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Vinod, A. R.
- Studies on Micro-Electrical Discharge Machining of Steel Using Copper Electrodes
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Authors
Affiliations
1 Central Manufacturing Technology Institute, Tumkur Road, Bangalore, IN
1 Central Manufacturing Technology Institute, Tumkur Road, Bangalore, IN
Source
Manufacturing Technology Today, Vol 14, No 1 (2015), Pagination: 9-13Abstract
Electrical Discharge Machining (EDM) is one of the non-conventional machining processes used for machining of electrically conductive materials. Mechanism of material removal in EDM is based on conversion of electrical energy into thermal energy. In this paper, copper electrodes of diameter 0.1, 0.4 and 0.8 mm were used for machining holes on steel work-piece to a depth of 0.2 mm by micro-EDM process. Experiments were conducted at a capacitance of 0.001, 0.01, 0.1 and 0.4 μF with a gap voltage of 80 V and the electrode was rotated at 100 rpm during ED machining. Wear on the electrode; surface roughness and the size of the machined hole were measured. Capacitance had a profound influence on the material removal rate, volumetric wear ratio, spark gap and surface roughness of work-piece.Keywords
EDM, Micro-Holes, Electrodes, Wear, Capacitance, Spark Gap.
- Deposition of Bronze-Nickel on Steel by Laser-Based Metal Deposition Process
Abstract Views :175 |
PDF Views:2
Authors
Affiliations
1 Central Manufacturing Technology Institute, Tumkur Road, Bangalore, IN
1 Central Manufacturing Technology Institute, Tumkur Road, Bangalore, IN
Source
Manufacturing Technology Today, Vol 13, No 1 (2014), Pagination: 27-30Abstract
Direct Metal Deposition (DMD) is an additive manufacturing process for fabrication of metal parts directly from CAD model using high power lasers as heat source. In this paper, bronze nickel material was deposited on steel substrate by DMD process. Laser power was varied from 100 to 300 W in steps of 50. Laser scan speed, powder flow rate, nozzle stand-off and step-over were maintained at 165 mm/min, 1.2 g/min, 10 mm and 0.15 mm respectively. Laser power had a significant influence on the quality of joint between bronze nickel and steel.Keywords
Additive Manufacturing, DMD, Laser, Dissimilar Materials.- Microstructure Evaluation of Direct Metal Laser Sintered SS316L - MWCNT Composite
Abstract Views :179 |
PDF Views:4
Authors
Affiliations
1 Mech. Engg. Dept., NITK, Surathkal, Mangaluru, IN
2 Central Manufacturing Technology Institute, Bengaluru, IN
1 Mech. Engg. Dept., NITK, Surathkal, Mangaluru, IN
2 Central Manufacturing Technology Institute, Bengaluru, IN
Source
Manufacturing Technology Today, Vol 16, No 8 (2017), Pagination: 3-9Abstract
Metal matrix composite comprising of Stainless Steel SS316L reinforced with Multi-walled carbon nanotubes has been developed by laser assisted process. Pure electroless Ni coating was done to enhance wettability of CNTs. Double cone blender was used to obtain homogeneous mixture of electroless Ni coated MWCNTs in different vol. % and SS316L powder. Test specimens were fabricated at various laser scan speeds. Morphology and Microstructure studies were conducted by using Optical Microscopy, X-ray diffraction, FESEM, and EDS. Electroless Ni coating was evaluated for surface morphology and elemental composition. The effect of laser scan speed and CNT vol.% content on solidification and microstructure changes has been investigated. SEM microstructures of tensile fractured surface of composite have been studied for wetting behaviour and survival of CNTs under high temperature processing. Ni coated MWCNT could be a promising reinforcing nano material for developing high strength and low weight MMCs.Keywords
Metal Matrix Composite, MWCNTs, Direct Metal Laser Sintering, Electroless Coating.References
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- Challenges and Research Opportunities in Metal Additive Manufacturing
Abstract Views :202 |
PDF Views:0
Authors
Affiliations
1 Central Manufacturing Technology Institute(CMTI), Tumkur road, Bengaluru, IN
1 Central Manufacturing Technology Institute(CMTI), Tumkur road, Bengaluru, IN
Source
Manufacturing Technology Today, Vol 18, No SP 3 (2019), Pagination: 54-57Abstract
Additive manufacturing has changed the way products are designed, manufactured and distributed to the consumers. It has made possible to create products previously thought too complex. Aerospace, medical, automotive and energy sectors started using additive manufacturing as they realised its potential innovation, financial and efficiency benefits. Despite the progress, there are still challenges that must be addressed, including improving the throughput, Accuracy and repeatability, surface roughness, mechanical properties, establishing standards and protocols, modelling and simulation to reduce the residual stress, certification and reducing the raw material cost. This article gives insights into the present barriers hindering the widespread adoption and research opportunities in metal additive manufacturing.References
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- Gustavo Tapia,Alaa Elwany, 2014 “A Review on Process Monitoring and Control in Metal-Based Additive Manufacturing” Journal of Manufacturing Science and Engineering, vol. 136, no. 6.
- Jason M. Weaver, T.J. Barton, John Linn, Derrik Jenkins and Michael P. Miles, 2018 “Quantifying accuracy of a concept laser metal additive machine through the NIST test artefact” Rapid Prototyping Journal.
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