Advanced Machining Processes by V.K Jain

By V.K Jain

Non traditional production approaches, Non conventional production tactics

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I. The surface damage during AJM is negligible. ii. AJM is not a good process for cleaning metallic mould cavities. iii. Glass is machined by AJM process using SiC abrasive. The minimum jet velocity required has been found to be 150 ml s. iv. AJM process can be employed to machine materials irrespective of whether they are insulator or conductor of electricity. v. AJM and sand blasting are similar kind of processes from application point of view. vi. Carrier gas used in AJM is either air or 0 2.

Efficient cutting is obtained at resonance frequency. Tool and tool holder com bi­ nation having higher resonance frequency will yield higher MRR, provided machining is done at the resonance frequency. MRR, goes down as the depth ol the hole increases. It happens so because of inefficient flow of slurry through the cutting zone at high depth. PROCESS CAPABILITIES USM works satisfactorily only when workpiece hardness is greater than HRC 40 (hardness on Rockwell scale ‘C ’). It works very well if workpiece hardness is 42 greater than HRC 60.

In some cases, they are hammered also through the slurry. Fig. 2 shows a schematic diagram of USM system. Fig. 1 The word ultrasonic describes a vibratory wave having frequency larger than upper frequency limit of human ear (usually greater than 16 kc/s). Waves are usually classified as shear waves and longitudinal waves. High velocity longitu­ dinal waves can easily propagate in solids, liquids and gases. They are normally used in ultrasonic applications. 29 Leads to energize \ transducer * winding Magnetostriction transducer Concentrator Fig.

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