Fine Piercing with Rubber for Counter Force in a Double Action Hydraulic Press

• Published in: Transactions of the Indian Institute of Metals 2015-09, Vol.68 (Suppl 2), p.235-242
• Main Authors: Aravind, U., Gopalakrishnan, C. K., Chakkingal, Uday, Venugopal, P.
• Format: Article
• Language: English
• Subjects: Chemistry and Materials Science; Corrosion and Coatings; Materials Science; Metallic Materials; Technical Paper; Tribology
• ISSN: 0972-2815; 0975-1645
• DOI: 10.1007/s12666-015-0577-x

The present work addresses to evolving a sub-press equipment using rubber for counter force by which only two actions would be required to ensure fine piercing of 03 mm thickness, 25 mm diameter (shear area of 235 mm 2 ) (a) Al, (b) EDD steel, (c) alpha brass and (d) 304 stainless steel sheet as opposed to five actions demanded with rigid tools (conventional-fine cutting). The errors with optimal conditions of impingement and rubber counter forces were compared with those reported in literature with rigid tools. The results obtained from the present work were quite promising. Errors were close to those achievable with rigid tools. For smooth shear of 95 % and above, the individual forces were registered and evaluated for a shear area of 235 mm 2 , so that, with this normalization, evaluation of individual forces for other material, thickness and perimeter could be enabled. Analogue parameters of the individual forces using that of commercially pure Al as the basis were then evaluated. These were evolved and furnished for both the ultimate tensile strength (R m ) as well as strength coefficient K of the flow equation of the form σ F  = K × ε n . Such analogue parameters for R m and K were compared and found to have a correlation factor of 0.93–0.99 reflecting the reliability of the present work. The techno-economics has thus been shown.