Abressive Jet Machining by Himanshu Vaid

1. A
Presentation on
“ABRESSIVE JET MACHINING”

2.  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 .
WHAT IS ABRASIVE JET MACHINING

3.  Abrasive delivery system
 Control system
 Pump
 Nozzle
 Mixing tube
 Motion system
COMPONENTS OF ABRASIVE JET
MACHINING

4. 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 .

5. 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 .

6. 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 .

7. 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 .
 ceramic mixing tube.
 Generally two type of nozzle
use , right angle head &
straight head .

8. FIG. OF NOZZLE
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9. 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 .

10. 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

11. 6. 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 .

12. FIG . SCHEMATIC DIAGRAM OF
AJM

13. ADVANTAGES OF AJM
 Extremely fast setup & programming
 No start hole required
 There is only one tool
 Low capital cost
 Less vibration
 No heat generated in work piece

14. DISADVANTAGES OF AJM
 Low metal removal rate
 Due to stay cutting accuracy is affected
 Abrasive powder cannot be reused
 Tapper is also a problem

15. 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 .

16. Thankyou