Why high carbon high chromium steel machine with electric discharge machining?
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International Journal of Trend in Scientific Research and Development (IJTSRD) International Open Access Journal ♦. ISSN No: 2456 - 6470 | www.ijtsrd.com | Volume - 2 | Issue - 4 ♦ ♦ Study of Machining on High Carbon High Chromium Die Steel Using Wire Cut EDM under Various Conditions G. Nallaiya 1 , K. S. Sekar 2 Department of Tool and Die Making, Department of Mechanical Engineering 1,2 Murugappa Polytechnic College, Chennai, India ABSTRACT Tool steel are high quality steels made to close compositional and physical tolerances, they are used to make tools for cuttings, forming or shaping material into a part or component adapted to define use. There are various types tool steels are available in this we decided to select D2 material (i.e.) high carbon High chromium die steel. Using wire cut EDM machine we did machining on D2 steel under various condition - ordinary conditions, After Hardening Conditions and after Hardening and tempering Conditions The process parameters viz. Wire diameter, Wire feed rate and Current will be kept constant the wire consumption and machining time measured. Keywords: Carbon, Chromium Wire, WEDM and Tool Chapter-1 1.0. INTRODUCTION 1.1. Selection of High Carbon High Chromium Die Steel There are various type of tool steels are available in which we have selected D2 “high carbon high chromium cold work steel” All group “D” tool steels except type “D3” are air hardening, and attain full hardness when cooled in still air. Group “D” steels have high resistance to softening at elevated temperatures. These steel also exits excellent resistances to wear. Especially type D7, which has the highest carbon and vanadium contents. All group D steels particularly the higher carbon types D3,D4 AND D7 - Contain massive carbides that make them susceptible to edge brittleness. Typically application for group D steels includes long run dies for blanking, forming, threading rolling, and deep drawing, dies for cutting laminations, brick moulds, gages, burnishing tools, rolls, and shear and slitter knives. 1.2. Heat-Treating the Specimen Heat treatment was done on the specimens as per the instructions and details from the heat treater’s guide. The Heat treatment cycle diagram is shown below. Figure 1: Thermal Cycle Diagram
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