Каталог Dormer Pramet фрезерование 2021 - 2022 - страница 770

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As stated above, chip thickness h changes during a single revolution thickness h is dependent on the type of milling cutter and on endepending on the angle j in line with the formula hj = f × sinj. gagement conditions, particularly the ratio of ma /DC, feed per tooth

Maximum chip thickness with steady f is reached within the axis of zf and naturally also on the entering angle KAPRek . The following
the milling cutter. The average thickness of a chip (zh ) removed byfigure shows illustrative examples.zr
one tooth during one revolution is calculated as the height of a recm-
tangle with the same area as the area under a sine curve relative to
the radial depth of cut a . Average chip
e
ab
hhj = f.sin jhj = f.sin j
jzhjz
hfhf
mzmz
h= 0,64 . fh
hmzm
m
h = 0h = 0h' > 0h' > 0
1212
h= fh= f
maxzvmaxzv
ff
jjf
DCDC
vv
cc
a = DCa
ee
cd
hj = f.sin jh j = f.sin j
hjzh jz
hfhf
mzmz
h
hm
m
h'‚ > 0h'' = 0h' > 0h' > 0
1212
h = fh=f
maxz vmaxv z
ff f
jj
DC
fDC
vv
cc
ma
e
e
hj = f.sin j
hjz
hf
mz
h
m
h'' > 0h'' = 0
12
f
v z
f
DC
j
v
c
a
e

a e Average chip thickness h for milling (with the centre) in accordance with figure a, b, d is calculated based on the formula: m

a

e

h = f . sin k 57.3

m z r a

DC . arcsin . e DC Average chip thickness h for machining with the side of the milling cutter (figure c, e) is calculated based on the formula: m

a

h= f . sin k. 114.6 .e
mzr2a
DC . arccos . 1-e
DC
For milling with the side of the cutter in line with figure e, where the a /DC ratio is very low < (0.2), average chip thickness h can be calculated
using the simplified formula:em
a
h= f sin ke
mzrDC

Where:

hIs average chip thickness [mm]
f mFeed per tooth [mm/tooth]
azRadial depth of cut [mm]
DCeDiameter of the milling cutter [mm]
kEntering angle of the main cutting edge (KAPR) [°]

r