1,721,095 research outputs found
EURAMET supplementary comparison between INRiM and UME in Rockwell hardness scales (HRA - HRBW - HRC) - EURAMET.M.H-S1.a.b.c
Full text linkThis report describes a bilateral EURAMET Supplementary Comparison on Rockwell hardness scales of two national metrology institutes of Italy and Turkey, INRiM and UME, respectively. The pilot laboratory is INRiM in the comparison where three sets of hardness reference blocks for the Rockwell Hardness scales of HRA, HRBW and HRC were used. Each set of blocks consists of four hardness reference blocks for HRA and HRBW and five blocks for HRC hardness scales. The comparison was realized as planned in the Technical Protocol with some delay. The measurement results and uncertainty assessments declared by INRiM and UME are in consistency with each other
A suitable geometrical model for the verification of Knoop indenters with Gal-Indent optical system
Full text linkISO 4545-2 and 4545-3 of Knoop hardness tests require the geometrical verification of the indenter. INRiM hardness laboratory developed a specific measuring system, commercialized by Galileo-LTF as Gal-Indent optical system, which is used for the verification of Vickers indenters. This system is able to measure the vertex angles of the indenter between two opposite faces, and the four quadrilateral base angles. Using such quantities as inputs of a suitable geometrical model, the geometry of Knoop indenters can be verified. This work deals with the description of the system and the geometrical model
Bilateral comparison in Rockwell C hardness scale between INRiM and GUM
Full text linkThis bilateral comparison in HRC is conducted in order to confirm the accuracy claimed by National Institute of Metrological Research in Italy (INRiM) and Central Office of Measures in Poland (GUM). Also, this study compares the difference of measurement results between two modernized deadweight-type Rockwell's hardness standard machines (HSMs) from GUM and primary hardness standard machine (PHSM) from INRiM. The hardness blocks of about 20 HRC, 35 HRC, 45 HRC, 50 HRC, 60 HRC and 65 HRC, which all have uniformity less then ±0.4 HRC according to EN ISO 6508-3, were used in this comparison
NEW POSSIBILITIES IN THE GEOMETRICAL CALIBRATION OF DIAMOND INDENTERS
No full textThe influence of Rockwell and Vickers diamond indenters geometry in hardness measurements justifies the strict specifications and tolerances in the relative standards. Many methods, and consequently dedicated instruments, have been developed to investigate the geometrical parameters in order to calibrate the diamond indenters. Most of them, using contact or contactless methods, can only investigate some profiles of the indenters; from these partial measurements the whole geometry is derived. Few other instruments can investigate the Whole shape but, since they are custom-developed, costs and difficulties in the calibration of these instruments have limited their use.
A new method is proposed in this paper using a commercial and not dedicated instrument: a 3D measuring confocal microscope. This type of instrument have also the advantage that the whole geometry is analyzed with a consequently knowledge improvement in the indenter
calibration.
In the paper the measurement method, the used instrument and its calibration to assure traceability to the length and angle standards are investigated
Verification of Knoop indenters with a Vickers-addressed optical system
No full textISO 4545-2 and 4545-3 of Knoop hardness tests require the geometrical verification of the indenters. INRiM hardness laboratory, in cooperation with Galileo-LTF®, has developed the Gal-Indent optical measuring system for the verification of Vickers indenters. This system can measure the vertex angles between two opposite faces, the quadrilateral base angles and the pyramid axis tilt angle. Using these measured quantities as inputs of a suitable geometrical model, the angles between the opposite edges at the vertex of Knoop indenters, nominally 172.5° and 130°, and the angle between the pyramid and indenter holder axes can be verified with an expanded uncertainty of 0.05°. Comparison of experimental measurements performed on three different Knoop indenters, previously verified by an accredited laboratory, shows compatible results. The proposed geometrical model could be easily implemented by laboratories that adopt similar measuring systems addressed for the verification of Vickers indenters without any modification of the experimental apparatus
Metrological characterization of the Gal-Indent Measuring Systems realised by LTF for VNIIFTRI (Russia)
No full textThe work consists in the metrological characterization of the Gal-Indent Measuring Systems realized by LFT Spa for VNIIFTRI (Russia). The work described in the report was carried out in September 2009, by the Istituto Nazionale di Ricerca Metrologica (INRIM) of Italy at LTF laboratory in Antegnate (BG), Italy.
Metrological characterizations consist in the indirect verification of the measuring system through a comparison with the INRIM Measuring System.
Results have been compared with technical specifications of Measuring Systems to verify the quality of LTF realization
Metrological characterization of the Gal-Indent Measuring System realised by LTF Spa for INMETRO (Brazil)
No full textThe work consists in the metrological characterization of the Gal-Indent Measuring Systems realized by LFT Spa for the INMETRO (Brazil). The work described in the report was carried out by the Istituto Nazionale di Ricerca Metrologica (INRIM) (formerly Istituto di Metrologia “G. Colonnetti” of the Consiglio Nazionale delle Ricerche (IMGC-CNR)), as part of the work specified in the Annex A, rev. 2, of the Contract nr. 02/05 in date 10/02/2005 between LTF and IMGC-CNR.
Metrological characterizations consist in the direct and indirect verification of the measuring system. In the direct verification, main parameters are verified; in the indirect verification, a comparison of the whole performances of measuring system are verified through a comparison with INRIM Measuring System.
Results have been compared with technical specifications of Measuring Systems to verify the quality of LTF realization
Metrological characterization of the Gal-Indent and Gal-Vision Measuring Systems realised by LTF for NIST (USA)
No full textThe work consists in the metrological characterization of the Gal-Indent and Gal-Vision
Measuring Systems realized by LFT Spa for NIST (USA). The work described in the
report was carried out in February 2008, by the Istituto Nazionale di Ricerca
Metrologica (INRIM) of Italy (formerly Istituto di Metrologia "G. Colonnetti" (IMGC)
of the National Research Council (CNR)) at LTF laboratory in Antegnate (BG), Italy.
Metrological characterizations consist in the direct and indirect verification of the
measuring system. In the direct verification, main parameters are verified; in the
indirect verification, a comparison of the whole performances of measuring systems are
verified through a comparison with INRIM Measuring Systems.
Results have been compared with technical specifications of Measuring Systems to
verify the quality of LTF realization
Metrological characterization of the Primary Hardness Standard machine realized by LTF for Biroul Roman de metrologie legala (BRML) (Romania)
No full textThe work consists in the metrological characterization of the Primary Hardness Standard Machine (PHS Machine) realized by LTF S.p.A. for the Biroul Roman de Metrologie Legala (BRML), in Romania. The work described in the report was carried out in February 2009, by the Istituto Nazionale di Ricerca Metrologica (INRIM) of Italy (formerly Istituto di Metrologia "G. Colonnetti" (IMGC) of the National Research Council (CNR)) at LTF laboratory in Antegnate (BG), Italy. PHS Machine has been realized by LTF with the INRIM know-how. The metrological characterizations consists in the indirect verification of the PHS machine thought the comparison of the hardness scales generated by the PHS machine with the national scales maintained by INRIM
Comparison of Hardness Scales between the INRIM Primary Hardness Standard Machine and the AFFRI Master Rockwell and Vickers Reference Hardness Standard Machines for SIMT (Shanghai-China)
No full textThe work consists in the comparison of Vickers, Brinell and Rockwell Hardness Scales realized by the INRIM Primary Hardness Standard Machine (PHS Machine) and the Affri Master Rock and Affri Master Vick Reference Hardness Standard Machines (RHS Machines) for SIMT, Shanghai, China. The work described in the report was carried out in February and March 2007, by the Istituto Nazionale di Ricerca Metrologica (INRIM) of Italy (formerly Istituto di Metrologia "G. Colonnetti" (IMGC) of the National Research Council (CNR)) at AFFRI Laboratory in Induno Olona (VA), Italy.
The comparison of the hardness scales generated by the RHS machines with the national scales maintained by INRIM gives an indication of the whole performances of RHS machines and measuring system
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