PROGRESS IN THE CHARACTERIZATION OF THE GEOMETRY OF ROCKWELL DIAMOND INDENTERS
Gaoliang Dai, Herrmann Konrad, Febo Menelao
Abstract:
In this paper two methods for an improved characterization of the geometry of Rockwell diamond indenters are investigated: The establishment of a group standard of indenters and the derivation of an area function with a nano measuring machine. A group standard of indenters yields better statistical results than the calibration using only one indenter. Further, a group standard of indenters guarantees a higher stability of the Rockwell hardness scales in the case that an indenter is damaged and must be replaced by a new one. The second approach is based on the correction of the hardness test values using the indenter's area function determined by a high accuracy nano measuring machine. The investigation has proven that the range of the hardness deviations of a group of three Rockwell indenters amounting to ca. 0.4 HRC by the application of an area function with corrected hardness values can be further reduced to < 0.2 HRC for the lower hardnesses and to < 0.3 HRC for the higher hardnesses. The mean deviation of HRC values measured by this group of Rockwell indenters has been reduced from 0.11 HRC to 0.06 HRC by using the proposed correction method. In future correction methods for Rockwell diamond indenters usable for all standardized Rockwell hardness scales should be derived.
Keywords:
Rockwell diamond indenter, group standard, indenter area function, stylus profilometer
Download:
IMEKO-WC-2009-TC5-155.pdf
DOI:
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Event details
Event name:
XIX IMEKO World Congress
Title:

Fundamental and Applied Metrology

Place:
Lisbon, PORTUGAL
Time:
06 September 2009 - 11 September 2009
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