Rockwell hardness tester advantages are:
1. because Rockwell hardness tester have a hard and two soft head, it is adapted to test a variety of different hard materials, there is no pressure head deformation;
2. small indentation, not to hurt the surface;
3. rapid operation, immediately obtained data, high production efficiency, suitable for mass production of the finished product testing.
With different hardness level measured hardness value cannot unify ,can not be compared. Rockwell hardness value on the provisions of the production in the most used is A-class, B-class and C-class, namely the HRA, HRB and HRC, and among which the most commonly HRC. Because Rockwell hardness tester is the indentation depth t pouch as an index measure hardness values. At the same hardness level, the more hard metal indentation depth t is smaller, the more flexible the t greater. If directly with the size of the t as indicators, there will be a small hard metal t value and hardness values, the t value of soft metal hardness value is big to the phenomenon of large, this and brinell hardness value represented by the hardness of the concept of size, also do not match the habits of people. For this reason, only a last resort to take measures, namely with the selected constant minus the t values to mark its difference Rockwell hardness values. This constant provision of 0.2mm and 0.26mm. Rockwell hardness of the indenter divided in two soft and hard. Hard by the apex angle of 120 ° diamond cone into the system, suitable for measuring harder hardening steel and other metal materials; soft diameter 1/16 "or 1/8" steel ball, suitable for annealing Determination of steel, nonferrous metals and other softer material hardness values. Rockwell hardness of the applied load is tested according to hard and soft metal itself differently ranging provisions with different indenter and the applied loads with different titles appeared in a variety of Rockwell hardness level.
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