Experimental investigation of hot machining of EN-19 Steel

Abstract

In this dissertation work experimental investigation was carried out to optimize the MRR,SR,TWR & RU with using hot machining process. The experiment was carried out on EN- 19 steel with using carbide coated and carbide uncoated insert on the CNC turning machine. For machining EN-19 Steel hot machining introduced because by conventional machining microdamage’s (microcracks) produced on EN-19 surface. The L18 orthogonal array was used for experimentation. The DOE is done using Taguchi Method. The muffle furnace (electric resistance heating) is used for the heating the EN-19 steel. The parameters are varied to get effect of each parameter on the response variable which is taken by random experimental runs of L18 orthogonal array. Then after experimentation single optimization for each responce parameter was done by using Taguchi method , Main plot effect graph are plotted to find out effect of each input parameter on particular output, multi-objective optimization done using gray relational analysis & anova is done to find out contribution of each parameter on each response. From all analysis it was founded that Most influencing factor on surface roughness & tool wear rate is temperature of workpiece..From the ANOVA results surface roughness have 86.8% & 80.67% contribution of temperature of workpiece for DOE (first) & random experimental combination respectively.Similarly,from the ANOVA results tool wear rate have 41.24% & 48.18% contribution of temperature of workpiece for DOE (first) & random experimental combination respectively.optimized combination for DOE (first) experimental combination are spindle speed 300RPM,feed 0.2mm/min,depth of cut 1 mm,temperature 450 degree Celsius & tool material is carbide coated insert.Similarly for random experimental combination ,Optimized input parameters are spindle speed 350RPM,feed 0.2mm/min,depth of cut is 1 mm,temperature 400 degree Celsius & tool material is carbide coated insert.