CFD ASSISTED NOZZLE DESIGN IN BURR REMOVAL PROCESS

The paper deals with comparative study of different types of nozzles and selection of best suitable nozzle was done; which can be used for metal chip blowing purpose during machining in CNC machine. Three different type of nozzles, one Convergent type, one Bent Convergent& one Convergent-divergent (C-D) type, were designed and modeled in CATIA V5 software. These nozzles were designed at par with the various commercially available blow off nozzles. Further, Computational Fluid Dynamics (CFD) analysis of these nozzles were carried out for estimating the various internal flow properties like variation of density, temperature, pressure, velocity, mass flow rate and Mach number. The chocking phenomenon in nozzles is also studied in this paper. After analysis, it has been concluded that the modeled Convergent Nozzle is best for blowing metal chips during machining in CNC machine. However, the modeled Bent Convergent and C-D nozzles would not be effective for the blow off purpose, this could be due to the choking and reverse flow at the exit. Further, this convergent nozzle is manufactured, validated and found satisfactory.