Presentation CHANNU

8/2/2019 Presentation CHANNU

1/23

BY

CHANNAVEERAYYA MATHPATI


2/23

Introduction AWJM Machine

Mixing

Suspension jet

Catcher Mechanism of material removal

Specifications of different water jet cutting machines

Applications

Environmental issues and future

Advantages of AWJM

Conclusion

References

CONTENTS


3/23

INTRODUCTION

Water Jet Machining (WJM) and Abrasive WaterJet Machining (AWJM) are two non-traditional ornon-conventional machining processes.

They belong to mechanical group of non-conventional processes like Ultrasonic Machining(USM) and Abrasive Jet Machining (AJM).

In these processes (WJM and AJWM), themechanical energy of water and abrasive phasesare used to achieve material removal or

machining


4/23

MACHINE

1. LP Booster

2. Hydraulic drive

3. Additive mixer

4. Direction control

5. Intensifier

5A.LP Intensifier

5B.HP Intensifier

6. Accumulator

4

3

1 ,2

5

6

5B 5A


5/23

Intensifier Schematic and photographic view

of the cutting head


6/23

MIXING

Schematic view of mixing

process

WATER JET

MIXINGCHAMBER

FOCUSINGTUBE

TRAJECTORY OFABRASIVEPARTICLE

INTERACTIONWITH

FOCUSING TUBE


7/23

SUSPENSION JET

hp waterfrom pump

Pressurevalve

Suspension

Hp water

frompump

Pressure vessel

Abrasive

Restrictionvalve

By pass

Schematic of AWJM (Suspension type)


8/23

CATCHER

some typical catchers

(a) water basin (b) steel/WC/ceramicballs

(c) catcher plates


9/23

MECHANISM OF MATERIAL

REMOVAL

Photographic view of kerf

(longitudinal section)

bt

burr bb

Schematic of AWJM kerf


10/23


11/23

PARAMETERS AFFECTING CUTTINGPERFORAMANCE OF THE AWJM

Waterjet nozzle diameter.

Supply pressure.

Abrasive parameters. Abrasive material.

Stand off distance.

Impingement angle. Depth of cut.


12/23

Specification of different water jet

cutting machinesAbrasive garnet for

water jet cuttingHigh Performance

Abrasive Garnet for

Waterjet Cutters

> 95% purity,

hardness > 7.0

US$195/ton

FOB China

US$295/ton

FOB Los Angeles

20 ton (44,000

pound) minimum

order

High pressure water jet

pump

High Pressure Waterjet

Pump Sub-System

55kpsi, 50HP

37kw, 3 phase

3.2L/min

(0.9Gal/min) flow

rate

Starting at US$19,500


13/23

Water jet intensifier

pump

Starting at US$8,500

Fully assembled cutting

head

Fully Assembled Cutting

Head with on/off valve

Starting at US$800

Water intensifier

promotion parts

High pressure waterjet

intensifer parts: ceramic plungers

high/low pressure

cylinders

high/low pressure seal

kit End bell

check valve Assembly

Hydraulic Piston

manifold

shift valve

On sale now


14/23


15/23


16/23

Stainless steel plate

(50 mm thick) machined with

AWJ Different engineeringcomponents machined with

AWJ


17/23

Different engineering components machined with AWJ


18/23


19/23

Advantages

AWJM process maintains tighttolerances and produces partsquickly.

AWJM produces no heat affectedzone.

Clean edges are produce.

Up to 40 plies can be cut. Computer controlled.

Generates no dust.


20/23

Limitations

Abrasives cannot be reused.

Slight moisture pick up can takesplace.

Material removal rate is very low


21/23

Conclusion

The industry enjoys a reduction in replacement tooling costs,because more precision cutting is shifted to the water jet andless is being cut with the carbide cutting tools, the toolingexperiences less wear.

Water jets are suitable for cutting high-strength materials intointricate shapes because relatively high cutting rates can beachieved.

The same water jet tool can be used on a variety of thesematerials simply by changing the cutting rate.

Thus this process can be widely used for fabrication of a largevariety of components cost effectively and efficiently.


22/23

References

[1]. Modern Machining Processes by PANDEY and SHAN, TATAMcGraw Hill 2000

[2]. Elements of Workshop Technology vol.2: Machine tools by S.

K. HAJRA CHOUDHARY,A. K. HAJRA CHOUDHARY,

NIRJHAR ROY, Media Promoters and Publishers.

[3]. www.howstuffworks.com

[4]. www.thefabricator.com

[5]. www.thomasnet.com

[6]. www.omax.com


23/23

Presentation CHANNU

Documents

Transcript of Presentation CHANNU