Incipient upsetting of solid cylinders between rigid and elastic tools

Soavi, F.; Tomesani, Luca; Zurla, O.

doi:10.1016/0020-7403(94)90016-7

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…The upsetting of solid cylinders is an important metal-forming operation [1]. Moreover, this process is used as a test for evaluating flow stress and friction [2].…”

Section: Introductionmentioning

confidence: 99%

An Upper Bound Solution for the Compression of an Orthotropic Cylinder

2021

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The upper bound theorem is used in conjunction with Hill’s quadratic yield criterion for determining the force required to upset a solid cylinder. The kinematically admissible velocity field accounts for the singular behavior of the real velocity field in the vicinity of the friction surface if the maximum friction law is adopted. The regime of sticking is also taken into consideration. The effect of this regime on the upper bound limit load is revealed. In particular, the kinematically admissible velocity field that includes the regime of sticking may result in a lower upper bound than that with no sticking. The boundary value problem is classified by a great number of geometric and material parameters. Therefore, a systematic parametric analysis of the effect of these parameters on the compression force is practically impossible. An advantage of the solution found is that it provides a quick estimate of this force for any given set of parameters.

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“…The upsetting of solid cylinders is an important metal-forming operation [1]. Moreover, this process is used as a test for evaluating flow stress and friction [2].…”

Section: Introductionmentioning

confidence: 99%

An Upper Bound Solution for the Compression of an Orthotropic Cylinder

2021

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“…[10] studied the deformation behavior of cast aluminium-4% copper-2% magnesium alloy in homogenized condition during upsetting at room temperature using a vision system. F. Soavl, et al 1994 [11] studied the non-uniform, cold deformation of an elastic, strain-hardening cylinder in axial compression between two rigid and two elastic dies with complete sticking to the die-workpiece interface using the finite element method. A. Jenner and B. Dodd 1981 [6] studied the maximum reduction in height obtainable in upsetting operations and dependence upon: the interfacial friction between the dies and workpiece, the geometry of the workpiece, the nature of the free surface and the ductility of the work material which is influenced by its prior deformation history.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of Hardness and Grain Size Variation in Cold Upset for Pure Copper Cylinder

Hassan¹,

Saleh²,

Jibar³

2015

ujme

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In this work, the influence of varied deformation percentages on the hardness and grain size, effective strain variation during simple upsetting is studied. Also, hardness variation in a typical cold upset forging process is predicted by relating hardness and effective strain evolution in a simple upsetting operation empirically. Five different deformation percentages, (13%, 17%, 32.4%, 41%, 50%), are considered for experimentation. Ring compression tests were conducted to determine the friction factor "m". The upset-forging tests were conducted at room temperate and for different deformation percentage on the pure copper cylindrical specimens of 30 mm diameter with aspect ratio (h o /d o) of 1.0. The distribution of hardness in the cold upset specimen was measured using the Brinell Hardness Tester. Also, this work discussing metallographic study of the upset specimens. The micrograph of samples is processed with the "Adobe Photoshop CS2" program and then applying the "Image J" program for estimating the average grain size. The upsetting operation was simulated using a commercial finite element code, ANSYS ver11.0. The results show that the finite element procedure is effective procedure to simulating cold upsetting process with maximum error (7.7%).

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“…Oh et al [5] used the rigid viscoptastic finite-element method to analyse the isothermal forging of a titanium alloy engine disk. Non-uniform deformation of an elastic, strain hardening cylinder in axial compression between two rigid and two elastic dies with complete sticking at the dieworkpiece interface was studied using the finite-element method [11]. Van Der Lugt and Huetink [6] presented a finite-element technique using a combined Eulerian-Lagrangian approach to solve incrementally the large displacement elastic-plastic problem coupled with the thermal problem.…”

Section: Introductionmentioning

confidence: 99%

Spring back phenomenon exhibited in the process of hollow cylinder upsetting

Lin

1998

Int J Adv Manuf Technol

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Spring back of the end surfaces of the billet and the elastic deflection of the dies in the process of hollow cylinder upsetting between elastic platens is investigated using a thermo-elasticplastic coupling model. The finite-element method and the finite-difference method are adopted to simulate the forming process, and the unloading process is performed on the elements of the workpiece in response to the spring back phenomenon accounted for in this study. Therefore, the effect of die elasticity on the variation of the inner surface profile of the hollow cylinder, predictions of forging load, and the distributions of temperature and strain components may be examined. The surface asperity of the billet and the forging load obtained by simulation agree quite well with the results of the upsetting experiment.

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Incipient upsetting of solid cylinders between rigid and elastic tools

Cited by 5 publications

References 11 publications

An Upper Bound Solution for the Compression of an Orthotropic Cylinder

An Upper Bound Solution for the Compression of an Orthotropic Cylinder

Experimental and Theoretical Study of Hardness and Grain Size Variation in Cold Upset for Pure Copper Cylinder

Spring back phenomenon exhibited in the process of hollow cylinder upsetting

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