7075铝合金弱刚性薄壁特征结构的铣削试验研究

2018-06-15

作者：刘启蒙，许金凯，于化东，于占江，李一全单位：长春理工大学

摘要：通过考察7075铝合金试件的加工变形、残余应力、表面质量及边缘毛刺等试验现象，对薄壁特征结构的铣削加工特性进行试验研究。试验结果表明：在刀具切入与切出处，工件边缘有毛刺与粘屑现象；在同一切削用量下，随着壁厚的减小，薄壁变形逐渐增大；随着切削速度的逐渐增大，各尺寸的薄壁试件变形程度逐渐减小，边缘的毛刺与粘屑状况有所改善，但不能完全根除；随着进给速度的逐渐增大，各尺寸的薄壁试件变形逐渐增大，边缘的毛刺与卷边越明显；随着切削深度逐渐增大，各尺寸的薄壁试件变形逐渐增大，边缘的毛刺越明显；切削用量三要素中的切削深度对薄壁试件变形影响最大。

关键词：弱刚性零件；薄壁特征结构；残余应力

中图分类号：TG501.2；TH161.14；TH161.3文献标志码：A

Experimental Study on Cutting Characteristics of7075 AluminumAlloy Part with Thin Wall

Liu Qimeng，Xu Jinkai，Yu Huadong，Yu Zhanjiang，Li Yiquan

Abstract:Through investigating the deformation，residual stress，surface quality and burrs of the 7075 aluminum alloy specimen，the experimental study on the milling characteristics of thinwalled parts with weak rigidity are carried out.The test results show that there exist burrs and chip adhesion at part edges when milling in and out.Under the same cutting condition，with the decrease of the wall thickness，the deformation increases.With the increase of the cutting speed，the deformation also are decreased，the burrs and chip adhesion are reduced，can′t be completely eradicated.With the increase of the feed rate，the deformation increases，and the burrs and edge rolls become more obvious.With the increase of the cutting depth，the deformation is increased，the burrs become more obvious.Among the three cutting parameters，the deformation can be affected most by the cutting depth.

Keywords:weak rigid part；thinwalled structure；residual stress