TECHNICAL DATA

FUNCTION OF TOOL FEATURES FOR FACE MILLING
TECHNICAL
DATA
G018
TECHNICAL DATA
FUNCTION OF TOOL FEATURES
FOR FACE MILLING
yFUNCTION
OF EACH CUTTING EDGE
ANGLE IN FACE MILLING
Radial Rake Angle (R.R)
Corner Angle
(CH)
Axial Rake Angle
Lead
(A.R)
Angle
(EH)
Sub Cutting Edge Main Cutting Edge
True Rake Angle (T)
Cutting Edge
Inclination
(I)
Each Cutting Edge Angle in Face Milling
ySTANDARD
INSERTS
a Positive and Negative Rake Angle a Standard Cutting Edge Shape
Negative
Rake Angle
Neutral
Rake Angle
(-) 0°
(+ )
· Insert shape whose cutting edge
precedes is a positive rake angle.
· Insert shape whose cutting edge
follows is a negative rake angle.
Positive
Rake Angle
yCORNER
ANGLE (CH) AND CUTTING CHARACTERISTICS
Cutting Resistance (N)
SE300 Type
400 Type
SE415 Type
515 Type
ap
ae
Work Material
Cutting Resistance Comparison between
Different Insert Shapes
Standard Cutting
Edge Combinations
Axial Rake Angle
Radial Rake Angle
Corner Angle
True Rake Angle
Cutting Edge
Inclination
45°
0°
15°
Type of Angle Symbol Function Effect
A.R
R.R
CH
T
I
(+) Axial Rake Angle (-) Axial Rake Angle (+) Axial Rake Angle
(+)
Double Positive
(DP Edge Type)
(-)
Double Negative
(DN Edge Type)
Positive (large) :
Excellent machinability.
Minimal welding.
Negative (large) :
Poor machinability.
Strong cutting edge.
Positive (large) :
Excellent chip disposal.
Low cutting edge strength.
Radial Rake Angle Radial Rake Angle
Radial Rake Angle
(-)
Negative/Positive
(NP Edge Type)
Axial Rake Angle (A.R.) Positive ( + ) Negative (–) Positive ( + )
Radial Rake Angle (R.R.) Positive ( + ) Negative (–) Negative (–)
Insert Used
Positive Insert (One Sided Use) Negative Insert (Double Sided Use) Positive Insert (One Sided Use)
Steel
a – a
Cast Iron
– a a
Aluminium Alloy
a – –
Difficult-to-Cut Material
a – a
SE445 Type
545 Type
3000
2500
Corner Angle : 0° Corner Angle : 15° Corner Angle : 45°
2000
1500
Principal
Force
Principal
Force
Principal
Force
1000 Feed Force
Feed Force
Feed Force
500
0.1 0.2 0.3
Back Force
Back Force
0
-500
Back Force
fz (mm/tooth)
0.1 0.2 0.3
fz (mm/tooth)
0.1 0.2 0.3
fz (mm/tooth)
Workpiece : DIN 41CrMo4 (281HB)
Tool : ø125mm Single Insert
Cutting Conditions : vc=125.6m/min ap=4mm ae=110mm
Principal Force
Feed Force
Back Force
Table Feed
Three Cutting Resistance Forces in Milling
Corner Angle
Corner Angle
Corner Angle
Determines chip
disposal direction.
Determines
sharpness.
Determines
chip
thickness.
Determines
actual
sharpness.
Determines
chip disposal
direction.
The largest back force.
Bends thin workpieces and lowers
cutting accuracy.
* Prevents workpiece edge chipping
when cast iron cutting.
Back force is in the minus
direction. Lifts the workpiece when
workpiece clamp rigidity is low.
Corner angle 15° is recommended
for face milling of workpieces with
low rigidity such as thin workpieces.
Positive :
Excellent machinability.
Negative :
Excellent chip disposal.
Large : Thin chips and small
cutting impact.
Large back force.
Corner Angle 45°
Corner Angle 0°
Corner Angle 15°
* Principal force : Force is in the opposite direction of face milling rotation.
* Back force : Force that pushes in the axial direction.
* Feed force : Force is in the feed direction and is caused by table feed.