吉林大学学报(工学版) ›› 2012, Vol. 42 ›› Issue (01): 109-115.

• paper • Previous Articles     Next Articles

Influence of linearly varying cutting depth on nanocutting of monocrystalline copper

ZHOU Xiao-qin1, ZHU Zhi-wei1, LUO Dan1, ZHAO Shao-xin1, ZHAO Xiao-dong1,2   

  1. 1. College of Mechanical Science and Engineering, Jilin University, Changchun 130022, China;
    2. Foundational Department, Aviation University of Air Force, Changchun 130022, China
  • Received:2010-12-10 Online:2012-01-01 Published:2012-01-01

Abstract:

A model was built for the dependence of the principal tendency component of the cutting force on the cutting depth in the nanocutting process of the monocrystalline copper to explain the non-linear size effect. The complexity of the high-frequency disturbance of the cutting force during different cutting phases was examined by the approximate entropy measure. The obtained results show that the cutting force changes abruptly from the negative value to a large positive value in the cutting-in phase, appear the phenomena of the elasticity instability and the incipient elasticity-plasticity transition. During the cutting phase, the principal tendency component of the cutting force varies in low-frequency with distinct peaks and valleys, and there presents the non-linear size effect depending on the cutting depth. Observing the dislocation nucleation and the dislocation motion inside the workpiece material, the radical cause of the evolution characteristic of the cutting force during the linearly varying cutting depth was explained.

Key words: machine tool, nanocutting, molecular dynamics, cutting force, dislocation motion, fractional calculus, approximate entropy

CLC Number: 

  • TG501.1


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