The hardness of a metal is not a fixed characteristic. Machine parts made of the same metal, but from different batches or ages, can have different levels of hardness. Rockwell hardness testing can provide important data to ensure metals are hard enough. metal’s Rockwell tester score allows manufacturers and engineers to determine if machine parts have been damaged through friction or erosion.
Often signs of damage are hidden from visual inspection. Sometimes the only method to determine whether damage has occurred is a hardness test. This test works through a process of assessing indentations created with diamond bits in specially designed machines. The depths of the indentations are measured and scores calculated based on the measurements. Although there are several types of tests and scales that can be used, Rockwell hardness testing remains one of the foremost methods due to its accuracy.
Since the overall quality of a product can be compromised by weakened parts, it is important to conduct regular and consistent evaluations. Testing machines have advanced to be able to test large and small parts. However, parts must have a minimum thickness to be properly tested.Sheet metal typically does not meet this minimum thickness and is too soft for the test to be accurate. In order to test sheet metal, a diamond anvil must be used. In addition, portable machines have also been developed to allow for more convenient and extensive access to parts.
Rockwell hardness testing tends to be the most accurate of tests and is one of the most widely used. For additional evaluation, a Leeb test can be used. Leeb tests are also used extensively, but rely on velocity rather than indentations in their calculations and are typically intended to assess larger pieces. Most machines using this method are portable, making them convenient to employ. Overall, products benefit from application of either of these methods to maintain safety and industry standards. For the most accurate testing, contact a professional trained in testing techniques.
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