Analysis of tapered preforms in cold upsetting

Date

1999-01-01

Author

Gökler, Mustafa İlhan
Darendeliler, Haluk

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

142
views

0
downloads

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 diameter ratio are the important design parameters in taper upsetting. For several values of the design parameters, the analysis has been carried out and the results have been compared with the results of the well-known Meyer's experiment and Gokler's suggestions. In the analysis, the perfectly square end (ideal billet case) and the end with face inclination angle were considered as two different end conditions of the billet. The results for the ideal billet case are in good-agreement with Meyer's results. The end-face inclination angle, which is a significant imperfection on the billet, reduces the limits of allowable upset ratio. It has been observed that although the tapered header dies designed at the limits suggested by Meyer produce flashless preforms, in some of the cases, injuries due to buckling are not eliminated. However, Gokler's suggested limits provide elimination of both flash formation and injuries due to buckling.

Subject Keywords

Upset forging, Forging preform, FEA, Buckling

URI

https://hdl.handle.net/11511/53747

Journal

INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

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 and preform design for long press forgings with non-planar parting surfaces Karagözler, Ahmet Barış; Gökler, Mustafa İlhan; Darendeliler, Haluk; Department of Mechanical Engineering (2003) In industry, a wide variety of parts are produced by press forging. Press forging generally requires sequential forming of workpieces through a set of preforming stages before the final stage. The design of preform dies affects die and product cost and quality. To ensure complete filling of the die at the final stage, companies in the forging industry commonly add extra material to the original workpiece volume and accordingly design the perform dies by the help of their experience. However, this method ref...
Analysis of warm forging process Aktakka, Gülgün; Darendeliler, Haluk; Department of Mechanical Engineering (2006) Forging is a metal forming process commonly used in industry. Forging process is strongly affected by the process temperature. In hot forging process, a wide range of materials can be used and even complex geometries can be formed. However in cold forging, only low carbon steels as ferrous material with simple geometries can be forged and high capacity forging machinery is required. Warm forging compromise the advantages and disadvantages of hot and cold forging processes. In warm forging process, a product...
Analysis of flexible pavements incorporating nonlinear resilient behavior of unbound granular layers Karagöz, Cem; Acar, Soner Osman; Department of Civil Engineering (2004) Traditionally, the resilient modulus values obtained from repeated unconfined or triaxial compression tests are used as the elastic modulus of granular layers in structural analysis of flexible pavements. Sometimes the resilient modulus of granular materials are estimated from known California bearing ratios (CBR) or stabilometer resistance (R) values by simple regression equations. On the other hand, it is well known that stress-strain relation for unbound granular materials is nonlinear and the resilient ...
Analysis of tube upsetting Tüzün, Aydın; Darendeliler, Haluk; Department of Mechanical Engineering (2004) Producing axi-symmetrical parts with holes from tubular stock by tube upsetting is a frequently used technique in industry. There are basically four types of tube upsetting process; external, internal, simultaneous internal and external upsetting, and expanding of tube. In general, tubular parts require more than one upsetting stage. In industry, generally trial-error methods, which require lots of time and effort depending on experience, are used for the design of stages. Wrong design causes failures durin...

Citation Formats

M. İ. Gökler and H. Darendeliler, “Analysis of tapered preforms in cold upsetting,” INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE, pp. 1–16, 1999, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/53747.