ビッカース基準片についての検討 : 押込硬度の圧こんについて : 第3報

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概要

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• It goes without saying that the material of a standard block for hardness test should not fail to be homogeneous and give the same hardness number regardless the measuring points on the surface of the block, thus the hardness number measured on the block, must always agree with the standard number, which is alotted according to the same standard, independent from time and place. It is desirable, therefore, that we may obtain the reliability of hardness number as a standard by the standard hardness block. A great deal of studies on the standard block have been made, which seems to lead to succeed in manufacturing the standard block to certain extent, but there is still left to be discussed in details about this problem. The author discusses on the Vickers standard block on market in this paper, from the results obtained by the research on depression, especially on the pilling-up. The demestic standard blocks supplied by two makrers (H_v=200〜800) are tested on depression ranging from 1 to 50 kg with subsequent examination of depression by the Ogoshi Surface Roughness Tester on the surface. The results are summarized as follows : (1) Every block shows its homogenuity having no difference in hardness number notwithstanding the measuring points. (2) The degree of piling-up differs according to the makers, but the aspect of piling-up has the same inclination regardless the makers, and there is the highest piling-up at H_v<bne>400. (3) There is no continual relationship between the hardness number measured on each standard block and the degree of each piling-up, and the influence of error on harddness caused by the piling-up is not proportional to the hardness. It seems desirable, therefore, to toke the influence of piling-up into consideration for the standard series of hardness block. (4) And it is necessary that a standard block manufactured shold be of those materials which have less piling or piling to the equal amount at least. (5) We can easily obtain the general aspects of the piling-up by means of the Knoop indentator.

• 社団法人日本材料学会の論文
• 1957-12-15

著者

• 財満 鎭雄

  山梨大学工学部

• 財満 鎮雄

  山梨大学工学部

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