An approach to predict the distortion of thin-walled parts affected by residual stress during the milling process
An approach to predict the distortion of thin-walled parts affected by residual stress during the milling process
复制标题
一种预测铣削过程中受残余应力影响的薄壁零件变形的方法
DOI：
10.1007/s00170-017-0811-2
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发表时间：
2017-12-01
影响因子：
3.4
通讯作者：
Li, Haolin
中科院分区：
文献类型：
--
作者：
Jiang, Xiaohui;Wang, Yifei;Li, Haolin
在影响薄壁零件变形的所有主要因素中，残余应力在加工前后起着关键作用。因此，有必要对加工完成后的加工精度进行控制，并提出一种预测精度的方法。本文通过综合多因素优化分析与研究，以航空航天机架薄壁零件为研究对象，提出了残馀应力对薄壁零件加工精度影响的预测方法。采用该方法，以残馀应力为优化目标，在特征单一的情况下，由内而外排列最优加工路径。相反，对于不同特点的加工，应从外到内反向分配最佳加工顺序。利用预测方法对目标薄壁零件进行了验证，结果表明，较小的表面初始应力值和加工后的残余应力大小可以减小薄壁零件的变形。这样既能提高薄壁零件的加工精度和稳定性，又能上一个台阶。
Among all the main influential factors on the distortion of thin-walled parts, residual stress plays a key role before or after the machining process. It is worth to control and propose an approach to predict the precision of workpiece after the processing has been completed. In this study, through comprehensive multi-factor optimization analysis and investigation, a thin-walled workpiece with aerospace frame is taken as the research object, followed by the proposition of a method of predicting the processing accuracy of the thin-walled part during the milling affected by the residual stress. Using the proposed approach and considering of the residual stress as the optimization goal, the optimized milling path should be arranged from the inside to the outside in the case of a single characteristic. By contrast, for the machining with different characteristics, the best processing sequence should be assigned reversely, from the outside to the inside. After using the prediction method and verification with a target thin-walled part, this study concludes that the smaller magnitude of surface initial and machined residual stress will reduce distortion of the thin-walled part. In this way, the processing accuracy and stability of thin-walled parts can be both improved and raised to a higher level.