JB/T 7506-1994 Fixed abrasive wear test pin sandpaper disc sliding wear method
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7506-94
Fixed abrasive wear test
Pin-sandpaper disc sliding wear method
Issued on October 25, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on October 1, 1995
Mechanical Industry Standard of the People's Republic of China
Fixed abrasive wear test
Pin-sandpaper disc sliding wear method
1 Subject content and scope of application
JB/T750694
This standard specifies the test apparatus, sandpaper (cloth), specimens, test conditions, test procedures and the processing and expression methods of the test results of the fixed abrasive wear test (pin-sandpaper disc sliding wear method). This standard is applicable to the determination of wear when the material slides against the surface of sandpaper (cloth) under laboratory conditions, and provides data reflecting the wear characteristics of the tested material when it slides relative to the abrasive particles. The test results can be used to predict the relative order of wear resistance of the tested materials under the corresponding actual working conditions. 2 Reference standards
GB4891
Method for selecting sample size for estimating the average quality of a batch (or process) GB4979
Sheet-shaped abrasive cloth
JB3630
3 Method overview
Abrasive particle size composition for coated abrasives
The end face of a pin-shaped specimen that meets the standard is pressed vertically against the surface of a sandpaper (cloth) disc rotating at a specified speed with a certain load, and the specimen is fed radially at the same time, forming a friction track in the shape of an Archimedean spiral that does not overlap each other on the surface of the sandpaper (cloth), and the wear amount is measured after a certain friction stroke.
4 Test device and main technical requirements
4.1 The working principle of the test device is shown in Figure 1, which mainly consists of the following parts: foundation
Radial feeding of specimen
Sandpaper (cloth)
Disk hook speedboat rotation
Figure 1 Working principle diagram of the test device
A uniformly rotating disk with a flat surface on which sandpaper (cloth) of specified size can be fixed; specimen chuck and loading guide rod;
Foundation or other Loading system;
Approved by the Ministry of Machinery Industry on October 25, 1994
Implementation on October 1, 1995
JB/T7506-94
Specimen radial feeding system, with a scale indicating the distance between the center of the specimen end face and the center of the disc; d.
Automatic counting of the number of rotations of the disc and automatic shutdown system when the preset number of rotations is reached, or specimen radial feeding stroke control system: drive, transmission and its control system.
4.2 Main technical requirements
The surface roughness R of the disc plane shall not exceed 1.25μm; the tolerance of its end face runout is 150um; the tolerance of the perpendicularity between the specimen axis and the disc plane is 30um at two positions with a distance of 50mm; the required load for the test can be applied to the specimen:
The tolerance of the parallelism between the moving plane of the specimen radial feed system and the disc plane is 50um at two positions with a distance of 120mm in the feed direction; it should enable the specimen to move radially within the range from the edge to the center of the disc surface, and move freely without sticking or slipping; for one rotation of the disc, the radial feed amount of the specimen should be at least 2mm, 3mm, and 4mm for selection; e.
The graduation value of the disc rotation counting system is 0.1r; or the error of the specimen radial feed stroke control is ±1mm; f.
The disc and radial feed system should be able to achieve forward and reverse motion as needed and be linked to each other. 5 Sandpaper or emery cloth
Use water-resistant sandpaper or dry emery cloth produced in batches by any manufacturer that meets the following requirements. 5.1 The abrasive coated on the surface may be broken glass, quartz, garnet, corundum, or silicon carbide; if the purpose of the test study is to select material process or mechanism research for a specific working condition, typical minerals or other abrasives with similar hardness and particle shape may also be selected according to actual needs. 5.2 The particle size of the abrasive coated on the surface is P180, and its particle size composition shall comply with the relevant provisions of JB3630. 5.3 The technical requirements shall comply with the relevant provisions of GB4979. 5.4 Shape: a disc with a diameter of approximately 260 mm is recommended. 5.5 Prevent moisture, deformation, and breakage during storage. 6 Test specimens
6.1 Test specimens
6.1.1 Materials
In principle, any type of material (including ferrous and non-ferrous metals, ceramics, polymers, powder metallurgy products, composite materials, etc.) and spray (stack) welding layers, spray coatings, electric bonds or chemical heat treatment deposits with a thickness greater than 70um, as long as they can be processed into specimens with sizes and shapes that meet the requirements, can be used for this type of abrasive wear test.
6.1.2 Shape and size
The specimen can be a cylindrical pin with a nominal cross-sectional diameter or a nominal diameter of its circumscribed circle not greater than 4mm and a length of 10 to 25mm or a cylindrical pin with other cross-sectional shapes.
It is recommended to use a cylindrical pin specimen with a cross-sectional diameter of 4±0.01mm. 6.1.3 Other requirements
The verticality tolerance between the end face of the specimen and its axis is 12μm, and the roughness R of all surfaces is not greater than 1.6μm. The test surface of the specimen shall be free of any defects and attachments, except when the surface with such defects is itself the object of study. Different specimens shall be marked with obvious distinguishing marks on the non-test surface. 6.2 Standard specimens
Standard specimens are used by each laboratory to quantitatively monitor the fluctuation of the performance of abrasives coated on the surface of sandpaper or emery cloth and changes in other test conditions, and to correct the test results of the test specimens according to their wear test results to ensure the comparability of test data. 6.2.1 Standard specimens shall be made of materials that are easy to obtain and have relatively stable quality and performance. It is recommended to use a certain low-carbon or medium-carbon steel in the annealed state, and its hardness fluctuation range should be less than ±5HV or ±5HBS. 6.2.2. The cross-sectional shape and nominal dimensions of the standard specimen shall be the same as those of the test specimen. 7 Test conditions
Disc speed: 60±5r/min;
JB/T7506-94
Average contact pressure of the sample: 1.910±0.005MPa; b.
Radial feed of the sample: not less than the nominal diameter of the sample section or the nominal diameter of its circumscribed circle: c.
Friction stroke: 9m; the actual friction stroke can be appropriately extended or shortened according to the specific situation, but the final wear amount of the sample should not be less than 50μm (or 5mg);
Each test should be carried out on a new sandpaper or emery cloth surface. 8 Measuring instruments
A lever scale with a range of 0~25mm and a graduation value of 1um; b.
Analytical balance with a sensitivity of 0.1mg.
9 Test Procedure
9.1 Preparation
9.1.1 Clean the specimen with a solvent or cleaning agent to remove all dirt and (or) foreign matter on its surface, and then use appropriate methods to remove all solvent or cleaning agent remaining on and in the specimen. 9.1.2 Measure and record the actual cross-sectional dimensions of the specimen, accurate to 1 μm. 9.1.3 According to the selected test conditions, adjust the relevant systems of the test device to meet the requirements. 9.2 Pre-grinding of the test surface of the specimen
9.2.1 Return the radial feed system of the test device to the predetermined initial position. 9.2.2 Install the required new sandpaper or emery cloth on the disc of the test device and make it flat and free of ripples. 9.2.3 Clamp the prepared specimen securely in the specimen chuck, with the test surface outside the chuck and the protruding part length of about 3 mm; then install them into the test device and apply the predetermined load. 9.2.4 Start the test device, and stop automatically after reaching the preset friction stroke. 9.2.5 Repeat the above steps until the test surface of the sample is completely ground. 9.2.6 Remove the sample, wipe it clean, and measure and record its length (or mass) with an accuracy of 1um (or 0.1mg). 9.3 Test
Tests on a batch of different materials should be grouped according to the type of abrasive selected, and each group of tests should use sandpaper or sandpaper cloth with the same abrasive purchased from the same batch.
For each group of tests, before testing the test specimens, three pieces of sandpaper (cloth) are randomly selected from the selected sandpaper (cloth), and the test is repeated three times with the same standard specimen. At this time, the coefficient of variation of the test results should not exceed 5%. The calculation refers to formula (3) in 10.1.4: If this value is exceeded, the data of this group is invalid. The test device, test conditions, and test operation should be analyzed and checked to see if they are out of control, and appropriate measures should be taken to eliminate the cause of the deviation; then the standard specimen should be tested again three times. The average value of the effective test results shall be taken as the wear amount of the standard specimen for this group of tests. For large-scale tests that cannot be completed in one day, standard specimen tests shall be carried out every day according to the above requirements. 9.3.1 For the specimens that have passed the pre-grinding and have their original size (or mass) measured, generally repeat steps 9.2.1 to 9.2.4 and 9.2.6 once to complete a test; for materials with high wear resistance, steps 9.2.1 to 9.2.4 should be repeated several times without removing the specimen or making intermediate measurements, but with new sandpaper (cloth) replaced each time, until the final wear of the specimen is greater than 50um (or 5mg), and then step 9.2.6 should be performed. For the surface covering layer, the substrate or bottom layer should not be exposed after completing the specified test. 9.3.2 According to GB4891 and previous experience, each material should be tested at least three times; but for materials with a coefficient of variation of the test results greater than 5%, the total number of repeated tests should be no less than 5 times. 9.3.3 All repeated tests (including the aforementioned pre-grinding of the specimen) should make the relative position of the specimen and the fixture as similar as possible, and make the test results as accurate as possible.
10.1 Related concepts
JB/T7506-94
10.1.1 The wear of the specimen is equal to the length difference (length wear) or mass difference (mass wear) of the specimen before and after the test. 10.1.2 Relative wear is equal to the ratio of the length wear of the test specimen to the corresponding standard specimen under the same test conditions. 10.1.3 Relative wear resistance is the reciprocal of relative wear. 10.1.4 For n tests under the same test conditions, the formula for calculating the arithmetic mean value (s), standard deviation (s) and coefficient of variation (V, %) is as follows: =Zr/n
V=(s/)×100
10.2 Representation of test results
The test results of each material should be expressed as the relative wear resistance (e) or relative wear (1/e) for a certain abrasive and a certain standard material, which can be calculated according to formula (4) and formula (5) or formula (6) and (7) respectively: E
Where: A I-
actual length wear of the test specimen, um
actual length wear of the corresponding standard specimen, um: Sactual friction stroke of the test specimen, m; S,actual friction stroke of the corresponding standard specimen, m; A-actual cross-sectional area of the test specimen. mm2A,-actual cross-sectional area of the corresponding standard specimen, mm; An-actual mass wear of the test specimen, g; Am, actual mass wear of the corresponding standard specimen, g; o-density of the material of the test specimen. g/cm\0,
-density of the material of the corresponding standard specimen, g/cm. 10.3 Comparability of test results
+ (5)
10.3.1 The premise for direct comparison of the actual wear of the test specimens obtained in the test is that the cross-sectional shape and size of the specimens, the type of abrasive and its particle shape and particle size, and all other test conditions are the same. 10.3.2 The relative wear resistance or relative wear calculated based on the actual test results can be compared with each other as long as the type of abrasive used, the nominal average contact pressure of the specimen, and the standard specimen material are the same. 10.3.3 If only the type of abrasive used and the nominal average contact pressure of the specimen are the same, but the standard specimen materials are different, the relative wear resistance or relative wear obtained in this case can be converted to the conditions to be compared using formula (8) or formula (9), and then compared with each other, provided that both batches of tests have been conducted on the same material: Em-exE
where: . and 1/e.
e'. and 1/e'.
e\ and 1/e\m
JB/T750694
1/e.=1/e×
respectively represents the relative wear resistance and relative wear of material m relative to material a obtained by conversion; (9
respectively represent the relative wear resistance and relative wear of material c relative to material a obtained in the first batch of tests;
respectively represent the relative wear resistance and relative wear of material m relative to material b obtained in the second batch of tests;
respectively represent the relative wear resistance and relative wear of material c relative to material b obtained in the second batch of tests and e and 1/e\
wear.
wherein material c is the material tested in both batches of tests; materials a and b is the standard material used in the two batches of tests respectively; material m is the material that has only been tested in the second batch of tests, but is intended to be compared with the results of the first batch of tests. 11 Test report
The test report of this test should generally include the following contents: Commissioning unit;
Test sample material:
Test conditions. Mainly list the type and particle size of the abrasive used, the nominal average contact pressure of the sample, the standard sample material, the cross-sectional shape and nominal size of the sample c.
, the disc speed, the radial feed amount of the sample, and the friction stroke; d. Test results, mainly list the test materials Relative wear resistance or relative wear calculated based on actual test results, as well as their arithmetic mean, standard deviation and coefficient of variation; test date;
f. Tester.
In addition, some content may be appropriately added according to the requirements of the entrusting unit, such as the actual wear amount of the sample, conclusion and analysis, etc. Additional remarks:
This standard is proposed and managed by the Wuhan Materials Protection Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Wuhan Materials Protection Research Institute, and the Institute of Process Materials of the Chinese Academy of Agricultural Mechanization Sciences participated in the drafting. The main drafters of this standard are Hu Zengwen, Li Xiaoquan and Cao Ruiwen.
e'. And 1/e'.
e\ and 1/e\m
JB/T750694
1/e.=1/e×
respectively represent the relative wear resistance and relative wear of material m relative to material a obtained by conversion; (9
respectively represent the relative wear resistance and relative wear of material c relative to material a obtained in the first batch of tests;
respectively represent the relative wear resistance and relative wear of material m relative to material b obtained in the second batch of tests;
respectively represent the relative wear resistance and relative e and 1/e\
wear of material c relative to material b obtained in the second batch of tests.
Among them, material c is the material tested in both batches of tests; materials a and b are the standard materials used in the two batches of tests respectively; material m is the material tested only in the second batch of tests, but it is intended to be compared with the results of the first batch of tests. 11 Test report
The test report of this test is generally The following contents should be included: entrusting unit;
Test sample materials:
Test conditions. Mainly, the type and particle size of the abrasive used, the nominal average contact pressure of the sample, the standard sample material, the cross-sectional shape and nominal size of the sample c.
, the disc speed, the radial feed amount of the sample, and the friction stroke should be listed; d. Test results, mainly the relative wear resistance or relative wear calculated based on the actual test results of each test material, as well as their arithmetic mean, standard deviation and coefficient of variation; test date;wwW.bzxz.Net
f. Tester.
In addition, some contents can be appropriately added according to the requirements of the entrusting unit, such as the actual wear amount of the sample, conclusions and analysis, etc. Additional notes:
This standard is proposed and managed by the Wuhan Materials Protection Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Wuhan Materials Protection Research Institute, and the Institute of Process Materials of the Chinese Academy of Agricultural Mechanization Sciences participated in the drafting. The main drafters of this standard are Hu Zengwen, Li Xiaoquan, and Cao Ruiwen.
e'. And 1/e'.
e\ and 1/e\m
JB/T750694
1/e.=1/e×
respectively represent the relative wear resistance and relative wear of material m relative to material a obtained by conversion; (9
respectively represent the relative wear resistance and relative wear of material c relative to material a obtained in the first batch of tests;
respectively represent the relative wear resistance and relative wear of material m relative to material b obtained in the second batch of tests;
respectively represent the relative wear resistance and relative e and 1/e\
wear of material c relative to material b obtained in the second batch of tests.
Among them, material c is the material tested in both batches of tests; materials a and b are the standard materials used in the two batches of tests respectively; material m is the material tested only in the second batch of tests, but it is intended to be compared with the results of the first batch of tests. 11 Test report
The test report of this test is generally The following contents should be included: entrusting unit;
Test sample materials:
Test conditions. Mainly, the type and particle size of the abrasive used, the nominal average contact pressure of the sample, the standard sample material, the cross-sectional shape and nominal size of the sample c.
, the disc speed, the radial feed amount of the sample, and the friction stroke should be listed; d. Test results, mainly the relative wear resistance or relative wear calculated based on the actual test results of each test material, as well as their arithmetic mean, standard deviation and coefficient of variation; test date;
f. Tester.
In addition, some contents can be appropriately added according to the requirements of the entrusting unit, such as the actual wear amount of the sample, conclusions and analysis, etc. Additional notes:
This standard is proposed and managed by the Wuhan Materials Protection Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Wuhan Materials Protection Research Institute, and the Institute of Process Materials of the Chinese Academy of Agricultural Mechanization Sciences participated in the drafting. The main drafters of this standard are Hu Zengwen, Li Xiaoquan, and Cao Ruiwen.
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