Precautions for using the hardness testers
2022-05-05
1. After the durometer is adjusted, when starting to measure the hardness, the first test point is not used. For fear of poor contact between the sample and the anvil, the measured value is inaccurate. After the first point is tested and the hardness tester is in the normal operating mechanism state, the sample is formally tested, and the measured hardness value is recorded.
2. When the test piece allows, the Rockwell hardness tester generally selects different parts to test at least three hardness values, takes the average value, and takes the average value as the hardness value of the test piece.
3. For the specimen with complex shape, the corresponding shape of the pad should be used, which can be tested after being fixed. The round specimens are generally placed in the V-groove for testing.
4. Before loading, check whether the loading handle is placed in the unloading position. When loading, the action should be light and steady, and do not use too much force. After loading, the loading handle should be placed in the unloading position to prevent the instrument from being in a loaded state for a long time, resulting in plastic deformation and affecting the measurement accuracy.
2. When the test piece allows, the Rockwell hardness tester generally selects different parts to test at least three hardness values, takes the average value, and takes the average value as the hardness value of the test piece.
3. For the specimen with complex shape, the corresponding shape of the pad should be used, which can be tested after being fixed. The round specimens are generally placed in the V-groove for testing.
4. Before loading, check whether the loading handle is placed in the unloading position. When loading, the action should be light and steady, and do not use too much force. After loading, the loading handle should be placed in the unloading position to prevent the instrument from being in a loaded state for a long time, resulting in plastic deformation and affecting the measurement accuracy.
