低かたさショアかたさ目盛の基準

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  • Standardization of Shore Hardness Scale for Soft Metals
  • テイ カタサ ショア カタサ メモリ ノ キジュン

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A study is made on the standardization of Shore hardness scale below 30 by using a number of Shore hardness testers of various types, which, above 30, agree with the standard of JIS, set in terms of the conversion from Vickers hardness. As the result of extensive experiments on various soft metals, it is found that annealed mild steel with C of 0.13 to 0.31% (Hs ≅ 17∼22) and pure copper Of 99.8% or better (Hs ≅ 7) exhibit a well coincident Vickers-Shore relationship with the extension of the conversion formula prescribed in JIS. The use of standard hardness blocks made of these materials for the calibration of Shore hardness testers proves the possibility of standardizing Shore hardness scale below 30 as accurately as that above 30.

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