Техническая информация Sumitomo - страница 9

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  • Relation Between Engagement Angle and Tool Life

Large Diameter Small Diameter

Work material feed direction V

f f f

Rotation DC DC

DC

E E Small Large Engagement angle E Insert

f The Engagement angle denotes the angle f

at which the full length of the cutting edge

comes in contact with the work material, E

with reference to the feed direction. Small E Large

  • The larger E is, the shorter the

0.4 tool life. 0.6 0.3 FC250

  • To change the value of E: S50C

0.2 0.4

1) Increase the cutter size.0.10.2
2) Shift the position of the cutter.

-30° 0° 30° 60° -20° 0° 20° 40° 60° 80°

Engagement Angle Engagement Angle

  • Relation between the number of simultaneously engaged cutting edges and cutting force: Normally, cutting width is considered to be appropriate with 70 to 80% of the cutter diameter engaged as shown in example

d). However, this may not apply due to the actual rigidity of the machine or work piece, and machine horsepower.

a) b) c) d) e)

Time Time Time Time Time

Cutter

  • 0 or 1 edge in
  • Only 1 edge in
  • 1 or 2 edges in
  • 2 edge in
  • 2 to 3 edges in
contact at samecontact at any time.contact.contact at anycontact.
time.time.
■ To Improve Surface Roughness●●
Surface roughness without wiper flatInfluence of different face angles on surface finish
(1) Inserts with wiper flat · Work : SCM435
Feed rateFeed rate

per tooth per tooth Cutter: DPG5160R

When all the cutting edges (Single tooth) H (A) have wiper flats, a few teeth are C

  • vc = 154m/min

intentionally elevated to play the fz = 0.234mm/t

  • Surface roughness with straight wiper flat a = 2mm

role of a wiper insert. p

Feed rate Feed rate Face Cutting Edge Angle

per tooth per tooth

  • Insert equipped with straight wiper flat (A): 28'

(B) (B): 6'

(Face angle: 15' - 1°)

×2,000

  • Insert equipped with curved wiper flat

H F ×100

(Curvature ≈ R500 (example))

h: Projection value of wiper insert() Effects of having wiper insert (example)

(2) Wiper insert assembling system Fc: 0.05mm Wiper insert

Al: 0.03mm(Only· Work : FC250
normal×1,000

A system to protrude one or 20 Cutter: DPG4100R

Normal teeth) 20

two inserts (wiper inserts) with HW teeth (C) 15 Insert : SPCH42R

10 a smooth curved edge just a Face run-out : 0.015mm h 5

  • Radial run-out: 0.04mm

little beyond the other teeth Feed rate per rev. N

  • vc = 105m/min
to wipe the milled surface.f : Feed rate per revolution (mm/rev)(With 1
×1,000fz = 0.29mm/t
wiper
(Applies to WGC, RF types, etc.)insert)2020(1.45 mm/rev)

(D) 15 (C) : Only normal teeth H 10 C (D) : With 1 wiper insert

5 H W Hc: Surface roughness with only normal teeth Hw: Surface roughness with wiper insert