INTERNATIONAL JOURNAL OF ENGINEERING, SCIENCE AND - Volume 6, Issue 3, July 2017

Pages: 25-42

Date of Publication: 01-Jul-2017

Print Article   Download XML  Download PDF

EXPERIMENTALLY INVESTIGATION THE MATERIAL REMOVAL RATE IN POWDER MIXED ELECTRIC DISCHARGE MACHINING PROCESS ON HIGH SPEED STEEL

Author: NAVDEEP AGGARWAL DR.BEANT SINGH

Category: Engineering, Science and Mathematics

Abstract:

Powder Mixed Electric Discharge Machining is capable of machining geometrically complex shapes and hard material components that are difficult to machine such as ceramics, carbides, heat treated tool steels, composites, super alloys, heat resistant steels etc. These hard material components are widely used in tool, die and mold making industries, automotive, aeronautics, nuclear industries and construction industries. For any manufacturing and fabrication process, particularly related to Electric Discharge Machining process the correct selection of machining parameters is one of the most important aspects to be considered.

This experimental work investigates the effect of dielectric fluid on the material removal rate. Further, the machining parameters like pulse on time, current and pulse off time are also investigated to improve the material removal rate. The experiment has been conducted on high speed steel work piece using square shaped copper electrode having cross-section 8mm×8mm. For this experimental work, kerosene oil and copper powder mixed kerosene oil are used as a dielectric medium. The layout of design of experiment is based on Taguchi L9 orthogonal array and the analysis of variance is used to analyze the results and to determine the most significance machining parameter. From the results obtained, it is concluded that copper powder mixed kerosene oil as a dielectric fluid provides more material removal rate as compared to the simple kerosene oil. From the main effect plots, it is found that pulse on time and current are the most influencing parameters for material removal rate and pulse off time has the least effect. As the pulse on time and current increases, the material removal rate also increases (i.e. material removal rate varies directly with pulse on time and current). The optimal values of machining parameters like pulse on time, current and pulse off time are 150 µs, 12 Amp and 10 µs respectively.

Keywords: EXPERIMENTALLY INVESTIGATION THE MATERIAL REMOVAL RATE IN POWDER MIXED ELECTRIC DISCHARGE MACHINING PROCESS ON HIGH SPEED STEEL