东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (10): 1487-1490.DOI: 10.3969/j.issn.1005-3026.2015.10.026

• 机械工程 • 上一篇    下一篇

气腿式凿岩机活塞的非线性动力学特性

黄婧， 朱丽莎， 张义民   

  1. (东北大学 机械工程与自动化学院， 辽宁 沈阳110819)
  • 收稿日期:2014-09-17 修回日期:2014-09-17 出版日期:2015-10-15 发布日期:2015-09-29
  • 通讯作者: 黄婧
  • 作者简介:黄婧(1991-)，女，江西樟树人，东北大学博士研究生； 张义民(1958-)，男，吉林长春人，东北大学教授，博士生导师，教育部“长江学者奖励计划”特聘教授.
  • 基金资助:
    国家自然科学基金资助项目(51135003)； 国家重点基础研究发展计划项目 (2014CB046303).

Nonlinear Dynamic Characteristics of Air-Leg Rock Drill Piston

HUANG Jing， ZHU Li-sha， ZHANG Yi-min   

  1. School of Mechanical Engineering & Automation， Northeastern University， Shenyang 110819， China.
  • Received:2014-09-17 Revised:2014-09-17 Online:2015-10-15 Published:2015-09-29
  • Contact: ZHANG Yi-min
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摘要： 以气腿式凿岩机活塞为研究对象，根据实际工况建立了活塞和钎杆冲击系统的有限元模型，利用ANSYS/LS-DYNA软件对活塞冲程过程进行了非线性动力学特性分析，得到了活塞与钎杆各个时刻的应力应变情况.结果表明，活塞冲击能的计算结果与实验结果相比误差较小；活塞的最大应力发生在撞击端面上，此外活塞的花键根部也是受力较大的薄弱环节，最大应力介于其疲劳极限与屈服极限之间；活塞的失效形式为端面接触疲劳和花键根部处疲劳断裂，与实际情况十分吻合.

关键词: 凿岩机, 活塞, 冲击系统, 非线性, 有限元

Abstract: Taking a piston of air-leg rock drill as the research object， a finite element analysis model of the impact system including the piston and drill rod was set up based on the actual conditions. Its nonlinear dynamic characteristics were analyzed using the ANSYS/LS-DYNA software. Therefore， the stresses and strains of the impact system at different time were obtained. The results showed that there are minor deviations between the calculated and experimental results. The maximum stress， which is greater than the fatigue limit and less than the yield limit， appears at the impacting face. The spline root of the piston with strong stress is also a weak link. The failure form of the piston is the contact fatigue of the end face or fatigue fractures of the spline root， which coincides well with the actual situation and provides a scientific basis for reliability design of the piston.

Key words: rock drill, piston, impact system, nonlinear, finite element

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