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Al6061-T651合金钻孔过程中切削刀具涂层对表面粗糙度和孔尺寸公差的影响评估

Evaluation of Cutting-Tool Coating on the Surface Roughness and Hole Dimensional Tolerances during Drilling of Al6061-T651 Alloy.

作者信息

Al-Tameemi Hamza A, Al-Dulaimi Thamir, Awe Michael Oluwatobiloba, Sharma Shubham, Pimenov Danil Yurievich, Koklu Ugur, Giasin Khaled

机构信息

Mechanical Engineering Department, University of Baghdad, Baghdad Al-Jadriya 10070, Iraq.

22a, Guinness Road, Ogba/Ikeja, Lagos, Nigeria.

出版信息

Materials (Basel). 2021 Apr 4;14(7):1783. doi: 10.3390/ma14071783.

DOI:10.3390/ma14071783
PMID:33916557
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8038506/
Abstract

Aluminum alloys are soft and have low melting temperatures; therefore, machining them often results in cut material fusing to the cutting tool due to heat and friction, and thus lowering the hole quality. A good practice is to use coated cutting tools to overcome such issues and maintain good hole quality. Therefore, the current study investigates the effect of cutting parameters (spindle speed and feed rate) and three types of cutting-tool coating (TiN/TiAlN, TiAlN, and TiN) on the surface finish, form, and dimensional tolerances of holes drilled in Al6061-T651 alloy. The study employed statistical design of experiments and ANOVA (analysis of variance) to evaluate the contribution of each of the input parameters on the measured hole-quality outputs (surface-roughness metrics and , hole size, circularity, perpendicularity, and cylindricity). The highest surface roughness occurred when using TiN-coated tools. All holes in this study were oversized regardless of the tool coating or cutting parameters used. TiN tools, which have a lower coating hardness, gave lower hole circularity at the entry and higher cylindricity, while TiN/TiAlN and TiAlN seemed to be more effective in reducing hole particularity when drilling at higher spindle speeds. Finally, optical microscopes revealed that a built-up edge and adhesions were most likely to form on TiN-coated tools due to TiN's chemical affinity and low oxidation temperature compared to the TiN/TiAlN and TiAlN coatings.

摘要

铝合金质地柔软，熔点较低；因此，对其进行加工时，由于热量和摩擦，被切削材料往往会与切削刀具熔合，从而降低孔的质量。一种好的做法是使用涂层切削刀具来克服此类问题并保持良好的孔质量。因此，当前的研究调查了切削参数（主轴转速和进给速度）以及三种类型的切削刀具涂层（TiN/TiAlN、TiAlN和TiN）对在Al6061-T651合金上钻出的孔的表面光洁度、形状和尺寸公差的影响。该研究采用实验设计和方差分析（ANOVA）来评估每个输入参数对测量的孔质量输出（表面粗糙度指标 和 、孔径、圆度、垂直度和圆柱度）的贡献。使用TiN涂层刀具时表面粗糙度最高。本研究中的所有孔均出现尺寸过大的情况，无论使用何种刀具涂层或切削参数。涂层硬度较低的TiN刀具在入口处的孔圆度较低，圆柱度较高，而TiN/TiAlN和TiAlN在较高主轴转速下钻孔时似乎在降低孔的不规则度方面更有效。最后，光学显微镜显示，与TiN/TiAlN和TiAlN涂层相比，由于TiN的化学亲和力和较低的氧化温度，在TiN涂层刀具上最容易形成积屑瘤和粘附物。

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