Общий каталог Mitsubishi 2020 - 2021 - страница 1726

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y RAKE ANGLE

Rake angle is a cutting edge angle that has large effects on cutting resistance, chip disposal, cutting temperature and tool life.

Tool Life Tool Life Standard : VB = .016 inch Standard Depth of Cut : .039 inch Feed = .013 IPR VB = .016 inch Positive Rake Rake Angle Angle Rake Angle Rake Angle Cutting Resistance

Positive Insert 15° Vertical Force

6° Depth of Cut .079 inch

Vertical Force (N)Feed.008 IPR
Cutting Speed330 SFM
-10°
Rake Face Mean
Temperature
Depth of Cut.079 inch
Feed.008 IPR
Cutting Speed330 SFM
Negative RakeRake Angle (°)

Angle (-) Cutting Conditions Cutting Speed (SFM) Work Material : Alloy steel Grade : P10 Negative Insert : 0-Var-5-5-20-20-0.5 mm

Insert Cutting Conditions Grade : P10 Dry Cutting Depth of Cut : .039 inch Effects of Rake Angle on Feed : .013 IPR Work Material : Alloy steel Cutting Speed, Vertical Force,

Chip Disposal and Rake Angle Rake Angle and Tool Life and Cutting Temperature

a Effects of Rake AngleWhen to Increase Rake AngleWhen to Increase Rake Angle
in the Negative (-) Directionin the Positive (+) Direction
1. Increasing rake angle in the positive (+) direction
improves sharpness.u Hard work material.u Soft work material.
2. Increasing rake angle by 1° in the positive (+)u When cutting edge strength isu Work material is easily machined.
direction decreases cutting power by about 1%.required such as inu When work material or the
3. Increasing rake angle in the positive (+) directioninterrupted cutting and uncutmachine have poor rigidity.

lowers cutting edge strength and in the negative surface cutting. (-) direction increases cutting resistance. y FLANK ANGLE Flank angle prevents friction between flank face and work material resulting in smooth feed.

Rake Angle 6° vc = 655

Wear Depth Wear Depth Fracture

vc = 330 Flank Angle vc = 165

Large Flank W Small Flank W Cutting Conditions Flank Angle ($)

Small Flank Angle(SameLarge Flank Angle(SameWork Material : Alloy steel (200HB) Insert : 0-6-$-$-20-20-0.5 mm
Grade : P20Feed : .013 IPR
Flank angle creates a space between tool and work material.Depth of Cut : .039 inchCutting Time : 20 min

Flank angle relates to flank wear. Flank Angle and Flank Wear Relationship P

a Effects of Flank AngleWhen to Decrease Flank AngleWhen to Increase Flank Angle
1. Increasing flank angle decreases flank wearHard work material.Soft work material.
uu
occurrence.When cutting edge strengthWork material suffer from
uu
2. Increasing flank angle lowers cutting edgeis required.work hardening easily.

strength.