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Towards efficient 5-axis flank CNC machining of free-form surfaces via fitting envelopes of surfaces of revolution

机译:通过配合旋转曲面的包络,实现对自由曲面的高效5轴侧面CNC加工

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摘要

We introduce a new method that approximates free-form surfaces by envelopes of one-parameter motions of surfaces of revolution. In the context of 5-axis computer numerically controlled (CNC) machining, we propose a flank machining methodology which is a preferable scallop-free scenario when the milling tool and the machined free-form surface meet tangentially along a smooth curve. We seek both an optimal shape of the milling tool as well as its optimal path in 3D space and propose an optimization based framework where these entities are the unknowns. We propose two initialization strategies where the first one requires a user's intervention only by setting the initial position of the milling tool while the second one enables to prescribe a preferable tool-path. We present several examples showing that the proposed method recovers exact envelopes, including semi-envelopes and incomplete data, and for general free-form objects it detects envelope sub-patches. (C) 2016 Elsevier Ltd. rights reserved.
机译:我们介绍了一种新方法,该方法通过旋转曲面的单参数运动的包络近似自由曲面。在5轴计算机数控(CNC)加工中,我们提出了一种侧面加工方法,当铣刀和加工后的自由曲面沿平滑曲线相切相交时,这是一种优选的无扇贝加工方案。我们寻求铣刀的最佳形状及其在3D空间中的最佳路径,并提出一种基于优化的框架,其中这些实体是未知的。我们提出了两种初始化策略,其中第一种仅通过设置铣削刀具的初始位置就需要用户干预,而第二种则可以规定一条优选的刀具路径。我们提供了几个示例,表明所提出的方法可以恢复精确的包络,包括半包络和不完整的数据,对于一般的自由格式对象,它可以检测到包络的子补丁。 (C)2016 Elsevier Ltd.版权所有。

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