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针对超声振动钻削钛合金过程中刀具温度较高,但刀具磨损较低的问题,对普通钻削和超声振动钻削AISI-Al2024、AISI-1045、Ti6Al4V进行了有限元仿真和试验,分析了刀具温度、磨损、切屑形态等切削过程变量,解释并研究了其加工机理。结果表明:虽然超声振动叠加的能量提高了刀具温度,但在切削区由于超声减摩作用,切削刃承受的切削力和扭矩降低,散热条件改善,因而延长了刀具寿命。另外模拟仿真并试验验证了超声振动钻削的切屑较小,卷曲变形较大。
Aiming at the problem of high tool temperature and low tool wear in ultrasonic vibration drilling of titanium alloy, the finite element simulation and experiment of AISI-Al2024, AISI-1045 and Ti6Al4V in general drilling and ultrasonic vibration drilling are carried out. Tool temperature, wear, chip morphology and other cutting process variables, to explain and study the processing mechanism. The results show that although the energy of the superposition of ultrasonic vibrations increases the tool temperature, the cutting force and torque to be affected by the cutting edge are reduced due to the ultrasonic anti-friction effect, and the cooling conditions are improved, thereby extending the tool life. In addition, the simulation and experiment verified that the chip of ultrasonic vibration drilling is smaller and the curl deformation is larger.