CN117704995A - Accurate measurement method for coarse crystal ring of aluminum alloy extruded product - Google Patents
Accurate measurement method for coarse crystal ring of aluminum alloy extruded product Download PDFInfo
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- CN117704995A CN117704995A CN202311838839.8A CN202311838839A CN117704995A CN 117704995 A CN117704995 A CN 117704995A CN 202311838839 A CN202311838839 A CN 202311838839A CN 117704995 A CN117704995 A CN 117704995A
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- aluminum alloy
- extruded product
- coarse crystal
- alloy extruded
- coarse
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- 239000013078 crystal Substances 0.000 title claims abstract description 34
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 32
- 235000012438 extruded product Nutrition 0.000 title claims description 28
- 238000000691 measurement method Methods 0.000 title abstract description 14
- 239000000523 sample Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000002253 acid Substances 0.000 claims abstract description 18
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011259 mixed solution Substances 0.000 claims abstract description 13
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 26
- 239000003513 alkali Substances 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract 2
- 230000007797 corrosion Effects 0.000 abstract 2
- 238000001125 extrusion Methods 0.000 abstract 2
- 238000012360 testing method Methods 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012812 general test Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
The invention discloses a coarse-grain ring accurate measurement method in an aluminum alloy extrusion product, which sequentially erodes a ground aluminum alloy extrusion product to-be-measured sample by using a strong acid mixed solution and a nitric acid solution, adopts an image measuring machine with a probe after the coarse-grain ring is obviously displayed, accurately measures the depth of the coarse-grain ring after a green optical filter is additionally arranged, and stores a complete measurement photo. The strong acid corrosion time is one tenth of that of a common alkali corrosion method, the advantage of a large probe is skillfully utilized by the image measuring machine, the green filter is additionally arranged on the probe, the image of the coarse crystal ring of the sample can be clearly shown on the measuring software of the image measuring machine, the accurate measurement is carried out, the operation is simple and convenient, the artificial measurement error is reduced, the complete preservation of the measured picture is also realized, and the later tracing and comparison are convenient.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy product detection, and particularly relates to a coarse-grain ring accurate measurement method in an aluminum alloy extruded product.
Background
Coarse grain rings are annular coarse grain regions formed on the periphery of the extruded article and are a common structural defect of aluminum alloy extruded articles. The grain size in the coarse grain ring can exceed the original grain size by 10-100 times, reaching 800-1500 btm. The mechanical properties of the product are reduced, the fatigue resistance is lower than that of the central area, and cracks are often generated in a coarse-grain area when a blank with the defects is forged. Further, the aluminum profile having such defects becomes rough in surface during stretch-straightening and is not beautiful after anodic oxidation. Therefore, the coarse-grain ring is a low-power normal inspection item of an aluminum alloy extruded product, and a common inspection method is that a sample with a certain thickness is transversely cut at the tail end of the extruded product, a surface to be inspected of the extruded product is subjected to milling processing after quenching, the processed sample is eroded in sodium hydroxide solution for a certain time, then nitric acid is utilized to wash off a surface black film, and the depth of the coarse-grain ring is observed after clear water is cleaned. The maximum depth of the coarse-grain ring is taken as a measurement result when the coarse-grain ring is measured. The current common measurement method adopts a 10-time magnifying glass with a graduated scale for measurement, and can meet the detection requirements of most customers. However, the requirement of a high-precision aluminum material on the material is particularly strict, the maximum depth of a coarse crystal ring is required to be measured extremely accurately, and in the case of forming an image record, as each boundary of an annular coarse crystal grain area presents an irregular shape in a microscopic state, a tiny protruding part exists, and the protruding part cannot be effectively displayed under a 10-time magnifying glass, if the large-time magnifying glass is used for measurement, the depth of the coarse crystal ring is too large to exceed the range of a lens, so that the effective measurement cannot be performed, and a measurement image cannot be completely intercepted or photographed, so that a method for accurately measuring the depth of the coarse crystal ring of an aluminum alloy product and forming a measurement image is required.
Disclosure of Invention
The invention aims to solve the technical problems that the existing coarse-grain ring measuring method cannot meet the requirement that the high-precision aluminum material needs to accurately measure the coarse-grain ring depth of the material and form a measuring image, and provides a coarse-grain ring accurate measuring method for an aluminum alloy extruded product, which is simple and convenient to operate.
In order to achieve the purpose, the invention adopts the following technical scheme:
an accurate measurement method for a coarse crystal ring of an aluminum alloy extruded product comprises the following steps:
repeatedly wiping the inspected surface of the processed aluminum alloy extruded product by using a strong acid mixed solution, immediately washing the inspected surface with water, wiping the surface by using a nitric acid solution, and washing the inspected surface with water again until the coarse crystal ring of the aluminum alloy extruded product clearly appears;
naturally drying the aluminum alloy extruded product after secondary water washing, observing a plurality of suspected deepest coarse crystal rings by naked eyes, and marking the suspected deepest coarse crystal rings;
opening an image measuring machine, adding a green filter on the probe, and placing the aluminum alloy extruded product in the second step under the probe of the three-coordinate instrument;
and step four, adjusting the height of the probe of the image measuring machine and the distance between the probe and the optical filter until the clearest coarse crystal ring image appears, then accurately measuring the marked position in the step two by using the measuring software of the image measuring machine, comparing after measuring several marked positions, recording the maximum depth of the coarse crystal ring, and photographing and storing by using the software.
In the first step, the strong acid mixed solution is prepared by uniformly mixing mixed acid and water in a volume ratio of 1:1-1:3, and the mixed acid is prepared by uniformly mixing hydrofluoric acid and aqua regia in a volume ratio of 1:3-1:7.
Preferably, in the first step, the nitric acid solution is a mixed solution of nitric acid and water in a volume ratio of 1:3-1:5.
Preferably, in the first step, before wiping by the strong acid mixed solution, the surface to be inspected of the aluminum alloy extruded product is milled and polished, so that the roughness of the surface to be inspected is less than or equal to 3.2 mu m.
The invention has the beneficial effects that:
according to the invention, an aluminum alloy extruded product with high precision requirements on coarse-grain ring measurement is sequentially wiped on an erosion surface by adopting a strong acid mixed solution (mixed solution of hydrofluoric acid, aqua regia and water) and a nitric acid solution, the erosion time is one tenth of that of a common alkali erosion method, the advantage of a large probe is ingeniously utilized by an image measuring machine, a green filter (without the filter) is additionally arranged on the probe, an image of the sample coarse-grain ring cannot be displayed, the image of the sample coarse-grain ring can be clearly displayed on measuring software of the image measuring machine, accurate measurement is performed, the operation is simple and convenient, the artificial measurement error is reduced, the complete preservation of a measured picture is realized, and the tracing and comparison in later period are convenient.
Drawings
FIG. 1 is a rough crystal ring image of an aluminum alloy extruded product obtained by the measurement method of the invention.
Detailed Description
The operation of the method for precisely measuring the coarse crystal ring of the aluminum alloy extruded product of the invention is described in detail below.
1. Principle of measurement
And sequentially eroding the ground aluminum alloy extruded product to-be-detected sample by using a strong acid mixed solution and a nitric acid solution, after the coarse crystal ring is obviously displayed, accurately measuring the depth of the coarse crystal ring by adopting an image measuring machine with a probe, and storing a complete measurement photo after the green filter is additionally arranged.
2. Test device and reagent
Test equipment: image measuring machine, model: SVM302011; the manufacturing factory: the Cirence measurement technique (Shenzhen) Inc.
Reagent: mixing hydrofluoric acid and aqua regia in the volume ratio of 1 to 5 to obtain mixed acid, and mixing mixed acid and water in the volume ratio of 1 to 2 to obtain the mixed acid.
Nitric acid solution (1+4).
3. Sample requirement
Milling and polishing the inspected surface of the sample if necessary to ensure that the roughness is less than or equal to 3.2 mu m.
4. Test
4.1 repeatedly wiping the processed surface of the sample to be inspected by using a strong acid mixed solution, immediately washing the surface by using water, wiping the surface by using a nitric acid solution, and washing the surface by using water again until the coarse crystal ring of the sample clearly appears.
And 4.2, naturally drying the sample, observing a plurality of suspected deepest coarse crystal rings by naked eyes, and marking the suspected deepest coarse crystal rings.
4.3 Opening the image measuring machine, adding a green filter on the probe of the image measuring machine, and placing the sample under the probe of the image measuring machine.
4.4 adjusting the height of the probe of the image measuring machine and the distance between the probe and the optical filter until the clearest coarse crystal ring image appears, then accurately measuring the marked position in the step two by using the measuring software of the image measuring machine, comparing after measuring several marked positions, recording the maximum depth of the coarse crystal ring, and photographing and storing by using the software.
The maximum depth of the coarse crystal ring of the sample obtained by the measurement method is 3.096 mu m. The measurement image is shown in fig. 1.
5. Short term stability test
The above method was used to continuously measure the coarse crystal ring 11 times for 2 (1 #, 2 #) samples of different aluminum alloy extrudates, respectively, and the relative standard deviations of the measured values are shown in table 1.
The results in Table 1 show that the maximum depth measurement average value of the No. 1 sample coarse-grain ring is 3.096mm, the relative standard deviation is 0.055%, the maximum depth measurement average value of the No. 2 sample coarse-grain ring is 5.256mm, the relative standard deviation is 0.069%, the requirements of the relative standard deviation of the general test method are better than the requirements of less than 2.0%, and the method meets the test requirements.
6. Long-term stability test
The same aluminum alloy extruded product sample (3 #) was measured once a day using the method described above for 6 consecutive days, and the relative standard deviation of the 6 measurements was repeated as shown in Table 2.
The results in Table 2 show that the standard deviation of the 6 repeated measured values is 0.16%, the relative standard deviation is 0.042%, and the method meets the test requirements better than the requirement that the relative standard deviation of the general test method is less than 2.0%.
7. Accuracy test
The measurement results of the same aluminum alloy extruded product sample by the measurement method and the existing measurement method (the processed sample is immersed in 100g/L sodium hydroxide solution for 25min, the black film on the surface is washed off by nitric acid, the surface is observed and measured by a microscope after the clean water is washed, and only the sample with shallow depth of the coarse crystal ring can be measured due to small microscope lens) are compared, and the result is shown in Table 3.
The results in Table 3 show that the difference between the measurement result of the No. 4 sample by the above measurement method and the measurement result of the prior method is 0.002 mu m, the difference between the measurement result of the No. 5 sample by the above measurement method and the measurement result of the prior method is 0.001 mu m, and the difference between the measurement result of the No. 6 sample by the above measurement method and the measurement result of the prior method is 0.002 mu m, and the measurement results are basically consistent, so that the method meets the test requirement.
Claims (4)
1. The method for precisely measuring the coarse crystal ring of the aluminum alloy extruded product is characterized by comprising the following steps of:
repeatedly wiping the inspected surface of the processed aluminum alloy extruded product by using a strong acid mixed solution, immediately washing the inspected surface with water, wiping the surface by using a nitric acid solution, and washing the inspected surface with water again until the coarse crystal ring of the aluminum alloy extruded product clearly appears;
naturally drying the aluminum alloy extruded product after secondary water washing, observing a plurality of suspected deepest coarse crystal rings by naked eyes, and marking the suspected deepest coarse crystal rings;
opening the image measuring machine, adding a green filter on the probe, and placing the aluminum alloy extruded product in the second step under the probe of the image measuring machine;
and step four, adjusting the height of the probe of the image measuring machine and the distance between the probe and the optical filter until the clearest coarse crystal ring image appears, then accurately measuring the marked position in the step two by using the measuring software of the image measuring machine, comparing after measuring several marked positions, recording the maximum depth of the coarse crystal ring, and photographing and storing.
2. The method for accurately measuring the coarse crystal ring of the aluminum alloy extruded product according to claim 1, wherein in the first step, the strong acid mixed solution is prepared by uniformly mixing mixed acid and water in a volume ratio of 1:1-1:3, and the mixed acid is prepared by uniformly mixing hydrofluoric acid and aqua regia in a volume ratio of 1:3-1:7.
3. The method for accurately measuring coarse crystal ring of aluminum alloy extruded product according to claim 1, wherein in the first step, the nitric acid solution is a mixed solution of nitric acid and water in a volume ratio of 1:3-1:5.
4. A method for accurately measuring a coarse crystal ring of an aluminum alloy extruded product according to any one of claims 1 to 3, wherein in the first step, before wiping with a strong acid mixed solution, the inspected surface of the aluminum alloy extruded product is milled and polished so that the roughness of the inspected surface is less than or equal to 3.2 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311838839.8A CN117704995A (en) | 2023-12-28 | 2023-12-28 | Accurate measurement method for coarse crystal ring of aluminum alloy extruded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311838839.8A CN117704995A (en) | 2023-12-28 | 2023-12-28 | Accurate measurement method for coarse crystal ring of aluminum alloy extruded product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117704995A true CN117704995A (en) | 2024-03-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311838839.8A Pending CN117704995A (en) | 2023-12-28 | 2023-12-28 | Accurate measurement method for coarse crystal ring of aluminum alloy extruded product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117704995A (en) |
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2023
- 2023-12-28 CN CN202311838839.8A patent/CN117704995A/en active Pending
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Inventor after: Liu Haisheng Inventor after: Zhou Yi Inventor after: Kong Xiangyin Inventor after: Shao Zhenkun Inventor after: Tian Yonghong Inventor after: Wu Jiang Inventor after: Ma Xiaoqian Inventor after: Wang Ruchao Inventor after: Chen Wenhui Inventor after: Ma Jisheng Inventor after: Wang Xinping Inventor before: Shao Zhenkun Inventor before: Kong Xiangyin Inventor before: Tian Yonghong Inventor before: Wu Jiang Inventor before: Ma Xiaoqian Inventor before: Wang Ruchao Inventor before: Chen Wenhui Inventor before: Ma Jisheng Inventor before: Wang Xinping Inventor before: Zhou Yi |
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