切削工具寿命の解析的予測に関する研究-3-逃げ面摩耗痕の形状と応力状態 [in Japanese] Study on Analytical Prediction of Cutting Tool Life (3rd Report) : Shape of Flank Wear Surface and its Stress State [in Japanese]
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切削工具の逃げ面摩耗痕と仕上面の接触が弾性的か塑性的かについては従来多くの論議がなされて来た.本論文は, 振動が無視できる安定切削状態では接触が弾性的であることを, すくい面応力分布と摩耗痕の平均応力の実測結果に基づいて主張している.有限要素法による理論解析と実験的解析から, 摩耗痕は切削速度方向に平坦ではなく, 無摩耗の工具による仕上面の弾性回復曲線に近い形状をもつことが示されている.この形状の摩耗痕がわずかに仕上面に押し込まれた状態で切削が行われるため, 摩耗面応力が生ずる.摩耗痕上の摩耗速度は一様でなければならず, 摩耗速度が一様になるように摩耗痕形状と押込み量が与えられ, これに応じて応力分布, 温度分布が定まるとしている.この考え方と逃げ面摩耗の摩耗特性式, 切れ刃稜近傍の摩擦応力の特性を併用し, 摩耗痕上の応力分布と温度分布, 摩耗速度を解析的に求める手法を提案している.
Whether the contact between flank wear of cutting tool and finished surface is elastic or plastic has been discussed hitherto by many workers. The paper stresses that the contact is elastic in steady cutting with negligible vibration excepting the vicinity of the cutting edge, based upon the stress distributions on the rake face and the mean stresses on the flank wear which were obtained experimentally. Through specially designed FEM and experimental analyses, it is revealed that the worn surface is not flat in the direction of cutting speed, but has a similar shape to the elastic recovery curve of the finished surface produced with a sharp tool. The curved worn surface is so located as to depress slightly the finished surface during cutting, thus the elastic stresses are produced. Since the wear rate distribution must be uniform on the flank wear in order to maintain its almost flat shape, the detailed curved shape, and thus the stress and temperature distributions appear to be so determined as to realize the uniform wear rate. Based upon this concept, an analytical method to predict the distributions of the stress and the temperature, and the wear rate as well is proposed, in which the flank wear characteristic and the frictional stress conditions around the cutting edge are taken into account.
- Journal of the Japan Society of Precision Engineering
Journal of the Japan Society of Precision Engineering 48(9), p1231-1237, 1982-09
The Japan Society for Precision Engineering