刃物の刃先先端のミクロ構造と切れ味劣化に関する研究(機械要素,潤滑,工作,生産管理など)

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It has long been believed that the tip of a knife-edge has a single small radius and the radius becomes larger with abrasion during daily use. Recently, for the most popular knife made of SUS 420J2, the authors have found that the tip has two micro-blades (the secondary blades) with a groove between them along the knife-edge and the groove grows and thus its width becomes larger with cutting operations. In this paper, this evidence is confirmed to be true even for the knife of a heat resisting alloy-SUH3 and a high-hardness Zirconia Ceramics, and thus it is concluded that the formation of such groove and its growth is a general phenomenon for almost all knife-edges. For each tested blade, the relationship between the cut piece number of paper (NCP ; the cutting performance) and the repetition number of abrading operation (Nt) is approximately expressed as an exponential relation. Ideas to express the durability of cutting performance (Nt^*), the total cutting performance (TNP) and the feeling of cutting paper (ACP) through the service period are proposed and quantitatively evaluated for the tested materials. It is surprisingly found that even for the brittle Ceramics, the relationship between the groove spread and Nt is almost the same as those for SUS420J2 and SUH3. In comparison with SUH3 and SUS420J2, Zirconia Ceramics has the highest durability Nt^*, the best total cutting performance (TNP) and the best feeling of cutting (ACP). The ratio of the durability, total performance and the feeling of cutting to those of SUS420J2 are 28, 40 and 1.4 for SUH3, and 48, 71 and 1.5 for Zirconia Ceramics, respectively.
社団法人日本機械学会の論文
2004-07-25

刃物の刃先先端のミクロ構造と切れ味劣化に関する研究(機械要素,潤滑,工作,生産管理など)

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