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A BRASIVE JET MACHINING

A BRASIVE JET MACHINING. It is the material removal process where the material is removed by high velocity stream of air/gas or water and abrasive mixture . An abrasive is small, hard particle having sharp edges and an irregular shape .

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A BRASIVE JET MACHINING

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  1. ABRASIVE JET MACHINING

  2. It is the material removal process where the material is removed by high velocity stream of air/gas or water and abrasive mixture . • An abrasive is small, hard particle having sharp edges and an irregular shape . • High velocity jet is aimed at a surface under controller condition . What is abrasive jet machining ?

  3. Abrasive delivery system • Control system • Pump • Nozzle • Mixing tube • Motion system componentsofabrasivejetmachining

  4. Auto abrasive delivery system has the capability of storing abrasive & delivery the abrasive to the bucket . It’s works auto programming system by help of once measuring record & no adjustment or fine tuning system . High sensitive sensor gives extremely reliable & repeatable . abrasive delivery system

  5. The control algorithm that computes exactly how the feed rate should vary for a given geometry in a given material to make a precise part . • The algorithm actually determines desired variation in the feed rate & the tool path to provide an extremely smooth feed rate . 2.Control system

  6. Crankshaft & intensifier pump are mainly use in the abrasive jet machine . • The intensifier pump was the only pump capable of reliably creating pressures high . • Crankshaft pumps are more efficient than intensifier pumps because they do not require a power robbing hydraulic system ultra high pressure & more stroke per minute . 3.pump

  7. All abrasive jet systems use the same basic two stage nozzle . First , water passes through a small diameter jewel orifice to form a narrow jet . • The abrasive particles are accelerated by the moving stream of water & they pass into a long hollow cylindrical ceramic mixing tube. • Generally two type of nozzle use , right angle head & straight head . 4.nozzle

  8. Fig. Of nozzle

  9. The mixing tube is where the abrasive mixes with the high pressure water . • The mixing tube should be replaced when tolerances drop below acceptable levels . • For maximum accuracy , replace the mixing tube more frequently . 5. Mixing tube

  10. In order to make precision parts , an abrasive jet system must have a precision x-y table and motion control system . • Tables fall into three general categories . • Floor-mounted gantry systems • Integrated table/gantry systems • Floor-mounted cantilever systems 6.Motion system

  11. High pressure water starts at the pump , and is delivered through special high pressure plumbing to the nozzle . • At the nozzle , abrasive is introduced & as the abrasive/water mixture exits , cutting is performed . • Once the jet has exited the nozzle , the energy is dissipated into the catch tank , which is usually full of water & debris from previous cut . working process

  12. fig . schematic diagram of ajm

  13. There are main features of AJM • Obtainable tolerances • Material to machine • Material thickness • Accuracy of table • Stability of table • Control abrasive jet ajm features

  14. Around curves • Inside corner • Feed rate • Acceleration • Nozzle focus • Speed cutting • Pump pressure • Hardness & thickness • Software controlling the motion • Power at the nozzle Machine aspects

  15. Different types of abrasive are used in abrasive jet machining like garnet , aluminum oxide , olivine , silica sand , silicon carbide ,etc . • Virtually any material can be cut by using abrasive jet machining method , i.e harder materials like titanium to steel. • Abrasive particles must be hard ,high toughness, irregular in shape & edges should be sharp . Types of abrasive materials

  16. Extremely fast setup & programming • No start hole required • There is only one tool • Low capital cost • Less vibration • No heat generated in work piece • Environmentally friendly Advantages

  17. Low metal removal rate • Due to stay cutting accuracy is affected • Abrasive powder cannot be reused • Tapper is also a problem Disadvantages

  18. The better performance , and the applications represented above statements confirm that ABRASIVE JET MACHINING is continue to expand . • The new software’s used to minimize time and investments , there by making it possible for more manufacturers of precision parts to install AJM centers . conclusion

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