In
Specimens that have been tested in the standard atmospheric test specified in GB6529.
2. Place the calibrated specimen on a stationary upper plate and clamp the specimen with a clamp at both ends of the plate. The abrasive is placed on a reciprocable lower plate and clamped at both ends of the plate with a clamp.
3. Place the upper plate on the lower plate to align the sample with the abrasive.
4. Apply the upper plate to the weight including the upper plate (
6 ± 0.01) kg of the load.
5. Turn on the power switch, set the required wear cycle, the tester turns on the wear test, the machine is every minute.
Work at a frequency of 90 cycles, grinding 750 cycles at the specified frequency, or until the sample wears through. If the sample is worn through before the specified period, the number of cycles during the wear of the sample and the wear of the sample shall be reported. If there is an abnormal situation in the middle, press the stop button to stop, and press the counter to clear the next test. key.
6. If the sample or abrasive slips in the clip, discard the sample, and test another piece after the wake-up adjustment. Replace the abrasive after each test.
The tensile test of the reference and wear samples is carried out separately in CB/T3923.1.
7. Calculation and representation of the results:
Calculate the percentage of strength loss for each set of tests, accurate to
1%:
Strong loss rate (%) =
[ (FA-FB)
÷FA]
×100
In the formula:
FA—reference fracture strength, N;
FB—the fracture strength of the wear sample,
N.
Calculation
The percentage of average strength loss and the coefficient of variation of the five groups of samples.
In
Specimens that have been tested in the standard atmospheric test specified in GB6529.
2. Place the calibrated specimen on a stationary upper plate and clamp the specimen with a clamp at both ends of the plate. The abrasive is placed on a reciprocable lower plate and clamped at both ends of the plate with a clamp.
3. Place the upper plate on the lower plate to align the sample with the abrasive.
4. Apply a total of (6 ± 0.01) kg of the load to the upper plate including the weight of the upper plate.
5. Turn on the power switch and set the required wear cycle. The tester starts the wear test. The machine works at a frequency of 90 cycles per minute, grinding 750 cycles at the specified frequency, or until the sample wears through. If the sample is worn through before the specified period, the number of cycles during the wear of the sample and the wear of the sample shall be reported. If there is an abnormal situation in the middle, press the stop button to stop, and press the counter to clear the next test. key.
6. If the sample or abrasive slips in the clip, discard the sample, and test another piece after the wake-up adjustment. Replace the abrasive after each test and separately refer to the reference and wear samples according to CB/T3923.1. Stretching test.
7. Calculation and representation of the results:
Calculate the percentage of strength loss for each set of tests, accurate to
1%:
Power loss rate
(%)=[ (FA-FB) ÷FA] ×100
In the formula:
FA—reference fracture strength, N;
FB—the breaking strength of the wear sample, N.
Calculation
The percentage of average strength loss and the coefficient of variation of the five groups of samples.
8. Test report:
The test report should include the following:
a) the number of this standard;
b) Identification of the sample (by
The provisions of GB14798);
c) the direction and front and back of the subject;
d) average strong loss rate, %;
e) coefficient of variation of strong loss, %;
f) deviate from any details of this standard, such as the number of cycles, load, etc.;
g) Abnormal conditions in the test, such as wear and tear.
5. [Test completed] Wipe the instrument clean for the next use. 
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