异形波纹板激光弯曲成形面畸变抑制策略研究  

Research on Suppression Strategy of Plane Distortion in Laser Bending Forming of Specialty⁃Shaped Corrugated Sheet

作　　者：姚喆赫 洪锦源 范伟鑫 刘云峰[2,3] 梅德庆 姚建华[1,2,3] Yao Zhehe;Hong Jinyuan;Fan Weixin;Liu Yunfeng;Mei Deqing;Yao Jianhua(Institute of Laser Advanced Manufacturing,Zhejiang University of Technology,Hangzhou 310023,Zhejiang,China;College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,Zhejiang,China;Collaborative Innovation Center of High-end Laser Manufacturing Equipment,Hangzhou 310023,Zhejiang,China;State Key Laboratory of Fluid Power and Mechatronic Systems,Zhejiang University,Hangzhou 310027,Zhejiang,China)

机构地区：[1]浙江工业大学激光先进制造研究院,浙江杭州310023 [2]浙江工业大学机械工程学院,浙江杭州310023 [3]高端激光制造装备省部共建协同创新中心,浙江杭州310023 [4]浙江大学流体动力与机电系统国家重点实验室,浙江杭州310027

出　　处：《中国激光》2023年第20期48-58,共11页Chinese Journal of Lasers

基　　金：国家自然科学基金(U1809220,52175443);浙江省自然科学基金(LD22E050013)。

摘　　要：面向甲醇重整制氢微反应器异形微细波纹板制造难题,采用激光弯曲成形技术制造了“双圆弧”异形微细波纹板。针对“双圆弧”异形波纹板激光弯曲成形过程中的面畸变缺陷,提出了一种变速扫描策略,在不同扫描策略下开展了温度场数值模拟与成形试验研究,并对有无抑制策略下的异形波纹板成形质量进行了评价。结果表明,多段变速策略实现了能量分布的离散化调控,末端热积累显著降低,8段变速时出口处峰值温度相较于恒速扫描下降了13.4%;在变速扫描策略下,法平面弯曲成形面畸变呈减小趋势,弯曲角度差小于1.0°,成形后波纹板流道上下底面的平行度提高了87.5%,波纹度最大降低了51.2%。研究结果表明,变速扫描策略可显著降低激光弯曲成形面畸变,提升波纹板成形质量。Objective The miniaturization and customization of corrugated sheets have become development trends to meet the demand of the high-efficiency heat and mass transfer in methanol reforming microreactors.To avoid problems such as springback,cracking,and wrinkling caused by conventional metal-forming processes,laser-forming technology becomes a potential solution to manufacture such structural components.However,when laser forming is adopted to fabricate specialty-shaped microcorrugated sheets,the sheets are prone to plane distortion defects owing to the uneven distribution of the energy input and free-end constraint in the curved scanning process.The plane distortion may lead to a gap between the corrugated sheets in the microreactor assembly,resulting in fluid leakage and a significant reduction in the heat and mass transfer performance of the microreactor.Because studies focusing on the laser forming of specialty-shaped microcorrugated sheets remain limited,the heat accumulation in laser scanning and the relationship between the temperature field and bending angle with various scanning strategies are analyzed in this study based on numerical simulations and experimental studies.A segmented variable-velocity strategy is explored to suppress the plane distortion.The forming quality of the corrugated sheets is further evaluated.This study provides a reference for the analysis and suppression of the plane distortion in the laser forming of specialty-shaped components.Methods The heat accumulation and temperature field distribution during the laser scanning along a double-arc curve are studied via numerical simulation,and the temperature difference between the top and bottom surface on the scanning path is analyzed using a segmented variable-velocity strategy.An experimental setup for the laser forming of a specialty-shaped corrugated sheet is developed(Fig.6).The material of the specimen used in the experiments is 304 stainless steel with the size of 65.0 mm×65.0 mm×0.2 mm.A 1.5 kW oscillator continuous fiber laser

关 键 词：激光技术 激光弯曲成形 异形波纹板 面畸变 抑制策略 

分 类 号：TN249[电子电信—物理电子学]