Abrasive cutting methods Flashcards
1
Q
Grinding: Differences to cutting
A
- small cutting depth
- sharp cutting edge
- high cutting speed
- low energy efficiency
- high temperature
- most heat transferred to WP, leas to chips
–> small depth requires sharp cutting edge
2
Q
Characteristics of grinding materials
A
- Hardness
- Toughness
- Temperature resistance
- Neutrality
- Breaking
3
Q
Common abrasive materials
A
- aluminium oxide (Al2O3)
- -> hard and tough
- silicon carbide (SiC)
- -> hard and brittle
- boron nitride (CBN)
- -> hard and temperature resistant
- diamond
- -> hardest, reactive
4
Q
Grinding wheel dressing
A
- sharpening
- with diamond tip, dressing disc or steel roll
- because of rounded grains, wrong form, clogging (Verstopfen)
5
Q
Grinding problems
A
- feed marks (wheel center not parallel to table)
- chatter marks (vibrations)
- comma sign (granis in coolant)
- dull grinding wheel (foo fine oder dressed with dull tool)
- angular marks (non-circular wheel)
- burning marks (to little coolant)
6
Q
Centerless grinding
A
Loose workpiece between grinding wheel and regulation wheel, supported by supporting blade
7
Q
Honing
A
- honing stones
- radial feed, wedge mechanism
- oil as cutting fluid (high volume, low pressure)
- low cutting speed and temperature
- large cutting area
- self centering tool
- low costs
8
Q
Lapping
A
Loose abrasive grains between workpiece and rotating pressure plate
9
Q
Finishing methods
A
- super finishing
- abrasive mass finishing
- barrel tumbling
- vibratory finishing
- centrifugal barrel finishing
