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Home > Investigation of Variables Affecting Kerf Width Surface Roughness and Material Removal Rate in Wire Electrical Discharge Machining

Investigation of Variables Affecting Kerf Width Surface Roughness and Material Removal Rate in Wire Electrical Discharge Machining

Thesis Info

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Author

Shah, Aqueel

Program

PhD

Institute

University of Engineering and Technology

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2012

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/683

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726510682

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Wire-Electrical Discharge Machining (WEDM) is one of the non-conventional machining processes for machining hard to machine electrically conductive materials. It has been increasingly used in industry owing to its distinct advantages over the other cutting technologies. The process can only be employed effectively when all its properties and complexities are well understood. In addition many aspects of this technology require to be fully explored in order to increase its capabilities and cutting performance. This thesis contains an extensive literature review and an experimental work on the investigations of various variables in Wire-EDM. It is a fact that the substantial amount of work has been carried out on Wire-EDM, but a very little research has been reported on the influence of the variables such as the work piece thickness and hardness on various machining responses such as surface roughness, kerf width and material removal rate. Accordingly a detailed experimental investigation is presented in this thesis to study the various cutting performance measures in Wire-EDM over a wide range of variables or process parameters including workpiece thickness and hardness. The influence of all these variables/ control factors/ process parameters on the major cutting performance measures in Wire-EDM have been comprehensively discussed and analyzed under two sets of experiments. In the first set of experiments, the influence of eight variables including thickness has been studied on the machining responses such as kerf width, surface roughness, and VIIDepartment of Industrial and Manufacturing Engineering material removal rate. The workpiece material used was Tungsten Carbide. Eight variables including thickness have been taken with three levels each to determine their influence on the machining responses. In this the Taguchi Orthogonal Array has been used to reduce the number of runs for meaningful results. Tungsten Carbide workpieces were machined and the requisite response variables were measured. Likewise, in the second set of experiments the same material was taken and hardened to obtain two levels of hardness. The workpiece hardness was taken instead of thickness with four other variables having two levels each. This was done to validate the results of first experiment and also to see the influence of hardness. In both the experiments, ANOVA was carried out after obtaining the responses to determine the significant factors for each response. The result was consistent with the available literature however new facts were discovered in the case of workpiece thickness and hardness. Workpiece thickness appeared to be significant in case of surface roughness only and hardness was found significant in all the three cases. Finally the optimization of the machining responses was carried out using S/N ratio as specified by Taguchi method for the purpose of research papers publications.
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نواب میر عثمان علی خاں

نواب میر عثمان علی خان
افسوس ہے کہ آصف جاہی خاندان کے آخری فرمانروا نظام الملک آصفجاہ نواب میر عثمان علی خاں نے ۲۴؍ فروری کو جان جاں آفریں کے سپرد کری، وہ محض ایک والی ملک نہیں بلکہ اپنے اوصاف اور کارناموں کے لحاظ سے پوری تاریخ اور ایک عہد تھے، آصف جاہی حکومت اپنی تہذیب و روایات اور آئین و آداب میں تیموری حکومت کی جانشین تھی، اور میر عثمان علی خاں اس کی آخری یادگار تھے، انھوں نے اپنے دور میں جو گوناگوں کارنامے انجام دیے اس کی مثال ہندوستان کے کسی والی ریاست میں نہیں مل سکتی ہندوستان کا کوئی قومی و ملی ادارہ ان کی فیاضی سے محروم نہ تھا اور ان کا ابر کرم بلاتفریق مذہب و ملت سب پر یکساں برستا تھا، ان کی ذات سے سیکڑوں حاجت مند خاندانوں اور ہزاروں غرباء پرورش پاتے تھے، ان کی علم نوازی نے ہندوستان کے ہر فن کے اہل کمال کو حیدرآباد میں جمع کرکے بغداد و قرطبہ کی یاد تازہ کردی تھی، ان کا سب سے بڑا کارنامہ عثمانیہ یونیورسٹی ہے، جس میں جملہ جدید علوم کی تعلیم اردو زبان میں ہوتی تھی اور اس کے تعلیم یافتہ استعداد و قابلیت میں ہندوستان کی کسی یونیورسٹی کے طلبہ سے کم نہ تھے، یہ یونیورسٹی پورے ایشیا کے لیے قابل فخر تھی، مگر افسوس اندھے تعصب نے اس کو ختم کردیا اور اس کا بیش قیمت علمی ذخیرہ ردی بن کر رہ گیا جو پوری علمی دنیا کا سانحہ ہے۔
دولت کے لحاظ سے میر عثمان علی خاں دنیا کے امیر ترین آدمیوں میں تھے، حکومتوں اور بڑے بڑے بینکوں کو چھوڑ کر نقد سونے کی شکل میں اتنی دولت شاید ہی کسی فرد واحد کے پاس نکل سکے، اس ثروت کے ساتھ ان کی زندگی اتنی سادہ تھی کہ اس کا...

Compatibility of Education and Training in the Light of the Seerah of the Holy Prophet

Humankind has been granted a special status due to its being vicegerent of Allah on earth for he has been entrusted with the responsibility to keep order in the world according to the directives of its Creator. Humans are guided by Prophets in history. Some of these Prophets have got greater value, sphere and depth of influence on humanity due to different factors. Muhammad (Peace Be Upon Him) is the last Prophet of Allah, for the eternity and whole humanity. After him, Islam is completed for all times to come. Islam is a complete code of life; education and training constituting its crux. Prophet Muhammad (Peace Be Upon Him) was greatly concerned and cognizant of education and training of his followers which is evident from multifarious events of his life.  Major emphasis was laid on training coupled with education and both are, thus, inevitably interlocked with each other. It is clear that education was considered an assimilation of knowledge and training was taken as its reflection in daily life. The verses of the Holy Quran and sayings of the Holy Prophet (Peace Be Upon Him) bear a perfect testimony to this aspect of foremost significance. The earlier people in the fold of Islam were much concerned about training and nurturing, hence they avoided mere memorization of facts. The present paper is an attempt to discover the compatibility between education and training in the light of the paradigm of secret of the Prophet (Peace Be Upon Him) of Islam.

Effects of Different Preparations of Nigella Sativa Ns on Glucose and Lipid Metabolism in Type Ii Diabetic Patients

The basic aim of this placebo control study was to investigate the effects of three different preparations of Nigella sativa especially on glucose and lipid metabolism in type 2 diabetes mellitus (DM2) patients (group-A); however normal individuals (group- B) was also studied. Both groups were treated with N. sativa Seed Powder (NsP), N. sativa Aqueous Extract (NsE) and N. sativa Oil (NsO), in addition to a placebo in phases 1, 2 and 3 respectively. Each phase was of 80 days (40 days of treatment with N. sativa preparation followed by 40 days of placebo administration). Levels of 0 day were taken as base line (concurrent control) in each phase. Fasting blood levels of glucose, insulin, total cholesterol (TC), LDL & HDL cholesterols, triglycerides (TG), total leukocyte & platelet counts, hepatic profile and blood urea were determined in subjects of both groups on 0, 40 and 80 th day of each phase of the study. In phase-1 a highly significant fall in fasting blood glucose, TC, LDL cholesterol and TG while an increase in insulin and HDL was observed in group-A after treatment with NsP as compared to concurrent control. These levels significantly reversed at the end of placebo except the HDL cholesterol. Almost similar results were obtained in subjects of group-B. In phase-2 although a decrease in glucose and increase in insulin levels was observed in group-A after treatment with NsE; which reversed after the placebo yet the changes were not significant. However a significant fall was observed in TC and TG levels of diabetics after NsE treatment; which reversed after the placebo significantly in TG but insignificantly in TC. In group B, results regarding glucose and insulin levels were similar to that of group-A of this phase. Concerning lipid profile, a significant fall in TG and insignificant decrease in TC and LDL cholesterol was observed after NsE treatment. The changes reversed after the placebo, significantly in TG and LDL cholesterol but insignificantly in TC. In phase-3, a significant fall in fasting blood glucose and a rise in insulin levels was observed in group-A after treatment with NsO2 as compared to concurrent control levels. A significant decrease in LDL & increase in HDL was observed while TC remained statistically unchanged; however a significant increase was also recorded in TG after NsO treatment. LDL and TG levels reversed significantly, while no significant change was observed in HDL and TC levels after the placebo. Subjects of group-B behaved similar to group-A, as for glucose and insulin are concerned. Regarding lipids, a decrease in LDL cholesterol (significant) and TC (insignificant) while increase in HDL cholesterol and TG (insignificant) was observed in group-B after the use of NsO. LDL and TC increased significantly after the placebo while no significant change was recorded in HDL cholesterol and TG. Total leukocyte and platelet counts remained statistically unchanged in both groups A and B, when treated with NsP, NsE, NsO or administered with placeboes in phases 1, 2 and 3 respectively as compared to their base line levels Similarly no unpleasant effect of any of the N. sativa preparation was observed regarding hepatic profile, blood urea and the subjective feelings of the diabetic and normal individuals. In the light of foregoing facts it can safely be concluded that all preparations of N. sativa had some or more antidiabetic effect. However keeping in view the overall performance, NsP was found more effective. Further large scale human studies with different dose schedules of NsP are recommended.