Ucm tables for unit 1
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Unconventional Machining Processes introduces several machining techniques including ECM, EDM, EBM, LBM, PAM, USM, and AJM. It provides details on the physical parameters, shapes that can be machined, process capabilities, and process economies for each. ECM is best for deep holes, contour machining, and honing. EDM and USM are well suited for shallow holes. USM and EDM can machine precision through cavities. AJM and EDM are used for grinding. PAM is well suited for clean, rapid cuts and profiles. EBM can produce small holes and LBM is best for micro holes. The document compares the techniques and provides technical specifications
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Ucm tables for unit 1
- 1. Unconventional Machining Processes UNIT – 1 INTRODUCTION Table 1.1: Physical Parameters Parameters ECM EDM EBM LBM PAM USM AJM Potential, V 5 – 30 50 – 500 200 x 103 4.5 x 10 3 250 220 220 Current, A 40,000 15 – 500 0.001 2 600 12 1.0 Power, KW 100 2.70 0.15 20 220 2.4 0.22 Gap, mm 0.5 0.05 100 150 7.5 0.25 0.75 Medium Electrolyte Dielectric Fluid Vacuum Air Argn or hydrogen or nitrogen Abrasive grains & water N2 or CO2 or Air Work Material Difficult to machine materials Tungsten Carbides and electrically conductive materials All materials All materials All materials which conduct electricity Tungsten Carbide, Glass, Quartz Hard and brittle materials Table 1.2: Shapes to be machined The application of the unconventional machining processes is also influenced by the shape and size of the work piece to be produced For producing micro holes LBM is best suited For producing small holes EBM is well suited For deep holes (L/D>20) and contour machining ECM is best suited For shallow holes USM and EDM are well suited For precision through cavities in work pieces USM and EDM are best suited For honing ECM is well suited For etching small portions ECM and EDM are well suited For grinding AJM and EDM are best suited For deburring USM and AJM are well suited For threading EDM is best suited For clean, rapid cuts and profiles PAM is well suited For shallow pocketing AJM is well suited
- 2. Unconventional Machining Processes Table 1.3: Process Capability / Machining Characteristics Process Process Capability Material Removal Rate (mm3 /s) MRR Surface Finish (µm, CLA) Accuracy Specific Power (KW/cm3 /min) LBM 0.10 0.4 to 6.0 25 2700 EBM 0.15 to 40 0.4 to 6.0 25 450 EDM 15 to 80 0.25 10 1.8 ECM 27 0.2 to 0.8 50 7.5 PAM 2500 Rough 250 0.90 USM 14 0.2 to 0.7 7.5 9.0 AJM 0.014 0.5 to 1.2 50 312.5 Table 1.4: Process Economy Process Capital Cost Tooling and Fixtures Power requirement Efficiency Total Consumption EDM Medium High Low High High CHM Medium Low High Medium Very low ECM Very High Medium Medium Low Very Low AJM Very Low Low Low High Low USM High High Low High Medium EBM High Low Low Very High Very Low LBM Medium Low Very Low Very High Very Low PAM Very Low Low Very Low Very Low Very Low Conventional Machining Very low Low Low Very Low Low