Optimization of Process Parameters in Drilling of Mild Steel for Exit Burr Mr. Dhanke V. D. (1) , Prof. Phafat N.G. (2) , Prof. Gangane V.S. (3) 1,2 Student, M.E. Manufacturing, 2 Assistant Professor Mechanical Engineering Department, J.N.E.C. Aurangabad, Maharashtra, India Abstract This paper presents the statistical analysis of process parameters for burr height in drilling of Mild steel. In the present investigation work, the influence of process parameters like speed, feed and depth of cut in dry drilling, are studied as burr height as the output response variable. The experimental work was completed on Radial Drilling Machine under varying speed, feed and depth of cut. Taguchi orthogonal array method was used for design of experiment. Using L9 orthogonal array nine readings were taken for measurement of exit burr. The experimental results were analyzed statistically to study the influence of process parameters on burr height. Keywords Drilling, burr height, orthogonal array, SN ratio. Introduction Drilling is one of the important manufacturing operations that can be carried out on number of parts for assembly work. Drilling operation is essential for manufacturing industries like automobile industry, aerospace industry, medical and electrical related industries etc. Formation of exit burr after drilling operation is one of the important problems that have to be minimized or control in order to avoid its adverse effect during manufacturing stage or assembly work. Burr is defined as the projection of material at the end of the hole due to plastic deformation of the material. Burr has two types’ viz. entrance burr and exit burr. The exit burr is important because these are larger in size than entrance burr. Exit burr creates several problems like decreasing quality of the products, improper seating between mating parts during assembly, jamming and misalignment of parts etc. Burrs are injurious to workers during machining operations.[2,3] Especially in precision industries, burrs are quiet undesirable. Due to all these problems deburring operation should be carried out on the work piece to remove the burr formed during drilling operation. This will result in waste of time and money. Almost 30% of the total manufacturing cost [3] will be spending on deburring and edge finishing of components. Therefore a special attention should be given to minimize or control the exit drilling burr. To minimize the burr formation, it is necessary to understand the burr formation mechanism and factors affecting the burr size during machining. This will be done by preparing the accurate mathematical model that describe the relation of the burr size with the process parameters and gives the correct value of burr height. This paper only concentrates on the analysis of experimental readings for finding the best possible input parameters within the given range. Burr formation Mechanism FIG. 1 EXIT BURR FORMATION Figure 1 describes the formation of an exit burr in drilling.[6] As the drill approaches the exit, the work piece deflects and then plastically deforms due to the thrust force created by the drill (frame 2). Once this deformation is initiated, it increases as the drill (frame 3) cuts more of the work piece material. When the drill exits the work piece, the remaining material deflects creating an exit burr (frame 4). The material mild steel has lot of applications in manufacturing industries such as nails, screws, nuts, bolts, car bodies, sheep plates, boiler plates, fan blades etc. 375 International Journal of Engineering Research & Technology (IJERT) ISSN: 2278-0181 www.ijert.org IJERTV2IS90184 Vol. 2 Issue 9, September - 2013