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Portable Leeb hardness tester application and development
Oct 17, 2018

Portable Leeb hardness tester application and development

Let's take a look at the following small series, the application and development of portable Leeb hardness tester

First, what is the Leeb hardness

The concept of Leeb hardness is proposed by Dr. Dietmar Leeb of Switzerland, which is a dynamic hardness test. The impact body of the hardness sensor is multiplied by 1000 when it is impacted by the workpiece under test, and the ratio of the rebound velocity to the impact velocity is 1 mm, which is defined as the Leeb hardness value. The formula for calculating the Leeb hardness is HL: HL= Vb/Va×1000Vb: indicates the rebound speed Va: indicates the impact speed

Second, the characteristics of the Leeb hardness tester

1. Both Shore and Lee's hardness are dynamic test methods, but Xiao's investigation is the vertical height of the impact body rebound, so it is decided that the Shore hardness tester should be used vertically downwards, which is bound to cause a great deal in actual use. The limitation is that the Richter is different. The Richter examines the speed of the rebound and impact of the impact body. It can be used in any direction by speed correction, which greatly facilitates the user.

2, usually used cloth, Luo, Vickers hardness tester. Due to its large size, it is not convenient to use in the field, especially when testing large and heavy workpieces. Since the hardness tester table cannot be accommodated, it cannot be detected at all. The Leeb hardness tester does not require a workbench. Its hardness sensor is as small as a pen and can be directly operated by hand. It can be easily detected whether it is a large or heavy workpiece or a workpiece with complicated geometrical dimensions.

Third, the relevant factors of the hardness of the Leeb

Since the Leeb hardness test method is a dynamic load test method, the Leeb hardness value must be related to the elastic modulus E of the metal material. The different elastic modulus of the material is different, so the Leeb hardness tester is classified according to the type of material.

Fourth, the conversion of Leeb hardness and other hardness

There is a correspondence between the hardness value of Richter and other hardness values HRC, HRB, HB, HV and HSD. Therefore, the Richter value HL can be converted into other hardness values. The Leeb hardness tester can be automatically converted by the on-board microcomputer.

5. Classification comparison and testing requirements of Richter hardness and other hardness

From the microscopic deformation classification, cloth, Luo, Vickers hardness is the plastic deformation of the material, which is expressed as the size or depth of the indentation; the inner and the Shore hardness are the elastic deformation of the material, which is expressed as the rebound speed or height

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