فهرس المقالات کشش عمیق

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  1 - شبیه سازی تاثیر لقی بین سنبه و ماتریس بر حد نسبت کشش در فرآیند کشش عمیق فولاد زنگ نزن
  علی فتحی جوکندان مهرداد عضو امینیان
  کشش عمیق یکی از مهمترین فرآیندهای شکل دادن ورق های فلزی در صنعت می باشد که در آن یک ورق مسطح توسط سنبه به درون حفره ماتریس کشیده شده و شکل سنبه را به خود می گیرد. یکی از پارامترهای مهم در فرآیند کشش عمیق لقی بین سنبه و ماتریس می باشد که تاثیر بسزایی در حد نسبت کشش داشته أکثر

  کشش عمیق یکی از مهمترین فرآیندهای شکل دادن ورق های فلزی در صنعت می باشد که در آن یک ورق مسطح توسط سنبه به درون حفره ماتریس کشیده شده و شکل سنبه را به خود می گیرد. یکی از پارامترهای مهم در فرآیند کشش عمیق لقی بین سنبه و ماتریس می باشد که تاثیر بسزایی در حد نسبت کشش داشته و برای تولید اشکال پیچیده حائز اهمیت می باشد. یک ابزار مفید برای مطالعه این فرآیند و تاثیر پارامتر های موثر بر آن روش اجزاء محدود است. در این تحقیق اثر لقی بین سنبه و ماتریس بر حد نسبت کشش بررسی شد. و مشخص گردید که از میان لقی های انتخاب شده لقی 9/0 میلی متر مناسب ترین لقی برای ورق با ضخامت 6/0 میلی متر می باشد و با کاهش این لقی در 66/0 میلی متر حد نسبت کشش قطعه نیز کاهش خواهد یافت. تفاصيل المقالة
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  2 - Experimental and Numerical Studying of Earing in Deep Drawing of a Square cup Made of Al-Br Bilayer Sheet
  محمدحسین محمودیان
  One of the most important methods of forming sheets is the deep stretching of metal sheets. Deep tension is widely used in deforming sheet metal into hollow sheet metal. In this study, the deep tensile strength of sheets made of brass and aluminum is first simulated and أکثر

  One of the most important methods of forming sheets is the deep stretching of metal sheets. Deep tension is widely used in deforming sheet metal into hollow sheet metal. In this study, the deep tensile strength of sheets made of brass and aluminum is first simulated and investigated using practical experiments.The general structure of the dissertation is as follows: First, the records and researches that have been done inside and outside the country in the field of deep drawing of two-layer sheets so far have been introduced and the obtained results have been reviewed. in the following, practical experiments and experimental study of deep tensile strength of double-walled sheets and effective parameters in this process are discussed. To confirm the simulation results, a number of experiments are performed which are divided into twoparts: preliminary and main experiments. Also, how to do the simulation by Abacus software is explained step by step.The results of research conducted by Abacus software and practical experiments show that the way the layers are arranged in the mold affects the shrinkage of the sheets. Also, it has been found that the amount of force is inversely related to the amount of folding. Finally, suggestions are provided to continue working on this issu تفاصيل المقالة
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  3 - Investigation of Manufacturing Processes of the MetallicCNG Pressure Vessels
  مهدی ظهور محسن رحیمیان
  CNG vessels are used in many vehicles. Mass production of CNG pressure vessels requires exact understanding of process effective parameters. In this paper, the numerical analysis has been used to study the manufacturing parameters. The entire manufacturing processes, in أکثر

  CNG vessels are used in many vehicles. Mass production of CNG pressure vessels requires exact understanding of process effective parameters. In this paper, the numerical analysis has been used to study the manufacturing parameters. The entire manufacturing processes, including deep drawing, redrawing and ironing, of an aluminum liner sample of CNG pressure vessel (without spinning) have been simulated by Finite Element technique. The deep drawing process has been modeled by using flat dies. Then, drawing force and wall thickness variations have been studied. In order to achieve the final diameter of the liner, the redrawing process has been implemented in a flat die. To obtain a uniform wall thickness, the ironing process has been simulated in two stages, and the required force and the change of wall thickness for each process have been recorded. The results of this paper have been compared with the published results obtained by other researcher and found a good correlation between them. تفاصيل المقالة
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  4 - Numerical Determination of the Forming Limit Diagram for 304 Stainless Steel Based on Phase Change in Deep Drawing Process
  مسعود نصر اصفهانی مهران مرادی فرهاد حاجی ابوطالبی
  Up to now a large number of models have been developed to measure or predict the damage in equipments. Some of these models have been implemented in ABAQUS software. To implement damage parameters in the software, it is necessary to perform complex and expensive practic أکثر

  Up to now a large number of models have been developed to measure or predict the damage in equipments. Some of these models have been implemented in ABAQUS software. To implement damage parameters in the software, it is necessary to perform complex and expensive practical tests. One of these damage models is Forming Limit Diagram (FLD).The purpose of this research is deriving required parameters for modeling damage by numerical method and using of software. To study and compare of the accuracy of this method, these parameters have been derived with experimental method. FLD parameters for metastable austenitic stainless steel 304 have been extracted from Erichsen test and then phase change from austenite to martensite during deep drawing have been modeled with CLEMEX and SIGMAPLOT software. By defining changes of physical and mechanical properties of elastic-plastic material, the obtained results are transmitted to ABAQUS via developing a VUMAT subroutine in FORTRAN. Then Erichsen test has been simulated in ABAQUS and aforementioned subroutine was used to define changes of properties in simulation. Critical points susceptible for necking in all test cups are determined and numerical FLD was drawn based on principal strains in these points. Finally, the results of this method and practical tests were compared تفاصيل المقالة