薄壁多层不锈钢波纹管整体成形工艺  

Integral forming technology of thin-walled multiply stainless steel bellows

作　　者：简翰鸣 赵淘 卜星 王业伟[1] 王紫旻 Jian Hanming;Zhao Tao;Bu Xing;Wang Yewei;Wang Zimin(Shanghai Spacelight Precision Machinery Institute,Shanghai 201600,China)

机构地区：[1]上海航天精密机械研究所,上海201600

出　　处：《锻压技术》2021年第4期81-88,111,共9页Forging & Stamping Technology

摘　　要：对运载火箭增压输送系统的薄壁多层不锈钢波纹管的成形工艺进行分析,通过精密卷板焊接、整体液压成形等方式,实现了薄壁多层波纹管的高精度制造。通过工艺试验,确定了0.4 mm的1Cr18Ni9Ti不锈钢的纵缝焊接参数:当焊接电流为40 A、焊接速度约为50 mm·s-1时,可使焊缝较好地成形,外观及内部质量达到QJ 1165A—2001中的Ⅰ级要求;同时,确定了纵缝焊接时管坯起弧点对接边间隙的尺寸范围,当起弧点对接边间隙小于0.04 mm时,方可顺利起弧。另外,根据试验确定了目标多层波纹管产品的整体液压成形工艺路径及参数取值,当胀形压力为15~16 MPa、成形压力为13~15 MPa时,成形出的目标3层波纹管层间紧密贴合、无间隙。Based on the forming process analysis of thin-walled multiply stainless steel bellows used in pressurization and transport system of carrier rockets,the high precision manufacturing of thin-walled multiply bellows was realized by precise coil welding and integral hydroforming.Then,the parameters of longitudinal seam welding for 0.4 mm 1Cr18Ni9Ti stainless steel were found by process experiments.When the welding current was 40 A and the welding speed was about 50 mm·s-1,the welding seam was formed better,and its appearance and internal quality reached the requirements of class I in QJ 1165 A-2001.At the same time,the clearance range of mating edges for arc starting point of tube blank was determined during longitudinal seam welding,and when the clearance of mating edges for arc starting point was less than 0.04 mm,the arc was started smoothly.In addition,the process paths and parameters of integral hydroforming for target multiply bellows were determined by the tests.Finally,when the bulging pressure was 15-16 MPa and the forming pressure was 13-15 MPa,the target three-layer bellows was tightly fitted without clearance between layers.

关 键 词：多层波纹管 薄壁不锈钢 纵缝焊接 高精度 液压成形 

分 类 号：TG394[金属学及工艺—金属压力加工]