Crushing test is the one of the most popular measurement test to check the grain's toughness. Especially ball-milling method has advantage as a simple principle, but some tips are needed to obtain the accurate result.
Crushing test device; flyability tester, or ball milling machine) :the device gives reciprocating motion to installed capsule.
sample preparation Prepare the well-mixed grains, and extracted from "On-sieve" powder after using sieve shaker. |
crushing-preparation Check the capsule condition, and put 2cts of sample grains. Turn on the milling machine for "warm-up". |
crushing Estimate the time as about 50% garins being crushed, considering the garins type and its size. Crushing test shall be done with the estimated time, and more than 2 times are needed. |
measurement of crushed-abrasive grain
Sieving the crushed-abrasive grain, and weight the on-size grains. test1: Rotating Number:A ( "On sieve" weight after milling / Sample weight 2cts)×100= C%
test2: Rotating Number:B ( "On sieve" weight after milling / Sample weight 2cts)×100= D%
TI (50% crushed as Rotating Number basis)=A+(50-C)×(A-B)/(C-D)
・This measurement method could offer the test result as only the comparison data. Therefore, it suit to the toughness inspection compared to its standard grains.
・The result number could not compared to the other one done by other devices.