Manufacturing Technology Today

A. Kadirvel ¹, P. Hariharan ²

Affiliations
1 RMK Engg College, Kavaraipettai, Thiruvallur (Dist), Tamil Nadu, IN
2 Dept of Manufacturing Engg, CEG, Chennai, IN

Abstract

The demand for micro-products and components has been rapidly increasing in electronics, optics, medicine, biotechnology, automotive, communications and avionics industries. Introduction of micro electronics and related technologies brought quantum change in products and applications. The miniaturized products demand innovative manufacturing methods. Micro-EDM is one of the most powerful technologies which are capable of fabricating micro-structure. In this work, EN-24 die steel as workpiece, Cu and CuW as electrodes of 250 μm diameter are used to drill blind holes of 500 μm depth. The comparative analysis of circularity of holes machined by micro-EDM and Heat affected zone are presented.

Keywords

Micro-EDM, MRR, Circularity, HAZ.

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T. Paul ¹, I. Rajakumar ¹, P. Hariharan ¹, Anil Kumar ²

Affiliations
1 College of Engineering, Anna University, Chennai, IN
2 Ceramic Matrix Composites Division, ASL, DRDO, Hyderabad, IN

Abstract

In this paper, an attempt has been made to predict and minimize the delamination in drilling of Carbon Nano Tube (CNT) reinforced epoxy carbon fiber composite laminates with Solid Carbide tool. The experiments were conducted using L9 orthogonal array with feed and cutting speed as process parameters. From the analysis of variance, the optimal combination level and the significant parameters on delamination factor are obtained. The optimization results showed that the combination of low feed rate with high cutting speed is necessary to minimize delamination in drilling of CNT reinforced epoxy carbon fiber composite laminates. The second order models for predicting delamination factor both at entry and exit of the holes have been developed using response surface methodology.

Keywords

Taguchi Method, CNT Reinforced Epoxy Carbon Fiber Composite, Delamination, Response Surface Method.

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P. Hariharan ¹, R. P. Chandrasekar ¹, A. Suresh Babu ¹, A. Rajadurai ², D. Mohanlal ³, S. Renganarayanan ³

Affiliations
1 Department of Manufacturing Engg., Anna University, Chennai-25, IN
2 Department of Production Technoiogy, MIT Campus, Anna University, Chennai-44, IN
3 Department of Mechanical Engineering, Anna University, Chennai-25, IN

Abstract

Bearing components should have high hardness accompanied by good wear resistance and load bearing strength. The most commonly used material for the manufacture of bearing components is steel. To achieve high hardness accompanied by good wear resistance, cryogenic treatment is considered as a supplementary process to conventional heat treatment. Increasing the wear resistance and the impact strength of the bearing components plays an important role in improving manufacturing standards. Since simultaneous enhancement of both these opposing properties is difficult in the heat treatment processes, a method of optimizing these properties together can increase the life o f the bearing components. The factors identified as affecting impact strength and wear resistance are the austenitising temperature, the austenitising time, the tempering temperature, the tempering time, the cryogenic treatment, the quenching media and the type of tempering. In this paper, an attempt is made to find out the optimum combination of heat treatment factors to optimize wear resistance and impact strength of the SAE 51100 bearing steel by using Taguchi’s techniques.

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