WATER JET MACHINING Prepared by B.BALAMURALI AP/MECH

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WATER JET MACHINING Prepared by B.BALAMURALI AP/MECH SNS COLLEGE OF ENGINEERING, COIMBATORE- 641 107. DEPARTMENT OF MECHANICAL ENGINEERING WATER JET MACHINING Prepared by B.BALAMURALI AP/MECH ME 6004- UMP/ TOPIC-9 SNSCEME PRESENTATION

Explain the principle of AJM. Draw the AJM working diagram. RECAP Explain the principle of AJM. Draw the AJM working diagram. ME 6004- UMP/ TOPIC-9 SNSCEME PRESENTATION

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 6004- UMP/ TOPIC-9

WORKING OF WJM ME 6004- UMP/ TOPIC-9

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 6004- UMP/ TOPIC-9

ACTIVITY!!! Lets ………………. Pull ……………… It …………….. up……….. ME 6004- UMP/ TOPIC-9

ELEMENTS OF WJM Pump or Intensifier Accumulator Regulating chamber Nozzle Work material ME 6004- UMP/ TOPIC-9

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 6004- UMP/ TOPIC-9

ELEMENTS OF WJM Nozzle - Sintered Diamond, Tungsten carbide or Synthetic sapphire. - Exit diameter of nozzle (0.05 - 0.35 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 6004- UMP/ TOPIC-9

ELEMENTS OF WJM Work Material - Soft and non metallic materials like Paper boards, woods, plastics, rubber, Fibre glass, leather, etc., ME 6004- UMP/ TOPIC-9

WORK TIME ME 6004- UMP/ TOPIC-9

ME 6004- UMP/ TOPIC-9