Presentation on Manufacturing Technology

Presented By:-Ketan Pitrubhakta Water Jet Cutting

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Also called Hydrodynamics Machining.Water jet cutting technology is one of the fastest growing major machine tool processes in the world due to its versatility and ease of operation.The Water jet process provides many unique capabilities and advantages that can prove very effective in the cost battle.Water jets are used in high production applications across the globe. Water jet cutting

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Generally it is categorized in two types1. Pure water jet cutting High pressurized water is used as cutting media2. Abrasive water jet cutting Fine particles of granite or alumina are used along with high speed water stream

Types of water jet cutting

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They use the technology of high-pressure water being forced through a small hole (typically called the orifice or jewel) to concentrate an extreme amount of energy in a small area.The inlet water for a pure water jet pressurized between 20,000 and 60,000 Pounds Per Square Inch (PSI) (1300 to 6200 bar.)This is forced through a tiny hole in the jewel, which is typically 0.007 to 0.0020 in diameter (0.18 to 0.4 mm).Travelling as close to the speed of sound (about 600 mph or 960 km/hr)Basic water jet principals

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Design of water jet nozzle Design of a pure water jet nozzle Design of an abrasive water jet nozzle

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In abrasive water jet cutting abrasive particles are added along with the high speed water stream.The beam of water accelerates abrasive particles to speeds fast enough to cut through much harder materials.Basic water jet principals

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The forces of the water and abrasive erodes the materialThe cutting action is greatly enhanced if the abrasive jet stream is moved across the material.The ideal speed of movement depends on The materialThe shape of the partThe water pressure and the type of abrasive.Controlling the speed of the abrasive jet nozzle is crucial to efficient and economical machining.Working

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A typically water jet nozzle

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Fast setup and programmingAlmost no heat generated on your partNo mechanical stressesAre very safeEnvironmentally friendlyThis process is suitable for cutting all materials. Even diamond can be cut by using diamond powder as abrasive.Due to low velocity of particles, the rate of impact is negligible. Thus, very thin and brittle materials can be cut without any risk of breaking.

Advantages

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Cutting hard metals such as tool steel seriously affects the cutting speed, therefore water jet cutting is not an efficient method of machining these hardened materials.Cutting thick materials results in a taper down the cut resulting from the water jet widening as it get further away from the nozzle. This means dimensional accuracy in thick cuts becomes a problem.

Disadvantages

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Parts made by water jets

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ArchitecturalAerospaceManufacturingAutomotiveElectronics

Where water jet are used

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Relatively new technology has caught on quickly and is replacing century-old methods for machining.Used not only in typical machining applications, but food and soft-goods industriesAs material and pump technology advances faster cutting rates, longer component life and tighter tolerances will be achievableGave us the way for new machining processes that embrace simplicity and have a small environmental impactCONCLUSION

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Abrasive water jet Cutting

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