak for 1 hour;
step 3, drying: taking out the product in the step 2, and drying the surface and the water in the holes of the product by adopting compressed and dried air;
step 4, grinding sand paper: dry grinding the product by using a pneumatic grinder;
step 5, chemically fine grinding: the product is subjected to wet fine grinding by using a scouring pad, and chemical polishing liquid is required to be added in the grinding process;
Step 6, soaking in pure water: soaking the product treated in the step 5 in pure water for half an hour, and then washing the surface of the product by using a water gun;
Step 7, blow-drying: drying the water on the surface and in the holes of the product by adopting compressed and dried air again;
Step 8, strong light flashlight inspection: carefully observing the surface of the product by using a strong light flashlight until no lines are visible to naked eyes;
step 9, roughness measurement: measuring the surface roughness of the product, and returning to the step 4 if Ra is larger than 0.2 mu m until Ra is smaller than 0.2 mu m;
And step 10, hanging an anode.
2. A method of reducing surface roughness prior to anodic oxidation of an aluminum work piece as recited in claim 1, wherein: in the step 1, the mass ratio of HNO 3, dipropylene glycol methyl ether and H 2 O is: 10-20:1-5:75-89.
3. A method of reducing the surface roughness of an aluminum work piece prior to anodic oxidation as recited in claim 2, wherein: the mass ratio of HNO 3 to dipropylene glycol methyl ether to H 2 O is as follows: 15:2:83.
4. A method of reducing surface roughness prior to anodic oxidation of an aluminum work piece as recited in claim 1, wherein: in the step 1, the soaking temperature is 45-55 ℃ and the soaking time is 1H.
5. A method of reducing surface roughness prior to anodic oxidation of an aluminum work piece as recited in claim 1, wherein: in the step 4, the pneumatic grinding machine is a 5 inch pneumatic palm molding sand light dust collection grinding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410053571.5A CN117888166A (en) | 2024-01-15 | 2024-01-15 | Method for reducing surface roughness of aluminum workpiece before anodic oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410053571.5A CN117888166A (en) | 2024-01-15 | 2024-01-15 | Method for reducing surface roughness of aluminum workpiece before anodic oxidation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117888166A true CN117888166A (en) | 2024-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410053571.5A Pending CN117888166A (en) | 2024-01-15 | 2024-01-15 | Method for reducing surface roughness of aluminum workpiece before anodic oxidation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117888166A (en) |
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2024
- 2024-01-15 CN CN202410053571.5A patent/CN117888166A/en active Pending
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