基于响应曲面法的激光辅助机器人双点滚压成形回弹控制  

Springback control of laser⁃assisted double⁃sided robotic roller forming based on response surface method

作　　者：汪锦成 刘亿 闵峻英[1] WANG Jin-cheng;LIU Yi;MIN Jun-ying(School of Mechanical Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学机械与能源工程学院,上海201804

出　　处：《塑性工程学报》2023年第6期222-230,共9页Journal of Plasticity Engineering

基　　金：上海市“科技创新行动计划”项目(21170711200)。

摘　　要：针对超高强钢难成形的问题,提出了激光辅助机器人双点滚压成形工艺。以弯曲为例,研究了激光功率密度对弯曲零件回弹的影响,并基于响应曲面法,以回弹角度为目标函数,成形载荷为约束条件优化了角度增量和工业机器人位移补偿参数。结果表明,超高强钢零件回弹角度随着激光功率密度的增大而减小,激光功率密度为125 W·mm^(-2)时零件回弹角度相较于常温成形减小了78.5%,但回弹减小趋势随着激光功率密度继续增大趋于平缓;将激光功率密度固定为125 W·mm^(-2),进一步通过响应曲面法将成形过程载荷控制在600~900 N范围内,得到了优化的4道次角度增量和两滚轮位移补偿值,相较于优化前的4道次成形策略,弯曲零件的回弹角度从6.0°降低到接近于0°。响应曲面法可用于优化机器人双点滚压成形工艺参数,从而显著降低滚压成形零件的回弹并且提高成形效率。A laser⁃assisted double⁃sided robotic roller forming process was proposed to solve the forming difficulty of ultrahigh strength steel.Taking bending as an example,the effect of laser power density on springback of bending parts was studied,and the angle incre⁃ment and the displacement compensation parameters of industrial robot were optimized based on response surface method with the spring⁃back angle as the objective function and the forming load as the constraint condition.The results show that the springback angles of ultra⁃high strength steel parts decrease with the increase of laser power density.The springback angle is decreased by 78.5%with laser power density of 125 W·mm^(-2)in comparison with forming at room temperature,but reduction trend of springback is less obvious at a power density over 125 W·mm^(-2).On the basis of laser power density of 125 W·mm^(-2),the four⁃pass angle increment and displacement com⁃pensation of the two rollers are optimized by reponse surface method with load constraint in the range of 600-900 N.Compared with the four⁃pass forming strategy before optimization,the springback angle of bending part is reduced from 6.0°to almost 0°.Response surface method can be used to optimize the process parameters of robotic double⁃sided roller forming to reduce the springback of formed parts sig⁃nificantly and improve the forming efficiency.

关 键 词：机器人成形 激光辅助成形 响应曲面法 柔性成形 回弹 

分 类 号：TG306[金属学及工艺—金属压力加工]