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Bhattacharyya, B.
- The Effect of Defocused Machining During Laser Micro-Turning process of Aluminium Oxide (Al2O3) Ceramics
Abstract Views :159 |
PDF Views:1
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 Marking Process
Abstract Views :168 |
PDF Views:0
Authors
Affiliations
1 Production Engg. Dept., Jadavpur University, Kolkata, IN
1 Production Engg. Dept., Jadavpur University, Kolkata, IN
Source
Manufacturing Technology Today, Vol 9, No 5 (2010), Pagination: 16-26Abstract
Laser marking is one of the emerging technologies in the field of laser processing. Laser marking is the best and most applied technique to make permanent marks on a wide range of materials. Nd:YAG laser beam can be used for marking on various materials such as ceramics, metals and composites etc. This paper includes the review on research activities in the area of Nd:YAG laser marking process. The present status of Nd:YAG laser marking process will obviously generate further scope of research and development in the field of laser marking.Keywords
Nd:YAG Laser, Laser Marking, Engineering Materials.- Present Status of Nd:YAG Laser Beam Micromachining of Engineering Ceramics
Abstract Views :163 |
PDF Views:0
Authors
Affiliations
1 Prod. Engg. Dept., Jadavpur University, Kolkata, IN
1 Prod. Engg. Dept., Jadavpur University, Kolkata, IN
Source
Manufacturing Technology Today, Vol 8, No 7 (2009), Pagination: 3-12Abstract
Laser beam machining (LBM) is a non-contact type of material removal process and this advanced thermal machining process is extensively used worldwide in material processing field in modern industries. The high density focused laser beam melts and vaporizes the unnecessary portion of parent material very efficiently. During the last decades, a number of researchers have explored experimentally and theoretically this Nd:YAG laser beam machining technique with different materials like metals, alloys, ceramics and composites through a number of ways to improve the machining performances. The paper reviews the research works performed in the area of Nd:YAG laser micromachining operations such as micro-drilling, microgrooving, micro-cutting, micro-milling, micro-turning and marking etc. on aduanced engineering ceramics for searching out the various micro-machining process parameters and their effects on laser machining performance characteristics.- Travelling Wire Electrochemical Discharge Machining System Development for Precision Machining of Non-Conducting Materials
Abstract Views :176 |
PDF Views:0
Authors
Affiliations
1 Production Engg. Dept., Jadavpur University, Kolkata-700032, IN
1 Production Engg. Dept., Jadavpur University, Kolkata-700032, IN
Source
Manufacturing Technology Today, Vol 6, No 4 (2007), Pagination: 18-22Abstract
Traveling Wire Electrochemical Discharge Machining (TW-ECDM) System has great potential to cut non-conducting engineering hard materials such as ceramics and composites etc. There is also an urgent need for precision machining of engineering ceramics and composites with the development of these materials. Several non-conventional machining processes are available but all of them have inherent difficulties. The traditional method of slicing glass and ceramics, quartz etc. is limited mainly due to high cutting force and requirement of utra-hard tool materials. Hence there is a need to develop an efficient method of cutting and slicing non-conducting engineering materials. Traveling Wire Electrochemical Discharge Machining (TW-ECDM) is an important useful process for this purpose. Present research paper includes the design and development of the experimental setup of total TW-ECDM system which consists of main machining chamber, mechanical hardware modules, electrolyte flow control units and electrical pulsed dc power supply unit. The operation of the developed TWECDM System has been tested after carrying out some experimentation on cutting of Silicon Nitride.- Analysis on the Machining of Silicon Nitride Ceramic Materials through Electrochemical Discharge Machining Process
Abstract Views :188 |
PDF Views:0
Authors
Affiliations
1 Production Engineering Department, Jadavpur University, Kolkata-700 032, IN
1 Production Engineering Department, Jadavpur University, Kolkata-700 032, IN
Source
Manufacturing Technology Today, Vol 4, No 6 (2005), Pagination: 8-12Abstract
The electrochemical discharge machining (ECDM) process is a non-conventional, thermoelectric, hybrid machining process, which uses electrochemical discharge phenomenon and has a great potential to machine an electrically non-conducting engineering ceramic like Silicon Nitride (Si3N4). The present research paper highlights on the development of a second order non-linear mathematical model that establishes a relationship between the penetration rate and different process parameters such as applied voltage, electrolyte concentration and inter-electrode gap utilising the experimentally obtained data during micro-drilling of silicon nitride by electrochemical discharge machining process. The experimentation has been conducted according to the central composite second order rotatable design based on Response Surface Methodology (RSM). The analysis of variance (ANOVA) has been performed to verify the adequacy of the aforesaid polynomial mathematical model. The parametric effects have also been studied based on the developed mathematical model for obtaining optimal penetration rate during micro-drilling of Silicon Nitride by ECDM process.- Analysis of Nd:YAG Laser Machining Parameters Based on Taguchi Method During Profile Generation
Abstract Views :183 |
PDF Views:0
Authors
Affiliations
1 Production Engineering Department, Jadavpur University, Kolkata-700032, IN
1 Production Engineering Department, Jadavpur University, Kolkata-700032, IN
Source
Manufacturing Technology Today, Vol 3, No 1 (2004), Pagination: 15-18Abstract
A Nd:YAG pulsed CNC laser machining-system has potential for precision machining operation on very hard conductive as well as non-conductive materials. For achieving high profile accuracy, the important process parameters such as the radio frequency of Q-switch, lamp current and cutting speed are to be optimally controlled because these controllable process parameters mostly affect the precision machining i.e. dimensional accuracy and surface roughness. In this present research, a hard cutting tool material has been chosen for generating intricate and accurate shape of cutting tool and the accuracy in profile cutting and surface roughness are considered as the responses of the Nd:YAG laser cutting operation. Taguchi method based parametric optimisation is applied for determining the optimal parametric combination for achieving high quality machining characteristics during Nd:YAG laser cutting operation. The confirmation test has also been carried out to predict and verify the adequacy of the additive model for determining the optimal machining characteristics.- Optimization of CNC-Wire Cut EDM parameters during Machining of AI/SiC-MMC based on Robust Design
Abstract Views :152 |
PDF Views:0
Authors
A. Manna
1,
B. Bhattacharyya
1
Affiliations
1 Production Engineering Department, Jadavpur University, Koikata-700032, IN
1 Production Engineering Department, Jadavpur University, Koikata-700032, IN
Source
Manufacturing Technology Today, Vol 2, No 8-9 (2003), Pagination: 3-7Abstract
In the experimental study, Taguchi method, a powerful tool in the design of experiment, is used to optimize the CNC-Wire cut-EDM parameters for effective machining of Ai-SiC MMC. From experimental results and through analysis of variance (ANOVA) the significant factors are determined for metal removal rate. Mathematical model relating to the machining performance of WEDM is established using Gauss elimination method for effective machining of AI/SiC-MMC. Confirmation test results show that the developed mathematical model is appropriate for effective machining of Al/SiC MMC and the determined optimal combination of CNC-Wire cut-EDM parameters can also satisfy the real requirement in practice.- Electrochemical Micromachining (EMM) System Development for Experimental Investigation
Abstract Views :162 |
PDF Views:0
Authors
B. Bhattacharyya
1,
J. Munda
1
Affiliations
1 Department of Production Engineering, Jadavpur University, Kolkata-700 032, IN
1 Department of Production Engineering, Jadavpur University, Kolkata-700 032, IN