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Ahsan Ali Khan - One of the best experts on this subject based on the ideXlab platform.
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Application of Silicon Carbide in Abrasive Water Jet Machining
Silicon Carbide - Materials Processing and Applications in Electronic Devices, 2011Co-Authors: Ahsan Ali Khan, Mohammad Yeakub AliAbstract:Silicon carbide (SiC) is a compound consisting of silicon and carbon. It is also known as carborundum. SiC is used as an abrasive material after it was mass produced in 1893. The credit of mass production of SiC goes to Edward Goodrich Acheson. Now SiC is used not only as an abrasive, but it is also extensively used in making cutting tools, structural material, automotive parts, electrical systems, nuclear fuel parts, jewelries, etc. AWJM is a well-established non-traditional Machining technique used for cutting difficult-to machine materials. Nowadays, this process is being widely used for Machining of hard materials like ceramics, ceramic composites, fiber-reinforced composites and titanium alloys where conventional Machining fails to machine economically. The fact is that in AWJM no heat is developed and it has important implications where heat-affected zones are to be avoided. AWJM can cut everything what traditional Machining can cut, as well as what traditional Machining cannot cut such as too hard material (e.g. carbides), too soft material (e.g. rubber) and brittle material (e.g. glass, ceramics, etc.). The basic cutting tool used in Water Jet Machining is highly pressurized Water that is passed through a very small orifice, producing a very powerful tool that can cut almost any material. Depending on the materials, thickness of cut can range up to 25 mm and higher (Kalpakjian & Schmid, 2010). A Water Jet system consists of three components which are the Water preparation system, pressure generation system and the cutting head and motion system.
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performance of different abrasive materials during abrasive Water Jet Machining of glass
Journal of Materials Processing Technology, 2007Co-Authors: Ahsan Ali Khan, Md Mohafizul HaqueAbstract:Abstract Different types of abrasives are used in abrasive Water-Jet Machining like garnet, aluminum oxide, olivine, silica sand, silicon carbide, etc. The present work gives a comparative analysis of the performance of garnet, aluminum oxide and silicon oxide during abrasive Water-Jet Machining of glass. The study showed that width of cut increases as the stand-off distance of the nozzle from the work is increased which is due to divergence shape of the abrasive Water-Jet. However, the garnet abrasives produce the smallest width of cut followed by aluminum oxide and silicon carbide. This is because of higher hardness and cutting ability of silicon carbide followed by aluminum oxide and garnet. It was also noticed that width of cut reduces with the increase of feed rate. With the increase in work feed rate, the work is under the Jet for a shorter time which causes a smaller width of the slots. Again, width of cut was found to be the smallest while using garnet abrasives followed by aluminum oxide and silicon carbide. The taper of the cut slot was found to be higher at a greater stand-off distance and work feed rate, but smaller at a higher pressure. Since silicon carbide is very hard, it maintains its cutting ability as the abrasives move down. As a result, the difference of the width at the Jet entrance and the Jet exit is not significant. This causes a smaller taper of the cut slots. The width of the cut slot was found to increase with increase in Jet pressure. At a higher Jet pressure the kinetic energy of the abrasives increases, resulting an enhanced cutting ability of the abrasives and causes widening of the cut slots. Due to higher hardness, silicon carbide produced the maximum width of cut followed by aluminum oxide and garnet.
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surface roughness of carbides produced by abrasive Water Jet Machining
Journal of Applied Sciences, 2005Co-Authors: Ahsan Ali Khan, Mohd Efendee Bin Awang, Ahmad Azwari Bin AnnuarAbstract:This study presents the effect of Jet pressure, abrasive flow rate and work feed rate on smoothness of the surface produced by abrasive Water Jet Machining of carbide of grade P25. Carbide of grade P25 is very hard and cannot he machined by conventional techniques. Cutting was perfonned on a Water Jet machine model W J 4080. The ab rasive used in investigations was garnet of mesh size 80. It was tried to cut carbide with low and medium level of abrasive flow rate, hut the Jet failed to cut carbide since it is too hard and very high level of energy is required. Minimum rate of abrasive flow that made it possible to cut carbide efficiently was 135 g min-I . It was found from the investigations that with increase in Jet pressure the surface becomes smoother due to higher kinetic energy of the abrasives. But the surface near the j et entrance is smoother and the surface gradually becomes rougher downwards and is the roughest near the Jet exit. Increase in abrasive flow rate also makes the surface smoother which is due to the availability of higher number of cutting edges per unit area per unit time. Feed rate didn't show significant influence on the machined surface, but it was found that the surface roughness increases drastically near the Jet entrance.
Mahabalesh Palleda - One of the best experts on this subject based on the ideXlab platform.
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a study of taper angles and material removal rates of drilled holes in the abrasive Water Jet Machining process
Journal of Materials Processing Technology, 2007Co-Authors: Mahabalesh PalledaAbstract:Abstract The objective of this paper is to study the effect of using different chemicals on material removal rate, with varied stand off distances and chemical concentration in abrasive Water Jet Machining. The use of such chemicals on the taperness of drilled holes is also studied. The study reveals the use of polymer can reduce the taper of the holes drilled.
M. A. Azmir - One of the best experts on this subject based on the ideXlab platform.
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A study of abrasive Water Jet Machining process on glass/epoxy composite laminate
Journal of Materials Processing Technology, 2009Co-Authors: M. A. Azmir, Amimul AhsanAbstract:Abstract Surface roughness (Ra) and kerf taper ratio (TR) characteristics of an abrasive Water Jet machined surfaces of glass/epoxy composite laminate were studied. Taguchi's design of experiments and analysis of variance were used to determine the effect of Machining parameters on Ra and TR. Hydraulic pressure and type of abrasive materials were considered as the most significant control factor in influencing Ra and TR, respectively. Due to hardness of aluminium oxide type of abrasive materials, it performs better than garnet in terms of both Machining characteristics. Increasing the hydraulic pressure and abrasive mass flow rate may result in a better Machining performance for both criteria. Meanwhile, decreasing the standoff distance and traverse rate may improve both criteria of Machining performance. Cutting orientation does not influence the Machining performance in both cases. So, it was confirmed that increasing the kinetic energy of abrasive Water Jet Machining (AWJM) process may produce a better quality of cuts.
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a study of abrasive Water Jet Machining process on glass epoxy composite laminate
Journal of Materials Processing Technology, 2009Co-Authors: M. A. Azmir, Amimul AhsanAbstract:Abstract Surface roughness (Ra) and kerf taper ratio (TR) characteristics of an abrasive Water Jet machined surfaces of glass/epoxy composite laminate were studied. Taguchi's design of experiments and analysis of variance were used to determine the effect of Machining parameters on Ra and TR. Hydraulic pressure and type of abrasive materials were considered as the most significant control factor in influencing Ra and TR, respectively. Due to hardness of aluminium oxide type of abrasive materials, it performs better than garnet in terms of both Machining characteristics. Increasing the hydraulic pressure and abrasive mass flow rate may result in a better Machining performance for both criteria. Meanwhile, decreasing the standoff distance and traverse rate may improve both criteria of Machining performance. Cutting orientation does not influence the Machining performance in both cases. So, it was confirmed that increasing the kinetic energy of abrasive Water Jet Machining (AWJM) process may produce a better quality of cuts.
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Effect of abrasive Water Jet Machining parameters on aramid fibre reinforced plastics composite
International Journal of Material Forming, 2009Co-Authors: M. A. Azmir, A. K. Ahsan, A RahmahAbstract:This paper presents a study on the effect of abrasive Water Jet Machining (AWJM) process parameters on surface roughness ( R _a) and kerf taper ratio ( T _R) of aramid fibre reinforced plastics (AFRP) composite. Taguchi’s design of experiment was used as the experimental approach. Through analysis of variance (ANOVA), it was found that the traverse rate was considered to be the most significant factor in both R _a and T _R quality criteria. R _a and T _R were reduced as increasing the hydraulic pressure and reducing the standoff distance and traverse rate. However, there was no clear pattern for abrasive mass flow rate on both R _a and T _R. Therefore, it was confirmed that increasing the kinetic energy of Water Jet may produce a better quality of cuts. Mathematical models were also developed using multiple linear regression analysis to predict the performance of R _a and T _R in terms of AWJM process parameters. Considerably, the models are useful in predicting R _a and T _R in AWJM of AFRP laminate as shown in present study.
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investigation on glass epoxy composite surfaces machined by abrasive Water Jet Machining
Journal of Materials Processing Technology, 2008Co-Authors: M. A. Azmir, Amimul AhsanAbstract:Experimental investigations were conducted to assess the influence of abrasive Water Jet Machining (AWJM) process parameters on surface roughness (Ra) of glass fibre reinforced epoxy composites. The approach was based on Taguchi's method and analysis of variance (ANOVA) to optimize the AWJM process parameters for effective Machining. It was found that the type of abrasive materials, hydraulic pressure, standoff distance and traverse rate were the significant control factors and the cutting orientation was the insignificant control factor in controlling the Ra. For noise factors effect, the forms of glass fibres and thickness of composite laminate showed the greatest influence on Ra. A Mathematical model was developed using piecewise linear regression analysis to predict the performance of Ra in terms of the cutting parameters of AWJM. The models successfully predicted the Ra of an AWJ machined glass/epoxy laminate within the limit of this study. Verification of the improvement in the quality characteristics has been made through confirmation test with respect to the chosen reference parameter setting. It was confirmed that the determined optimum combination of AWJM parameters satisfy the real need for Machining of glass fibre reinforced epoxy composites in practice.
Md Mohafizul Haque - One of the best experts on this subject based on the ideXlab platform.
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performance of different abrasive materials during abrasive Water Jet Machining of glass
Journal of Materials Processing Technology, 2007Co-Authors: Ahsan Ali Khan, Md Mohafizul HaqueAbstract:Abstract Different types of abrasives are used in abrasive Water-Jet Machining like garnet, aluminum oxide, olivine, silica sand, silicon carbide, etc. The present work gives a comparative analysis of the performance of garnet, aluminum oxide and silicon oxide during abrasive Water-Jet Machining of glass. The study showed that width of cut increases as the stand-off distance of the nozzle from the work is increased which is due to divergence shape of the abrasive Water-Jet. However, the garnet abrasives produce the smallest width of cut followed by aluminum oxide and silicon carbide. This is because of higher hardness and cutting ability of silicon carbide followed by aluminum oxide and garnet. It was also noticed that width of cut reduces with the increase of feed rate. With the increase in work feed rate, the work is under the Jet for a shorter time which causes a smaller width of the slots. Again, width of cut was found to be the smallest while using garnet abrasives followed by aluminum oxide and silicon carbide. The taper of the cut slot was found to be higher at a greater stand-off distance and work feed rate, but smaller at a higher pressure. Since silicon carbide is very hard, it maintains its cutting ability as the abrasives move down. As a result, the difference of the width at the Jet entrance and the Jet exit is not significant. This causes a smaller taper of the cut slots. The width of the cut slot was found to increase with increase in Jet pressure. At a higher Jet pressure the kinetic energy of the abrasives increases, resulting an enhanced cutting ability of the abrasives and causes widening of the cut slots. Due to higher hardness, silicon carbide produced the maximum width of cut followed by aluminum oxide and garnet.
Mangesh Y. Khalkar - One of the best experts on this subject based on the ideXlab platform.
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improving the quality characteristics of abrasive Water Jet Machining of marble material using multi objective artificial bee colony algorithm
Journal of Computational Design and Engineering, 2018Co-Authors: Padmakar J. Pawar, Umesh S. Vidhate, Mangesh Y. KhalkarAbstract:Abstract Although abrasive Water Jet Machining has proved its capabilities for cutting marble material in a most economic and environment friendly manner, is facing serious issues related to dimensional inaccuracy and striation marks. This has put limit on its applications. Also, due to complex nature of abrasive Water Jet Machining process, it is very difficult to control all three quality factors i.e. kerf taper, kerf width, striation marks simultaneously to achieve desired quality. This work therefore deals with multi-objective optimization considering three objectives as: minimization of kerf width, minimization of kerf taper, and maximization of depth of striation free surface in abrasive Water Jet Machining process. The response surface modeling is used to establish the relation between various input parameters such as stand of distance, traverse speed, Water pressure, and abrasive flow rate, with objectives mentioned above. Application of well-known meta-heuristics named artificial bee colony algorithm is extended to multi-objective optimization with posteriori approach by incorporating the concept of non-dominated sorting. Set of Pareto optimal solutions obtained by this proposed approach provides a ready reference for selecting most appropriate parameter setting on the machine with respect to objectives considered in this work.
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Improving the quality characteristics of abrasive Water Jet Machining of marble material using multi-objective artificial bee colony algorithm
Elsevier, 2018Co-Authors: Padmakar J. Pawar, Umesh S. Vidhate, Mangesh Y. KhalkarAbstract:Although abrasive Water Jet Machining has proved its capabilities for cutting marble material in a most economic and environment friendly manner, is facing serious issues related to dimensional inaccuracy and striation marks. This has put limit on its applications. Also, due to complex nature of abrasive Water Jet Machining process, it is very difficult to control all three quality factors i.e. kerf taper, kerf width, striation marks simultaneously to achieve desired quality. This work therefore deals with multi-objective optimization considering three objectives as: minimization of kerf width, minimization of kerf taper, and maximization of depth of striation free surface in abrasive Water Jet Machining process. The response surface modeling is used to establish the relation between various input parameters such as stand of distance, traverse speed, Water pressure, and abrasive flow rate, with objectives mentioned above. Application of well-known meta-heuristics named artificial bee colony algorithm is extended to multi-objective optimization with posteriori approach by incorporating the concept of non-dominated sorting. Set of Pareto optimal solutions obtained by this proposed approach provides a ready reference for selecting most appropriate parameter setting on the machine with respect to objectives considered in this work. Keywords: Abrasive Water Jet Machining, Kerf width, Kerf taper, Striation marks, Multi-objective artificial bee colony algorith
