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首页> 外文期刊>International Journal of Production Research >A tool path patching strategy around singular point in 5-axis ball-end milling
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A tool path patching strategy around singular point in 5-axis ball-end milling

机译：五轴球头铣削中围绕奇异点的刀具路径修补策略

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摘要

In 5-axis high-speed milling, large incoherent movements of rotary axes around the singular point are known to be a problem. Correction methods found in the literature deal mostly with the collision that may happen between the tool and the part but not with the feedrate slowdowns which affect surface quality and machining productivity. The method proposed in this paper addresses both geometrical and productivity issues by modifying the tool axes orientation while respecting maximum velocity, acceleration and jerk of the machine tool axes. The aim is to detect these behaviours and replace the considered portion of the tool path by a patch curve respecting kinematical constraints of the machine tool. Compared to previous works, the inserted patch curve is not constrained to pass through the singularity but respect tangential constraints to ensure the monotony of the tool path and is also connected with the rest of the tool path to ensure a continuity up to the third derivative in order to fulfil jerk limitations. For that purpose, the initial articular positions of the rotary axes around the singular point are fitted with B-spline curves, modified and finally discretised for linear interpolation. Experimental investigations on a test part are carried out to show the efficiency of the method in terms of feedrate and surface quality.
机译：在5轴高速铣削中，旋转轴绕奇异点的大不连贯运动是已知的问题。文献中发现的校正方法主要处理刀具与零件之间可能发生的碰撞，但不适用于影响表面质量和加工生产率的进给速度降低。本文提出的方法通过修改刀具轴的方向来解决几何和生产率问题，同时考虑到机床轴的最大速度，加速度和加速度。目的是检测这些行为，并通过考虑机床运动学约束的斑块曲线来替换考虑的刀具路径部分。与先前的作品相比，插入的面片曲线不限于穿过奇异点，而是遵守切向约束以确保刀具路径的单调性，并且还与其余刀具路径相连，以确保直至3阶导数的连续性。为了实现混蛋限制。为此，将旋转轴围绕奇异点的初始关节位置拟合B样条曲线，对其进行修改并最终离散化以进行线性插值。对测试零件进行了实验研究，以显示该方法在进给率和表面质量方面的效率。

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