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Ra0.327μm,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。
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 of0. 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.
出处
《机械科学与技术》
CSCD
北大核心
2015年第6期872-876,共5页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51005184
51375393)
国家科技重大专项(2013ZX04011031)
航空科学基金项目(2013ZE53060)资助
关键词
铝合金
高速铣削
工艺参数
表面完整性
疲劳寿命
aluminum alloys
design of experiments
experiments
fatigue of materials
high-speed milling
microhardness
milling(machining)
optimization
process parameters
residual stresses
stress concentration
surface integrity
surface roughness
surface topography
three dimensional
