Manufacturing Technology Today

P. Chandramohan ¹, S. S. Mohamed Nazirudeen ², Srivatsavan ¹

Affiliations
1 Sri Krishna College of Engineering and Technology, Coimbatore- 641004, IN
2 PSG College of Technology, Coimbatore-641004, IN

Abstract

Duplex stainless steels were developed in the early thirties in Sweden and in France. The first duplex steels had about 65% of ferrite in the solution annealed condition and the high ferrite content resulted in rather bad mechanical properties in the Heat affected Zone after welding. Secondary phases play an important role in determining the properties of duplex stainless steel. In this paper, a brief discussion is made about the formation and effect of various phases like sigma (σ), cubic (χ), R-, α¹  G-, τ and laves phase along with the acceptance criteria for secondary phases.

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P. Chandramohan ¹, S. John Alexis ², R. Srivatsavan ³

Affiliations
1 Dept. of Mechatronics Engg., Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641008, IN
2 Dept. of Mechanical Engg., Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641008, IN
3 Mechanical Sciences, Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641008, IN

Abstract

This paper discusses the various fabrication techniques and their automation being used in composite material fabrication. Research and development efforts have made some of the structures amenable to computer aided design and numerical control fabrication. About 70% of total cost of Boron and graphite preliminary composites is spent on fabricating into end shapes. Automation could reduce this cost by 50%. Automated processing of tapes has been widely investigated to reduce lay-up costs. One such approach is using automated facilities at the material supplier's plant to handle alternative materials, thus reducing handling in the processor's facility. These concepts include wide tapes [up to 1.2m], uniweave fabric, and fabrics of conventional construction which are unrolled, automatically cut into full or partial plies, sorted into kits, and then laid up onto a tool.
The next step in composite material fabrication is the paperless factory, where automation is being developed and applied in handling, storage and retrieval of frozen materials through automated cutting, kitting and lay up. Assembled parts would be carried automatically to autoclaves for cutting on an overhead monorail or other conveyor.

Keywords

SMC, PMC, LCM, Prepreg, Autoclave.

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P. Chandramohan ¹, S. John Alexis ², R. Srivatsavan ³

Affiliations
1 Dept of Production Engg, Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641 008, IN
2 Dept of Mechanical Engg, Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641 008, IN
3 Mechanical Sciences, Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641 008, IN

Abstract

The increased use of the sheet metal in industries, because of its increased strength to weight ratio demands quick and efficient manufacturing methods. Conventional sheet metal forming processes result in the increase of tool and die making and material cost This has made the researchers to think in a different direction, which ended up in sheet metal forming by using flexible media. In this paper, a detailed study has been done on the analysis of sheet metal forming using liquid media alone. The results of the analysis are given by means of graphs.

Keywords

Liquid Media, Stretching, Punch, Die, Pressure.

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