abressive jet macine

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 .