Техническая информация Sumitomo - страница 7

Technical Guidance
Milling Edition Basics of Milling
■ Parts of a Milling Cutter
Body diameter
Boss diameter
Hole diameter
Keyway width
Body
Keyway depth Corner angle


Cutter height
Axial rake angle

Ring
Approach Angle
Reference ring

True rake Cutting edge inclination
Face angle angle angle
Clamp bolt
relief
Indexable insert A
Chip pocket
Peripheral
Cutter diameter (nominal diameter) relief angle
Locator
Clamp
A


Reference ring
Face cutting External
edge angle cutting edge
(Principal
cutting edge)
Radial rake angle Face cutting
edge Chamfer
(Wiper cutting
edge)


■ Milling Calculation Formulas ● Calculating Cutting Speed
π × DC × n DC
Cutter
Work
material
vc=
1,000 vc : Cutting speed (m/min)
n
1,000 × vc π : ≈ 3.14 vf
n=
π × DC DC : Cutter diameter (mm) n
● Calculating Feed Rate n : Rotational speed (min-1)
vf : Feed rate per minute (mm/min)
ap


vf =fz × z × n
fz : Feed rate per tooth (mm/t)
vf z : Number of teeth
fz =
z×n fz
vf


● Power Requirement ● Relation Between Feed Rate, Work Material, Specific Cutting Force
Symbol
a ×a ×v ×k Q × kc
Pc= e p 6 f c = Work Material
60 × 10 × η 60 × 10 3 × η 10.000
No. Alloy Steel Carbon Steel Cast Iron Aluminium Alloy
(1) 1.8 0.8 200 Q
(2) 1.4 0.6 160 Q
(3) 1.0 0.4 120 Q
Pc : Power requirement (kw) 8.000 Figures in table indicate these characteristics.
· Alloy steel and carbon steel: Traverse rupture strength σ B(GPa)
H : Required horsepower (HP)
● Horsepower Requirement Q : Chip removal amount (cm3/min)
· Cast iron: Hardness HB
Pc 6.000
H= ae : Cutting width (mm)
Specific Cutting Force


0.75
vf : Feed rate (mm/min)
(MPa)


4.000
ap : Depth of cut (mm)


( )
kc : Specific cutting force (MPa)
● Chip Removal Amount Rough value Steel: 2,500 to 3,000MPa 2.000

Q=
ae × ap × vf
1,000
Cast iron: 1,500MPa
Aluminium: 800MPa N
η : Machine efficiency (about 0.75) 0 0.1 0.2 0.4 0.6 0.8 1.0
Technical Guidance /


0.04
Feed Rate (mm/t)
References


N15