Transactions of Materials and Heat Treatment

Title：Manufacturing process improvement of single seam welding pipe

Authors： LIN Xiang-nan

Unit： China Nonferrous Metal（Shenyang）Metallurgical Machinery Co. Ltd.

KeyWords： PFP gradual bending forming method single straight seam welded pipe bend radius of the neutral layer curvature

ClassificationCode：TG38

year,vol(issue):pagenumber：2013,38(5):96-98

Abstract：

Single seam welding pipe was formed by PFP gradual bending forming method adopting cold bending, which eliminates the heat treatment processes such as the blank heating plate with hot forging method and normalizing treatment after forging, and applies fixed upper die and lower die with adjustable width to reduce the number of die sinking and expand the scope of processing. The blank plate size of the unfolding circular tube was determined according to the tube diameter, wall thickness and bending radius of the neutral layer. Based on the equal curvatures around a circle, the factors including the arc length of each forming arc and the corresponding central angle of the arc etc. were determined. The full circle was split using CAD drawings，and the bending number and bending process were obtained by drawing bending line on the blank sheet. Steel plate in the bending machine was gradually bent. Finally, the qualified single seam welding pipe was obtained.

Funds：

林相楠（1982-），男，学士，助理工程师

Reference：

［1］徐天发，陈作炳，胡溧，等.C形管筒折弯成形预测模型研究 [J].中国机械工程，2004，15（15）：1392-1395.Xu T F,Chen Z B,Hu L, et al. Research on ANN-based model used to predict sheet forming process of C shaped tube[J]. China Mechanical Engineering, 2004，15（15）：1392-1395.
［2］JB/T 5000.3—1998重型机械通用技术条件焊接件[S].JB/T 5000.3—1998 The heavy mechanical general techniques and standards welding[S].
［3］GB 11345—89 钢焊缝手工超声波探伤方法和探伤结果分级[S].GB 11345—89 Method for manual ultrasonic testing and classification of testing results for ferritic steel welds[S].
［4］GB/T3091—2008 低压流体输送用焊接钢管[S].GB/T3091—2008 Welded steel pipes for low pressure liquid delivery[S].
［5］毛昕.新编钣金展开计算手册[M].沈阳：辽宁科学技术出版社，2004.Mao X. New Sheet Metal Unfolding Calculation Handbook[M]. Shenyang: Liaoning Science and Technology Press, 2004.
［6］安徽力源数控刃模具制造有限公司.开口可调式折弯机下模具：中国，201220055907[P]. 2012-09-19.Anhui Liyuan CNC Blade Mold Manufacturing Co., Ltd. Adjustable opening under bending machine mold: China, 201220055907[P]. 2012-09-19.
［7］韩英淳.简明冲压工艺与模具设计[M].上海：上海科学技术出版社，2006.Han Y C. Condensed Stamping Process and Die Design[M]. Shanghai: Shanghai Science and Technology Press, 2006.
［8］GB/T 1591—2008.中华人民共和国国家标准低合金高强度结构钢[S].GB/T 1591—2008 High strength low alloy structural steels[S].
［9］陆宏，黄文.高强度钢板V形弯曲板厚方向压缩对回弹的影响[J]. 锻压技术, 2011, 36(4): 56-58.Lu H, Huang W. Effect of thickness direction compression on springback of high strength V-shape sheet[J]. Forging & Stamping Technology, 2011,36(4): 56-58.

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