新しい測定方式によるロックウェルかたさの提唱

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  • On the New Measuring Method with Rockwell Hardnesses
  • アタラシイ ソクテイ ホウシキ ニ ヨル ロックウェル カタサ ノ テイショウ

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The author has proposed the new measuring method with Rockwell hardness which is measured by indenter with a conical angle different from 120° or by the larger initial load than 10 kg. The conversion formulae between these hardnesses and Vickers hardness Hv and the equations of errors were induced theoretically and checked experimentally. These new hardnesses have many merits. For examples, using the 1arger conical angle than 120°, the hardness range of 60<Hv<1000 can be expressed by a single indenter continuously and the thin sheets are measured without employing special superficial tester. The smaller conical angle than 120° is effective to raise the sensitiveness of measurement for very hard specimens. For rough surfaces, we can get the reliable results which have very small scattering ranges by larger initial load.

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