abressive jet macine
TRANSCRIPT
SUBMITTED BY:
VIKAS KR
VERMA(K11768)
VINOD NAGAR
VINOD KUMAR
SUBMITTED TO.
MR.ANUJ SIR
ASST.
PROFESSOR
CPU KOTA
CAREER POINT UNIVERSITY
KOTA
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 .
COMPONENTS OF ABRASIVE JET MACHINING
Abrasive delivery system
Control system
Pump
Nozzle
Mixing tube
Motion system
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 .
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 .
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 .
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 .
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 .
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
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 .
FIG . SCHEMATIC DIAGRAM OF AJM
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
DISADVANTAGES
Low metal removal rate
Due to stay cutting accuracy is affected
Abrasive powder cannot be reused
Tapper is also a problem
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 .