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Mathematical Problems in Engineering
Volume 2015, Article ID 835038, 11 pages
Research Article

Fabrication Improvement of Cold Forging Hexagonal Nuts by Computational Analysis and Experiment Verification

1Department of Mechanical & Automation Engineering, Kao-Yuan University, Kaohsiung City 821, Taiwan
2Department of Applied Geoinformatics, Chia Nan University of Pharmacy & Science, Tainan City 717, Taiwan

Received 15 June 2014; Accepted 6 August 2014

Academic Editor: Teen-Hang Meen

Copyright © 2015 Shao-Yi Hsia and Yu-Tuan Chou. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Cold forging has played a critical role in fasteners and has been applied to the automobile industry, construction industry, aerospace industry, and living products so that cold forging presents the opportunities for manufacturing more products. By using computer simulation, this study attempts to analyze the process of creating machine parts, such as hexagonal nuts. The DEFORM-3D forming software is applied to analyze the process at various stages in the computer simulation, and the compression test is also used for the flow stress equation in order to compare the differences between the experimental results and the equation that is built into the computer simulation software. At the same time, the metallography and hardness of experiments are utilized to understand the cold forging characteristics of hexagonal nuts. The research results would benefit machinery businesses to realize the forging load and forming conditions at various stages before the fastener formation. In addition to planning proper die design and production, the quality of the produced hexagonal nuts would be more stable to promote industrial competitiveness.