DIRECT VERIFICATION AND CALIBRATION OF ROCKWELL DIAMOND CONE INDENTERS
Satoshi Takagi, Hjime Ishida, Takashi Usuda, Haruo Kawachi, Kazutomi Hanaki
Abstract:
The direct verification and the calibration of Rockwell diamond cone indenters in NMLT and JBI are described. Developed instrument 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 testing conditions. The results show that the effect of indenters are 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.
Keywords:
Rockwell diamond cone indenter, Multiple regression, Analysis of variance
Download:
IMEKO-TC5-2004-023.pdf
DOI:
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Event details
IMEKO TC:
TC5
Event name:
Hardness Measurements Theory and Application in Laboratories and Industries
Title:
9th HARDMEKO 2004
Place:
Washington, DC, USA
Time:
11 November 2004 - 12 November 2004
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