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孔挤压强化技术研究进展和展望

王燕礼1,2,朱有利3,曹强4,张小辉4   

  1. 1. 国营芜湖机械厂
    2. 装甲兵工程学院装备维修与再制造工程系
    3.
    4. 芜湖国营机械厂
  • 收稿日期:2017-04-19 修回日期:2017-08-01 发布日期:2017-08-02
  • 通讯作者: 王燕礼

Research Progress and Prospect on Hole Cold Expansion Technique

  • Received:2017-04-19 Revised:2017-08-01 Published:2017-08-02

摘要: 螺接和铆接是飞机结构主要连接方法,因为孔边存在严重结构应力集中,孔结构很容易发生疲劳断裂,影响航空安全性和可靠性,因此,提高连接孔疲劳强度是航空业普遍关心的关键技术问题之一。孔挤压是当前国际上应用最为广泛的连接孔抗疲劳制造技术,具有不改变结构设计、材料,不增加飞机重量,成本低、效果好等优势。文章从孔挤压技术发展、孔挤压强化机理、孔挤压影响因素、服役条件对孔挤压疲劳增益影响、以及再挤压对预疲劳连接孔疲劳增益影响等五个方面进行了较为系统地总结,并基于孔挤压技术研究现状和航空工业发展实际需求,分析了当前研究的不足,提出了一些未来研究孔挤压技术需要关注的建议。

关键词: 孔挤压, 研究进展, 展望, 残余应力, 疲劳增益

Abstract: Bolt joint and riveting joint are the main connection methods of the aircraft structure. Because of the serious structural stress concentration at hole edge, hole structures are prone to fatigue fracture. Therefore, improving the fatigue strength of connection hole is a critical technical problem that the aviation industry is generally concerned about. Hole cold expansion is the most widely used technique for the hole anti-fatigue manufacturing. In present paper, the hole cold expansion technologies, the strengthening mechanism, the factors influencing cold expansion process, the effect of service conditions on cold expansion anti-fatigue gain, and the effect of re-cold expansion on pre-fatigued hole are summarized, at last, based on the studying status of cold expansion and the actual needing in aviation industry, some prospects and recommendations of cold expansion needed to be further studied in the future are proposed.

Key words: Hole Cold Expansion, Research Progress, Prospect, Residual Stress, Fatigue Gain

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