东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (4): 546-550.DOI: 10.12068/j.issn.1005-3026.2020.04.016

• 机械工程 • 上一篇    下一篇

预应力时效性对磨削强化表面应力的影响

牛艺静， 孙聪， 庞刚， 修世超   

  1. (东北大学 机械工程与自动化学院， 辽宁 沈阳110819)
  • 收稿日期:2019-06-25 修回日期:2019-06-25 出版日期:2020-04-15 发布日期:2020-04-17
  • 通讯作者: 牛艺静
  • 作者简介:牛艺静(1983-)，女，辽宁鞍山人，东北大学博士研究生; 修世超(1958-)，男，内蒙古赤峰人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51775101)； 中央高校基本科研业务费专项资金资助项目(N180306003).

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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摘要： 为了获得不同预应力卸载时间的磨削硬化层残余应力值及马氏体含量，进行了预应力淬硬磨削实验.对预应力磨削进行仿真，得到了工件表层的温度变化情况及预应力卸载时间对表面机械热应力的影响.结合实验数据和仿真模拟，讨论了预应力时效性对相变和相变应力的影响.结果表明:在7s内，预应力具有一定的时效性；随着卸载时间的增加，晶体内部晶界伸长，马氏体含量有所增加，加工表面残余压应力增加.

关键词: 预应力磨削, 卸载时间, 相变, 残余应力, 有限元仿真

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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