7055铝合金高速加工表面完整性对疲劳寿命的影响

谭靓; 姚倡锋; 张定华

doi:10.13433/j.cnki.1003-8728.2015.0612

7055铝合金高速加工表面完整性对疲劳寿命的影响

doi: 10.13433/j.cnki.1003-8728.2015.0612

1.
西北工业大学现代设计与集成制造技术教育部重点实验室, 西安 710072

基金项目:

国家自然科学基金项目（51005184，51375393）、国家科技重大专项（2013ZX04011031）与航空科学基金项目（2013ZE53060）资助

详细信息

作者简介:
谭靓（1988-），博士研究生，研究方向为难加工材料表面完整性、高速切削，tanliang@mail.nwpu.edu.cn

通讯作者:
姚倡锋，教授，chfyao@nwpu.edu.cn

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- 文章访问数: 160
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- 被引次数: 0
出版历程
- 收稿日期: 2013-10-11
- 刊出日期: 2015-06-05

Influence of the Surface Integrity on the Fatigue Life for High-speed Milling of 7055 Aluminum Alloy

1.
The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, China

摘要

摘要: 为优化高强度铝合金高速铣削工艺参数，提高构件的疲劳寿命，通过高速铣削及疲劳试验，研究了7055铝合金高速铣削工艺参数对表面完整性的影响以及表面完整性对疲劳寿命的影响。结果表明：铣削表面残余应力均呈现为压应力；每齿进给量对表面粗糙度的影响大于铣削速度的影响，铣削速度和每齿进给量对表面显微硬度的影响不显著；7055铝合金试样的疲劳寿命随表面粗糙度增大而降低，随表面残余压应力增大而提高；在试验参数范围内最佳的铣削参数为铣削速度1 100 m/min、每齿进给量0.06 mm/z，试件的表面粗糙度为Ra0.327 μm，表面显微硬度为187.44 HV0.025，表面残余应力为-177.7 MPa，疲劳寿命为1.275×105次。
- 铝合金 /
- 高速铣削 /
- 工艺参数 /
- 表面完整性 /
- 疲劳寿命
Abstract: To optimize the process parameters in the high-speed milling of high strength aluminum alloys, and to improve the fatigue life of components, the effect of the process parameters on the surface integrity and the effect of the surface integrity on the fatigue life were investigated through high-speed milling experiments and fatigue tests of aluminum alloys 7055. The results show that the compressive residual stress can be detected on all the machining surface, the effect of the feed per tooth on the surface roughness is greater than the milling speed, the milling speed and feed per tooth slightly affect the surface micro hardness. The fatigue life decreases with the increasing of the surface roughness, and increases with the increasing of the surface compressive residual stress. Within the experiments limits, the best process parameters are the milling speed of 1 100 m/min, feed per tooth of 0.06 mm/z, and the machining surface roughness is of Ra 0.327 μm, surface micro hardness be of 187.44HV0.025, surface residual stress be of -177.7 MPa, fatigue life be of 1.275×105 cycles.
- aluminum alloys /
- design of experiments /
- experiments /
- fatigue of materials /
- high-speed milling

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