Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (4): 546-550.DOI: 10.12068/j.issn.1005-3026.2020.04.016

• Mechanical Engineering • Previous Articles     Next Articles

Effect of Pre-stress Time-Characteristics on Grinding Strengthened Surface Stress

NIU Yi-jing, SUN Cong, PANG Gang, XIU Shi-chao   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Received:2019-06-25 Revised:2019-06-25 Online:2020-04-15 Published:2020-04-17
  • Contact: NIU Yi-jing
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Abstract: In order to obtain the residual stress value and martensite content of the hardened layer with different pre-stress unloading times, a pre-stress hardening grinding experiment was carried out. The pre-stress grinding was simulated to obtain the temperature change of the surface layer of the workpiece and the influence of the pre-stress unloading time on the surface’s mechanical thermal stress. Combining the experimental data and simulation, the effects of pre-stress time-characteristics on phase transformation and phase transformation stress were discussed. The results showed that the pre-stress has certain time-characteristics in 7 seconds. With the increase of unloading time, the grain boundary of the crystal is elongated, the content of martensite increases, and the residual compressive stress of the machined surface increases.

Key words: pre-stress grinding, unloading time, phase transformation, residual stress, FEM simulation

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