手押かんな盤の振動と騒音(第2報) : 刃先まもうと騒音

The purpose of this paper is to present an analysis of the noises caused by the planers according to the degree of the knife edge wear.
Planing noises caused by several factors shown in Table 1 were measured to investigate sound pressure levels and frequency characteristics by using a hand-feed planer. Also, the sharpness of the knife edge was measured.
Noises were measured by a sound level meter, a 1/3 octave band pass filter, data and high speed level recorders.
The conclusions from the experiment may be summarized as follows :
(1) The duller the knife edge, the louder is the planing noise.
(2) The type of noises in actual planing is different from that in no-load running, the sound pressure level at higher frequencies increases in actual planing : when the knife is sharp, the sound pressure level over 1K Hz is greater than in no-load running, while the knife is dull, the sound pressure level over 400 Hz is predominat.