Research and Application of Natural Frequency of Cemented Carbide Micro Drill
The natural frequencies of the micro drill are analyzed by three methods:experiment,simulation and cal-culation.The natural frequencies of unground spiral flute bars and grinded spiral flute products with different diameters and lengths are tested.The frequency differences between bars and products with different specifications are analyzed.Based on the experimental results,the empirical formula for calculating the first order natural frequency of the micro drill bit is sum-marized and compared with the simulated frequency of the bar.The results show that the three methods of experiment,simu-lation and calculation shows good consistency.The natural frequency of micro drill has obvious corresponding relationship with its diameter and length.For micro drill bits with drill diameter of 0.4mm and below and length diameter ratio of more than 20,the empirical formula can be used to quickly determine the natural frequency of the micro drill bit before drilling.The simulation method can accurately obtain the multi-step natural frequency of the micro drill bit,which is convenient for common vibration analysis.The natural frequency of micro drill bit increases with the increase of drilling depth.
cemented carbidemicro drillhigh speed rotationnatural frequencyfinite element
万方数据
维普
