摘要
阐述了如何将高速铣削和锯切的切削状态转化成高速冲击的形态方法,由此给出了"变形嵌入式"冲击模型;通过对45钢和A3钢的超高速切削实验获得了不同超高速切削速度下的金相组织照片;推导了45钢切屑的本构方程;测定了速度与切削力的关系曲线;用冲击波的理论研究碳钢在超高速切削状态下的切削机制。由此得出的结论是:当冲击频率大于27kHz时易发生"完全再结晶"现象,碳钢在高速切削状态下不会出现绝热剪切现象。
How to change the high-speed milling and sawing cutting states into the high-speed shocking states is illustrated,and the＂deforming embedded＂shocking mode is derived.By the experiment of cutting carbon 45 and A3 steel at a ultra-high-speed,different ultra-high-speed cutting photos of microstructures are obtained.The constitutive equation of the 45 steel are derived,and the related curves of the speed versus cutting power are determined.The cutting mechanism of the carbon steel under ultra-high-speed condition is investigated.A new way for highspeed and ultra high-speed cutting is explored.Results show that when the shock frequency is higher than 27 kHz,it is easier for the＂completely recrystallization＂phenomenon to occur,and the carbon steel will not exhibit the adiabatic shear phenomenon in the high-speed cutting state.
出处
《机械科学与技术》
CSCD
北大核心
2010年第6期783-787,共5页
Mechanical Science and Technology for Aerospace Engineering
基金
国家863项目(2003AA424040)资助
关键词
冲击波
碳钢
超高速
作用机制
shock wave
carbon steel
ultra-high-speed
mechanism
