APRELIMINARY

PRESENTATION ON

Shri S’ad Vidya Mandal Institute Of TechinologyBHARUCH – 392001.

“INSTRUMENTATION OF ABRASIVE JET MACHINE”

Guided By : SHRI H.G.SHAH

Prepared By: KACHHADIYA DHIRAJ V. [000009]

PATEL NIMESH H. [000031]

SHAH RAKSHIT M. [000039]

SUKANI SUNNY R. [000043]

VAGHASIYA RAVI [000046]

INTRODUCTION TO AJM

What is AJM ?

Working of AJM ?

BLOCK DIA OF WORKING OF AJM

APPLICATION OF AJM

In cutting slots

Thin sections, contouring

Drilling

For producing shallow crevices

For producing intricate shape in hard and Brittle materials

Often used for cleaning and polishing of plastic, nylon and Teflon components

Etching of marking on glass cylinder

Gas

ADVANTAGE OF AJM

Ability to cut intricate hole shape.

Ability to cut fragile & heat sensitive

material without damage as no heat is

generated due to passing of gas or air.

Low capital cost.

DISADVANTAGE OF AJM

MRR is slow.

Limited application.

Machining accuracy is poor.

Nozzle wear rate is high.

Additional cleaning of work

surface may required.

INSTRUMENTATION

What is instrumentation ?

WHICH PARAMETERS WILL BE ADDED IN

THE EXISTING MACHINE?

FLOW METER

VIBRATOR

ABRASIVE MATERIAL

ABRASIVE GRAIN SIZE

STAND OF DISTANCE

PRESSURE REGULATING VALVE

FLOW METER

The material removal rate can be improved by increasing the abrasive flow rate provided the mixing ratio can be kept constant as shown in Chart - (2). The mixing ratio can be kept unchanged only by a simultaneous increase of both gas and abrasive mass flow.

CALIBATED VIBRATOR Calibrated vibrator is used for proper mixing of abrasive particles in the air stream is provided vibrating motion to the mixing chamber.

Our vibrator including linear vibrating feeder have the advantages of stable vibration, reliable working, and long service life and so on. Vibrating machine can provide materials evenly for crushing machinery, and make coarse separation.

DIFFERENT ABRASIVE MATERIALS

Aluminum Oxide, Al2O3.

Silicon Carbide, Sic.

Boron Carbide, B4C.

Cubic Boron Nitride, CBN.

Diamond.

SHAPE AND SIZE OF ABRASIVE

Blocky Shape (High Bulk density)

Blocky Shape (Medium Bulk density)

Sharp Shape (Low Bulk density)

Platelet Shaped

Extreme Shapes

GRAPH OF MRR V/S ABRASIVE FLOWRATE

GRAIN SIZE 10µ

25µ

50µ

ABRASIVE FLOWRATE

MRR

MIXING RATIO CONSTANT

MIXING RATIO

MRR MRR

ABRASIVE FLOWRATE

DIFFERENT GRAPH THEORITICALLY

VARYING STAND OFF DISTANCE

At starting the MRR increases with increase STD up to certain limit then it will be constant for some limit and after that MRR decreases with respect to STD.

MRR

Gas pressure

PRESSURE REGULATING VALVE

From the graph we conclude that With the help of pressure regulating valve gas pressure increases the MRR is also increases.

FUTURE WORK

Install the flow meter and vibrator.

Perform the experiment.

REFRENCES

“Manufacturing Science”

-AMITABHA GHOSE

-ASOK KUMAR MALIK

“New Technology”

-AMITABH BHATTACHARYA

“Production Technology”

-P.C.SHARMA

REFRENCES

WWW.UAMA.ORG/ABRASIVES 1O1

WWW.EOD.GVSU.EDU/EOD

WWW.FLOWMETERS.COM