SEVERAL COMMON HARDNESS UNITS IN INDUSTRY_Jiangsu Funlin Super Hard Tools Co., Ltd

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SEVERAL COMMON HARDNESS UNITS IN INDUSTRY Last week we made a preliminary understanding of Brinell hardness and Rockwell hardness, this week we will take a look at Vickers hardness, Leeb hardness and Shore hardness.

      Compared with the Vickers hardness Brinell and Rockwell hardness tests, the Vickers hardness test has a wider measurement range, from softer materials to super-hard materials, covering almost all kinds of materials.
The Vickers hardness measurement principle is basically the same as the Brinell hardness, and the hardness value is calculated based on the load per unit area of the indentation. The difference is that the indenter of the Vickers hardness test is a regular pyramid of diamond . During the test, under a certain load, a square cone-shaped indentation was pressed on the surface of the sample, and the diagonal length of the indentation was measured to calculate the surface area of the indentation. The value of the load divided by the surface area is the hardness of the sample Value, represented by the symbol HV.

Leeb hardness
      Leeb hardness is expressed in HL. It uses a certain mass of impact body equipped with a tungsten carbide ball head to impact the surface of the test piece under a certain force and then rebound. Due to the different hardness of the materials, the rebound speed after impact is also different. A permanent magnetic material is installed on the impact device. When the impact body moves up and down, its peripheral coil will induce an electromagnetic signal proportional to the speed, and then converted into a Leeb hardness value through an electronic circuit.

Shore hardness
      Shore hardness tester is referred to as HS. A standard indicating the hardness of a material. The elastic rebound method is used to drop the striker from a certain height onto the surface of the tested material and rebound occurs. The striker is a small cone with a tip, and diamond tips are often set on the tip. The test value is 1000x striker return speed / striker initial speed (that is, the speed ratio before and after collision multiplied by 1000)