摘要
刀具各设计参数的选取直接影响刀具的可靠度和被加工件的精度。以应力-强度干涉(SSI)模型为基础,建立硬质合金刀具的动态可靠性数学模型,给出了刀具在切削加工时的可靠度变化规律。在此基础上与灵敏度分析方法相结合,推导出硬质合金刀具物理参数和材料参数的动态可靠性灵敏度计算公式,并给出了各参数的动态可靠性灵敏度的变化曲线。研究结果表明,随着切削加工时间和冲击载荷作用次数的增加,刀具各参数的敏感程度也逐步增大,对敏感参数可以通过直接或间接的手段加以控制,以降低对刀具可靠度的影响,进而提高刀具的可靠度和被加工零件的精度。该方法为提高刀具系统及整个机床的可靠性提供理论参考依据。
The selection of design parameters of cutting tool has the direct effect on the reliability of tools and the precision of processed workpiece. Based on stress-strength interference model, a mathematical model on dynamic reliability of hard alloy cutting tool is built, and the change rule of its reliability is ob- tained. Combining with sensitivity analysis method, the computational formulas of dynamic reliability sen- sitivity of physical and material parameters of hard alloy cutting tool are deduced, and the curves of relia- bility sensitivity of design parameters are also given. The results show that the design parameters of cut- ting tool are more sensitive with the increase in machining time and impact loading action, thus the selec- tion of sensitive parameters should be controlled directly or indirectly so as to reduce its influence on reli- ability of cutting tool, which can improve the reliability of cutting tool and the precision of processed workpiece. Meanwhile, the proposed method provides a theoretical basis for enhancing the reliability of tool system and the whole machine tool
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2014年第1期114-119,共6页
Acta Armamentarii
基金
国家自然科学基金项目(51105068
51305071)
高等学校博士学科点专项科研基金项目(20110042120017)
中国博士后基金项目(20110491505)
中央高校基本科研业务项目(N120203001)
关键词
刀具技术
机械强度
刀具
动态可靠性
灵敏度
临界疲劳应力
cutting tool technology
mechanical strength
cutting tool
dynamic reliability
sensitivity
critical fatigue stress
