Curvature and Residual Stress Analysis in Rotational Leveling of Bars

• Published in: Journal of iron and steel research, international Vol. 23; no. 7; pp. 669 - 676
• Main Authors: WANG, Yong-qin, LIU, Zhi-fang, OU, Hen-gan, LUO, Yuan-xin, YAN, Xing-chun
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.07.2016; Springer Singapore
• Subjects: Applied and Technical Physics; bar; curvature; Engineering; Machines; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; Metallurgy and Metal Working; Physical Chemistry; Processes; residual stress; rotational leveling process; trajectory; 产品标准; 仿真结果; 旋转运动; 曲率; 材料性能; 棒材; 残余应力分析; 矫平; rotational leveling process; residual stress; bar; trajectory; curvature
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(16)30104-2

Leveling process plays an important role in delivering the desired material properties and product standards.An analytical method for the rotational leveling process of bars was presented.First,each cross section of the bar in the leveling area was discretized with the roller gap-curvature relations established in both planes XYand XZ.Second,a numerical procedure with two steps was developed to simulate both pressing and leveling processes.This approach can be easily implemented to produce simulation results of the curvature and trajectory distributions during the leveling process,as well as the bending and residual stresses.It is found that curvature and trajectory distributions follow a sine-shape due to the characteristic of rotational movement,which also results in a helical pattern of residual stress after leveling.Based on the results obtained,it is also observed that the rotational movement is beneficial for adding the number of bending cycle.This is the reason why there are only a few pairs of rollers on the bar leveler.