IMPROVED METHODS FOR ACCURATELY CALIBRATING THE 3D GEOMETRIES OF ROCKWELL INDENTERS |
|---|
| Gaoliang Dai, Jian Zhao , Febo Menelao, Konrad Herrmann, Uwe Brand |
- Abstract:
- In this paper an improved method for calibrating the 3D geometry of Rockwell indenters using a metrological stylus profilometer is reported. The measured geometry of the indenter is not only applied to determine the quality of the indenter, but also used for correcting the hardness values for improved hardness measurement accuracy. A method for such a correction has been proposed. A virtual indentation device simulated using finite element method (FEM) has been developed. By applying both the measured and the theoretically ideal indenter geometries in the virtual device, two different hardness values HRCreal and HRCideal are obtained, respectively. The difference between HRCreal and HRCideal stands for the systematic deviation due to the indenter geometry and is used to correct the measured hardness values. Some experiments are carried out on the same group of 6 reference materials with a hardness ranging from 20 HRC to 65 HRC to verify our proposal. The geometries of three Rockwell indenters used are measured and further applied to correct the hardness values. By this correction technique the mean deviation between the three indenters on 6 reference materials could be reduced from 0.11 HRC to 0.03 HRC, indicating the effectiveness of the proposed method.
- Keywords:
- Rockwell indentation, metrological stylus profilometer, correction
- Download:
- IMEKO-TC5-2010-003.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC5
- Event name:
- HARDMEKO 2010
- Title:
- 11th HARDMEKO Conference: HARDMEKO 2010 (together with 21st TC3 Conference on Measurement of Force, Mass and Torque and 2nd TC22 Meeting on Vibration Measurement)
- Place:
- Pattaya, THAILAND
- Time:
- 21 November 2010 - 25 November 2010