A Presentation on

“ABRESSIVE JET MACHINING”

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

Abrasive delivery system

Control system

Pump

Nozzle

Mixing tube

Motion system

COMPONENTS OF ABRASIVE JET

MACHINING

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 .

ceramic mixing tube.

Generally two type of nozzle use , right angle head & straight head .

FIG. OF NOZZLE

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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 .

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

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 .

FIG . SCHEMATIC DIAGRAM OF AJM

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

DISADVANTAGES OF AJM

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 .

Thankyou