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Preparation of portable hardness tester
Oct 24, 2018

Preparation of portable hardness tester


Let's take a look at the following small series, the preparation of the portable hardness tester.


☆ The surface temperature of the sample should not be too high and should be less than 120 °C.


☆ The surface roughness of the sample should not be too large, otherwise it will cause measurement error. The surface to be tested of the sample must

It must be exposed to metallic luster and smooth and free of oil.


☆ Specimen weight requirements: For heavy-duty specimens larger than 5kg, no support is required; specimens with a weight of 2-5kg, specimens with overhanging parts and thin-walled specimens are supported by objects during testing to avoid impact. The force causes the specimen to deform, bend and move. For medium-sized specimens, they must be placed on a flat, strong surface. The specimens must be placed in a smooth position without any sloshing.


☆ Curved specimen: The test surface of the specimen is preferably flat. When the measured surface radius of curvature R is less than 30mm (D, DC, D+15, C, E, DL type impact device) and less than 50mm (G type impact device), the test shall use a small support ring or a profiled support. ring.


☆ The sample should have sufficient thickness. The minimum thickness of the sample should meet the requirements of Table 3.


☆ For samples with a hardfacing layer, the depth of the hardened layer shall comply with Table 3.


☆Coupling


—— For light samples, it must be tightly coupled with a strong support. The two coupling surfaces must be flat and smooth, and the amount of coupling agent should not be too much. The test direction must be perpendicular to the coupling plane;


——When the sample is a large-area plate, long rod, and bent piece, even if the weight and thickness are large, the test piece may be deformed and unstable, resulting in inaccurate test values, so it should be reinforced or supported on the back side of the test point.


☆ The magnetic properties of the sample itself should be less than 30 Gauss.


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