Scholarlink

<p>7050 aluminum alloy is widely used in critical aerospace components due to its high strength and toughness, but during processing, it is prone to forming built-up edges induced by high ductility and thermoplastic instability, leading to severe periodic vibrations and deterioration of surface quality. To address this industrial problem, this study proposes a synergistic machining approach combining micro-textured tools and cryogenic cutting (CT). This paper systematically analyzes the characteristics of serrated chips, the microstructural evolution of adiabatic shear bands (ASB), and surface integrity by comparing conventional machining (CM) and micro-textured machining (MTM) under both room and cryogenic conditions. The results show that micro-textured tools reduce serration by 25% at 40&#xa0;m/min by optimizing the tool–chip interface contact characteristics. In a cryogenic environment, liquid nitrogen induces a low-temperature embrittlement effect in the material by suppressing thermally activated processes such as dislocation slip, climb, and dynamic recovery. Experiments found that cryogenic micro-textured machining (CT-MTM) increased the hardness of the ASB region by 2.5% compared to the matrix, and a further 5.5% increase compared to the MTM group, while the machined surface roughness was significantly reduced by 34.7%. This study shows that the synergistic effect of deep cryogenic treatment and micro-texture can effectively suppress thermal softening and enhance the degree of shear localization, providing important theoretical support and engineering guidance for the high-quality processing of complex thin-walled aerospace components.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Investigation of Serrated Chip Formation and Surface Roughness of 7050 Aluminum Alloy Processed by Cryogenic Cutting with Micro-Textured Tools

  • 期刊论文

  • 发表日期：

    2026年7月20日

查看全文
  • Shaobin Ma,
  • Xiaolong Yin,
  • Yawei Wu,
  • Zhenbo Zhu,
  • Enchen Ge,
  • Minghui Yang,
  • Xiaomeng Zhu

摘要

7050 aluminum alloy is widely used in critical aerospace components due to its high strength and toughness, but during processing, it is prone to forming built-up edges induced by high ductility and thermoplastic instability, leading to severe periodic vibrations and deterioration of surface quality. To address this industrial problem, this study proposes a synergistic machining approach combining micro-textured tools and cryogenic cutting (CT). This paper systematically analyzes the characteristics of serrated chips, the microstructural evolution of adiabatic shear bands (ASB), and surface integrity by comparing conventional machining (CM) and micro-textured machining (MTM) under both room and cryogenic conditions. The results show that micro-textured tools reduce serration by 25% at 40 m/min by optimizing the tool–chip interface contact characteristics. In a cryogenic environment, liquid nitrogen induces a low-temperature embrittlement effect in the material by suppressing thermally activated processes such as dislocation slip, climb, and dynamic recovery. Experiments found that cryogenic micro-textured machining (CT-MTM) increased the hardness of the ASB region by 2.5% compared to the matrix, and a further 5.5% increase compared to the MTM group, while the machined surface roughness was significantly reduced by 34.7%. This study shows that the synergistic effect of deep cryogenic treatment and micro-texture can effectively suppress thermal softening and enhance the degree of shear localization, providing important theoretical support and engineering guidance for the high-quality processing of complex thin-walled aerospace components.