Machining

Question 1

Machining basics(5)

Answer 1

1. Leading edge of tool moves w/ constant speed (V) through material at fixed depth (t)
2. contour angle (beta): internal angle of tool
3. relief angle (alpha): angle b/w tool and material
4. rake angle(upsilon): angle b/w tool & 90 degree vertical
5. alpha + Beta + upsilon = 90 degrees

Question 2

The associated Forces are … & units

Answer 2

Tangential (F_h): allows to cut in horizontal direction
Vertical (F_v): keeps tool from “climbing” out of material

Force per unit depth

Question 3

F_v

Answer 3

Vertical force
The higher the rake angle, the more F_v required

Question 4

F_h =

Answer 4

1.5kt
3*F_v

k: shear yield stress
t: cutting depth

Question 5

optimal relief angle for various metals (steel, aluminum & plastic)

Answer 5

steel: 4 deg
Al : 6 deg
Plastics: 10 deg

Question 6

Methods(4)

Answer 6

1.Turning
2.Drilling
3.Milling
4.Machining Centers