钛合金薄壁弯管热气胀工艺变形行为  

Deformation behavior of titanium alloy thin-walled bent tube during hot gas bulging process

作　　者：付坤宁 杨小克 杨波 郑凯伦 Fu Kunning;Yang Xiaoke;Yang Bo;Zheng Kailun(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Aerospace Hiwing(Harbin)Titanium Industry Co.,Ltd.,The Third Academy of China CASIC,Harbin 150000,China;Shenyang Liming Aero-engine Co.,Ltd.AECC,Shenyang 110043,China;School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001 [2]中国航天科工三院航天海鹰(哈尔滨)钛业有限公司,黑龙江哈尔滨150000 [3]中国航发沈阳黎明航空发动机有限责任公司,辽宁沈阳110043 [4]大连理工大学机械工程学院,辽宁大连116024

出　　处：《锻压技术》2023年第5期123-129,共7页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(5200052525)。

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@206 mmx1.5 mmxR495 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.

关 键 词：钛合金管材 热气胀成形 应变硬化 应变速率硬化 变形均匀性 

分 类 号：TG394[金属学及工艺—金属压力加工]