research centers


Search results: Found 3

Listing 1 - 3 of 3
Sort by

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

Loading...
Loading...
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
Finite Element Analysis to Study The Effects Of The Workpiece flowStress Models on Cutting Variables in Orthogonal Cutting
دراسة تأثير نموذج إجهاد انسياب المشغولة على متغيرات القطع في قطع متعامد باستخدام طريقة العناصر المحددة

Author: Raheem Sadoon Jamel
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2012 Volume: 30 Issue: 14 Pages: 2507-2521
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

Turning process is a common machining process to produce cylindrical shape parts. Understanding of material removal concepts in metal cutting is very important in design process and cutting tool selection to ensure the quality of the products. For this purpose, orthogonal cutting simulations of AISI 1045 steel are performed and the model used in simulations is validated. Effects of work piece flow stressmodels on cutting variables such as cutting forces, chip geometry and temperature are investigated by comparing simulation results with experimental results available in the literature. Results show that flow stress models have a major effect on calculated results .The results of the simulations show that Oxley material model is able to give more accurate results for used cutting conditions in the analysis, however errors in calculating shear angle and thrust force are higher than Johnson-cook and Zerilli-Armstrong material models.

عملية الخراطة هي العملية التشغيل الشائعة لانتاج الاشكال الاسطوانية .فهم عملية ازالة المعدن جدا مهمة في عملية التصميم وختيار عدة القطع المناسبة لسيطرة على نوعية الانتاج . بستخدام العناصر المحددة AISI في هذا البحث تم محاكات عملية قطع متعامد لمعدن 1045 لدراسة تاثير اجهاد انسياب المشغولة على متغيرات القطع مثل قوى القطع ،هندسية العدة ودرجة Oxley , Johnson- الحرارة.تم محاكات ثلاث انواع من نماذج اجهاد انسياب المشغولة وهيومقارنة النتائج المحاكات مع النتائج العملية الموجود في Cook and Zerilli –Armstrong الادبيات . اظهرت نتائج المحاكات ان نموذج اجهاد الانسياب له تاثير رئيسي في النتائج .حيث ان يعطي اكثر دقة في حساب شروط القطع رغم الخطا في نتائج حساب زاوية القص Oxley نموذج وقوة الحرث اكثر من النموذجين الآخرين


Article
Finite Element Analysis is A Powerful Approach To Predictive Manufacturing Parameters

Author: Moaz H. Ali
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2018 Volume: 26 Issue: 1 Pages: 229-238
Publisher: Babylon University جامعة بابل

Loading...
Loading...
Abstract

Analytical formulations that is extremely important by understanding how can prepare the manufacturing process and the optimization of machining parameters such as cutting conditions, and tool geometries which is led to reduce the experimental tests needful. Finite element model belong numerical simulation method which is considered natural extension of analytical formulations as established a special relation to develop detailed of models during manufacturing process. It can provide detailed information from machining process that is depending on the cutting conditions such as cutting speed, chip formation, stress-strain analysis, and feed rate. The calibration procedure was carried out of finite element model and validation by comparing the experimental results and the corresponding numerical simulation data. The results indicate there is a good agreement between simulated values and experimental tests which depend to investigate on two types that is calibration and validation. This is because the validation of numerical simulation model and analytical formulations which is verified only when they have conform to experimental results. It concludes that the finite element model represents the real key to reduce the cost of manufacturing in terms of machining time saving and extend the duration of the cutting tool life.

الصيغ التحليلية التي هي في غاية الأهمية في فهم عملية التصنيع ولتحسين خواص معلمات القطع مثل ظروف و أداة القطع مما يؤدى إلى تقليل الاختبارات التجريبية المختبرية اللازمة. ان نمذجة العناصر تنتمي لطريقة المحاكاة العددية التي تعتبر امتدادا طبيعيا من الصيغ التحليلية وتؤسس لبناء علاقة خاصة لتطوير نماذج مفصلة و دقيقة خلال اجراء عملية التصنيع. ويمكن أن توفر معلومات مفصلة عن عملية القطع التي تعتمد على ظروف من اهمها سرعة القطع، وتشكيل الرقاقة، وتحليل الإجهاد والالتواء، ومعدل التغذية. نفذت عملية المعايرة ما بين نمذجة العناصر والتحقق من صحتها بمقارنة النتائج التجريبية المختبرية وبيانات المحاكاة العددية. تشير النتائج إلى وجود توافق جيد بين قيم المحاكاة والاختبارات التجريبية التي تعتمد على نوعين هما المعايرة والتحقق بينهما. ويرجع ذلك إلى ان التحقق من صحة نموذج المحاكاة العددية والتركيبات التحليلية التي تحققت قد اتفقت تماما مع النتائج التجريبية. ويستنتج من ذلك أن نمذجة العنصر يمثل المفتاح الحقيقي لخفض كلفة الانتاج من حيث توفير الوقت اللازم لعملية القطع واطالة عمر أداة القطع.

Listing 1 - 3 of 3
Sort by
Narrow your search

Resource type

article (3)


Language

English (3)


Year
From To Submit

2018 (2)

2012 (1)