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 693 Multi-response Optimization Of Machining Parameters In End Milling CNC Machine of AISI H13 Hot Die Steel By Using Grey Relational Analysis Yogesh G. Jadhav 1 , Prof. Kushal S. Wasankar 2 1 PG Student, Mechanical Engineering Department, Government College of Engineering, Aurangabad (M.S), India. 2 Assistant Professor, Mechanical Engineering Department, Government College of Engineering, Aurangabad (M.S), India. ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract – In this study a Research is carried out for the optimization of End milling process of AISI H-13 hot die steel material with multiple performance characteristics based on the orthogonal array with taguchi-grey relational analysis method. Surface roughness and material removal rate are optimized by consideration of the performance characteristics like cutting speed, feed rate and depth of cut. A comparative study has been done with coolant condition and compressed air condition by using carbide coated end milling cutter tool. A grey relational grade obtained from the grey relational analysis is used to solve the end milling process with multiple performance characteristics. An analysis of variance (ANOVA) is applied to identify the most significant factor and its percentage influence on output parameter. At last confirmation tests are performed to make comparison between the experimental results and developed model. Key Words: End milling, AISI H-13, carbide coated tool, taguchi design of experiments, grey relational analysis and optimisation. 1. INTRODUCTION Milling is the name given to machining process in which the metal removal takes place due to cutting action of a revolving cutter. Milling is the machining process that uses rotary cutters to remove material from the workpiece by advancing in a direction with some angle along the axis of the tool. The cutter rotates at high speed and because of the multiple cutting edges it removes metal at very fast rate. It covers a wide variety of different operations and machines, on scales from small individual parts to large heavy-duty gang milling operations. It is one of the most commonly used processes in industry and machine shops today for machining parts to precise sizes and shapes. [1] 1.1 End Milling The end milling may be considered as the combination of peripheral and face milling operation. The cutter has teeth both on the end face and on the periphery. [1] End milling is commonly used in most of the manufacturing industries due to its ability of producing complex geometric edges with reasonable accuracy and surface finish. However, with the inventions of CNC milling machine, the flexibility has been adopted along with versatility in end milling process. Cutting parameters as spindle speed, feed, depth of cut, type and flow of cutting fluid affects the surface finish of the product. Thus optimizing the process parameters for the minimum surface roughness is important in CNC end milling process. With the more precise demands of modern engineering products and competition to supply best quality of the products, the surface finish together with dimensional accuracy plays a very vital role. It has been observed that Ǯsurface textureǯ greatly influences the functioning of the machined parts. Whatever may be the manufacturing process that used for manufacturing it is not possible to produce perfectly smooth surface. Hence, the improved qualities of product and the economics of the manufacturing operation are very important consideration to produce product having the functional and visual appeal. The end mill cutting operation is as shown in fig 1.1 Fig -1: End milling operation 2. EXPERIMENATL SET UP A. MATERIAL The material used for this study is H13 hot die steel. It contains strengthening agents such as vanadium and molybdenum. These steels are resistant to softening at elevated temperatures due to the presence of chromium content. Since increased hardness slows down the formation of heat checking cracks, improved tool performance can be expected. The composition of H13 is given in following table