锻压技术

管坯结构对小半径薄壁弯头内胀冷推弯成形的影响

英文标题：Influence of tube blank structure on inner bulging and cold push-bending for thin-wall elbow with small radius

作者：付春林王宛山徐雪峰

单位：东北大学南昌航空大学

分类号：TG376

出版年,卷(期):页码：2019,44(1):80-85

摘要：

针对Ф40 mm×1 mm铝合金管材且弯曲半径为1倍管径的L形弯管成形，以数值模拟技术为平台，建立了内胀冷推弯有限元模型，研究了管坯端头不同补偿角度对弯管成形质量的影响。结果表明：补偿角度过大时，弯管内侧易产生压缩起皱，降低补偿角度则能有效防止弯管产生压缩起皱，且随着角度的降低，成形弯管减薄区域不断扩大，同时弯管弯曲内侧有效长度不断降低，易造成成形不足；补偿角度为45°时，起皱现象消失，外侧壁厚最大减薄率为7.1%，整体成形质量较佳。以45°补偿角度进行内胀冷推弯试验，成形出符合要求的1倍弯曲半径弯管，且试验结果与模拟结果整体较吻合。

For the forming of Φ40 mm×1 mm aluminum alloy L-shape bending tube which the bending radius is one times the tube diameter, based on the numerical simulation software, the finite element model of inner bulging and cold push-bending was established, and the influences of different compensation angles of blank ends on the tube forming quality were studied. The results show that the wrinkling in the inner side of bending tube can be easily produced when the compensation angle is oversize，and a smaller compensation angle can effectively prevent the bending tube from producing wrinkles. Furthermore, with the decreasing of angle, the thinning area of the formed tube continues to expand, and the effective length of the inner side of bending tube is continuously reduced to cause insufficient forming easily. However, the wrinkling disappears when the compensation angle is 45°，the maximum reduction ratio of the outer wall thickness is 7.1%，and the overall forming quality is better. Finally, the inner bulging and cold push-bending experiment was conducted based on the 45°compensation of angle， and the tubes with bending radius of one times the tube diameter that met the requirements were formed. The experiment results is coincident with the simulated results.

基金项目：

国家自然科学基金资助项目（51405219）；中航工业产学研项目（BA201306321）

付春林(1974-),男，博士研究生，讲师，E-mail：forestneu@126.com；通作作者：王宛山（1946-），男，硕士，教授，博士生导师，E-mail：wws@neu.edu.cn

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