摘要
利用有限元软件建立了钛合金(Ti6Al4V)的切削模型,得到锯齿状切屑的应力场、应变场及温度场,探讨了锯齿状切屑的形成机理,同时模拟了不同切削参数对锯齿状切屑形态的影响。结果表明:切削速度、进给量和刀具前角对锯齿状切屑形态的影响规律相似,即锯齿频率随切削速度、进给量和刀具前角的增加而增大。刀-屑摩擦因数对锯齿状切屑形态无明显影响,但切削力、刀-屑接触长度随刀-屑摩擦因数的增加而增大。换热系数对切削温度影响较大,换热系数越大,对切削温度降温效果越明显。对切削温度的抑制效果由低温冷风雾化射流冷却、水射流冷却、低温冷风冷却依次减弱,但都优于干切削。
Establishes the cutting model of Ti6Al4V alloy by FEM simulation. The distribution of strain rate, strain and temperature in the cutting process is acquired and the formation mechanism of serrated chip is discussed. The infection of different cutting performance to serrated chip sharp is also simulated. The results indicate that the effect rule of cutting speed, feed and tool rake angle on serrated chip sharp is similar. Saw-tooth frequency increases with increase of cutting speed, feed and tool rake angle. Effect of tool-chip friction coefficient on serrated chip shape is not obvious, but cutting force and tool-chip contact length enhance with increase of friction coefficient. The impact of heat transfer coefficient on cutting temperature is great, the heat transfer coefficient is greater, cooling effect is more obvious. Inhibitory effect on cutting temperature, low temperature cold air atomizing jet cooling,water jet cooling and cold air cooling weaken in file,but are better than dry-cutting.
出处
《现代制造工程》
CSCD
北大核心
2016年第8期112-116,133,共6页
Modern Manufacturing Engineering
基金
江苏省自然科学资金资助项目(BK2006082)
江苏省高校自然科学基金资助项目(O4KJB460005)
关键词
锯齿状切屑
有限元
绝热剪切带
serrated chip
FEM simulation
adiabatic shear band
