Hardness meter in use matters needing attention

The hardness tester is an instrument for measuring the hardness value of materials. Many people use it because of non-standard operation, which often leads to inaccurate measurement results. Want to reduce the error, accurate determination of hardness, hardness tester should pay attention to what matters?

1. Use a standard block to calibrate the hardness tester before use.

2. The standard block is valid for one year from the date of calibration, and because the standard surface and back surface hardness may not be consistent, it cannot be used on both sides.

3, according to different materials, select the appropriate hardness parameter scale and range. Such as Rockwell hardness scale HRC scale and HRB scale selection.

4. When replacing components, such as indenter or anvil, be sure to pay attention to cleaning, it is best to clean the contacted parts. It is best to ensure that the replaced indenter or anvil is pressed against the part of the tester that is in good contact.

5. If the hardness tester is adjusted, the first test point is best not used. In addition, it is best to test at least three hardness values ​​in different parts of the test and average them to ensure the accuracy of the measurement results.

6, in the measurement, often encounter some complex test pieces, then need to use the corresponding shape of the pad fixed, and then measure.

7. Check whether the position of the loading handle is normal before loading, and when it is loaded, it is necessary to grasp the strength and at the same time, it should be light and stable.

8. After the loading is completed, the loading handle should be placed at the unloading position to avoid plastic deformation of the instrument and measurement errors.

9, if the hardness of the different principles need to be compared, the hardness of the comparison table can be converted before comparison.