Optimisation of variable helix tool geometry for regenerative chatter mitigation
Optimisation of variable helix tool geometry for regenerative chatter mitigation
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DOI：
10.1016/j.ijmachtools.2010.10.004
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发表时间：
2011-02-01
影响因子：
14
通讯作者：
Sims, Neil D.
中科院分区：
文献类型：
--
作者：
Yusoff, Ahmad R.;Sims, Neil D.
众所周知，再生颤振会导致刀具过度磨损、表面光洁度差，从而限制金属加工过程中的生产率。可以采用各种缓解方法来抑制颤振；然而，本文的重点是应用最佳的可变螺旋刀具几何形状。半离散化方法与微分进化相结合，优化变螺旋端铣刀具，通过修改变螺旋和变螺距刀具几何形状来避免颤振。半离散化方法首先经过实验验证。然后使用数值优化程序来优化涉及柔性工件的加工问题的刀具几何形状。分析预测，使用优化的可变螺旋铣刀在低径向浸入时可完全减轻颤振。然而，实际上，与传统铣削刀具相比，颤振稳定性提高了五倍。 (C) 2010 Elsevier Ltd. 保留所有权利。
It is well known that regenerative chatter can result in excessive tool wear, poor surface finish, and hence limited productivity during metal machining. Various mitigation methods can be applied to suppress chatter; however, the current paper focuses on applying optimal variable helix tool geometry. A semi-discretisation method is combined with Differential Evolution to optimise variable helix end milling tools so as to avoid chatter by modifying the variable helix and variable pitch tool geometry. The semi-discretisation method is first validated experimentally. The numerical optimisation procedure is then used to optimise tool geometry for a machining problem involving a flexible workpiece. The analysis predicted total mitigation of chatter using the optimised variable helix milling tool at a low radial immersion. However, in practice a five fold increase in chatter stability was obtained, compared to the traditional milling tool. (C) 2010 Elsevier Ltd. All rights reserved.