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Article
Experimental Study of Mechanical Properties of Type Linear Low Density Polyethylene and Mold Design

Authors: Samir A. Amin --- Ali Y. Hassan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 5 Part (A) Engineering Pages: 493-499
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In general, the manufacture of plastic materials is commonly in the world due to their applications. Plastic is light weight, cheap, and able to be used in different industries, for example parts of automotive and home tools. This research represents a challenge on how to design and manufacture a changeable mold. First, a mold was designed by the Auto CAD program and then manufactured in the workshop. The mold consists of three parts, the middle part has changeable cavity. The mold was cooled by worm net pipes embedded into the third part. All specimens were manufacture in this mold. The injection plastic flow is perpendicular on mold. The goals of this research are to design and manufacture a mold and to determine the mechanical properties of linear low density polyethylene. Three types of test were executed, tensile, impact and bending. The results of tensile test showed that the tensile strength value is 15 MPa, Young’s modulus is 0.18 GPa, yield stress is 12 MPa, and Elongation to break is 70.88 mm. From impact test, the impact strength is about 193.75 KJ/m2, while in bending test, the flexural strength is about 18 N/mm2 and the shear stress is 1.5 N /mm2.


Article
Using RSM Technique for Modeling and Optimization the Influence of Cutting Parameters on Tool Wear and Cutting Forces in Turning Operation

Authors: Asaad. A. Dabish --- Samir A. Amin --- Shaker S. Hassan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 3 Part (A) Engineering Pages: 234-247
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This study is an attempt to investigate the effect of cutting parameters on the cutting force and tool wear during turning of AISI 304 steel using tungsten carbide tool (WC). The first aim of present work was to employ the Response Surface Methodology (RSM) technique to obtain the influence of input machining parameters, such as cutting feed, cutting speed and cutting depth on the cutting force and wear of tool. Experiments were carried out in a 20 runs experimental matrix by a CNC machine according to the design matrices established by Design of Experiment (DOE) software 'version 8' with RSM technique. Cutting force was measured using a lathe dynamometer and tool wear with the help of an optical microscope. The relationships between parameters of machining and the responses (cutting tool wear and cutting force) were modeled and analyzed by RSM technique. ANOVA analysis was applied to study the impact of machining parameters on the outputs (responses) and to establish empirical equations for these responses in terms of input machining parameters. Significant quadratic models were developed with a probability (p-value ≤ 0.05) for both tool wear and cutting force. Results showed that the depth of cut is the most significant factor affecting the cutting force, closely followed by feed and cutting speed, whereas only the important parameter influencing the tool wear was appeared to be the cutting depth. Also, the results manifested that the optimum value for minimum tool wear and minimum cutting force was found at (80 m/min) cutting speed, (0.2 mm/rev) feed and (0.4 mm) cutting depth. A good agreement was found between the experimental and predicted results with a maximum error of 8%.


Article
Influence of SAW Welding Parameters on Microhardness of Steel A516-Gr60

Authors: Sadeq H. Bakhy --- Samir A. Amin --- Fouad A. Abdullah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 10 Part (A) Engineering Pages: 1039-1047
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Submerged Arc Welding (SAW) process is generally used for industries, such as petroleum storage tanks, pressure vessels, and structural components.Good mechanical properties of welded joint lead to crack-free strong joints. In this research, included angle, current, welding travel speed and arc voltage were utilized as welding parameters to weld ASTM A516 Grade 60 (low carbon steel). The experiments were carried out according to a design matrix that established by DOE (Version10) with RSM technique. Microhardness of welded samples was measured by a Digital Microhardness Tester, and then RSM technique was used to model and optimize the microhardness based on the welding parameters. The results showed that the including angle and welding current have a great effect on the microhardness. The optimum solution for minimum microhardness was found at 450 Amp welding current, 38 cpm welding speed, 34-volt arc voltage and included angle of 60⁰. The optimum value of microhardness was (186.7 HV). Eventually, the experimental and predicted results of microhardness were found in good agreement with 4.6%. maximum error.

Keywords

SAW --- Microhardness --- Welding parameters --- DOE --- RSM


Article
Studying and Modeling the Effect of Graphite Powder Mixing Electrical Discharge Machining on the Main Process Characteristics
دراسة ونمذجة تأثير التشغيل بالشرارة الكهربائية لمسحوق الجرافيت الممزوج على الخصائص الرئيسة للعملية

Authors: Ahmed N. Al-Khazraji احمد نايف الخزرجي --- Samir A. Amin سمير علي امين --- Saad M. Ali سعد محمود علي
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2015 Volume: 11 Issue: 3 Pages: 20-36
Publisher: Baghdad University جامعة بغداد

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Abstract

This paper concerned with study the effect of a graphite micro powder mixed in the kerosene dielectric fluid during powder mixing electric discharge machining (PMEDM) of high carbon high chromium AISI D2 steel. The type of electrode (copper and graphite), the pulse current and the pulse-on time and mixing powder in kerosene dielectric fluid are taken as the process main input parameters. The material removal rate MRR, the tool wear ratio TWR and the work piece surface roughness (SR) are taken as output parameters to measure the process performance. The experiments are planned using response surface methodology (RSM) design procedure. Empirical models are developed for MRR, TWR and SR, using the analysis of variance (ANOVA).The best results for the productivity of the process (MRR) obtained when using the graphite electrodes, the pulse current (22 A), the pulse on duration (120 µs) and using the graphite powder mixing in kerosene dielectric reaches (82.84mm³/min). The result gives an improvement in material removal rate of (274%) with respect to the corresponding value obtained when copper electrodes with kerosene dielectric alone. The best results for the tool wear ratio (TWR) of the process obtained when using the copper electrodes, the pulse current (8 A), the pulse on duration (120 µs) and using the kerosene dielectric alone reaches (0.31 %). The use of graphite electrodes, the kerosene dielectric with 5g/l graphite powder mixing, the pulse current (8 A), the pulse on duration (40 µs) give the best surface roughness of a value (2.77 µm).This result yields an improvement in SR by (141%) with respect to the corresponding value obtained when using copper electrodes and the kerosene dielectric alone with the same other parameters and machining conditions.

يعني هذا البحث بدراسة تأثير مسحوق الجرافيت الميكروي الممزوج في مائع الكيروسين العازل كهربائيا خلال عملية التشغيل بالقطع بالتفريغ الكهربائي مع خلط المسحوق (PMEDM) لقطع صلب عالي الكربون والكروم عالية نوع D2 . وقد تم استعمال نوع القطب (النحاس والجرافيت) وتيار النبضة وزمن استمرار النبضة ومسحوق الخلط في مائع الكيروسين العازل كمعاملات الإدخال الرئيسة للعملية. وقد اخذ كل من معدل ازالة المعدن و نسبة تآكل العدة والخشونة السطحية لقطعة العمل كمعاملات الإخراج لقياس أداء العملية. وقد تم اعداد التجارب العملية باستخدام منهجية استجابة السطح بوصفه أداة للتصميم . وتم تطوير موديلات تجريبية لمعدل ازالة المعدن و نسبة تآكل العدة والخشونة السطحية ، وذلك باستخدام طريقة تحليل التباين . ان أفضل النتائج التي تم الحصول عليها لزيادة كفاءة معدل الإنتاجية للعملية عند استخدام أقطاب الجرافيت وتيار النبضة مقداره (22 امبير) وزمن نبضة مدتها (120 ميكرو ثانية) وباستخدام مسحوق الجرافيت الممزوج في مائع الكيروسين العازل حيث بلغت (82.84 ملم³ / دقيقة). وهذه النتيجة تعطي تحسنا في معدل إزالة المادة تبلغ (274٪) نسبة للقيمة التي تم الحصول عليها عندما تم استعمال أقطاب النحاس مع الكيروسين العازل لوحده. كما ان أفضل النتائج التي تم الحصول عليها لنسبة تآكل العدة للعملية عند استخدام أقطاب النحاس وتيار النبضة مقداره (8 امبير) وزمن نبضة مدتها (120 ميكرو ثانية) وباستخدام الكيروسين العازل لوحده حيث بلغت (0.31٪) . كما ان استخدام أقطاب الجرافيت والكيروسين العازل مع 5 غم / لتر من مسحوق الخلط الجرافيتي وتيار نبضة مقداره (8 امبير) وزمن نبضة مدتها (40 ميكرو ثانية) يعطي أفضل خشونة سطحية قيمتها (2.77 ميكرومتر) ، وهذا النتيجة تعطي تحسنا في نعومة السطح بنسبة (141٪) نسبة للقيمة التي تم الحصول عليها عندما تم استعمال أقطاب النحاس ومائع الكيروسين العازل لوحده مع نفس المدخلاات والظروف الأخرى للتشغيل .

Keywords

EDM --- RSM --- MRR --- TWR --- SR --- AISI D2die steel --- graphite powder mixing.

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