What are the main machining operations?
Turning on lath
Milling
Drilling
Grinding
What are the parameters of a turning operation?
Cutting speed v
Feed a
Depth of cut h
What are the two variants of Milling?
Periphal milling
Face milling
What are the parameters of milling?
workpiece speed v_a
depth of cut d
feed per tooth of the cutter f=v_a/nz
cutting time t
How is the cutting force calculated?
b=width
t=thickness(of removed material)
u=specific cutting energy
Which abrasives are used in grinding?
Al2O3, SiC, PCD (polychristalline diamond), cBN
What are the two variants of grinding?
Cylindrical grinding, Surface grinding
Which force is used to model machining operation?
shear force shearing of particles
Which forces are applied onto the material in a machining operation?
cutting and thrust force
How high is the rough temperature increase in the most critical regions in steel cutting?
750K
What are the types of wear on a cutting tool?
Crater & Flank wear
How can the flank wear be described?
v=cutting speed
t=time
n=constant depending on material
C=constant depending on cutting conditions
n&C determined empirically
What materials are used for cutting tools?
What are there characteristics?
cold working steels
used at low cutting speeds
High speed steels
often coated, soften when temp is too high
Hard metals
inserted as plates
Ceramics
Alumina and silicon nitride
Last changed9 months ago
