By V.K Jain
Non traditional production strategies, Non conventional production tactics
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Extra resources for Advanced Machining Processes
REVIEW QUESTIONS 1. 2. 3. 4. 5. 6. 7. Draw a schematic diagram of AJM system and label it. Explain the working principle o f AJM process. With the help of sketches, show the effect of stand-off-distance on (a) width of cut, (b) material removal rate. “ AJM is not recommended to machine ductile materials” . Comment. Show the effect of carrier gas pressure on MRR during AJM. W rite five important variables of AJM process. Draw a sketch showing the effect of one of these variables on MRR. Write the applications of different types of abrasives used in AJM.
5 (a ) r Tool Top position Mean position When tool touches grain 1 Bottom position Abrasive grain rTTr, -rrr o --------- X? Time required = T /4 ; Time required = AT Work Fig. 5 (b) Fig. 5 (a) Assumed mode of tool vibration. (b) Various positions of tool while hitting workpiece via a grit. 41 PARAMETRIC ANALYSIS Performance (MRR, accuracy and surface finish) of the USM process depends upon the following parameters: Abrasives : size, shape, and concentration. Tool and tool h o ld er: material, frequency of vibration, and amplitude of vibration.
6 Effect of nozzle pressure on material removal rate [Venna and Lai, 1984]. significant effect o f change in mesh size (or abrasive grain diameter) and abrasive grain velocity. Eq. 4 also indicates that harder the work material, smaller will be MRRVfor the same machining conditions. PROCESS CAPABILITIES Although AJM gives low MRRV (approx. 015 cm 3 /min) but it can easily produce intricate details in hard and brittle materials. 2 mm) on machined edge are some of the characteristics of the AJM process.