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Article
An Analysis of Strain Rate Distribution Using Streamline Model and A Quick Stop Device in Metal Cutting

Authors: Osama A. Kadhim --- Fathi A. Alshamma
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2019 Volume: 22 Issue: 2 Pages: 136-142
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

In this paper, a quick stop device technique and the streamline model were employed to study the chip formation in metal cutting. The behavior of chip deformation at the primary shear zone was described by this model. Orthogonal test of turning process over a workpiece of the 6061-T6 aluminum alloy at different cutting speeds was carried out. The results of the equivalent strain rate and cumulative plastic strain were used to describe the complexity of chip formation. Finite element analysis by ABAQUS/explicit package was also employed to verify the streamline model. Some behavior of formation and strain rate distribution differs from the experimental results, but the overall trend and maximum results are approximately close. In addition, the quick stop device technique is described in detail. Which could be used in other kinds of studies, such as the metallurgical observation.


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

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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.

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