International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 07 | July-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 797 EXPERIMENTAL INVESTIGATION AND ANALYSIS OF CONCENTRIC SPRING FOR PREVENTING DIE SET COMPONENT FAILURE Nikita Sashte 1 , Ganesh Kondhalkar 2 1 PG scholar, Mechanical Department, APCOER, Savitribai Phule Pune University, Pune 2 Assistant Professor, Mechanical Department, APCOER, Savitribai Phule Pune University, Pune ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - This paper discuss about the basic fundamentals and working principle of the die set mechanisms and the problems and remedies occurring during functioning of the system. The main cause of failure of the system is due to the failure of the spring mechanism which is set to achieve restoring of the lower die after each stroke by punch. A typical die and punch set used for blanking operation is highly dependent upon the spring system utilized in it. The helical compression spring is used for the easy restoration of the system during functioning. To prevent this failure and to avoid the bottlenecks a strong restoring mechanism is required which will sustain under these varying loading conditions. The concentric springs carries the greater loads and mostly implemented over the varying load conditions. Those spring increases the performance of the die set mechanisms. FEA of the new developed spring is performed to ensure the proper working and deformation of the spring which provides the best suitable results. Key Words: Die set component, concentric spring, FEA 1.INTRODUCTION Punch holder is fixed to the ram of the press and punch is fastened to the punch holder which is aligned with the opening in the die block. It uses guide pins to take the punch out of the hole. Die shoe clipped to the bolster plate. [A] Die holder used for holding the die to sustain it against heavy loads applied from the ram [B] Die main component of the set which is used for forming the material [C] Guide Post Guide post guides the punch holder for its appropriate and correct movement [D] Punch holder holds the punch rigidly and provides support while punching [E] Punch used to exert the force / pressure on work piece [F] Bed provides foundations to all the sub-assemblies and those are mounted on the bed which is rigid to sustain heavy loads and prevent vibrations. [G] Springs restores the lower die at predetermine place to obtain the accuracy of the parts Fig -1: Die Set Components Wide-ranging design and uninterrupted upgrading creates conformance to the desires of the customers and the methodology which will substantially reduce the loss occurring in the company arises due to rejection or damages. Quality of design is a critical process, typically hinged on a number of factors which can be either cost or performance related. Fig -2 : Applications of Concentric Spring Design of Concentric spring for preventing the failure of the die set component to reduce the breakdown time as well as to reduce the downtime of production line is the essential task and difficult to tackle. Also material selection for