ロックウェル・クォータロード硬さ試験について(第1報) : 硬さの相似性の理論と硬さ試験機の製作

概要

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The methods of Rockwell and Rockwell superficial hardness tests have practical advantages of getting the hardness number with a small personal error and of making easily the testing procedure automatic, because the hardness number is directly shown on the indicator. The methods of Rockwell quarter load and Rockwell quarter load superficial hardness tests are proposed in order to apply these advantages to test a small or thin specimen. As compared with .the usual methods, the indenters of half size and a quarter amount of the loads are applied, and then the coefficients of the depth of, indentation in the calculation formulas for hardness number are made twice. Even if the test load is changed, the same Rockwell hardness number is obtained when the indentation is geometrically similar under the condition where the ratio of the load to square amount of the size of the indenter is constant. To confirm this theory of similarity in hardness by experiment, the Rockwell and Rockwell superficial hardness testing machines and respective quarter load machines are produced. The errors of these machines' elements are integrated in HRB or HR 30 T as follows : their algebraic sums are within -0.5-0.3,and the roots of the sum of their squares are lower than 0.3.
公益社団法人精密工学会の論文
1985-02-05