ボールエンドミル切削における切りくず生成状態と切削抵抗の予測(第2報) : 計算結果と実験結果との比較検討および幾何的相似性に基づく切削抵抗の予測

概要

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In the 1st part of this investigation, a cutting model and energy method developed for the drilling, in which the condition of side-curl of the chip is considered, has been extended to the milling with ball end mills. In this paper, three conponents of the cutting force and the chip formation such as radius of side-curl and shear angle are measured, and compared with those through theoretical prediction. Therefore the predicted results are good agreement with the experimental results. Then, geometrical similarity conditions for relating ball and mills of various diameters are discussed. In the milling with similar ball end mills, shape of the cutting cross-section at any rotational angle of the cutter also becomes similar, when both ratios of feed to tool diameter and depth of cut to that are held in constant. Furthermore, it is confirmed that the relationships between cutting forces and square of tool diameter, and between side-curl of the chip and tool diameter become linear respectively, when the similarity conditions are satisfied. Using the geometric similarity and a few data with respect to the cutting forces, any other cutting forces for ball end mills of various diameters can be easily estimated.
2003-04-05