Bolts and rivets are produced by cold forging technique. A great majority of metal
forming companies prefer to use their dexterity rather than science and
technology. The main aim of this thesis is to establish an environment for
developing technology in bolt production by reducing trial and error. In this thesis
finite element method is utilized to model bolt forming for correcting tooling
designs, removing production defects and estimating forging forces. Material
characterization, precise determination of boundary conditions and verification of
numerical results are also investigated. It is shown how efficient the finite element
method is for technology development in metal forming industry. Furthermore,
two anomalies in extrusion process are presented: The hump and the force hill in
extrusion force-displacement curve. Reasons of these two anomalies are studied
using finite element simulations and verified by experiments. Thesis also explains
reduction methods of three-dimensional problems to axisymmetric models and
compares the results.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/4/12605245/index.pdf |
| Date | 01 August 2004 |
| Creators | Onder, Canderim |
| Contributors | Tekkaya, Erman Ahmet |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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