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Knowledge introduction of the full-angle Leeb hardness tester
Knowledge of full-angle Leeb hardness tester Full-angle Leeb hardness tester is for single-angle Leeb hardness tester. Almost all Leeb hardness testers on the market are single angle Leeb hardness testers. The calculation principle is based on the vertical downward impact device (probe). Therefore, when the angle measurement is changed, the calculated Leeb value increases continuously as the angle increases. At the same time, for materials of different hardness, the increase is also very different. For example: testing a test block of HLD750, when measuring vertically downward is HLD750, when the angle is changed to horizontal testing, the Leeb value is HLD757, which is 7 Leeb higher than the actual value. Also test the test block of HLD530, the Leeb value is HLD542 during the horizontal test, which is 12 Leeb higher than the actual value. From this example, it can be seen that the same material has a different Leeb value after changing the angle measurement. For materials with different hardness, the measurement of the same angle changes, and the degree of change of the Leeb value is also different. This is the so-called single-angle Leeb hardness tester, that is, the Leeb hardness calculated only when it is vertically downward is true, and the Leeb hardness values ​​in other directions are obviously untrue. In practice, it will cause a large measurement error. In order to solve this problem, it is often through artificial compensation to eliminate the large deviation caused by the angle change in the measurement, so that it can meet the accuracy requirements as much as possible. However, this kind of artificial compensation only reduces errors to a certain extent, is a last resort, and is not a fundamental solution. The Leeb hardness tester has the option of setting the direction. In fact, it is an artificial compensation program specially designed to compensate for the direction error. When you need to measure in which direction, choose which direction on the instrument, so that the calculated hardness value can meet the error requirements after the compensation program designed in advance by the instrument. This kind of artificial compensation is very rough in accuracy, and it is compensated every 45 degrees. For materials of different hardness, it is compensated once every 50 Leeb hardness values. Obviously, this compensation is neither continuous nor linear. If your measurement direction happens to be at 22.5 degrees, then which angle compensation you should choose becomes a problem. At the same time, the hardness of your material is just at the middle of every 50 Richter scale compensation, plus the instrument The accuracy of the measurement results can be imagined. Recently, foreign countries are also striving to continuously improve the performance of products, so that the instrument can automatically identify the measurement angle, and further reduce the gradient of the compensation through simple mathematical processing, reducing the error range. But basically, the soup is not changed, only the degree is different. The birth of the full-angle Leeb hardness tester completely solves this problem. To be precise, the full-angle Leeb hardness tester does not have this problem, so there is no such thing as "solving." The measurement of the full-angle Leeb hardness tester at any angle is based on the Leeb principle to calculate the hardness value. It does not matter whether it is up, down or horizontal. The same measurement result is obtained for the same workpiece in different directions, which greatly improves the measurement. Precision. The accuracy of the full-angle Leeb hardness tester is generally much higher than that of the single-angle Leeb hardness tester, especially in different directions. Generally, the accuracy of the full-angle hardness tester is ≤ ± 0.3% (when HL = 800), and the repeat accuracy is about ± 2HL. The full-angle Leeb hardness tester is a revolutionary product built on brand-new theories and calculation methods, marking that the development of the Leeb hardness tester in China has reached an internationally advanced level.