Water Jet Machining

Mr. Rahul R. PardeMr. Rahul R. Parde

Department of Production Department of Production EngineeringEngineering

SGGSIE&T, NandedSGGSIE&T, Nanded

Topic

Outline IntroductionIntroduction Working principle Working principle Working Working Main Parts Main Parts Cutting Materials?Cutting Materials? Advantages Advantages DisadvantagesDisadvantages Applications Applications Difference Difference

INTRODUCTION

Process in which mechanical energy of water Process in which mechanical energy of water is used for removing material.is used for removing material.

Process work on the principle of erosion Process work on the principle of erosion effects. effects.

Fastest growing machining processFastest growing machining processMethod of cutting materials using a waterjet Method of cutting materials using a waterjet

i.e. cutting tool i.e. cutting tool Used during fabrication of machine parts.Used during fabrication of machine parts.

Water Jet cutting MachineWater Jet cutting Machine

(b) A computer-controlled, water-jet cutting machine cutting a granite plate.

• Process works on the principle of erosion Process works on the principle of erosion effect of a high velocity & small diameter of effect of a high velocity & small diameter of water jet.water jet.

• Also this process works -Also this process works -

At jet velocity as high as-900m/sAt jet velocity as high as-900m/s

At pressure as low as (69-200Mpa) &At pressure as low as (69-200Mpa) &

At Inner dia. of nozzle – (0.07-0.5mm) At Inner dia. of nozzle – (0.07-0.5mm)

Working principle

Working

Main parts

IntensifierIntensifierAccumulatorAccumulatorOil PumpOil PumpWater jet nozzleWater jet nozzleXYZ Motion ControllerXYZ Motion Controller

Process performanceNo requirement of predrilled holeNo requirement of predrilled holeToo thick material can be cutToo thick material can be cutMachined surface have-Machined surface have-

-No burrs ,-No burrs ,

-No thermal damage &-No thermal damage &

-A good surface finish-A good surface finish

Cutting materials

Fig:- A water jet cutting a Fig:- A water jet cutting a

metal toolmetal tool

Materials commonly cut Materials commonly cut with a water jet include with a water jet include rubber, foam, plastics, rubber, foam, plastics, leather, composites, stone, leather, composites, stone, tile, metals, food, paper and tile, metals, food, paper and much more.much more.

Materials that cannot be cut Materials that cannot be cut with a water jet are with a water jet are tempered glass, diamonds tempered glass, diamonds and certain ceramics.and certain ceramics.

Advantages 

No HAZNo HAZProcess is safer Process is safer Pollution free processPollution free processCheaper than other processes.Cheaper than other processes.No need for re sharpening No need for re sharpening

tools.tools.

Disadvantages

Accuracy is poor (0.07mm)Accuracy is poor (0.07mm)Nozzle life is short Nozzle life is short very thick parts can not be cut very thick parts can not be cut not suitable to cut brittle material not suitable to cut brittle material

Food preparationFood preparationCutting asbestosCutting asbestosMostly used Mostly used

In shoe making industryIn shoe making industry

To cut lower strength materials To cut lower strength materials

Applications

(printed wire board)

WJM Examples

Waterjets v/s Lasers

After laser cutting

After waterjet cutting

Waterjets are safer. simpler MaintenanceWaterjets do not heat your part material. waterjets can machine many materials that lasers cannot.

Parts Made by WJM

Samples of parts various nonmetallic parts

1 Piece price US $25000-27000

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