abressive jet macine
TRANSCRIPT
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SUBMITTED BY:
VIKAS KR
VERMA(K11768)
VINOD NAGAR
VINOD KUMAR
SUBMITTED TO.
MR.ANUJ SIR
ASST.
PROFESSOR
CPU KOTA
CAREER POINT UNIVERSITY
KOTA
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INTRODUCTION:
It is the material removal process where the
material is removed by high velocity stream of
air/gas or water and abrasive mixture .
An abrasive is small, hard particle having
sharp edges and an irregular shape .
High velocity jet is aimed at a surface under
controller condition .
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COMPONENTS OF ABRASIVE JET MACHINING
Abrasive delivery system
Control system
Pump
Nozzle
Mixing tube
Motion system
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1. ABRASIVE DELIVERY SYSTEM
Auto abrasive delivery system has the
capability of storing abrasive & delivery the
abrasive to the bucket . It’s works auto
programming system by help of once
measuring record & no adjustment or fine
tuning system . High sensitive sensor gives
extremely reliable & repeatable .
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2.CONTROL SYSTEM
The control algorithm that computes exactly
how the feed rate should vary for a given
geometry in a given material to make a
precise part .
The algorithm actually
determines desired variation
in the feed rate & the tool
path to provide an extremely
smooth feed rate .
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3.PUMP
Crankshaft & intensifier pump are mainly
use in the abrasive jet machine .
The intensifier pump was the
only pump capable of reliably
creating pressures high .
Crankshaft pumps are more
efficient than intensifier pumps
because they do not require a power
robbing
hydraulic system ultra high pressure &
more stroke per minute .
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4.NOZZLE
All abrasive jet systems use the same basic two stage nozzle . First , water passes through a small diameter jewel orifice to form a narrow jet .
The abrasive particles are accelerated by the moving stream of water & they pass into a long hollow cylindrical
ceramic mixing tube.
Generally two type of nozzle
use , right angle head &
straight head .
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5. MIXING TUBE
The mixing tube is where the abrasive
mixes with the high pressure water .
The mixing tube should be
replaced when tolerances
drop below acceptable levels .
For maximum accuracy ,
replace the mixing tube
more frequently .
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6.MOTION SYSTEM
In order to make precision parts , an
abrasive
jet system must have a precision x-y table
and
motion control system .
Tables fall into three general categories .
Floor-mounted gantry systems
Integrated table/gantry systems
Floor-mounted cantilever systems
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WORKING PROCESS
High pressure water starts at the pump ,
and is delivered through special high
pressure plumbing to the nozzle .
At the nozzle , abrasive is introduced & as
the abrasive/water mixture exits , cutting is
performed .
Once the jet has exited the nozzle , the
energy is dissipated into the catch tank ,
which is usually full of water & debris
from previous cut .
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FIG . SCHEMATIC DIAGRAM OF AJM
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ADVANTAGES
Extremely fast setup & programming
No start hole required
There is only one tool
Low capital cost
Less vibration
No heat generated in work piece
Environmentally friendly
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DISADVANTAGES
Low metal removal rate
Due to stay cutting accuracy is affected
Abrasive powder cannot be reused
Tapper is also a problem
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CONCLUSION
The better performance , and the
applications represented above statements
confirm that
ABRASIVE JET MACHINING is continue
to expand .
The new software’s used to minimize time
and investments , there by making it
possible for more manufacturers of
precision parts to install AJM centers .