锻压技术

带长直段小弯曲半径管可控内压推弯研究

英文标题：Research on controllable internal pressure push bending for tube with long straight section and small bending radius

作者：徐勇1 2 贺腾飞1 解文龙2 张士宏2 黄新越3 王晟诚3

单位：1. 华北理工大学冶金与能源学院 2. 中国科学院金属研究所师昌绪先进材料创新中心 3. 沈阳多元机电设备有限公司

关键词：聚氨酯小弯曲半径推弯可控内压反推力

分类号：TG376

出版年,卷(期):页码：2023,48(5):87-94

摘要：

针对带长直段小弯曲半径管在推弯成形时极易产生的失稳起皱和横截面畸变等缺陷，采用聚氨酯内胀冷推弯成形了规格为Φ25 mm×1 mm、弯曲半径为1D的5B02铝合金管材，并采用有限元模拟研究了推弯过程中聚氨酯内压力分布。通过分析反推力、聚氨酯参数、内摩擦获取了聚氨酯内压力分布情况，确定了内压力与缺陷之间的关系，实现了可控内压。研究结果表明:当反推力增大至13 MPa时，管材成形不足; 反推力减小为5 MPa时，支撑弯管的内压力不足，弯管产生失稳塌陷与端口畸变。当聚氨酯硬度不足时，会加剧弯管横截面畸变。聚氨酯与管之间的摩擦因数的改变会影响聚氨酯所提供的内压力，摩擦因数小时会导致成形不足从而引起管材失稳起皱。通过以上研究验证了可控内压推弯的可行性。

In view of the defects such as instability, wrinkling and cross-sectional distortion that were easily produced during push-bending of tubes with long straight section and small bending radius, 5B02 aluminum alloy tubes with the specification of Φ25 mm×1 mm and the bending radius of 1D were formed by internal expansion and cold push-bending process with polyurethane filler, and the internal pressure distribution of polyurethane filler during the push-bending process was studied by finite element simulation. Then, by analyzing reverse thrust, polyurethane filler parameters and internal friction, the internal pressure distribution of polyurethane filler was obtained, and the relationship between internal pressure and defects was determined to realize the controllable internal pressure. The research results show that when the reverse thrust is increased to 13 MPa, the tube is not well formed. When the reverse thrust is reduced to 5 MPa, the internal pressure of supporting elbow is insufficient, resulting in instability and port distortion of elbow. When the hardness of polyurethane filler is insufficient, the cross-sectional distortion of elbow is aggravated. The change of friction coefficient between polyurethane filler and tube affects the internal pressure provided by the polyurethane filler, and when the friction coefficient is small, it leads to insufficient forming and causes instability and wrinkle of tube. Thus, the feasibility of controllable internal pressure push bending is verified by the above study.

基金项目：

沈阳市科技计划项目（22-301-1-10）；中国科学院青年创新促进会专项（2019195）

作者简介：徐勇(1983-)，男，博士，研究员，E-mail：yxu@imr.ac.cn

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