Monitaring of Wear Condition of Wood Machine Boring Bit by Cutting Sound

近年来，家具厂对刀具磨损或机床镗削的过程检测提出了新的要求。在这项工作中，切割声音作为上述过程中检测方法被注意到，在木材和木质材料的机器镗孔过程中测量切割声音。如果我们想通过切削声来监测机床镗孔钻头的刀具磨损情况，那么在表示刀具磨损量与切削声之间关系的回归线中，相关系数的绝对值和回归系数的值都应该很大。从硬质合金钻头对刨花板、中密度纤维板、杉木、栗木、lauan、道格拉斯杉木的机镗实验结果来看，切削声功率谱中10K Hz-12KHz或10KHz-20KHz的声压级随着机镗钻头刀具磨损量的增加呈显著的直线下降，几乎对每种工作材料都具有较高的相关系数。因此，测量特定频率范围内切削声的声压级对于机床钻头在加工过程中刀具磨损的检测是有希望的。

The establishment of in-process detection of tool-wear or chipping of machine boring bits are requested in the furniture factory recently. In this work, cutting sound was noticed as the above-mentioned in-process detection method, cutting sounds were measured in the machine boring of wood and wood-based materials.If we want to monitor the tool wear condition of machine boring bit by cutting sound, it is desirable that both the absolute value of correlation coefficient and the value of regression coefficient in the regression line showing the relationship between the amount of tool wear and cutting sound should be large.From the experiment results in the machine boring of particleboard, MDF, hinoki, kuri, lauan, Douglas-fir with cemented carbide bit, the sound pressure levels of 10K Hz-12KHz or 10KHz-20KHz in the power spectrum of cutting sound decreased remarkably rectilinearly with the increase of the amount of tool wear of machine boring bit having high correlation coefficient for almost each work material.Thus, it was concluded that measuring of sound pressure level of cutting sound of specific frequency range are promising for the in-process detection of tool wear of machine boring bits.