RECOGNITION OF WOOD CUTTING CONDITIONS TH ROUGH CUTTING SOUNDS .2. RELATIONSHIPS BETWEEN CHIP FORMATIONS AND CHARACTERISTICS OF CUTTING SOUNDS IN 90-0-CUTTINGS, 0-90-CUTTINGS, AND 90-90-CUTTINGS
K. Nagatomi et al., RECOGNITION OF WOOD CUTTING CONDITIONS TH ROUGH CUTTING SOUNDS .2. RELATIONSHIPS BETWEEN CHIP FORMATIONS AND CHARACTERISTICS OF CUTTING SOUNDS IN 90-0-CUTTINGS, 0-90-CUTTINGS, AND 90-90-CUTTINGS, Mokuzai Gakkaishi, 40(11), 1994, pp. 1185-1193
To clarify the relationships between cutting sounds and types of chip
formations during orthognal cutting of hinoki (Chamaecyparis obtusa En
dl.) in 90-0, 0-90, and 90-90 cutting directions, cutting sounds and c
utting-system vibrations were measured. Cutting tests were performed o
n four depths of cuts (0.05-0.3 mm) and six cutting angles (30-80 degr
ees), keeping cutting speed constant at 1 m/s with a whirling disc-mac
hine. The following results were obtained: 1) Cutting sounds in the lo
w-frequency range (0-6 kHz) are affected much by the cutting-system vi
brations generated by variations of cutting resistance. Also, in this
frequency range, frequency characteristics of cutting sounds almost ag
ree with the frequency characteristic of the cutting-system vibration
except to generate a split type of chip formation in the 90-0 cutting.
2) It is considered that cutting sounds in the ultrasound range (20 k
-100 kHz) have effects of other things than effects of the cutting-sys
tem vibration as a sound source, because increasing tendencies of soun
d pressure levels are different from cutting sounds in the low-frequen
cy range. 3) Power spectra of cutting sounds in 90-0 cutting indicated
particular patterns for different types of chip formations. It is the
refore possible to recognize types of chip formations by use of spectr
a patterns of cutting sounds. 4) It seems that the use of power spectr
a of cutting sounds in 0-90 and 90-90 cuttings are difficult to recogn
ize types of chip formations.