An analysis of the closed-die forging of a general non-axisymmetric shape by the upper-bound elemental technique

Kwan, Chin Tarn

doi:10.1016/s0924-0136(02)00002-x

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…Therefore, boundaries A1G1 and BHIF satisfied the continuous conditions of deformation. The radial velocity U R in the boundary A1G1 and the circumferential velocity U h along the symmetric line were zero (Kwan 2002). The velocity distribution and the strain rates in this region were calculated as:…”

Section: Kinematically Admissible Velocitymentioning

confidence: 99%

Upper-bound and finite element analyses of multi-row sprocket during cold semi-precision forging process

Cheng

Chi

Wang

et al. 2015

Int J Coal Sci Technol

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The cold semi-precision forging of a multi-row sprocket was investigated using upper-bound (UB) and finite element methods combined with experiments. Based on the design of a new tooth profile for the sprocket, a cold semi-precision forging process and a kinematically admissible velocity field for filling the die cavity were proposed. Using the UB method, the velocity fields of the sprocket billet in the forming process were divided theoretically and calculated. The process of forging a multi-row sprocket was simulated using the FEM package Deform-3D V6.1 to obtain the distributions of the velocity field and the effective stress field in filling the die cavity. Similar to the simulated results, the experiment on cold forging a 5052 aluminum alloy sprocket was successfully performed. By comparing the calculated (UB method), experimental and simulated load-stroke curves, the calculated and simulated results were basically in accordance with the experimental results. The study provides a theoretical foundation for the development of the precision forging of multi-row sprockets.

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Section: Kinematically Admissible Velocitymentioning

confidence: 99%

Upper-bound and finite element analyses of multi-row sprocket during cold semi-precision forging process

Cheng

Chi

Wang

et al. 2015

Int J Coal Sci Technol

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“…Kwan [12] presented an analysis of closed-die forging for nonaxisymmetric shapes using the upper bound method. Saniee and Jaafari [13] examined closed-die forging analytically, numerically, and experimentally and compared the results from the different analyses for two axisymmetric parts.…”

Section: Introductionmentioning

confidence: 99%

Analytical and numerical study of the effect of the parting line position and shape in the forging process of parts with different shapes

Fatemi

Biglari

Noghabi

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part B:

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The position and shape of the parting line in forging dies have important effects on parameters such as forging force and energy, material flow, and amount of required material. An investigation was made of the effects of parting-line position on eight types of forged part classified into three main part shapes: axisymmetric parts with an element on one side, axisymmetric parts with elements on both sides, and long parts. For each part, maximum force and energy, material flow, and required material were calculated in different parting-line positions using the finite element method and analytical relationships, and results were compared. For long parts, in addition to different positions, different shapes of the parting line were also considered. In order to evaluate finite element and analytical results, experimental tests were performed on an axisymmetric part in three different parting-line positions. Good agreement among the three types of investigation was obtained.

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“…In recent years, finite element (FE) numerical simulation has become one main and valid method of analysing forging processes owing to the recent advancements in software development and availability of more powerful computers. In addition, since the FEM can simultaneously predict all the necessary stress-strain states in both the die and workpiece, extensive applications have been reported for the large-scale deformation forging processes (Kwan 2002, Lee, Kwon et al 2002, Koc and Arslan 2003. However, up to now, works on the process planning of cold forging have been mainly concentrated on the rotationally symmetric parts.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis and design of pinion with inner helical gear by FEM

Kang¹,

Kim²,

Kang³

2007

Virtual and Physical Prototyping

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In the design of the cold forging process one of the most important tasks is the determination of the required number of processes. Preforming in incremental steps is aimed at achieving high accuracy of the forged part, high quality of the surfaces and also decreasing the die damage during the forging process. Cold forging of pinion gear with shape of outer spur gear and inner helical gear have been investigated in this study. A numerical analysis for preform design substituting a cutting process in the gear forging was developed by means of upsetting process. By using the finite element (FE) program DEFORM-3D, the analysis is carried out. Using this simulation, the preform of the pinion and helical gear forging process was designed. The suggested valuable information regarding the forging process shows a successful attempt. The suggested process is verified by experiment. Compared to the traditional computer numerical control (CNC) processing, the upsetting process can form a preform without cutting, which leads to shorter forming time and reduced material usage.

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An analysis of the closed-die forging of a general non-axisymmetric shape by the upper-bound elemental technique

Cited by 7 publications

References 6 publications

Upper-bound and finite element analyses of multi-row sprocket during cold semi-precision forging process

Upper-bound and finite element analyses of multi-row sprocket during cold semi-precision forging process

Analytical and numerical study of the effect of the parting line position and shape in the forging process of parts with different shapes

Numerical analysis and design of pinion with inner helical gear by FEM

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