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http://dx.doi.org/10.9726/kspse.2017.21.2.041

Study of a Forging Process for the Application of Boron Steel for Automotive Wheel Nut Material  

Lee, Kwon-Soo (Department of Materials Sci. & Eng. Pukyong National University)
Ahn, Yong-Sik (Department of Materials Sci. & Eng. Pukyong National University)
Publication Information
Journal of Power System Engineering / v.21, no.2, 2017 , pp. 41-47 More about this Journal
Abstract
Boron steel (51B20) was cold forged using by new designed dies to apply for automotive aluminum wheel nut. The formability and mechanical properties of boron steel were compared with carbon steel(S45C) which has been used up to date for the wheel nut material. The formability was investigated on the dies designed with various types of punch nose using by FEM. The metal flow and compressive stress on the dies during cold forging were investigated and compared each other. The forging process with a new designed die showed the improved metal flow with a reduced forging load which resulted in the significant increase of the die life. It was recommended that the carbon steel for automotive wheel nut material could be substituted by the boron steel.
Keywords
Cold forging; Die design; Boron steel; Tooling life;
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