Page 36 - HOLE MAKING CATALOG p149-184

SOLID CARBIDE DRILLS USER GUIDE

General - Calculations

Spindle Speed (min-1) Example

n= vcπ∙1∙ 0D00 Drill DR 220-044-25-07-2D-N (Ø22 mm) - Material No. 4

Cutting Speed (m/min) kc=2200 N/mm2 k=90º, sin k=1 η=0.75 h=10 mm
vc=200 m/min CMh=50 $/h L=25 mm
km=1 kf=1 f=0.15 mm/rev

vc = π∙D∙ n n = vc ∙ 1000 ∙ 200 ∙ 1000 = 2894 min-1
1000 π∙D π ∙ 22

Table Feed (mm/min) vf = f ∙ n=0.15 ∙ 2894 = 434 mm/min

vf = f ∙ n Q = vf ∙π ∙ D2 434 ∙ 3.14 ∙ (22)2
4000 4000
=

Material Removal Rate (cm3/min) = 165 cm3/min

Q= vf ∙ π ∙ D2 Pc = Q η ∙ Kc ∙ sin k
4000 60.000 ∙

Power Requirement (kW) = 65 ∙ 2200 ∙ 1 =8.06 kW
60.000 ∙ 0.75

Pc = Q ∙ η ∙ kc ∙ sin k Mc = f ∙ Kc ∙ D2 ∙ sin k
60.000 10000 8

Torque (Nm) = 0.15 ∙ 2200 ∙ 222 ∙ 1 ∙1 = 20 Nm
10000 8

Mc = f1∙00k0c ∙ D2 ∙ sin k∙km Ff = 0.63 ∙ D ∙f ∙ Kc ∙ sin k
8 2
22
Feed Force (approx.) (N) = 0.63 ∙ 2 ∙ 0.15 ∙ 2200 ∙ 1 ∙1 = 2286 n

Ff = 0.63 ∙ D ∙ f∙kc∙sin k∙kf Tc = L+h = 25+10 = 0.08 min/piece
2 Vf 434

Machining Time (min/piece) Cc = CMh ∙ Tc = 50 ∙ 0.08
60 60

Tc = L+h = 0.067 $/piece
vf

Machining Cost ($/piece) kc Values kc Value Material kc Value
Group
Cc = C6M0h ∙Tc Material 2000 900
Group 2100 19 1000
f Feed/rev mm/rev 2150 20 500
kc Material specific cutting force N/mm2 1 2200 21 800
Distance from drill point to workpiece 2 2200 22 800
h before feeding mm 3 2100 23 700
Depth of hole mm 4 2100 26 700
L Cost/machine hour $/h 5 2100 27 1700
CMh Machine efficiency % 6 2100 28 3000
90º }180° bottom drills 7 2500 31 3100
η 1 DR... 8 3250 32 3300
k 70º }140° point angle drills 9 2300 33 3300
sin k 0.94 10 2800 34 3200
k 11 2600 35 1700
sin k 12 1100 36 1700
13 1300 37 4600
Drill Geometry Coeficient 14 1100 38 4700
15 1800 39 4600
DCM DCN SCD 16 40 4500
17 41
km 1 0.85 0.85 18

kf1 0.85 0.85

184 ISCAR