车用TiC4板超声振动辅助钻削动力学及钻孔过程试验

Experimental on drilling dynamics and drilling process of TIC4 plate assisted by ultrasonic vibration

为了提高汽车轻量化所用钛合金的钻削质量,以TiC4合金板为例,开展超声振动辅助钻削动力学及钻孔过程试验研究。构建了动力学模型并完成各项参数的估计,完成模型的超声振动测试。动力学试验结果表明:当系统到达钻削阶段时,形成了相应的倍频。钻头除了存在沿自身匀速旋转运动以外,还沿进给方向形成了明显的简谐激振力,从而产生了而具有周期性的切削厚度。按照设定进给速度与主轴转速参数,对钛合金工件实施钻孔测试。钻孔试验结果表明:设置轴向振动之后,轴向力明显的下降,且变化更为平稳。超声振动方式能够增强钻头切削能力,促进断屑并快速排出,由此获得稳定的钻削效果。该研究对提高钛合金板的钻削质量具有很好的实际应用价值,易于推广实现。

In order to improve the drilling quality of titanium alloy,an experimental study on ultrasonic vibration assisted drilling dynamics and drilling process of TiC4 alloy plate was conducted.The appropriate dynamic model was built and the parameter estimation was completed,and then the ultrasonic vibration test of the model was completed.The results of the dynamic test showed that the corresponding frequency doubling was formed when the system reached the drilling stage.In addition to the uniform rotating motion process along its own method,the drill bit also forms obvious harmonic excitation force along the feed direction,thus producing the periodic cutting thickness.According to the set parameters of feed speed and spindle speed,the drilling test was carried out on the titanium alloy workpiece.The drilling test results show that the axial force decreases obviously after the axial vibration is set,and the change is more stable.The ultrasonic vibration mode can enhance the cutting ability of the bit,promote chip breaking and rapid removal,thus achieving stable drilling results.The research has a good practical value for improving the drilling quality of titanium alloy plate and is easy to be popularized and realized.