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Study of the local forces along a drill edge – comparison of two methodologies

机译:研究沿钻头边缘的局部力–两种方法的比较

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摘要

In aerospace applications, drilling is one of the most common operations. However, this machining stays complex and expensive, especially in hard to cut materials. Because of the closed aspect of the operation, the measure or evaluation of the phenomenon on the cutting area is difficult, especially decomposing the forces for various parts of the edge. This study focuses on two methodologies allowing a study of the forces along the drill’s edge.The first methodology is based on a physical decomposition of the drill edge. This approach, like the following one, is based on the hypothesis of the independency of the segments: each part of the edge is cutting the material independently from its neighbors (for the chip flow or the local forces). By measuring the forces on the drilling of samples of various external diameters, smaller or bigger than the drill diameter, and with or without pilot hole, the reconstruction of the forces along the drill edge and on the margin could be done.The second methodology, still based on the hypothesis of the independency of the segments, decomposes the forces during the drill point sinking on the material. On each entry altitude, the drill edge engagement is known, allowing the recomposition of the forces along the edge and on the margin.Experiments have been done to compare the two methodologies with one drill and one batch of Ti6Al4V alloy.
机译:在航空航天应用中,钻孔是最常见的操作之一。但是,这种加工仍然很复杂且昂贵,特别是在难切削的材料中。由于操作是封闭的,因此难以对切割区域上的现象进行测量或评估,尤其是要分解边缘各部分的力。这项研究的重点是两种方法,可以研究沿钻头边缘的力。第一种方法是基于钻头边缘的物理分解。像下面的方法一样,这种方法基于片段独立性的假设:边缘的每个部分都在独立于其相邻元素切割切削材料(对于切屑流或局部力)。通过测量在各种外径的样品上钻孔的力,该外径小于或大于钻孔直径,并带有或不带有导向孔,可以完成沿钻头边缘和边缘的力重构。仍然基于分段独立性的假设,分解钻点下沉到材料上时的力。在每种进入高度下,钻头的刃口啮合都是已知的,从而可以沿刃口和边缘重新组合力。已经进行了实验,将两种方法与一个钻头和一批Ti6Al4V合金进行了比较。

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