Cemented carbide tool hardness (Hardness) Code H. Different hardness test method, the conventional representation Brinell hardness (HB), Rockwell hardness (HR), Vickers hardness (HV), Shore hardness (Hs), Leeb hardness (HL), which hard Brinell hardness and Rockwell hardness in the hardness of the alloy tool more commonly used, the contrast between the hardness of cemented carbide tool table complete the conversion between different representations.

Called Brinell hardness (HB), is that when the ball indenter is pressed into the surface of the test material, the pressure in the test surface the pit required load is divided by the residual dimple diameter calculated from the pit surface area quotient.

The ball is certainly better than the test material hard. If the ball is forcibly pressed into the hard material than it, will cause damage to the ball, and so can not test it hard material.

The Vickers hardness (HV), is pressed into the sharp corners of the diamond test material, the size of the pits formed at this time to determine the hardness. Corresponding with the Brinell hardness of the ball indenter, and this test uses the pyramid indenter.

Due to the principle of Vickers hardness Brinell hardness, so these two cemented carbide tool hardness test values are very similar.

Cemented carbide tool hardness in the Rockwell hardness (HR) is the most commonly used machine shop. Especially after heat treatment, hardness test parts generally Rockwell hardness test. Rockwell hardness test method is widely used, its causes is the Rockwell hardness of the method is simple. Whether Brinell hardness, Vickers hardness, and the test method are required to measure the diameter or diagonal length of the pits indenter is very troublesome.

When the first reference load pressure, and then use the pressure of the main carrier, and then restored to the reference load, the value calculated based on the depth of the pit before and after the two reference load difference is the Rockwell hardness.

Indenter used in Rockwell hardness test, 1/16in (1.588mm diameter) ball indenter (ball or tungsten carbide ball) and the diamond indenter (120 ° apex angle of the cone). Both pressure head need to be used separately. Because the main load varied, therefore, the combination of the pressure head and the main load is also varied. Depending on the combination of, are divided into A, B, C.......

Shore hardness (Hs) is frequently used in the machine shop job site test methods. Shore hardness test method with other hardness test method, i.e. the pressing head pressed into the formation of pits to determine the size of the hardness test method is completely different. It fell on front-end punch diamond the workpiece hardness test, test method determines the hardness value of its rebound height. The harder the workpiece, the punch, the greater springback value

Cemented Carbide Tool Hardness Comparison Table

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