1. WATER JET MACHINING Prepared by B.BALAMURALI AP/MECH
SNS COLLEGE OF ENGINEERING, COIMBATORE   DEPARTMENT OF MECHANICAL ENGINEERING  
WATER JET MACHINING Prepared by B.BALAMURALI AP/MECH
ME UMP/ TOPIC-9
SNSCEME PRESENTATION

2. Explain the principle of AJM. Draw the AJM working diagram.
RECAP
Explain the principle of AJM.
Draw the AJM working diagram.
ME UMP/ TOPIC-9
SNSCEME PRESENTATION

3. WATER JET MACHINING
The high velocity of water jet comes out of the nozzle and strikes the material, its kinetic energy is converted into pressure energy including high stresses in the work material.
When this stress exceeds the ultimate shear stress of the material, small chips of the material get loosened and fresh surface is exposed.
ME UMP/ TOPIC-9

4. WORKING OF WJM
ME UMP/ TOPIC-9

5. WORKING OF WJM
A pump or intensifier is used to increase the pressure of the water and the water passes on to the accumulator from the pump.
Water under pressure from a hydraulic accumulator is passed through the orifice of the nozzle to increase its velocity.
The high velocity of water jet comes out of the nozzle and strikes the material, its kinetic energy is converted into pressure energy including high stresses in the work material.
When this stress exceeds the ultimate shear stress of the material, small chips of the material get loosened and fresh surface is exposed.
ME UMP/ TOPIC-9

6. ACTIVITY!!! Lets ………………. Pull ……………… It …………….. up………..
ME UMP/ TOPIC-9

7. ELEMENTS OF WJM Pump or Intensifier Accumulator Regulating chamber
Nozzle
Work material
ME UMP/ TOPIC-9

8. ELEMENTS OF WJM Pump or Intensifier - Raise the pressure of water.
- Range 1500 to 4000 N/MM2
Accumulator
- Store the water and also helps in eliminating pulsation.
Regulating chamber
- Incorporated in the line to control the flow of water jet to the nozzle.
ME UMP/ TOPIC-9

9. ELEMENTS OF WJM
Nozzle
- Sintered Diamond, Tungsten carbide or Synthetic sapphire.
- Exit diameter of nozzle ( mm)
- Exit velocity of water jet varies up to 920m/s.
- SOD (2 – 50mm)
- Mass Flow Rate – 8lit/min
- MRR – 0.6mm3/s
- Feed rate – (1 – 4 mm/s)
ME UMP/ TOPIC-9

10. ELEMENTS OF WJM Work Material
- Soft and non metallic materials like Paper boards, woods, plastics, rubber, Fibre glass, leather, etc.,
ME UMP/ TOPIC-9

11. WORK TIME
ME UMP/ TOPIC-9

12. ME UMP/ TOPIC-9