Water Jet Machining -Madan

8/8/2019 Water Jet Machining -Madan

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ABRASIVEWATERJETMACHINING

IMTIAZ A

INTC16 701


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What is meant by Abrasive?

Abrasives are fine particles( 0.025mm) of sharpedges.

Normally it is made up of Aluminium oxide or Silicon

Carbide.

Sharp edges is mainly to wear out the metal.

The below fig.1 gives the abrasive material shape

Fig.1 Typical shapes of garnet abrasive used for abrasive water-jet machining


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ABRASIVE WATER JET MACHINE


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FLOWOFJET IN AWJM

Fig2.1A jet moving at low speed is almost vertical Fig2.2 At high speed the jet bends on straight

and leaves a fine finish. But, cutting productivity is low lines, but. corners are damaged


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ABRASIVE WATER JET

An abrasive water jet is a jet of water whichcontains abrasive material. Usually the

water exits a nozzle at a high speed and the

abrasive material is injected into the jet

stream

However a high speed jet of a premixture of

the abrasive and the water would also bedefined as an abrasive water jet.


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Principle :

It is based on the principle oferosion of the material upon which the jet hits.

Description

Each of the two components of thejet, i.e. the water and the abrasive

material has both a separate

purpose and a supportive purpose. It

is the primary purpose of theabrasive material within the jet

stream to provide the erosive forces


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It is the primary purpose of the jet todeliver the abrasive material to the

workpiece for the purpose of erosion

the jet also accelerates the abrasivematerial to a speed such that the

impact and change in momentum of

the abrasive material can perform its

function.


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In addition it is an additional purpose

of the water to carry both the abrasivematerial and the eroded materialclear of the work area so thatadditional processing can beperformed.

The purpose of the abrasive water jetis to perform some machining orfinishing operation such as cutting,

boring, turning, etc.


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HOW IT WORKS??


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ABRASIVE WATER JETMACHINING VS CONVENTIONAL

MACHINING METHODS

In abrasive water jet machining material is

removed by erosion where as in conventional

it is removed by shearing.

Both conventional and abrasive water jet

machining, the liquid medium will also act as a

heat sink, taking heat away from the machiningarea.


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USESOFABRASIVE W ATER JET MACHINING

cutting of difficult-to-machine materials by abrasive water

jets milling and 3-D-shaping by abrasive water jets

turning by abrasive water jets

piercing and drilling by abrasive water jets

These operations are similar to just plain water jetmachining but because of special considerations such asthe type of material or shape complexity require theaddition of the abrasive phase. Operations where plainwater jet machining would be sufficient include:

cutting of materials such as plastics, thin metal, textiles,

deburring, surface peening


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Software for abrasive water jet machines

Software plays a key role in abrasive jet machining. Infact, it is only

through software that precision abrasive jet machining truly is possible.Some of the most significant advancements in the industry have been

in software

Early abrasive jet machinery was controlled with G-code controllers

much like any other numerically controlled machinery. The user had to

choose the feed rate at each point along the path, taking into accountthe material type and thickness and the cutting power of the particular

jet. The motion commands, other than for speed, could be generated

either automatically by a CAD-CAM program or by hand

This type of programming is used primarily for five-axis work and is

suitable for large production runs.


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Complex velocity profile generated by a cutting model. Speeds areindicated by color ranging from blue (slow) to white (fast).

Complex components can be machined in this process. The component shown

below can be machined


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Final part made in titanium


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Water Jet Machining -Madan

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