Page 186 - ISCAR(HOLE_MAKING_CATALOG_65)

USER GUIDE
SOLID CARBIDE DRILLS

General - Calculations

-1
Spindle Speed (min ) Example
c
n= v ∙1000 Drill DR 220-044-25-07-2D-N (Ø22 mm) - Material No. 4
π ∙ D

k=90º, sin k=1
2
kc=2200 N/mm
vc=200 m/min CMh=50 $/h η=0.75
Cutting Speed (m/min) km=1 kf=1 f=0.15 mm/rev L=25 mm h=10 mm
π ∙ D ∙ n
200 ∙ 1000
vc = 1000 n = vc ∙ 1000 π ∙ 22 = 2894 min -1
∙

π ∙ D

Table Feed (mm/min) vf = f ∙ n=0.15 ∙ 2894 = 434 mm/min
vf = f ∙ n
=
Q = vf ∙ π ∙ D 2 434 ∙ 3.14 ∙ (22) 2

4000

4000
3
Material Removal Rate (cm /min) = 165 cm /min
3
f
Q= v ∙ π ∙ D 2 Pc = Q ∙ Kc ∙ sin k
4000

60.000 ∙ η

= 65 ∙ 2200 ∙ 1 =8.06 kW

Power Requirement (kW) 60.000 ∙ 0.75
D 2
Pc = Q ∙ kc ∙ sin k Mc = f ∙ Kc ∙ ∙ sin k
10000

8

60.000 ∙ η

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

8
D
D 2
Mc = f ∙ k c 8 Ff = 0.63 ∙ ∙f ∙ Kc ∙ sin k
∙ ∙ sin k∙km
1000

2
22
= 0.63 ∙ ∙ 0.15 ∙ 2200 ∙ 1 ∙1 = 2286 n
2

Feed Force (approx.) (N)
D L+h 25+10
Ff = 0.63 ∙ ∙ f∙kc∙sin k∙kf Tc = = 434 = 0.08 min/piece
2

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

60
Tc = L+h = 0.067 $/piece
v f
Machining Cost ($/piece) kc Values
Material kc Value Material kc Value
Cc = C Mh ∙Tc Group Group

60
1 2000 19 900
2 2100 20 1000
f Feed/rev mm/rev 3 2150 21 500
kc Material specific cutting force N/mm 2 4 2200 22 800
Distance from drill point to workpiece
h 5 2200 23 800
before feeding mm 6 2100 26 700
L Depth of hole mm 7 2100 27 700
CMh Cost/machine hour $/h 8 2100 28 1700
η Machine efficiency % 9 2100 31 3000
k 90º }180° bottom drills 10 2500 32 3100
sin k 1 DR... 11 3250 33 3300
k 70º }140° point angle drills 12 2300 34 3300
sin k 0.94 13 2800 35 3200
14 2600 36 1700
Drill Geometry Coeficient 15 1100 37 1700
DCM DCN SCD 16 1300 38 4600
km 1 0.85 0.85 17 1100 39 4700
kf1 0.85 0.85 18 1800 40 4600
41 4500
184 ISCAR