Mechanical Analysis and Verification Research on Asymmetric Four-Point Bending for the JCO Forming Process of LSAW Pipes
Zhiyuan Zhang, Yi Liu, Zhiwen Lu, Junfang Shen, Yan Gao, Yize Chen
TL;DR
This paper introduces an asymmetric bending method to improve the efficiency and quality of large-diameter pipe forming.
Contribution
The novel asymmetric four-point air bending process reduces pipe ovality and improves forming efficiency in LSAW pipe production.
Findings
The AFB process achieved an ellipticity of less than 0.66%, significantly lower than symmetric methods.
Experimental and simulation results showed minimal error and consistent trends with theoretical predictions.
The AFB process improves both forming quality and production efficiency for LSAW pipes.
Abstract
Large-diameter longitudinal submerged arc welded (LSAW) pipes represent a critical component of long-distance oil and gas transmission pipelines. To enhance the forming efficiency of the JCO (J-shape to C-shape to O-shape) forming process for LSAW pipes, and to reduce residual straight segment in order to minimize the ovality of the formed pipes, an asymmetric four-point air bending (AFB) process was proposed. In this process, one end of the sheet contacts the dies with a straight segment, while the other end contacts a circular arc segment. The distribution of bending moments and mechanical model under different bending stages were analyzed, and analytical formulas for the main forming indexes before and after springback were derived. Experimental and finite element simulation verification were conducted for the AFB process. The results indicated that the error between the experimental…
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Taxonomy
TopicsStructural Integrity and Reliability Analysis · Metal Forming Simulation Techniques · Drilling and Well Engineering