30-12-2010, 02:37 PM
Submitted by
SUHAIB THALEKKARA MARUTHURU
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OBJECTiVES
INTRODUCTION
PROBLEMS IN CONVENTIONAL GRINDING
WORKING
ADVANTAGES OF CRYO GRINDING
EXPERIMENTAL STUDIES
APPLICATION
CRYOGENICS
The term “ Cryogenics” originated from the Greek word which means creation or production by means of cold. Cryogenics is the study of very low temperatures or the production of the same.. Liquid nitrogen is the most commonly used element in cryogenics and is legally purchasable around the world.
APPLICATIONS OF CRYOGENICS
In Gas Industry
As the source of gas
As Rocket propellant
In Biology
In Food Industry
In Electronics
In Medicines
In Grinding
GRINDING
The process is carried out with a grinding wheel made up of grits for removing materials from work piece surface.
Grinding can be classified into two types
Grinding for material removal
Grinding for powdering
PROBLEMs IN CONVENTIONAL GRINDING PROCESS
High heat generation
Introduction of tensile residual stress
Less tool life
Clogging and Gumming of the mill
Oxidation
Loss of Etheric oil in Spice grinding
CRYOGENIC GRINDING …..also known as Freeze Grinding
Cryogenic grinding involves cooling a material below its embrittlement temperature with cryogenic fluid. Typically Liquid Nitrogen or in certain applications, liquid Carbon Dioxide is used.
This process has several benefits
Ability to process soft or elastic material
Increased productivity
Low Power Consumption
Smaller size particle
Minimal loss of volatile component
