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= 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*p	10~15	n*p	7~12	n*p
	M12.M14,M16 PT1/4,PT3/8	6~10	n*p	15~20	n*p	7~12	n*p
	M20,M24	6~10	n*p	15~20	n*p	7~12	n*p
FCV35 FCD50 FCD50A FCD70 FCD70C FCMP55S	M6,M8,M10 NPTF1/16,PT1/8	6~8	n*p	8~12	n*p	7~10	n*p
	M12.M14,M16 PT1/4,PT3/8	6~8	n*p	12~16	n*p	7~10	n*p
	M20,M24	6~8	n*p	15~20	n*p	7~10	n*p
AC2B-A AC3A AC4B A4B-F ADC10	M6,M8,M10 NPTF1/16,PT1/8	10~15	n*p	10~15	n*p	10~15	n*p
	M12.M14,M16 PT1/4,PT3/8	10~15	n*p	15~20	n*p	10~15	n*p
	M20,M24	10~15	n*p	15~20	n*p	10~15	n*p
S43C S44C S48C S48CM S53C S53CM	M6,M8,M10 NPTF1/16, PT1/8	6~8	n*p	10~15	n*p	7~15	n*p
	M12.M14,M16 PT1/4,PT3/8	6~8	n*p	15~20	n*p	7~15	n*p
	M20,M24	6~8	n*p	15~20	n*p	7~15	n*p
SCM420H SCM318 SCM415 SCM440H ASM443H ASCM17H1	M6,M8,M10 NPTF1/16,PT1/8	6~10	n*p	10~15	n*p	7~15	n*p
	M12.M14,M16 PT1/4,PT3/8	6~10	n*p	15~20	n*p	7~15	n*p
	M20,M24	6~10	n*p	15~20	n*p	7~15	n*p

MASTER SCREW TYPE (전용공작기계)

적용범위 : Multi Spindle Head의 Master screw type.

V= Cutting speed (m/min), F= Feed (mm/min)= n x 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
Count N(EA) : 1 EA

R.P.M(rev/min)

$$$ R.P.M = \frac{V \cdot 1000}{\pi \cdot D} = \frac{12 \cdot 1000}{\pi \cdot 16} = 238.732 rpm $$$

Feed rate

$$$ F_{1} (mm / min) = PITCH \cdot RPM = 2.0 \cdot 238.732 = 477.465 $$$

Cutting Time

$$$ T(sec) = 2.0 \cdot \frac{(L1 + H +3.0) \cdot 60}{F_{1}} = 2.0 \cdot \frac{(0 + 20.0 +3.0) \cdot 60}{477.465}= 5.781 sec $$$

Chip량 (Rate of matal removal)

\begin{align} Q &= A \cdot Lav \cdot RPM \cdot10^{-3} (cm^3 /min)\\ &= 0.5735 \cdot 47.166 \cdot 238.732 \cdot10^{-3} (cm^3 /min)\\ &= 6.501 (cm^3 /min) \end{align}

나사의 단면적
$$ A = \frac{(D-D1)^2}{4.0}\cdot \tan30 = \frac{(16-14)^2}{4.0}\cdot \tan30 = 0.5725 $$

평균지름
$$ Dav =\frac{D+D1}{2.0}==\frac{16 + 14}{2.0} =15.0 $$

나사길이 / PITCH
$$ Lav = \sqrt{(Dav \cdot \pi)^2 + Pitch^2} = \sqrt{(15.0 \cdot \pi)^2 + 2.0^2} = 47.166 $$

TAP형태 보정계수

k=1.50: STRIGHT FLUTED TAP , 세목나사

절삭 토로크(N*m)

\begin{align} T_{max} &= \frac{\tan \theta}{24000}\cdot (D - D1)^2 \cdot (D + 2D1) \cdot Kt \cdot k \cdot 9.81 \\ &= \frac{\tan \theta}{24000}\cdot (16 - 14)^2 \cdot (16 + 2\cdot14) \cdot 319 \cdot 1.5 \cdot 9.81 \\ &= 19.873 \end{align}

순수 절삭동력

$$$ N_{o}(Kw) = \frac{T_{max} \cdot RPM}{9550} = \frac{238.732 \cdot 19.873}{9550} = 0.497 $$$

Motor의 선정

No=0.497 Kw , Motor=1.5 Kw

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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