锻压技术

钛合金薄壁弯管热气胀工艺变形行为

英文标题：Deformation behavior of titanium alloy thin-walled bent tube during hot gas bulging process

单位：1.哈尔滨工业大学材料科学与工程学院 2.中国航天科工三院航天海鹰（哈尔滨）钛业有限公司 3.中国航发沈阳黎明航空发动机有限责任公司 4.大连理工大学机械工程学院

分类号：TG394

出版年,卷(期):页码：2023,48(5):123-129

摘要：

针对TC4钛合金薄壁弯管弯曲过程中的内侧起皱、外侧开裂、横截面畸变和弯曲回弹等成形缺陷，提出了钛合金薄壁弯管热气胀成形工艺，解决了以上成形缺陷，并通过调控工艺参数控制TC4钛合金的应变硬化与应变速率硬化的协同作用，提升了薄壁弯管的壁厚均匀性。在此基础上，开展了TC4钛合金薄壁弯管的热气胀成形实验。最终成形出满足产品使用要求的Φ206 mm×1.5 mm×R495 mm的TC4钛合金薄壁弯管，最大不圆度仅为0.25%，最大减薄率为16.88%。结果表明：在TC4钛合金薄壁弯管热气胀成形过程中，控制成形温度及应变速率等主要工艺参数，可以提高薄壁弯管的成形精度和壁厚均匀性，显著改善成形弯管的产品质量。

For the forming defects of inner wrinkling, outer cracking, sectional distortion and bending springback of TC4 titanium alloy thin-walled bent tube during bending process, the hot gas bulging process of titanium alloy thin-walled bent tube was proposed and the above forming defects were solved. The wall thickness uniformity of thin-walled bent tube was improved by adjusting the process parameters to control the cooperative regulation of strain and strain rate hardening for TC4 titanium alloy. Based on the above theory, the hot gas bulging experiment of TC4 titanium alloy thin-walled bent tube was carried out. Finally, the TC4 titanium alloy thin-walled bent tube of Φ206 mm×1.5 mm×R495 mm which met the product use requirements was formed with the maximum out-of-roundness of 0.25% and the maximum thinning rate of 16.88%. The results show that during the hot gas bulging process of TC4 titanium alloy thin-walled bent tube, the forming accuracy and wall thickness uniformity of thin-walled bent tube can be improved by controlling the main process parameters such as forming temperature and strain rate to significantly improve the product quality of formed bent tube.

基金项目：

国家自然科学基金资助项目（5200052525）

作者简介：付坤宁（1991-），男，博士研究生,E-mail：19b909110@stu.hit.edu.cn;通信作者：郑凯伦（1988-），男，博士，教授,E-mail：zhengkailun@dlut.edu.cn

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