Diameter Expansion Deformation Behaviors of Midair Shaft under Various Processing Conditions

Abstract:

The basic investigation was conducted for the diameter enlarging machine of a shaft by repeating cyclic torsion newly developed as a novel idea. With a concept repeating the alternate cyclic stress on a shaft subjected to axial-compressive force, the plastic working method to cause diameter enlarging deformation on a part of shaft was proposed. In this investigation, the diameter enlarging experiment and the model analysis by FEM with notice of the deformation behaviors on diameter enlarging process were conducted as axial-compressive stress σc and torsion angle θ for mild steel pipes of SGD400. About 300cycles of cyclic torsion was repeated the cyclic torsion angle θ=3°as a standard process condition to a shaft subjected to axial-compressive stress of σC/σy0 =1.0. In this condition, the shaft has enlarged to about 1.3 times of initial diameter (D/D0=1.3). The experimental value was in excellent agreement with the analysis value. Also, not only diameter enlarging deformation behaviors but also influence of machining conditions on the behaviors was clarified.

• Periodical: Key Engineering Materials (Volumes 345-346)
• Pages: 1093-1096
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.345-346.1093
• Online since: August 2007
• Authors: Kengo Fujiki, Xia Zhu, Kazuki Mori, Nagatoshi Okabe
• Keywords: Axial-Compressive Stress, Deformation, Diameter Enlarging Rate, Torsion Angle

References

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[5] Yoshida, F. : Elastic-plastic fourdation, (1997), KYORITSU PUB. CO., LTD., pp.114-117, 150-169. Fig. 8 Relation between diameter enlarging and axial-compressive applied to the only initial diameter part B-type A-type.

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[1] 7 0 50 100 150 200 Number of torsion cycles N Diameter enlarging rate D/D0 θ=0° θ=1° θ=2° θ=3° θ=4° θ=5° θ=6° Analysis result Fig. 6 Effect of parameters on deformation behaviors obtained results from the analysis (a) Effect of axial-compressive stress � = 3r 1.

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[1] 7 0 50 100 150 200 Number of torsional cycles N Diameter enlarging rate D/D0 σc/σy0=0. 8 σc/σy0=1. 0 σc/σy0=1. 2 σc/σy0=1. 4 Analysis result (b) Effect of torsion angle (a) A-type Fig. 7 Dies models to consider effect of axial-compressive stress from dies to a shaft (b) B-type.