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Kibria, G.
- Optimization of Surface Roughness during Nd:YAG Laser Micro-Turning Process of Alumina
Abstract Views :320 |
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Authors
Affiliations
1 Mechanical Engineering Department, Aliah University, Kolkata-700091, IN
2 Production Engineering Department, Jadavpur University, Kolkata-700032, IN
1 Mechanical Engineering Department, Aliah University, Kolkata-700091, IN
2 Production Engineering Department, Jadavpur University, Kolkata-700032, IN
Source
Journal of the Association of Engineers, India, Vol 84, No 3-4 (2014), Pagination: 36-48Abstract
Laser micro-turning process is one of the newly developed laser material processing technologies to generate micro-turned groove or surface on cylindrical workpiece. In the present paper, an attempt has been made to investigate the laser micro-turning operation on cylindrical shaped aluminium oxide (Al2O3) ceramic to study the influence of different laser micro-turning process parameters namely, laser average power, pulse frequency, workpiece rotational speed, assist air pressure and Y feed rate using response surface methodology (RSM) experimental plan. The mathematical model for surface roughness (Ra) has been developed and the adequacy of the model has been tested through analysis of variance (ANOVA) results. Average power and pulse frequency are the most significant process parameters. Optimal parametric combination for minimum value of surface roughness has been achieved as 5.23μm at parametric setting of average power of 9.04 W, pulse frequency of 4108.18 Hz, workpiece rotational speed of 451.16 rpm, air pressure of 1.44 kgf/cm2 and Y feed rate of 0.37 mm/s. Confirmation experimental results show a good agreement between RSM based optimal and experimental value of response criterion.Keywords
Laser Micro-Turning, Surface Roughness, Alumina, Response Surface Methodology.- Effect of Boron Carbide (B4C) Additive during Micro-Electrical Discharge Machining of Ti-6Al-4V Alloy
Abstract Views :346 |
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Authors
Affiliations
1 Mechanical Engineering Department, Aliah University, Kolkata-700091, IN
2 Production Engineering Department, Jadavpur University, Kolkata-700032, IN
1 Mechanical Engineering Department, Aliah University, Kolkata-700091, IN
2 Production Engineering Department, Jadavpur University, Kolkata-700032, IN
Source
Journal of the Association of Engineers, India, Vol 83, No 3-4 (2013), Pagination: 25-34Abstract
Micro-electrical discharge machining (μEDM) deals with micro dimensional material removal from the work sample due to the repetitive spark discharge between the micro-tool electrode and the workpiece. In the present paper, an attempt has been made to machine through micro-holes on Ti-6Al-4V superalloy plates to investigate the effect of mixing of Boron Carbide (B4C) powder additive in kerosene dielectric. A detailed comparative study has been made showing the effect on micro-ED machining criteria i.e. material removal rate (MRR), tool wear rate (TWR), overcut (OC) and taper by varying two most influencing micro-EDM process parameters i.e. peak current and pulse-on-time keeping other parameters such as flushing pressure, duty ratio, gap voltage, etc. as constant. It has been found that B4C powder can enhance material removal rate while it can reduce tool wear rate. Analyses have also been done showing some optical and SEM micrographs of the micro-tool electrode tips as well as machined micro-hole walls to study the micro-hole surface features during experimentation.Keywords
Micro-EDM, Ti-6Al-4V, Boron Carbide Additive, MRR, TWR, Overcut, Dielectric.- The Effect of Defocused Machining During Laser Micro-Turning process of Aluminium Oxide (Al2O3) Ceramics
Abstract Views :160 |
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Authors
Affiliations
1 Mechanical Engineering Department, Aliah University, Kolkata, IN
2 Production Engineering Department, Jadavpur University, Kolkata, IN
1 Mechanical Engineering Department, Aliah University, Kolkata, IN
2 Production Engineering Department, Jadavpur University, Kolkata, IN
Source
Manufacturing Technology Today, Vol 14, No 2 (2015), Pagination: 20-27Abstract
The present paper addresses the laser micro-turning process of aluminium oxide (Al2O3) ceramics of size 10 mm in diameter and 40 mm in length. The experiments have been conducted using response surface methodology design of experiments. The targeted depth was set at 100 μm. Laser average power, pulse frequency, workpiece rotating speed, air pressure and Y feed rate were considered as process variables. After each experiment, surface roughness (Ra) and micro-turning depth deviation have been measured. Multi-objective optimization has been done to obtain optimal values of responses i.e. surface roughness and depth deviation. To achieve further high quality machined surface, machining was done at various defocusing conditions of laser beam and also by varying the number of laser scan passes. Other parameters were kept constant at optimal parametric combination obtained in multi-objective optimization. From the experimental results, it was revealed that surface roughness decreases with increase in defocusing positions. With increase in number of passes up to a certain limit, surface roughness decreases. However, depth deviation increases with number of laser scan passes at all levels of defocus planes.Keywords
Pulsed Nd:YAG Laser, Laser Micro-Turning, Surface Roughness, Advanced Ceramics, Aluminium Oxide (Al2O3), Defocusing Positions.- Present Status of Nd:YAG Laser Beam Micromachining of Engineering Ceramics
Abstract Views :166 |
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Authors
Affiliations
1 Prod. Engg. Dept., Jadavpur University, Kolkata, IN
1 Prod. Engg. Dept., Jadavpur University, Kolkata, IN