...Furthermore, if the friction angle β (=tan -1 μ) is used, then F = N ・tanβ. When the friction angle β of the rake face is smaller than the rake angle α (β < α), the direction of the cutting force R is downward from the cutting direction, and the tool is pulled into the product during cutting, cutting deeper than the intended cutting thickness, a phenomenon known as "bite-in." It is common to make α smaller by holding the knife vertically when sharpening a pencil lead. ... *The following is a partial explanation of terms that refer to the "bite-in phenomenon." Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…また,摩擦角β(=tan-1μ)を用いればF=N・tanβである。すくい面の摩擦角βがすくい角αより小さい場合(β<α)は,切削力Rの方向は切削方向よりも下向きとなり,切削に際し工具は製品の中に引きずりこまれ,予定切削厚さよりも深く削る,いわゆるくい込み現象が起こる。鉛筆の芯を削るときナイフをたてαを小さくすることはよく経験することである。… ※「くい込み現象」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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