129 P.Goyal, G.Srivastava, R.Singh, N.Singh International Journal of Engineering Technology Science and Research IJETSR www.ijetsr.com ISSN 2394 – 3386 Volume 2 Issue 2 February 2015 ABSTRACT:-This project work deals with the design of pneumatically controlled small scale punching machine to carry out piercing operation on thin sheets (1-2 mm) of different material (aluminium and plastic). Reduction in punching force requirement being the main aim of this project work is obtained by modification in punch tool design i.e. by provision of shear on punch face. Subsequently it results in reduction in amount of punching force requirement. And further a CATIA model of the machine is developed on the basis of calculations with respect to punching force requirement. KEYWORDS:-Punching Force, Stripping Force, Punch, Single and double shear, Percentage Penetration, and Pneumatic cylinder. I. INTRODUCTION:-A pneumatic punching machine is always a better choice than a hydraulic punching machine for the production of similar products if it is suited for the method. It is comparatively more economical for production of large quantities of products as it uses compressed air rather than some hydraulic fluid which is rather expensive. A pneumatic punching machine uses compressed air to generate high pressure to be applied on the piston. A solenoid valve controls the directional flow of air into and out of the cylinder. Polyurethane tubes are used for pressure transmission from the pneumatic cylinder to the punch assembly. The high pressure air fed to the punch, forces it on the material and as the punch descends upon the sheet, the pressure exerted by the punch first cause the plastic deformation of the sheet. Since the clearance between the punch and the die is very small, the plastic deformation takes place in a localized area and the sheet material adjacent to the cutting edges of the punch & die edges becomes highly stressed, which causes the fracture to start on both sides of the sheet as the deformation progresses. II. DESCRIPTION OF MACHINE:-The Pneumatic punching machine is developed using various components. The components are pneumatic cylinder, pressure regulator, Solenoid/direction control valve, flow control valve, compressor, mounting table. The cylinder is used for up and down motion of the punch tool which performs the punching operation on the sheet of aluminium/plastic material. The compressor provides compressed air to the cylinder, which causes movement of the piston rod. Pneumatic automation components extensively use sealing material made out of rubber compounds. For efficient and trouble free working of these seals, they need to be oiled or lubricated to reduce friction and corrosion. To lubricate compressed air actuated equipment, the most efficient and economical method is to inject the lubricant in to the compressed air that powers this equipment. Solenoid/Direction control valve is used to control the direction of the air. Review on Pneumatic Punching Machine and Modification in Punch Tool to Reduce Punching Force Requirement P.Goyal, G.Srivastava, R.Singh, N.Singh UG students [Mechanical], Dept. of Mechanical Engineering, JSS Academy of Technical Education, Noida, Uttar Pradesh, India