28-08-2013, 03:49 PM
CRYOGENIC GRINDING AND IT’S APPLICATIONS
[attachment=57539]
INTRODUCTION
The word ‘cryogenics’
‘cryo’,which means cold.
originates
from
Greek
word
Temperatures as low as -180oC are attained in cryogenic
systems.
The extremely low temperature are produced by using
substances called ‘cryogens 'such as liquid nitrogen and
liquid helium.
Cryogens are stored in vessels called as Dewar flask which
provides good insulation.
CRYOGENS AND IT’S APPLICATIONS
Cryogenic fuels such as liquid hydrogen are used as rocket
fuels and propellants.
Cryogens are used to achieve superconductivity in metals
such as tin and aluminium.
Cryogens are used for the preservation of bodies of animal
and humans. This process is called as cryopreservation.
Cryogens are used in food industry for food handling and
processing.
Cryogens are used in various machining operations such as
cryogenic deburring, cryogenic deflashing, cryogenic
tempering and cryogenic grinding.
Cryogens like liquid nitrogen are used in special chilling and
freezing applications.
CRYOGENIC GRINDING PROCESS
Cryogenic grinding , also known as freezer milling/
freezer grinding/ cryomilling is the act of cooling or
chilling a material and then reducing it to smaller
particle size.
Almost all materials embrittle when exposed to low
temperature. Cryogenic size reduction utilizes the
cooling effect of liquid nitrogen to embrittle materials
prior to and or during the grinding process.
Materials which are elastic in nature, which have low
melting points, which have low combustion
temperatures and which are sensitive to oxygen can
be ideally machined by cryogenic grinding process.
CONCLUSION
Cryogenic grinding improves product quality by
controlling thermal effects.
Oxidation and surface burning are eliminated.
Surface damage is eliminated.
Finer particle size is achieved.
Material removal rate is high.
The process is economical in the long run.
[attachment=57539]
INTRODUCTION
The word ‘cryogenics’
‘cryo’,which means cold.
originates
from
Greek
word
Temperatures as low as -180oC are attained in cryogenic
systems.
The extremely low temperature are produced by using
substances called ‘cryogens 'such as liquid nitrogen and
liquid helium.
Cryogens are stored in vessels called as Dewar flask which
provides good insulation.
CRYOGENS AND IT’S APPLICATIONS
Cryogenic fuels such as liquid hydrogen are used as rocket
fuels and propellants.
Cryogens are used to achieve superconductivity in metals
such as tin and aluminium.
Cryogens are used for the preservation of bodies of animal
and humans. This process is called as cryopreservation.
Cryogens are used in food industry for food handling and
processing.
Cryogens are used in various machining operations such as
cryogenic deburring, cryogenic deflashing, cryogenic
tempering and cryogenic grinding.
Cryogens like liquid nitrogen are used in special chilling and
freezing applications.
CRYOGENIC GRINDING PROCESS
Cryogenic grinding , also known as freezer milling/
freezer grinding/ cryomilling is the act of cooling or
chilling a material and then reducing it to smaller
particle size.
Almost all materials embrittle when exposed to low
temperature. Cryogenic size reduction utilizes the
cooling effect of liquid nitrogen to embrittle materials
prior to and or during the grinding process.
Materials which are elastic in nature, which have low
melting points, which have low combustion
temperatures and which are sensitive to oxygen can
be ideally machined by cryogenic grinding process.
CONCLUSION
Cryogenic grinding improves product quality by
controlling thermal effects.
Oxidation and surface burning are eliminated.
Surface damage is eliminated.
Finer particle size is achieved.
Material removal rate is high.
The process is economical in the long run.