Abstract

Under the influence of a high-speed, interrupted-cutting impact load, the damage degree quickly increases following any structural damage in a milling cutter. The presence of structural damage must be explored given the fact that these conditions may result in irreparable and serious accidents if not immediately detected. Milling cutter damage has multi-scale characteristics. Therefore, the single-scale damage research method cannot reveal the formation and evolution of the multi-scale damage of a milling cutter, which makes it difficult to identify and control the damage of a milling cutter. The damage scales of a milling cutter are divided according to the multi-scale characteristics of milling cutter damage. Based on continuum mechanics, the dislocation theory, and molecular dynamics, the damage characterization method of the macrostructure, lattice structure, and mesoscopic structure of a milling cutter were proposed in this study. Utilizing the multi-scale finite element method and the force connection method, the loading boundary conditions of the multi-scale damage of a milling cutter were established in order to achieve a trans-scale load transfer. The damage characteristics of the macrostructure, lattice structure, and mesoscopic structure of the milling cutter were studied, and the critical value of the multi-scale damage characteristic variable of the milling cutter was obtained. Thereby, the damage position, types, and size and damage occurrence sequences of the milling cutter were revealed, and the damage formation process and the characteristics of the milling cutter were clarified. Based on this, a method for recognizing the multi-scale damage in a milling cutter was proposed and verified by experiments. The results showed that the above method could effectively identify multi-scale damage characteristics and reveal the formation and evolution process of the damage of a high-efficiency milling cutter.

中文翻译：

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高效铣刀损伤识别的多尺度方法

摘要

在高速，间断切削冲击载荷的影响下，铣刀中的任何结构损坏都会使损坏程度迅速增加。考虑到这些条件如果不立即发现可能会导致无法弥补的严重事故，因此必须探讨是否存在结构损坏。铣刀损坏具有多尺度特征。因此，单尺度损伤研究方法无法揭示铣刀多尺度损伤的形成和发展，难以识别和控制铣刀的损伤。根据铣刀损伤的多尺度特征，将铣刀的损伤尺度进行划分。基于连续力学，位错理论和分子动力学，宏观结构的损伤表征方法，提出了铣刀的晶格结构和介观结构。利用多尺度有限元法和力连接法，建立了铣刀多尺度损伤的载荷边界条件，以实现跨尺度的载荷传递。研究了铣刀宏观结构，晶格结构和介观结构的损伤特性，得出了铣刀多尺度损伤特性变量的临界值。从而揭示了铣刀的损坏位置，类型，大小和损坏发生的顺序，并阐明了铣刀的损伤形成过程和特性。基于此，提出了一种识别铣刀多尺度损伤的方法，并通过实验进行了验证。结果表明，上述方法可以有效地识别多尺度损伤特征，揭示了高效铣刀损伤的形成和演化过程。