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| Development the Primary Standard Machine of the Ball Indentation Hardness |
| LIU Ji-ping1,WANG Jing-tao2,CUI Yuan-yuan1,ZENG Li-min3 |
1. National Institute of Metrology, Beijing 100029, China
2. Laizhou Huayin Testing Instrument Co. Ltd., Laizhou, Shandong 261400, China
3. Zhejiang Province Institute of Metrology, Hangzhou, Zhejiang 310018, China |
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Abstract Derived precision requirements of relative quantities according to the value definition of Boll Indentation hardness, the new primary standard machine is developed. The machine structure and control system design are introduced. The experiment results that the machine is with characters of convenient traceability and great stability,uncertainty of the primary machine is 1.0% (k=2), better than the requirements of JJG2019-1995 Verification Scheme of Measuring Instruments for Plastic Ball Indentation Hardness, can carry out the value transmission in 8.45～467.2HB.
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Received: 19 November 2019
Published: 29 June 2020
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2020, Vol. 41 
