• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2006, Vol. 42 ›› Issue (7): 109-113.

• 论文 • 上一篇    下一篇

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Al2O3/TiC/CaF2自润滑陶瓷刀具切削过程中的减摩机理

邓建新;曹同坤;艾兴   

  1. 山东大学机械工程学院
  • 发布日期:2006-07-15

FRICTION REDUCING MECHANISMS OF Al2O3/TiC/CaF2 SELF-LUBRICATING CERAMIC TOOLS IN MACHINING PROCESSES

DENG Jianxin;CAO Tongkun;AI Xing   

  1. Mechanical Engineering School, Shandong University
  • Published:2006-07-15

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摘要： 在Al2O3/TiC陶瓷刀具基体内加入固体润滑剂CaF2来改善其摩擦学特性，制备出Al2O3/TiC/CaF2自润滑陶瓷刀具。以该陶瓷刀具对45钢进行干切削试验，结果表明：添加固体润滑剂的Al2O3/TiC/CaF2自润滑刀具的摩擦因数比未添加固体润滑剂的Al2O3/TiC陶瓷刀具显著降低，表现出了良好的减摩效果。在切削过程中，Al2O3/TiC/CaF2自润滑陶瓷刀具中的固体润滑剂由于受到摩擦和挤压作用而析出，能在刀具前刀面上形成润滑膜，可阻止刀—屑间的粘着，显著降低前刀面与切屑间的平均摩擦因数。对自润滑陶瓷刀具切削后磨损表面显微分析表明，前刀面在切削过程中形成了自润滑膜的生成、破损、脱落和再生的循环过程。因此，Al2O3/TiC/CaF2自润滑陶瓷刀具在其整个生命周期内始终具有润滑效果。

关键词: 刀具材料, 摩擦磨损, 切削加工, 自润滑

Abstract: CaF2 solid lubricants are added to Al2O3/TiC ceramic tool matrix to improve its tribological behaviors. Al2O3/TiC/CaF2 self-lubricating ceramic tools are produced successfully. Dry cutting tests are carried out on 45 steel with this kind of ceramic tool. Results show that the friction coefficient between the tool-chip interface of Al2O3/TiC/CaF2 self-lubric- ating ceramic tool is greatly decreased compared with that of common Al2O3/TiC ceramic tool. A self-lubricating film, which can be acted to reduce the friction coefficient and adhesion, is formed between the tool-chip interface during machining processes for Al2O3/TiC/CaF2 self-lubricating ceramic tool. Microstructure analysis of the wear surface show the self-lubri- cating film on the tool rake face experiences a four stage cycle, ie. Forming, fracture, falling off and re-forming, Therefore, this kind of ceramic tool has self-lubricating behaviours during its full lifetime.

Key words: Machining, Self-lubrication Friction and wear, Tool material

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