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Article
Optimization Drilling Parameters of Aluminum Alloy Based on Taguchi Method
امثلية عوامل عملية التثقيب لسبائك الالمنيوم باعتماد طريقة تاكوجي

Author: Aseel Jameel Haleel اسيل جميل هـليل
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2018 Volume: 14 Issue: 2 Pages: 14-21
Publisher: Baghdad University جامعة بغداد

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Abstract

This paper focuses on the optimization of drilling parameters by utilizing “Taguchi method” to obtain the minimum surface roughness. Nine drilling experiments were performed on Al 5050 alloy using high speed steel twist drills. Three drilling parameters (feed rates, cutting speeds, and cutting tools) were used as control factors, and L9 (33) “orthogonal array” was specified for the experimental trials. Signal to Noise (S/N) Ratio and “Analysis of Variance” (ANOVA) were utilized to set the optimum control factors which minimized the surface roughness. The results were tested with the aid of statistical software package MINITAB-17. After the experimental trails, the tool diameter was found as the most important factor that has effect on the surface roughness. The optimal drilling factors that minimized the surface roughness are (20mm/min cutting speed, 0.2 mm/rev feed rate, and 10mm tool diameter).

في هذا البحث تم التركيز على امثلية عوامل التثقيب باستخدام (Taguchi method ) لغرض تقليل الخشونة السطحية. تم تثقيب (9 ثقوب) على عينة من سبيكة الالمنيوم 5050باستخدام بريمة تثقيب من الصلب عالي السرعة . تم استخدام ثلاث معاملات لعملية التثقيب بوصفها عوامل تحكم (سرعات القطع,معدلات التغذية وعدد القطع) واختيار المصفوفة القطرية (L9)لاجراء التجارب. استخدمت طريقة "تحليل التباين ANOVA" و (S/N ratio) لتحديد عوامل التثقيب المثلى التي تقلل من خشونة السطح. تم اختبار النتائج بمساعدة البرنامج الاحصائي (MINTAB17) وجد ان قطر البريمة هو العامل الاكثر تأثيراً على الخشونة السطحية والعوامل المثلى التي تم الحصول عليها لاقل خشونة هي (سرعة القطع 20ملم/دقيقة , معدل تغذية 0.2ملم/ دورة , قطر بريمة 10ملم).


Article
Burr Formation Mechanisms During Drilling Operations Of Low Carbon And Stainless Steels

Author: Samir Ali Amin Alrabii
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 6 Part (A) Engineering Pages: 1104-1115
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In drilling operations, burrs cause many problems for product quality and functionality. Therefore, understanding of burr formation mechanism is essential in order to reduce the deburring cost by reducing burr formation. Also, to avoid or minimize the burr formation during drilling, it is necessary to realize the relationship between the burr formation mechanism and the cutting parameters involved in the machining operations. Therefore, this research is an attempt to investigate experimentally the influence of using a wide range of cutting speeds, feed rates, and depth of cuts on the burr formation mechanism in drilling operations of low carbon and stainless steels plates using HSS cutting tools and cutting fluids. Additionally, this study was focused on the effect of these cutting parameters on the burr size and type. Thus, the average heights of exit formed burrs were measured at different machining conditions.Two types of burr mainly formed and observed (transient and uniform burrs) during drilling both steels. Accordingly, two types of burr formation mechanism related to these observed types of burr were explained. It was found that the average burr height for both steels generally reduced with increasing cutting speedsand feeds due to the change of burr type from a transient burr at lower cutting speeds and feeds to a uniform burr with and without a drill cap at higher speeds and feeds. Finally, no crown burr type formed and observed during drilling both steels in comparison with previous works.

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