Техническая информация Sumitomo - страница 11

Basics of Endmilling

• Parts of an Endmill

diameter Margin Radial secondary

clearance angle Neck length Center hole Length of cut Shank length

Overall length

Center Cut With Center Hole Rake face Rake angle Helix angle

Land End cutting edge cutting edge

End gash Rounded flute bottom Web

Center hole thickness Axial primary relief angle

Flute depth Chip pocket Axial secondary

clearance angle Ball radius Concavity angle of end cutting edge (*)

* Center area is lower than the periphery

• Calculating Cutting Conditions (Square Endmill)

(Ball Endmill)

• Calculating Cutting Speed

πxDCxn 1,000 x v Side milling Slotting

v = n = c

c 1,000 π x DC

• Calculating Feed Rate Per Revolution and Per Tooth

v

DC DC

• ae

Calculating Notch Width (D )

1

• v : Cutting speed (m/min)

Cutting speed and feed rate (per revolution c

π : ≈ 3.14 N

and per tooth) are calculated using the

DC : Endmill diameter (mm)

same formula as square endmill.

n : Spindle speed (min-1)

v : Feed rate (mm/min)

f

f : Feed rate per revolution (mm/rev)

DC f : Feed rate per tooth (mm/t) a Depth of cut z RE p RE z : Number of teeth a p

a : Axial Depth of Cut (mm)

p

pf RE : Ballnose Radius p f Pick feed