Finite element analysis of the effects of tapered preforms on the final product in cold upsetting

The effects of the tapered preform shapes on the final product in cold upset forging are presented. As such, different preform geometries with different upset ratios are considered for the same final part geometry. In addition, the elastic-plastic finite element method is used to examine die filling and determine the flash volume in the final stage for different preform geometries. It is observed that, well-filled final products are obtained when the preform shapes and die cavities are designed according to the design rules.


Analysis of forging for three different alloy steels
Civelekoğlu, Barış; Darendeliler, Haluk; Gökler, Mustafa İlhan; Department of Mechanical Engineering (2003)
Forging is a manufacturing process which is preferred among the others in that, the final product shows more enhanced properties. The properties of the final product are directly related with the material used in the forging process. Main parameters such as forging temperature, number of stages, preform design, dimensions of the billet, etc. may be affected by the forging material. Alloys are one of the main areas of interest in the forging industry. The use of alloy steels may bring superior properties, es...
Analysis of tapered preforms in cold upsetting
Gökler, Mustafa İlhan; Darendeliler, Haluk (1999-01-01)
Upset forging is usually carried out with a sequence of stages and the tapered preforms are commonly used. The preforms should be free from flash formation and buckling injuries. :In this paper, the results that depend on elastic-plastic finite element analysis of taper upset forging are given. The buckling analysis was realized by using the Modified Riks method. For a given upset ratio which is the ratio of unsupported length to diameter of the initial billet, reduction in the height of the billet and the ...
Finite element analysis of header dies for taper upsetting
Ceran, M.; Gökler, Mustafa İlhan; Darendeliler, Haluk (2006-01-01)
In upset forging, the part is generally formed by a series of operations. Generally, taper upsetting stages are used as preforms. The geometry of the die cavity for the taper preforms can easily be determined from the dimensions of the hot part at the related stages; however the outer dimensions of the header die are determined by using some empirical formulae. In this paper, a commercial finite element code coupled with thermal analysis has been used to simulate hot upset forging process and to examine eff...
Modelling of variable friction in cold forging
Cora, Oe N.; Akkök, Metin; Darendeliler, Haluk (2008-11-01)
In metal forming operations, the friction between die and workpiece is a complex phenomenon and has a strong influence on the metal forming parameters and the product quality This study aims to investigate the effect of friction in cold forging operations using different friction models. In the analyses, the forging operations are simulated using the Coulomb and constant friction models, and the results are compared with the simulation results obtained by using the variable friction models developed by Wanh...
Finite element modelling of a composite wind turbine blade with fully-bonded and partically unbonded trailing edge
Özyıldız, Meltem; Çöker, Demirkan; Department of Aerospace Engineering (2018)
In this thesis, strength analysis of an existing 5-meter glass-fiber epoxy composite wind turbine blade subjected to monotonic loading condition is presented. Finite element analysis is employed to simulate the virtual testing of the blade and understand the failure modes/mechanisms which may lead to the ultimate failure of the blade. CAD Model of the blade is prepared using NX 10.0 and ANSYS ACP/Pre module is utilized for building the material model of the blade. The evaluation of the stresses is carried o...
Citation Formats
O. Dogan, M. İ. Gökler, and H. Darendeliler, “Finite element analysis of the effects of tapered preforms on the final product in cold upsetting,” Prague; Czech Republic, 2002, p. 105, Accessed: 00, 2021. [Online]. Available: