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铁基高温合金高速车削中切屑形态与刀具磨损的分形特征

Fractal Characteristics of Chip Morphology and Tool Wear in High-Speed Turning of Iron-Based Super Alloy.

作者信息

Zhang Xu, Zheng Guangming, Cheng Xiang, Xu Rufeng, Zhao Guoyong, Tian Yebing

机构信息

School of Mechanical Engineering, Shandong University of Technology, 266 West Xincun Road, Zibo 255000, China.

出版信息

Materials (Basel). 2020 Feb 24;13(4):1020. doi: 10.3390/ma13041020.

DOI:10.3390/ma13041020
PMID:32102418
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7079632/
Abstract

Considering that iron-based super alloy is a kind of difficult-to-cut material, it is easy to produce work hardening and serious tool wear during machining. Therefore, this work aims to explore the chip change characteristics and tool wear mechanism during the processing of iron-based super alloy, calculate the fractal dimensions of chip morphology and tool wear morphology, and use fractals to analyze their change trend. Meanwhile, a new cutting tool with a super ZX coating is used for a high-speed dry turning experiment. The results indicate that the morphology of the chip is saw-tooth, and its color changes gradually, due to the oxidation reaction. The main wear mechanisms of the tool involve abrasive wear, adhesive wear, oxidation wear, coating spalling, microcracking and chipping. The fractal dimension of the tool wear surface and chip is increased with the improvement of cutting speed. This work investigates the fractal characteristics of chip morphology and tool wear morphology. The fractal dimension changes regularly with the change of tool wear, which plays an important role in predicting this tool wear. It is also provides some guidance for the efficient processing of an iron-based super alloy.

摘要

考虑到铁基高温合金是一种难切削材料，在加工过程中容易产生加工硬化和严重的刀具磨损。因此，本研究旨在探究铁基高温合金加工过程中的切屑变化特征和刀具磨损机理，计算切屑形态和刀具磨损形态的分形维数，并利用分形理论分析其变化趋势。同时，采用一种具有超ZX涂层的新型刀具进行高速干式车削实验。结果表明，切屑形态为锯齿状，由于氧化反应其颜色逐渐变化。刀具的主要磨损机制包括磨粒磨损、粘着磨损、氧化磨损、涂层剥落、微裂纹和崩刃。刀具磨损表面和切屑的分形维数随着切削速度的提高而增大。本研究考察了切屑形态和刀具磨损形态的分形特征。分形维数随刀具磨损的变化而有规律地变化，这对预测刀具磨损具有重要作用。它也为铁基高温合金的高效加工提供了一些指导。

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Ultrasonics. 2018 Mar;84:87-95. doi: 10.1016/j.ultras.2017.10.012. Epub 2017 Oct 16.