In the field work, we often encounter curved specimens, and various curved surfaces have different effects on the hardness test results. Under the condition of correct operation, the impact body falls on the surface of the specimen instantly at the same position as the plane specimen, so the universal support ring can be used. However, when the curvature is small to a certain size, the difference between the deformation and the elastic state of the plane condition is significant, which will make the rebound speed of the punch low, so that the Value of the Richter hardness is low.

The following hardness tester manufacturer xiaobian to talk about the impact of portable hardness tester measurement accuracy

1. Error of gear detection

In general, the Hardness tester can ensure the accuracy of gear tooth surface detection when the module is greater than 7, but when the module is less than 7, because the tooth surface is smaller; The test error is relatively large, so users can design the corresponding tooling according to the situation, which will be beneficial to reduce the error.

2. The influence of material elasticity and plasticity

The Richter value is not only related to hardness and strength, but also related to elastic modulus. The hardness value is the characteristic parameter of material hardness and plasticity, because the composition of both must be measured together.

In the elastic part, first of all, it is obviously affected by the E modulus. In this respect, when the static hardness of the material is the same, but the E value is different. The material with low E value has higher HL value.

According to the elastic modulus of the material. Alloy type and heat treatment state can classify various materials.

3. Influence of specimen curvature on accuracy

In the field work, we often encounter curved specimens, and various curved surfaces have different effects on the hardness test results. Under the condition of correct operation, the impact body falls on the surface of the specimen instantly at the same position as the plane specimen, so the universal support ring can be used. However, when the curvature is small to a certain size, the difference between the deformation and the elastic state of the plane condition is significant, which will make the rebound speed of the punch low, so that the Value of the Richter hardness is low

。

4. Errors caused by data conversion

Leeb hardness conversion into other hardness error includes two aspects, on the one hand is the magnitude of hardness measurement error, the hardness on the Richter scale conversion for other hardness when error includes two aspects, on the one hand is the magnitude of hardness measurement error in itself, it involves the same dispersion method of repeated trial and for many sets of the same magnitude of the error of the hardness tester. On the other hand, it is the error caused by comparing the hardness measured by different hardness test methods, because there is no clear physical relationship between various hardness test methods, and it is affected by the unreliability of measurement in comparison.

The hardness conversion of this instrument is completed automatically, so brinell, Rockwell, Vickers and Shore hardness standard blocks can be used to directly determine the conversion error of the hardness tester.