ショアかたさ試験機の指示の変動と精度の統計的管理

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  • The Stability of Shore Hardness Testers and the Maintenance of their Accuracy on a Statistical Basis
  • ショア カタサ シケンキ ノ シジ ノ ヘンドウ ト セイド ノ トウケイテキ カンリ

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The variation of the indications of commercial Shore hardness testers is investigated by replicating the tests on particular specimens periodically. The results show that the observed variation is composed of a long-term variation, a day-to-day variation and a variation within repeats. Then a factorial experiment is made to determine the contributions of such factors as the testing conditions, the operating way of testers, the local variation of hardness in specimens and random errors to the total variation. It is disclosed that hardness values are influenced by the ambient temperature. Finally, a most effective procedure to maintain a constant hardness scale on the basis of a given standard is discussed and a method of obtaining a better accuracy than 0.6 Hs over four years with a commercial tester is developed.

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