A Slip-Line Field for Ploughing During Orthogonal Cutting
A Slip-Line Field for Ploughing During Orthogonal Cutting
复制标题
DOI：
10.1115/1.2830208
复制
发表时间：
1997-11
期刊：
影响因子：
--
通讯作者：
D. Waldorf;R. DeVor;S. Kapoor
中科院分区：
文献类型：
--
作者：
D. Waldorf;R. DeVor;S. Kapoor
在正常加工条件下，切削力主要是由于工件材料在一个称为剪切区的狭窄区域内的整体剪切所致。然而，在精加工条件下，当未切削切屑厚度与切削刃半径处于同一数量级时，与剪切力相比，力的犁削分量变得显著。在这些条件下预测力需要对犁削进行估算。构建了一个滑移线场来模拟切削力的犁削分量。该场基于为刚性楔在半空间上滑动以及负前角正交切削所构建的其他滑移线场。它包含了观察到的附着在刃口的材料有小的稳定堆积以及在刃口前方形成凸起的材料前端的现象。该模型表明犁削力如何与刀具刃口半径相关——较大的刃口会导致较大的犁削力。使用具有不同刃口半径（包括一些尺寸夸大的）以及不同未切削切屑厚度水平的刀具，对6061 - T6铝合金进行了一系列实验。所得的力的测量结果与使用所提出的滑移线场的预测结果吻合良好。这些结果对于理解和量化刃口半径和磨损刀具对切削力的影响具有很大的前景。
Under normal machining conditions, the cutting forces are primarily due to the bulk shearing of the workpiece material in a narrow zone called the shear zone. However, under finishing conditions, when the uncut chip thickness is of the order of the cutting edge radius, a ploughing component of the forces becomes significant as compared to the shear forces. Predicting forces under these conditions requires an estimate of ploughing. A slip-line field is developed to model the ploughing components of the cutting force. The field is based on other slip-line fields developed for a rigid wedge sliding on a half-space and for negative rake angle orthogonal cutting. It incorporates the observed phenomena of a small stable build-up of material adhered to the edge and a raised prow of material formed ahead of the edge. The model shows how ploughing forces are related to cutter edge radius — a larger edge causing larger ploughing forces. A series of experiments were run on 6061-T6 aluminum using tools with different edge radii — including some exaggerated in size – and different levels of uncut chip thickness. Resulting force measurements match well to predictions using the proposed slip-line field. The results show great promise for understanding and quantifying the effects of edge radius and worn tool on cutting forces.