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AA7075-T651 正交干式加工引起的表面光洁度和残余应力

Surface Finish and Residual Stresses Induced by Orthogonal Dry Machining of AA7075-T651.

作者信息

Jomaa Walid, Songmene Victor, Bocher Philippe

机构信息

Aluminum Research Centre (REGAL) and École de technologie supérieure (ÉTS), Département mécanique, 1100 rue Notre-Dame Ouest, Montréal, QC H3C 1K3, Canada.

出版信息

Materials (Basel). 2014 Feb 28;7(3):1603-1624. doi: 10.3390/ma7031603.

DOI:10.3390/ma7031603
PMID:28788534
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5453293/
Abstract

The surface finish was extensively studied in usual machining processes (turning, milling, and drilling). For these processes, the surface finish is strongly influenced by the cutting feed and the tool nose radius. However, a basic understanding of tool/surface finish interaction and residual stress generation has been lacking. This paper aims to investigate the surface finish and residual stresses under the orthogonal cutting since it can provide this information by avoiding the effect of the tool nose radius. The orthogonal machining of AA7075-T651 alloy through a series of cutting experiments was performed under dry conditions. Surface finish was studied using height and amplitude distribution roughness parameters. SEM and EDS were used to analyze surface damage and built-up edge (BUE) formation. An analysis of the surface topography showed that the surface roughness was sensitive to changes in cutting parameters. It was found that the formation of BUE and the interaction between the tool edge and the iron-rich intermetallic particles play a determinant role in controlling the surface finish during dry orthogonal machining of the AA7075-T651 alloy. Hoop stress was predominantly compressive on the surface and tended to be tensile with increased cutting speed. The reverse occurred for the surface axial stress. The smaller the cutting feed, the greater is the effect of cutting speed on both axial and hoop stresses. By controlling the cutting speed and feed, it is possible to generate a benchmark residual stress state and good surface finish using dry machining.

摘要

在常规加工工艺（车削、铣削和钻孔）中，对表面光洁度进行了广泛研究。对于这些工艺，表面光洁度受切削进给量和刀尖半径的影响很大。然而，一直缺乏对刀具/表面光洁度相互作用以及残余应力产生的基本认识。本文旨在研究正交切削下的表面光洁度和残余应力，因为它可以通过避免刀尖半径的影响来提供这些信息。在干燥条件下，通过一系列切削实验对AA7075-T651合金进行了正交加工。使用高度和幅度分布粗糙度参数研究表面光洁度。采用扫描电子显微镜（SEM）和能谱仪（EDS）分析表面损伤和积屑瘤（BUE）的形成。对表面形貌的分析表明，表面粗糙度对切削参数的变化很敏感。研究发现，在AA7075-T651合金的干式正交加工过程中，积屑瘤的形成以及刀具刃口与富铁金属间化合物颗粒之间的相互作用在控制表面光洁度方面起决定性作用。环向应力在表面上主要为压缩应力，并且随着切削速度的增加趋于拉伸应力。表面轴向应力则相反。切削进给量越小，切削速度对轴向应力和环向应力的影响就越大。通过控制切削速度和进给量，采用干式加工有可能产生基准残余应力状态并获得良好的表面光洁度。

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