The influence of the constitutive behaviour of materials on the formability in radial extrusion of tubular components

Arentoft, Mogens; Bjerregaard, Henrik; Andersen, Claus Bo; Wanheim, Tarras

doi:10.1016/s0924-0136(97)00301-4

Cited by 12 publications

(4 citation statements)

References 3 publications

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“…In other words, by applying a force in axial direction, material flows in radial direction. In this process one or two punches move axially causing a radial flow into a die cavity by means of which a flange is formed [1] . Due to non-homogeneous strain distribution and friction, warping may occur in area 1 and area 2 according to Fig1.…”

Section: Introductionmentioning

confidence: 99%

“…The other important issues are, homogeneous material deformation, optimization of forces and consumed energies, optimization of tool wear and controlling the material microstructure. M. Arentoft [1] studied different strain-hardening behaviors that are used in a commercially-available finite-element code, and verified finite-element simulations with metal forming experiments. Y. Qin [3] investigated, the production of thick-walled tubular components, they conducted finite element and experimenta analysis to study the of the polymers that were used as the pressurizing medium and examined process design and component quality.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Parameters Affecting Warping In Radial Forging Process

Djavanroodi¹,

Sabeghi²,

Abrinia³

2008

American J. of Applied Sciences

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Radial forging is a process in which one or two punches move axially causing a radial flow into a die cavity by means of which a flange is formed. During forging, warping, in which the lower face of thin flange rises from the die face may occur. To better understand the effect of parameters affecting the warping in radial forging a Finite Element analysis was used to simulate the process with isotropic elastic-plastic material model. Parameters such as die corner Radius (r) or shape and ring gap Height (H), on the warping, were investigated and results were compared with experimental work. It has been shown that increasing ring gap height and die corner radius will lead to warping reduction. Also it has been shown that special profile such as chamfered die, tapered ring gap, cosine profile and polynomial function may be used to reduce the warping

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the Parameters Affecting Warping In Radial Forging Process

Djavanroodi¹,

Sabeghi²,

Abrinia³

2008

American J. of Applied Sciences

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“…Such flange's defects can affect the desired die shape, process condition and even product reliability. Therefore, there have been many simulations and forming experiments to find the forming limit of radial extrusion [3][4][5]. Schatzle [6] proposed the forming limit of radial extrusion on flange forming by double action press experiment with AISI 1006 material.…”

Section: Introductionmentioning

confidence: 99%

A Numerical and Experimental Analysis on the Forming Limit of AA 3105 Aluminum Alloy in Radial Extrusion Process

Min

Ham

et al. 2007

KEM

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In this paper, the forming limit of flange in radial extrusion process was analyzed by the rigid-plastic finite element method. The selected model material for simulation and experiments was AA 3105 aluminum alloy. The predictions from simulation were made in terms of axial and circumferential strains. Experiments also have been conducted to compare with the simulation results with regards to deformation pattern. Furthermore, the deformation pattern in forming of flange section was closely investigated and categorized in three cases such as sticking, separating and cracking. The analysis in this paper is focused on the transient extrusion process of material flow into the gap in radial direction for different gap heights and die corner radii. The results of present study were summarized in terms of evolution of surface strains in axial and circumferential directions measured from the finite element meshes located in the region where surface cracking occurred in experiments. The forming limit line was drawn in the relationship of circumferential and axial strain. It was concluded from this study that the forming limit line is influenced mainly by circumferential strain on free surface of flange. It was also predicted that ductile fracture on flange surface is likely to occur in the middle of flange gap under the condition of sticking deformation and near bottom of flange gap under the condition of separating deformation, respectively. The forming limit of flange in terms of flange diameter was expected about 2.5do, which is 2.5 times the diameter of original billet.

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“…Radial-backward extrusion is commonly applied as a manufacturing process as well as a process in the metallurgical industry. It provides economical advantages such as high productivity, the retrenchment of manpower, and strength improvement of the product [1][2][3]. It is also noted that backward can extrusion is one of the most critical cold forging operations due to the very high normal pressure on the punch and the extremely severe tribological conditions at the contact between the punch land and the inner can wall [4].…”

Section: Introductionmentioning

confidence: 99%

The Forming Characteristics of AA 2024 Aluminium Alloy in Radial Extrusion Process Combined with Backward Extrusion

Jang¹,

Lee

et al. 2006

MSF

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Numerical analysis of radial extrusion process combined with backward extrusion has been performed to investigate the forming characteristics of an aluminum alloy in a combined extrusion process. Various variables such as gap size, die corner radius and frictional conditions are adopted as design or process parameters for analysis in this paper. The main investigation is focused on the analysis of forming characteristics of AA 2024 aluminum alloy in terms of material flow into backward can and radial flange sections. Due to various die geometries and process conditions such as frictional conditions, the material flow into a can and flange shows different patterns during the combined extrusion process and its characteristics are well summarized quantitatively in this paper in terms of forming load, volume ratio etc. Extensive simulation work leads to quantitative relationships between process conditions and the forming characteristics such as volume ratio of flange to can and the size of can and flange in terms of the can height extruded backward. It is easily seen from the simulation results that the volume ratio, which is defined as the ratio of flange volume to can volume, increases as the gap size and/or die corner radius increase. However, it is interesting to note that the frictional condition has little influence on the forming load and the deformation patterns. Usually, the frictional condition is a greatest process variable in normal forging operation. It might be believed from the simulation results that the frictional conditions are not a major process parameter in case of combined extrusion processes. It is also found that the can size, which is defined as the height of billet after forming, turns out to be even smaller than that of initial billet under a certain condition of die geometry.

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The influence of the constitutive behaviour of materials on the formability in radial extrusion of tubular components

Cited by 12 publications

References 3 publications

Analysis of the Parameters Affecting Warping In Radial Forging Process

Analysis of the Parameters Affecting Warping In Radial Forging Process

A Numerical and Experimental Analysis on the Forming Limit of AA 3105 Aluminum Alloy in Radial Extrusion Process

The Forming Characteristics of AA 2024 Aluminium Alloy in Radial Extrusion Process Combined with Backward Extrusion

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