Transactions of Materials and Heat Treatment

Title：Design on composite mold for coiled JCOE forming welded pipe

Authors： Liu Qingcai1 2

Unit： 1.College of Electromechanical Engineering Guangzhou Railway Polytechnic 2.R&D Center Panyu Chu Kong Steel Pipe Group Co. Ltd.

KeyWords： longitudinal submerged arc welded pipe composite mold JCOE forming welded pipe work hardening pre-bending force

ClassificationCode：TG305

year,vol(issue):pagenumber：2024,49(10):184-188

Abstract：

For the process problems of steel plate sliding, without pre-bending of plate edge, difficulty in entering the jaws due to steel plate deformation and unreasonable dimensions of forming core shaft in the forming process of coiled JCOE forming welded pipes, a composite mold of pre-bending and forming for plate edge was studied and designed，and using the elastic-plastic deformation theory of steel plate bending, a calculation method for pre-bending force and composite mold parameters was proposed. Then, the influence of work hardening on the steel pipe forming process was further considered, and combined with the hardening index provided in relevant literature, the performance parameter B value of pipeline steel grades from X42 to X70 was calculated, and the mold parameter calculation method considering work hardening was obtained. Furthermore, the pre-bending force and mold parameters of steel pipes with different yield strength grades and specifications were obtained by two kinds of methods, and compared with the mold parameters of actual process. The results indicate that without considering work hardening, the maximum deviation between the calculated results and the actual mold sizes is 1.1%. Under the condition of considering work hardening, the maximum deviation between the calculation results and the actual mold sizes is -0.9%, and all calculated results are slightly smaller than the mold parameters of actual process. Thus, considering the actual production situation, the calculation results of mold parameters considering work hardening are more accurate.

Funds：

广东省高校科技创新项目（2019GKTSCX077）

作者简介：刘庆才（1969-），男，博士，高级工程师，教授,E-mail：807431278@qq.com

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