C. Kuzu, E. Pelit, İ. Meral
INSTALLATION AND METROLOGICAL CHARACTERIZATION OF ROCKWELL-BRINELL-VICKERS HARDNESS STANDARD MACHINE AT TÜBİTAK UME

After successful implementation of two hardness standardizing machines at TSE (Turkish Standards Institution) in Rockwell and Brinell-Vickers hardness scales separately, it is aimed to combine them in a newer design and install in Hardness Laboratory of TÜBİTAK UME (National Metrology Institute of Türkiye). Design of such a national standard was made for Rockwell, Brinell and Vickers hardness scales within the scope of an internally funded project. In this paper installation and metrological characterization of the Rockwell-Brinell-Vickers hardness standard machine (RBVHSM) with dead weight force application system and laser interferometer developed by TÜBİTAK UME Hardness Laboratory is explained in detail.

M. Zackaria, F. Menelao, D. Nimptsch, T. Stegmaier, P. Beisel, P. Reinstaedt, U. Brand, R. Tutsch
UNIVERSAL AUTOMATION APPROACH FOR EFFICIENT CALIBRATION OF ROCKWELL HARDNESS REFERENCE BLOCKS

Hardness reference blocks play a pivotal role in ensuring traceability of hardness measurements. However, it is challenging to calibrate them in accordance with part three of the ISO 6508 without performing time-consuming pre-measurements. Previously, a method was developed and tested at the PTB for the Rockwell scale HRA which used data from the preload phase to automate the calibration process. We now present a novel method that extends the existing automation method to every standardised Rockwell scale. Furthermore, this method is universal in nature and not restricted to PTB’s standardised Rockwell hardness testing machine. Important parameters which pave the way towards the universal automation are addressed. The results of the established characteristic curves are validated by an interlaboratory comparison. This approach accelerates the entire calibration procedure, eliminates the need for an expert user and guarantees a standard-compliant measurement.

S. Takagi, Y. Tanaka, Y. Seino
COMPARISON OF MICROSCOPIC OBSERVATION TECHNIQUES TO DETERMINE VICKERS INDENTATION DIAGONAL LENGTH

In order to investigate the best way to determine the diagonal length of a Vickers indentation, bright-field (BF), dark-field (DF), differential interference contrast (DIC) and confocal scanning microscopy is utilized to observe indentations on various samples. Each of BF, DF and DIC methods has advantage and disadvantage and evaluated values should be considered carefully. 3D feature of indentation evaluated with a confocal microscope gives useful information about it. To eliminate the effect of focusing error, focus stacking technique is quite efficient and expected to reduce the uncertainty of measurement of diagonal length. The roughness of sample surface should be taken into account but not only the amplitude parameter, Ra, but also the wavelength parameter, RSm.

M. Solecki, T. Szumiata, M. Rucki
CONSTRUCTION OF A HYBRID ROBOT INTENDED FOR MASS STANDARD COMPARISON, EQUIPPED WITH A SUSPENDED SELF-CENTRING WEIGHING PAN

The subject of this article is the development of innovative construction solutions as well as the determination of metrological parameters of the robotic mass comparator with 1 µg resolution. The instrument is intended for mass standards from 10 g up to 200 g.
The described construction, being an innovation when compared to other robotic mass comparators, has enabled the use of a suspended self-centring weighing pan, eliminating eccentricity errors.

Sun Qinmi, Li Haibin, Li Xuefei
DERIVATION AND DETERMINATION ANALYSIS OF THE MASS OF STEEL ANVIL USED FOR VERIFYING REBOUND TEST HAMMER

This paper describes the derivation process of steel anvil mass. According to the law of conservation of energy, through the analysis and calculation of impact dynamics in the impact verification process of rebound test hammer, the source of technical indicators of steel anvil for rebound test hammer is pointed out. According to the derivation, the mass of steel anvil is calculated to be 16.1 kg, which is consistent with the mass of steel anvil actually used. The scientific traceability is verified theoretically and practically. It is convenient for the measurement of the relevant indexes of the rebound instrument and the manufacture and use of the standard steel anvil.