Analytical model to estimate force of constrained groove pressing process

Nazari, Farshad; Honarpisheh, Mohammad

doi:10.1016/j.jmapro.2018.01.015

Cited by 26 publications

(20 citation statements)

References 31 publications

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“…According to the previous study on CGP process, 35 the CGP process is performed in three sections of bending, stretching and pressing. First, deformation begins with two bends, one at each the start and end of the deformation area (shear region).…”

Section: Deformation Geometry In the Cgp Processmentioning

confidence: 99%

“…Deformation in bending section is local and small, so it can be neglected in this section. 35,36 As forming continues, because the gap between the pair dies is wider than the sheet thickness, the sheet is not in contact with the dies at deformation region and is only stretched by the dies. This part of forming is called stretching section.…”

Section: Deformation Geometry In the Cgp Processmentioning

confidence: 99%

“…The relation between the gap of the pair dies in deformation region and grooves angle is expressed by equation (1). 35 This equation indicates if the die angle is smaller than 60°, at first, deformation begins as stretching and then shifts to pressing, but if the die angle is greater than or equal to 60°, forming begins as pressing, and the sheet may be damaged, and the process might not be feasible. Wang et al.…”

Section: Deformation Geometry In the Cgp Processmentioning

confidence: 99%

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Analytical and experimental investigation of deformation in constrained groove pressing process

Nazari

Honarpisheh

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Constrained groove pressing process is a severe plastic deformation method, which can improve the properties of a metal sheet. The purpose of this research is to investigate the effect of deformation behavior and effective strain on the constrained groove pressed sheet properties. For this aim, deformation procedure and effective strain were investigated based on analytical relations and deformation geometry. Formation in the constrained groove pressing process was divided into the bending, stretching, and pressing sections, and the respective contribution of each in the formation procedure was evaluated. Then, the effect of main sections on the formation force, mechanical properties, and microstructure of constrained groove pressed sheets was determined by an experimental study. According to the analytical results, about 41.4% of the formation procedure occurs in the pressing section, creating 70% more effective strain than stretching section. Thus, the pressing section has a significant effect on the properties of constrained groove pressed sheets. The pressing section, due to more effective strain than the stretching section, creates 36% more yield strength, 14.6% more surface hardness, 37.6% more homogeneity and 22.6% smaller grain size. But, compared to the stretching section, the pressing section reduces elongation about 42.8%. So, to produce sheets with high ultimate strength and good formability, using the constrained groove pressing process in the stretching section is more effective.

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Section: Deformation Geometry In the Cgp Processmentioning

confidence: 99%

Section: Deformation Geometry In the Cgp Processmentioning

confidence: 99%

Section: Deformation Geometry In the Cgp Processmentioning

confidence: 99%

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Analytical and experimental investigation of deformation in constrained groove pressing process

Nazari

Honarpisheh

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…[7][8][9] In recent years, SPD techniques are widely applied in producing the UFG structures in bulk metallic alloys. [10][11][12][13][14] Equal channel angular pressing (ECAP), 15,16 high pressure torsion (HPT), equal channel angular rolling (ECAR), [18][19][20] constrained groove pressing, [21][22][23][24][25] non-equal channel angular pressing 26 and cyclic close die forging (CCDF) 27 are some of the SPD processes which have been recently investigated.…”

Section: Introductionmentioning

confidence: 99%

The effects of combined cyclic close die forging and aging process on microstructure and mechanical properties of AA7075

Moazam

Honarpisheh

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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It is well known that applying severe plastic deformation methods on the precipitation hardenable aluminum alloys at room temperature is very difficult because of crack formation and segmentation of the specimen during the processes. In this study, several procedures were experimentally examined for performing the cyclic close die forging (CCDF) and improving the mechanical properties of AA7075. The experimental tests revealed that supersaturated solid solution of AA7075 after water quenching is formable for only about 5 min and performing the CCDF process in this limited time is possible. Optical and scanning electron microscopy and transmission electron microscopy were used to study the microstructure of the processed samples. It was observed that by applying two passes of CCDF, the grain size of the material reduced from 30 µm to about 200–300 nm. In addition, the X-ray diffractometer results demonstrated that Guinier–Preston zone picks of the processed samples are very weak and the equilibrium η-phase does not exist in none of the suggested procedures. Furthermore, it was found that by combining CCDF and aging processes according to the proposed procedures, the mechanical properties of the processed AA7075 were improved when compared with the AA7075-T6. To put it more clearly, micro-hardness, yield strength and ultimate tensile stress of the processed sample were improved as much as 38.6%, 25% and 23%, respectively.

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“…Aşırı plastik deformasyon (APD), malzemelerin çok büyük plastik deformasyona uğramasından dolayı ultra ince taneli ve nano yapılı metal şekillendirme yöntemi olarak tanımlanabilir [1][2][3]. Aşırı plastik deformasyon, malzemenin mukavemetinde artış sağlayacak şekilde malzeme tane boyutunu nano (100 nm'den daha küçük) ve ultra ince taneye (100 nm -1 µm) düşürmektedir.…”

Section: Introductionunclassified

Boruların Çift Geçişli Paralel Tüp Kanal Açısal Presleme (DP- PTCAP) Yöntemi ile Aşırı Plastik Deformasyon Analizi

Taşdemir

2020

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Öz: Aşırı plastik deformasyon (APD), nano yapılı ve ultra ince taneli malzemeler elde edilmesi amacı ile kullanılan bir yöntemdir. Tüp şeklindeki malzemelerin aşırı plastik deformasyonunda kullanılan birçok yöntem vardır. Bu yöntemlerden biri de paralel tüp kanal açısal presleme (PTCAP) yöntemidir. Bu çalışmada, boru şeklindeki parçaların deformasyonu çift geçişli paralel tüp kanal açısal presleme (DP-PTCAP) metodu kullanılarak araştırılmıştır. Analizlerde, 5 farklı kanal açısı, 4 farklı kesit genişleme oranı ve 4 farklı boyutsuz uzunluk kullanılmıştır. Bu parametrelerin elde edilen tüp (boru) şeklindeki parçaların gerilme, birim şekil değişimi ve şekillendirme kuvvetine etkileri sonlu elemanlar yöntemi ile analiz edilmiştir. Çalışmada AA6061 malzeme kullanılmıştır. Analizler sonucunda, kanal açısının artması ile efektif birim şekil değişimi, şekillendirme kuvveti ve malzemede oluşan gerilmenin azaldığı görülmüştür. Çift geçişli kalıplarla elde edilen malzemelerin birim şekil değişiminin tek geçişli kalıplara nazaran daha yüksek olduğu belirlenmiştir. Yapılan çalışma sonucu analizlerden elde edilen birim şekil değişimine bakarak çift geçişli kalıplar ile elde edilen malzemelerin tane yapısının tek geçişli kalıplara nazaran daha ince taneli olduğu söylenebilir.

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Analytical model to estimate force of constrained groove pressing process

Cited by 26 publications

References 31 publications

Analytical and experimental investigation of deformation in constrained groove pressing process

Analytical and experimental investigation of deformation in constrained groove pressing process

The effects of combined cyclic close die forging and aging process on microstructure and mechanical properties of AA7075

Boruların Çift Geçişli Paralel Tüp Kanal Açısal Presleme (DP- PTCAP) Yöntemi ile Aşırı Plastik Deformasyon Analizi

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