Comparission between ajm ,usm and edm
- 1. COMPARISSION BETWEEN AJM ,USM AND EDM SHUKLA SHIVAM SATYANARAYAN 184 M. Tech. (Production Engineering) 2015-2016 DEPARTMENT OF MECHANICAL ENGINEERING MSU BARODA
- 7. Mechanism of Material Removal in EDM Process The material removal process by a single spark is as follows: • An intense electric field develops in the gap between electrode and workpiece. • There are some contaminants inside the dielectric fluid which build a high conductivity bridge between the electrode and workpiece. • When the voltage increases, the bridge and dielectric fluid between the electrode and workpiece heat up. • The dielectric is ionized to form a spark channel. • The temperature and pressure rapidly increase and a spark is generated. • A small amount of material is evaporated on the electrode and workpiece at the spark contact point. • Bubbles rapidly expand & explode during sparking until voltage is turned off. • Next the heating channel collapses and the dielectric fluid enters into the gap • in-order to flush away the molten metal particles.
- 19. The application of non traditional machining are influence by the workpiece shape and size to be produced like holes ,through cavities ,pocketing surfacing and special application For comparison the following parameter are considered •Material removal rate •Power consumed •Accuracy •Surface finish
- 22. PROCESS AJM USM EDM Characteristics Suitable for all material •Tapered surface generated •Effect of standoff distance Brittle fracture •Abrasive embedding Shaping and cutting complex parts made of hard materials White layer Expensive tooling and equipment Operating parameters V = 110, I = 1.5 A, Gap = 0.76 V=220,A=12ampAC ,Gap=0.25 V=50-380,A=0.1-500, Gap=0.01-0.50 Form of Energy Abrasive propelled at in high speed air Small amplitude and high frequency Series of sparks
- 23. POCESS AJM USM EDM Variant process Abrasive Flow Machining (AFM) •Orbital Grinding (OG) •Abrasive Water Jet Machining (AWJM) Ultrasonically Assisted Machining (UAM) •Rotary ultrasonically Assisted Machining(RUM) Wire Electrical Discharge Machining (WEDM) Wire Electrical Discharge Grinding (WEDG) MRR 0.0001 cm3/min 0.8 cm3/min 2 to 400 mm3/min MEDIUM Gas like air, nitrogen Abrasive slurry Dielectric fluid Surface roughness 0.3 - 2.3 µm 0.2 – 1.6 µm 0.05 – 12.5 µm