Research Article Investigation on Effect of Material Hardness in High Speed CNC End Milling Process N. V. Dhandapani, 1 V. S. Thangarasu, 2 and G. Sureshkannan 3 1 Faculty of Mechanical Engineering, Karpagam College of Engineering, Coimbatore 641032, India 2 Faculty of Mechanical Engineering, Nehru Institute of Engineering and Technology, Coimbatore 641105, India 3 Faculty of Mechanical Engineering, Coimbatore Institute of Technology, Coimbatore 641014, India Correspondence should be addressed to V. S. Tangarasu; vstme05@yahoo.co.in Received 29 May 2015; Revised 20 October 2015; Accepted 18 November 2015 Academic Editor: Claude Amra Copyright © 2015 N. V. Dhandapani et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Tis research paper analyzes the efects of material properties on surface roughness, material removal rate, and tool wear on high speed CNC end milling process with various ferrous and nonferrous materials. Te challenge of material specifc decision on the process parameters of spindle speed, feed rate, depth of cut, coolant fow rate, cutting tool material, and type of coating for the cutting tool for required quality and quantity of production is addressed. Generally, decision made by the operator on foor is based on suggested values of the tool manufacturer or by trial and error method. Tis paper describes efect of various parameters on the surface roughness characteristics of the precision machining part. Te prediction method suggested is based on various experimental analysis of parameters in diferent compositions of input conditions which would beneft the industry on standardization of high speed CNC end milling processes. Te results show a basis for selection of parameters to get better results of surface roughness values as predicted by the case study results. 1. Introduction High speed machining is being considered as one of the fast developing applications in machining of high precision surfaces of components. Te past decade is known for development of importance for CNC machines, and CNCs started replacing many special machines. Recent studies show that fnish machining of precision industrial components needs to be manufactured with high standards of accu- racy and tolerance design for high precision applications. Eventually by the introduction of high speed machining, the requirement for fnish machining becomes meager by the capability of modern CNC machines that are producing parts with very low surface roughness and high levels of geometric accuracies. Tis research is based on extensive case studies conducted for small and medium size precision products manufacturing companies around Coimbatore. Te experiments were conducted on a standard 4-axis high speed milling machine, and the results were compared for the desired parameters to responses also and we analyzed the efects of diferent parametric selection criteria to minimize the human intervention in parameter selection. 2. Related Research Te recent research in this area by Aggarwal and Singh [1] developed mechanistic model similar to dynamic model by Quiza Sardi˜ nas et al. [2], and statistical artifcial intelligence models and also two-phased optimization method by Tzeng and Chen [3] are some examples of cutting force mod- eling and optimization approach using parameter design. Zolfaghariy and Liang [4] addressed dynamic analysis of chip formation, cutting temperatures, tool stresses, and cutting forces. Many researches inferred that the efect of cutting forces developed in milling process can be directly used to estimate process performances of tool wear, cutting time, surface fnish, and so forth. Studies conducted by Kadirgama and Noor [5] showed that peak cutting force component in the feed direction is more sensitive to the tool wear indicator Hindawi Publishing Corporation e Scientific World Journal Volume 2015, Article ID 762604, 6 pages http://dx.doi.org/10.1155/2015/762604