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How To Use Portable Hardness Tester Correctly
Sep 20, 2018

How to use Portable Hardness Tester correctly

Let's talk about the following, how to use Portable Hardness Tester correctly.

1, Portable Hardness Tester itself will produce two kinds of errors:

One is the error caused by the deformation and movement of its parts;

The second is the error caused by the hardness parameter exceeding the specified standard.

For the second error, the hardness tester is calibrated with a standard block before measurement. For the Rockwell hardness test results, the difference is within ±1. A stable value with a difference of ±2 can give a correction value. When the difference is outside the range of ±2, the hardness tester must be repaired or replaced by other hardness test methods.

2. When replacing the indenter or anvil, pay attention to the contact parts to be cleaned. After the replacement, it is tested several times with a steel sample of a certain hardness until the hardness values obtained twice in succession are the same. The purpose is to make the contact part of the indenter or anvil and the testing machine compact, and the contact is good, so as not to affect the accuracy of the test result.

3. After the hardness tester is adjusted, when the hardness is measured, the test points are not used. The measured value is not accurate due to the fear that the sample is not in good contact with the anvil. After the test is completed, the hardness tester is in the normal operating mechanism state and then the sample is formally tested, and the measured hardness value is recorded.

4. When the test piece allows, generally select at least three hardness values for different parts, take the average value, and take the average value as the hardness value of the test piece.

5. For the shape of the test piece, the corresponding shape of the block should be used, and it can be tested after being fixed. The round test piece is generally tested in a V-groove.

6. Before loading, check whether the loading handle is placed in the unloading position. When loading, the action should be light and steady. Do not use too much force. After loading, the loading handle should be placed in the unloading position, so as to avoid the Leeb hardness tester being in a load state for a long time, plastic deformation occurs, which affects the measurement accuracy.