Journal of Northeastern University:Natural Science ›› 2017, Vol. 38 ›› Issue (5): 684-689.DOI: 10.12068/j.issn.1005-3026.2017.05.016

• Mechanical Engineering • Previous Articles     Next Articles

Chatter Reliability Prediction in the Turning Process with Time-Varying Stability

LIU Yu1, WANG Zhen-yu1, YANG Hui-gang2, ZHANG Yi-min1   

  1. 1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China; 2. Jiangzhen Electrical Engineering Institute, Heze University, Heze 274015, China.
  • Received:2015-05-14 Revised:2015-05-14 Online:2017-05-15 Published:2017-05-11
  • Contact: LIU Yu
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Abstract:

Tool wear in the machining process changes the cutting force coefficient and other parameters in flux, which causes the prediction accuracy of traditional chatter prediction to decrease greatly with the increase of processing time. The time-varying reliability theory was introduced to predict chatter reliability, and the linear equations were used to express the change inthe mean values of cutting force coefficient with varied cutting time whereby the chatter stability and reliability model in turning was presented. The time-varying critical cutting width and time-varying chatter reliability curve were obtained in the given machining conditions, and the corresponding calculation method was tested experimentally. The results showed that the proposed method can be used to predict the chatter of different processing time accurately.

Key words: tool wear, cutting force coefficient, time-varying random parameter, time-varying chatter reliability, time-varying chatter stability

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