Cryo-Treated Blanking Punch Life Improvement Analysis

Cryogenic treatment is a secondary process to traditional heat treatment used for improving the hardness and wear resistance of tool steels. Though the potential use of cryogenic treatment on AISI D2 tool steel under laboratory conditions has been well established by the researchers, it is essential to do the analysis to ensure its sustainable use for industrial application. Therefore, impact of cryogenic treatment on AISI D2 steel blanking punch was evaluated in terms of increase in production rate and its life. The cryogenically treated D2 tool steel punches were used and subjected to manufacture the control levers using blanking operations.  The improved wear resistance of cryogenically treated punch resulted in increase in production and punch life more than 200%. Punch life was studied and correlated to increase in production & wear behavior of blanking punch. The AISI D2 steel samples were prepared and subjected to laboratory tests comprising of metallographic observations and hardness. It was found that laboratory tests were not enough to predict improvements in mechanical properties. The mechanism responsible for augmented wear resistance by cryogenic treatment was the conversion of retained austenite to martensite and precipitation of new secondary carbides

Experimental Investigation and Regerssion Modelling of Surface Roughness of Copper During Cnc Turning

In today's competitive and dynamic market environment, the main confront of metal-based industry is to maintain higher productivity and the surface excellence of the machined parts. In utmost situation, performance of turning process is measured in terms of quality of surface generated. Fatigue strength, corrosion resistance and creep life increases as superiority of turned surface improves significantly. Therefore ideal surface finish is usually required and appropriate parameters need to be selected to achieve required quality of surface. The present research intends to apply use of Taguchi method to carry out performance analysis of the CNC turned parts to achieve high surface finish on copper alloy material. This paper explores the corollary of process parameters in turning of copper alloy on HAAS CNC lathe machine. In this research work, Taguchis L9 orthogonal array is used to carry out CNC turning operation on copper alloy. To study the performance characteristics in CNC turning signal to noise ratio is evaluated. The output response like surface roughness is analyzed considering effects of factors like spindle speed, tool feed rate and uncut depth of work piece or depth of cut for tool. For predicting the surface roughness, regression mathematical model (in terms of linear and quadratic terms) has also developed from the experimental result, which will be useful to envisage surface roughness value on different combination of selected parameters. From verification experiments it is observed that, calculated surface roughness from model equation varies in the range of 0 to 10% with respect to an experimental value. Thus, it is possible to obtain effective machine utilization and present work will be quite useful for manufacturing engineers working in the field of CNC Machining