Boring 절삭동력 계산
- Work material : FCD70C (HB229-285)
- Material of tip : Insert tip
- $D$ (mm) : Cutting diameter (= 120)
- $d$ (mm) : Clearance (절삭 깊이) (= 3.0)
- $L$ (mm) : Cutting length (= 200)
- $K_r$ (deg) : Entering angle (= 75)
- $V$ (m/min) : Cutting speed (= 80)
- $f$ (mm/rev) : Feed rate (= 0.2)
- $K_s$ ($\text{kg/mm}^3$) : Turning material factor
(= 280)
R.P.M (rev/min)
$$RPM = \frac{V \times 1000}{\pi \times D} = \frac{80 \times 1000}{\pi \times 120} = 212.207$$Feed rate $F_1$ (mm/min)
$$F_1 = f \times RPM = 0.2 \times 212.207 = 42.441$$Cutting Time $T$ (sec)
$$T = \frac{(L + 3.0) \times 60}{F_1} = \frac{(200 + 3.0) \times 60}{42.441} = 286.984$$Chip양 (Rate of metal removal) $Q$ ($\text{cm}^3\text{/min}$)
$$Q = d \times f \times V = 3.0 \times 0.2 \times 80 = 48$$ENTERING ANGLE에 따른 계수 ($K_r$)
재질에 따른 절삭계수는 TURNING의 $K_s$값을 적용하며,
$K_r$ 값은 아래 표를 참조합니다. (조건: $K_r = 0.96$, $K_s = 280$)
| Entering Angle | 45° | 60° | 72° | 75° | 90° | 93° | 95° |
|---|---|---|---|---|---|---|---|
| $K_r$ | 0.70 | 0.86 | 0.94 | 0.96 | 1.0 | 1.0 | 1.0 |