Tap 표준절삭 조건표

Lead screw type

주의 : Multi Spindle Head의 master screw type은 적용 하지 말 것.

$V$ = Cutting speed (m/min), $F$ = Feed (mm/min) = $n \times p$, $n$ = R.P.M, $p$ = PITCH

가공물 재질	가공경	STRAIGHT FLUTED TAP				SPIRAL TAP
		HSS		WC		HSS	WC
		V	F	V	F	V	F
FC20 FC25 FC25DC FCD-J	M6, M8, M10 NPTF1/16, PT1/8	6~10	$n \times p$	10~15	$n \times p$	7~12	$n \times p$
	M12, M14, M16 PT1/4, PT3/8	6~10	$n \times p$	15~20	$n \times p$	7~12	$n \times p$
	M20, M24	6~10	$n \times p$	15~20	$n \times p$	7~12	$n \times p$
FCV35 FCD50 FCD50A FCD70 FCD70C FCMP55S	M6, M8, M10 NPTF1/16, PT1/8	6~8	$n \times p$	8~12	$n \times p$	7~10	$n \times p$
	M12, M14, M16 PT1/4, PT3/8	6~8	$n \times p$	12~16	$n \times p$	7~10	$n \times p$
	M20, M24	6~8	$n \times p$	15~20	$n \times p$	7~10	$n \times p$
AC2B-A AC3A AC4B A4B-F ADC10	M6, M8, M10 NPTF1/16, PT1/8	10~15	$n \times p$	10~15	$n \times p$	10~15	$n \times p$
	M12, M14, M16 PT1/4, PT3/8	10~15	$n \times p$	15~20	$n \times p$	10~15	$n \times p$
	M20, M24	10~15	$n \times p$	15~20	$n \times p$	10~15	$n \times p$
S43C S44C S48C S48CM S53C S53CM	M6, M8, M10 NPTF1/16, PT1/8	6~8	$n \times p$	10~15	$n \times p$	7~15	$n \times p$
	M12, M14, M16 PT1/4, PT3/8	6~8	$n \times p$	15~20	$n \times p$	7~15	$n \times p$
	M20, M24	6~8	$n \times p$	15~20	$n \times p$	7~15	$n \times p$
SCM420H SCM318 SCM415 SCM440H ASM443H ASCM17H1	M6, M8, M10 NPTF1/16, PT1/8	6~10	$n \times p$	10~15	$n \times p$	7~15	$n \times p$
	M12, M14, M16 PT1/4, PT3/8	6~10	$n \times p$	15~20	$n \times p$	7~15	$n \times p$
	M20, M24	6~10	$n \times p$	15~20	$n \times p$	7~15	$n \times p$

MASTER SCREW TYPE (전용공작기계)

적용범위 : Multi Spindle Head의 Master screw type.

$V$ = Cutting speed (m/min), $F$ = Feed (mm/min) = $n \times p$, $n$ = R.P.M, $p$ = PITCH

TAP SIZE	V
M6	3.7~4.8
M8	5.0~6.3
M10	6.3~7.8
M12	7.5~9.4
M14	8.5~11.0
M16	10.0~12.0
M20	10.0~13.0
M24	10.0~13.0

TAP SIZE	V
NPTF 1/16	4.5~5.6
PT 1/8	6.0~7.6
PT 1/4	8.0~10.0
PT 3/8	10.0~13.0

절삭동력 계산

Work material : FC25DC (HB201-232)
Screw type : Master screw
Type of tap : Spiral tap
Material of tap : HSS

Tool specification : M16x2.0 ($D=16$, $PITCH=2.0$)
Count (EA) : 1 EA
$V$ (m/min) : Cutting speed (= 12)
$H$ (mm) : Effective depth (= 20.0)

R.P.M (rev/min)

$$RPM = \frac{V \times 1000}{\pi \times D} = \frac{12 \times 1000}{\pi \times 16} = 238.732\text{ rpm}$$

Feed rate $F_1$ (mm/min)

$$F_1 = PITCH \times RPM = 2.0 \times 238.732 = 477.465$$

Cutting Time $T$ (sec)

$$T = 2.0 \times \frac{(L_1 + H + 3.0) \times 60}{F_1} = 2.0 \times \frac{(0 + 20.0 + 3.0) \times 60}{477.465} = 5.781\text{ sec}$$

Chip량 (Rate of metal removal) $Q$ ($\text{cm}^3\text{/min}$)

$$\begin{aligned} Q &= A \times L_{av} \times RPM \times 10^{-3} \\ &= 0.5725 \times 47.166 \times 238.732 \times 10^{-3} \\ &= 6.501\text{ cm}^3\text{/min} \end{aligned}$$

나사의 단면적 ($A$)

$$A = \frac{(D-D_1)^2}{4.0} \times \tan(30^\circ) = \frac{(16-14)^2}{4.0} \times \tan(30^\circ) = 0.5725$$

평균지름 ($D_{av}$)

$$D_{av} = \frac{D+D_1}{2.0} = \frac{16 + 14}{2.0} = 15.0$$

나사길이 / PITCH ($L_{av}$)

$$L_{av} = \sqrt{(D_{av} \times \pi)^2 + Pitch^2} = \sqrt{(15.0 \times \pi)^2 + 2.0^2} = 47.166$$

TAP형태 보정계수 ($k$)

$k=1.50$ : STRAIGHT FLUTED TAP, 세목나사

절삭 토크 $T_{max}$ ($\text{N}\cdot\text{m}$)

$$\begin{aligned} T_{max} &= \frac{\tan \theta}{24000} \times (D - D_1)^2 \times (D + 2D_1) \times K_t \times k \times 9.81 \\ &= \frac{\tan(30^\circ)}{24000} \times (16 - 14)^2 \times (16 + 2 \times 14) \times 319 \times 1.5 \times 9.81 \\ &= 19.873 \end{aligned}$$

순수 절삭동력 $N_o$ (Kw)

$$N_o = \frac{T_{max} \times RPM}{9550} = \frac{19.873 \times 238.732}{9550} = 0.497\text{ kW}$$

Motor의 선정 = 1.5 kW

계산된 순수절삭동력 $N_o = 0.497\text{ kW}$를 기준으로 한 단계 높은 사양을 채택합니다.

No (kW)	초과	-	0.8	1.3	2.6	4.1	5.9	9.2	13.1	16.5	19.1
No (kW)	이하	0.8	1.3	2.6	4.1	5.9	9.2	13.1	16.5	19.1	26.0
효율(η)		1.88	1.7	1.4	1.34	1.27	1.2	1.15	1.15	1.15	1.15
사용 Motor		1.5	2.2	3.7	5.5	7.5	11.0	15.0	19.0	22.0	30.0

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