• CN:11-2187/TH
  • ISSN:0577-6686

›› 1989, Vol. 25 ›› Issue (3): 1-7.

• 论文 •    下一篇

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陶瓷刀具断续车削钢时破损判据的研究

艾兴;夏传波   

  1. 山东工业大学
  • 发布日期:1989-06-01

STUDY ON THE CRITERION FOR CERAMIC TOOL FRACTURE IN INTERMITTENT TURNING STEEL

Ai Xing;Xia Chuanbo   

  1. Shandong University of Technology
  • Published:1989-06-01

摘要: 本文分析研究了陶瓷刀具断续车削时破损的特点,提出了一个新的断裂力学——随机特性陶瓷刀具破损判据。通过陶瓷刀具力学性能测定和破损寿命随机特性切削试验,以及刀具应力有限元计算表明,根据本文所提破损判据计算得的陶瓷刀具理论破损寿命及其分布规律,经过一定修正后,与试验结果基本一致。刀具破损面的SEM分析也说明,陶瓷刀具的后期破损具有疲劳破坏的特性。

关键词: 断裂力学, 破损机理, 破损判据, 破损寿命, 陶瓷刀具

Abstract: A new criterion of fracture mechanics-stochastic characteristics for ceramic tool fracture based on the analysis of its fracture features in intermittent turning is proposed in the paper. The distribution function of theoretical tool life by fracture from the new criterion for fracture is derived. A series of experiments on strength and fracture performance for ceramic tool as well as cutting tests on tool life by fracture have been done. SEM analysis on the tool fracture faces shows that late fracture of ceramic tool appears in fatigue character. The stresses in tool tip are analysed by finite elements method. The modified distribution function of theoretical tool life by fracture presents a good agreement with experimental results. The AE technique is used for detecting tool fracture.

Key words: 断裂力学, 破损机理, 破损判据, 破损寿命, 陶瓷刀具