Direct Verification and Calibration of Rockwell Diamond Cone Indenters

摘要

The direct verification and the calibration of Rockwell diamond cone indenters in NMIJ and JBI are described. Developed installment can verify the roundness of the spherical part of the indenters, measure the radius of indenter tip and the cone angle by the optical methods. The regression analysis of the geometry of indenters and hardness value can determine the bias of each indenter in each hardness level. This bias can be used to correct the hardness value. To investigate the availability of the correction of hardness value, the experiments were carried out to analyze the relation between the indenters and other treating conditions. The results show that the effect of indenters is independent with other factors and the correction of hardness values are available. Hardness values were agreed within 0.04 HRC (standard deviation) after the correction is was applied.