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Which is Faster and More Convenient for Measuring Brake Disc Hardness: Ultrasonic Hardness Tester or Brinell Hardness Tester?


Brake disc hardness can be measured using a desktop Brinell hardness tester or a portable Ultrasonic hardness tester. Today, we will compare the speed and convenience of these hardness testers to determine which one is faster and more convenient for measuring the hardness of brake discs.


1. Overall Characteristics of Brake Discs: Brake discs have high weight, large surface area, and large volume.


2. Measurement Data:

   - Measurement time for testing 5 times HBW hardness values using an Ultrasonic hardness tester: 48 seconds

   - Measurement time for testing 1 time HBW hardness value using a Brinell hardness tester: 1 minute and 3 seconds

3. Conclusion:

   After conducting two sets of comparative experiments, it is evident that the time taken to measure a single point using the Brinell hardness tester is nearly equivalent to the time taken by the ultrasonic hardness tester to measure five points. Clearly, in scenarios where fast measurement is required, the Ultrasonic hardness tester is the better choice. Additionally, when dealing with large-sized and heavy workpieces, the Ultrasonic hardness tester is also more convenient.

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(Note: The brake discs used in this test are older and have rust and wear, so the measured data does not have high reference value. The purpose of this test was solely to compare measurement time and speed.)


[Digression] Additional Information about the Two Hardness Testers:

1. Different Indentation:

   The Brinell hardness tester creates larger indentations, while the ultrasonic hardness tester produces indentations similar to Vickers hardness impressions. These impressions, corresponding to a certain force in kilograms, are difficult to discern with the naked eye and require high-magnification microscopes to observe. It is one of the non-destructive testing methods for metal hardness.

2. Different Surface Roughness Requirements:

   The Brinell hardness tester has lower requirements for surface roughness. The ultrasonic hardness tester, on the other hand, has higher requirements but can address the influence of surface roughness on measurement results by selecting different test forces for the ultrasonic probe.


3. Different Applicability:

   The measured values obtained by the Brinell hardness tester can be considered approximate values of the true or standard hardness of the brake disc. The ultrasonic hardness tester requires calibration against this standard value to identify the hardness values of similar materials. Therefore, the Brinell hardness tester is suitable for obtaining relatively reliable standard hardness values through measurement, while the ultrasonic hardness tester, after calibration, is suitable for fast non-destructive batch testing of similar material workpieces.


4. Other Features:

   The Brinell hardness tester is comparatively more stable. The ultrasonic hardness tester provides faster measurement speed.

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