During the operation, the error of the test force includes errors of the initial test force and the main test force, as well as errors of uneven test force. If the initial test force is too large, the hardness value will be high, the total test force will be large, and the hardness value will be small. If the hardness value is low, the impact will be obvious.
Errors will occur when the axial direction of the indenter is deformed or displaced. The elastic deformation and axial displacement of the lifting screw, the elastic deformation and elastic aftereffects of the frame, and poor tightness between the pattern support surface and the test table surface will all affect the inspection. As a result, when the hardness is affected by poor installation contact of the indenter, it is necessary to use the shoulder of the indenter to closely fit the bottom end surface of the spindle.
Error of initial measurement mechanism.
The influence of speed during the application of test force. It should be applied smoothly to avoid vibration and impact.
Errors caused by the quality of the indenter and errors caused by wear and tear. This is the most common in the industry. The gold test hardness tester has been strengthened in this regard. It uses an all-natural diamond indenter and advanced technology. The impact in this area is basically reduced to zero. Many users call specifically to purchase the gold testing diamond indenter RC-3A after using it. Check whether the diamond indenter is qualified and give friends some suggestions for selection, including the geometric shape deviation of the diamond indenter and the smoothness of the surface. Whether the diamond cone inlay is correct or not, the welding firmness and the choice of crystallization direction. Ball indenter includes diameter deviation, ovality, surface roughness and hardness and quality issues of the ball itself.
The influence of the duration of the total test force during operation. The longer the duration, the lower the hardness.
The influence of temperature during the process. The higher the temperature, the lower the hardness value produced. When the temperature changes by 10 degrees, the influence is between 0.1~0.1HRC.
Finally, there is the influence of the test piece, including the smoothness, parallelism, surface roughness, thickness, rust, dirty oil, foreign matter, etc. of the test piece.
