Vol. 16, No. 2, pp. 181-190 (2020)
EFFECT OF DIFFERENT ROLL FORMING PROCESSES ON MATERIAL
PROPERTIES OF SQUARE TUBES
Fei Han *, Yun Wang, Tao Zhang, Qian Li and Yu Song
School of Mechancial and Materials Engineeing, North China University of Technology, Beijing, 100144, China
* (Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 13 January 2020; Revised: 26 April 2020; Accepted: 30 April 2020
DOI:10.18057/IJASC.2020.16.2.9
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ABSTRACT
Different roll forming processes result in parts with different properties. This study compared the behavior of square tubes manufactured using two different processes, namely continuous and direct forming process, and then examined the yield strength, ultimate strength, residual stress, and metallography in different regions. Furthermore, finite element models of direct and continuous forming were developed, and the results obtained using these models agreed well with the experimental results. The yield and ultimate strengths of each part of the continuously formed square tube were higher than those of the directly formed square tube. The residual stress showed that different processes considerably affected the longitudinal residual stress but had a less significant effect on the horizontal residual stress. The residual stress due to continuous forming was higher than that due to direct forming. Microscopic tests showed that the weld seam of the continuously formed square tube exhibited greater plasticity and anti-impact toughness than that of the directly formed square tube. This study can serve as a guide to practical production and suitable process selection.
KEYWORDS
Roll forming, Material property, Residual stress, Metallography
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