RECOGNITION OF WOOD CUTTING CONDITIONS TH ROUGH CUTTING SOUNDS III - CORRESPONDENCE BETWEEN BREAKING SOUNDS IN WOOD BREAKING TESTS AND CUTTING SOUNDS IN SEVERAL TYPES OF CHIP FORMATIONS
K. Nagatomi et al., RECOGNITION OF WOOD CUTTING CONDITIONS TH ROUGH CUTTING SOUNDS III - CORRESPONDENCE BETWEEN BREAKING SOUNDS IN WOOD BREAKING TESTS AND CUTTING SOUNDS IN SEVERAL TYPES OF CHIP FORMATIONS, Mokuzai Gakkaishi, 44(1), 1998, pp. 25-32
The purpose of this study was to clarify the effects of wood breaking
sounds on the cutting sounds in the ultrasound frequency range (20 k-1
00 kHz). The wood breaking tests simplifying the process of chip forma
tions were made to examine the frequency characteristics of breaking s
ounds in splitting, bending, and shearing. The orthogonal cutting test
s also were made to examine the frequency characteristic of cutting so
unds in the five types of chip formations (flow, split, compressive, s
hear, and tear). The correspondence between the above-mentioned two fr
equency characteristics in the ultrasound frequency range was investig
ated. The results were as follows: 1) The frequency characteristics of
the breaking sounds in both bending and splitting showed a constant s
ound pressure level in the frequency range of 40 kHz to 100 kHz. Howev
er, the sound pressure level of the breaking sound in bending was high
er than that oi the breaking sound in splitting. 2) The frequency char
acteristic of the breaking sound in shearing showed a decreasing of so
und pressure level with increasing frequency, and this breaking sound
included few components of frequencies above 80 kHz. 3) In the ultraso
und frequency range, the frequency characteristics of the cutting soun
ds correspond well with the breaking sounds of the main breaking types
for each of the chip types. Consequently, it was clear that the wood
breaking sound affects considerably the cutting sound of the ultrasoun
d frequency range generated during chip formation.