Rohm Norm RN 1391 Informaciones Y Directivas Generales Para El Empleo De Instalaciones De Sujeción Accionadas Por Fuer página 48

2 | Reference Speed and Clamping Force Calculation
Calculation (example)
Having:
1. Workpiece and machining data:
Material
Clamping diameter (roughed):
Machining diameter:
Feed:
Depth of cut:
Distance cutting/clamp. points:
Speed:
2. Chuck data
KFD 200 power chuck jaws with diamond style clamping surface. Condition of
chuck: new (no special influencing parameters) External clamping with
UB-538-04 top jaws at mid-position of clamping range.
Find:
a) Required clamping force F
effect of turning speed)
b) Initial clamping force F
tionary
c) Actuating force
Solution
1. Main cutting force (Formula 2)
s ∙ t = from Table 1
k = from Table 2
c
Fs = s ∙ t ∙ kc = 0.5 ∙ 5 ∙ 2.50 = 6.25 kN
2. Required clamping force (Formula 1)
Safety factor S
Clamping coefficient μsp = from Table 4
Clamping ratio
3. Obtain the loss of the clamping force from the clamping force speed dia-
gram for KFD 200 at a speed of 3,000 rpm: F
next page.
4. Initial clamping force F
1.5 · (21 kN + 18 kN) = 58.50 kN S
F For diagram, see next page.
c.
48 / 138
= total clamping force required (without the
spz
= (total) initial clamping force with the chuck sta-
spo
= from Table 5
z
= from Table 3
= S · (F
spo sp
= C 45
d = 60 mm Ø
sp
d = 20 mm Ø
z
s = 0.5 mm
t = 5 mm
l = 50 mm
z
n = 3,000 rpm
6.25 kN 2.0 0.33
0.20
= 18 kN. For diagram, see
c
+ F ) (Formula 3) =
spz c
as per VDI recommendation 3106
sp
21.00 kN
RN-1391