Highspeed and hard Machining

Question 1

In milling we get breakes for each cutting egde, why is this good=

Answer 1

This allows for the cutting edge to cool off which decreases the risk of thermal damage/thermal cracking in the cutting tool.

Question 2

advantages of hsm?

Answer 2

Temperature is reduced in tool and workpiece=>acceptable toolwear trots speed, Reduction in the thermally
Low forces => diminished tool reflection, thin wall sections are more feasible
Accuracy increases due to reduced chip load.
Improved surface roughness
Productivity:
Higher removalrates, less operations, shorter lead times.
Simplified tooling

Question 3

Cutting tools for hsm?

Answer 3

Carbides:Solid tools and insertss
Precision: Balancing, cleanliness, handling
Short: higher att high rpms
Thicker shafts: for small tool diameter
Fine grain carbide
Needs to have good thermal and frictional attributes.

Question 4

Benedits hard turning

Answer 4

Flexibility
Quick changeovers between component typer
several operations performed in one setup
lower investments compared to grinding
Enhanced machining quality
Environmentally friendly- dry machining possible

Question 5

Drawbacks from hard turning.

Answer 5

Tooling cost per unit
Surface finish decreases with tool wear
White layer on the top(makes surface brittle and gives cracks)

Question 6

Hard cutting vs grinding?

Answer 6

accuracy-grinding
surface-grinding
reliability-grinding
residual stress-grinding
Environment-hc
subsurface dmg-hc
setup time-hc
flexibility-hc
material removal-hc