Effects of Various Errors on the Superficial Rockwell Hardness Reading : 2nd Report, Tests Using the Diamond Indenter

概要

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On the superficial Rockwell hardness test which is becoming more popular, the authors have reported the effect of various errors on the T scale hardness reading in the first report. In this report, the effects of errors in the preliminary load W_1 kg, the total load W_2 kg, the tip radius R mm of the diamond indenter and the included angle θ rad. on the N scale hardness reading H_RN are analytically clarified by using the extended Meyer's law and the law of similarity. As an example, the following equation is obtained for a medium hardness specimen (30≦H_R15N≦70), ΔH_R30N={139.2-9.486×10^<-3>(100-H_R30N)^2}ΔR+1.734(65.40-H_R30N)Δθ+0.6656×10^<-3>(100-H_R30N)^2ΔW_1-2.527×10^<-2>(100-H_R30N)ΔW_2 A good agreement is observed between the analytical results and the experimental ones. In addition, the authors' proposal for establishing a tentative JIS (Japanese Industrial Standard) is made.
一般社団法人日本機械学会の論文