结构尺寸对316L矩形波纹管液压胀形的影响  

Effect of Geometry on Hydroforming of 316L Rectangular Bellow

作　　者：陈立强 刘静[1,2] 刘健 李兰云[1,2] 葛前[3] 左星煜 CHEN Li-qiang;LIU Jing;LIU Jian;LI Lan-yun;GE Qian;ZUO Xing-yu(School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Key Laboratory of Materials Processing Engineering,Xi'an Shiyou University,Xi'an 710065,China;Xi'an Hengre Thermal Technology Co.,Ltd.,Xi'an 710016,China)

机构地区：[1]西安石油大学材料科学与工程学院,西安710065 [2]西安石油大学材料加工工程重点实验室,西安710065 [3]西安恒热热力技术有限责任公司,西安710016

出　　处：《精密成形工程》2023年第4期99-111,共13页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51875456);陕西省教育厅服务地方专项项目(20JC029);陕西省高性能精确成形技术与装备重点实验室项目(PETE-2020-KF-02);西安石油大学研究生创新与实践项目(YCS21212128)。

摘　　要：目的掌握结构尺寸对矩形波纹管液压胀形的影响规律。方法利用有限元平台Abaqus/Explicit建立316L矩形波纹管的三维有限元模型,对其液压胀形过程进行数值模拟分析,并利用实验验证有限元模型的正确性,基于单因素法研究长宽比、过渡圆角半径及波距对矩形波纹管成形质量的影响。结果综合考虑成形波高、壁厚减薄率及周向轮廓3个指标,获得了长宽比、过渡圆角半径和波距对波纹管成形的影响规律,并给出了各参数对不同指标影响的显著性。结论随着长宽比的增大,长边壁厚减薄率明显减小,圆角与短边的壁厚变化不大,并且不同长宽比波纹管的成形轮廓均在圆角段上低于设计值,在直线段上高于设计值;增大过渡圆角半径更有利于圆角段的贴合,且有利于降低周向壁厚减薄率;波距对波纹管的壁厚减薄率影响显著,波距较小时,波峰上有明显的增厚现象,随着波距的增大,波峰上的增厚现象逐渐消失并开始减薄,波纹管周向波高增大,直边波高容易超出公差范围,可以通过降低成形内压或减小模片间距将波高修正到公差范围内,获得合格的波纹管产品。The work aims to obtain the effect law of geometry on the hydroforming of rectangular bellow.The 3D finite element model of 316L rectangular bellow was established by the finite element platform Abaqus/Explicit.The hydroforming process was numerically simulated and analyzed and the correctness of the finite element model was verified by experiments.The effects of geometric parameters,including the aspect ratio,transition fillet radius and convolution width,on the results of the formed bellow were studied based on the single factor method.In overall consideration of three indexes of convolution height,wall thinning degree and circumferential profile,the effect law of the geometric parameters on forming of bellow and the significance level of effect on different indexes were revealed.The wall thinning degree decreases dramatically at the long straight segment but changes slightly at the fillet segment and short straight segment with increasing aspect ratio.The forming profile of bellows with different aspect ratios is lower than the design value in the fillet segment and higher than the design value in the straight segment.Increasing the radius of transition fillet is more beneficial to the fitting of fillet segment and the reduction of circumferential wall thinning degree.Convolution width has dramatic impact on wall thinning degree.A prominent material thickening on the crests is observed with small convolution width.With increasing convolution width,the thickening on the crests is gradually disappeared and the thinning on the crests is found accompanied by an increase in convolution height.The dimensions of convolution heights at the straight segment easily exceed the tolerance range,which can be corrected by reducing the internal pressure or the die spacing in order to obtain the qualified bellow products.

关 键 词：矩形波纹管 液压胀形 结构尺寸 影响规律 有限元模型 

分 类 号：TG394[金属学及工艺—金属压力加工]