From the working characteristics of the Barcol hardness tester
in the text, we know that the Barcol hardness tester is a kind of hardness tester that operates by indentation reading and by indentation depth to determine the hardness of the specimen. It is mainly used in aluminum material, glass and soft plastic metal industry. How does it work in an indentation way?
Barcol hardness tester is easy to operate because of its simple structure, so the methods of its usage become also very simple. Specifically from the following three steps:
First, when measuring the hardness, the correction film should be left carefully.
In measuring the hardness of the sample, place the pressure pin tip and the foot of hardness tester on the surface of the measured object on the same plane. In order to ensure the accurate reading, you should ensure that there is no pressure around the tip in 1.6mm of the current pressure needle before leaving the pressure indentation. For calibrators of 0.79 mm thickness, it shall be obtained on both sides. Reading on the old indentation will affect the reading accuracy; therefore, you should provide sufficient corrective films.
Second, the pressure needle and the sample should be kept vertical to ensure measurement accuracy.
The needle must remain perpendicular to the surface of the pattern. To ensure vertical, the feet of hardness tester must be with the pressure needle tip in the same plane. The two planes of the feet must be connected to the same surface. Different rules of patterns should be installed in a fixture to ensure vertical maintenance. For flat objects, the hardness tester housing and feet can be properly padded to fit the thickness of the pattern. If the needle is not perpendicular to the surface, the reading will be not accurate.
Third, observe the indicator readings and pay attention to the peak of the reading.
Hold the handle of the hardness tester and then carefully press, observe the indicator readings, pay attention to the peak of the reading. For the soft material, the peak will fall a little, which is normal, because it is determined by the nature of the material which is being tested. As a general rule, the recommended number of measurements should increase as the material under test becomes softer.
Attention, when measuring the hardness of the sample, the structure and the size of needles determines the accuracy of the reading, so you should first check the state of the needle. If there is any wear, replace it immediately, it cannot be re-polished. When the needle is pressed against the surface of the specimen, be careful to press firmly to prevent the needle from sliding to one side. The readings on the indicator should be within the range of the correction mark. If not, refer to the following calibration procedure to calibrate the hardness tester.