柔性三维拉弯成形模具型面修正关键技术的研究  

Key Technologies Research on the Iterative Die-face Adjustment in the Forming Process of Flexible Three-dimensional Stretch-bending

作　　者：梁继才[1,2] 滕菲[1,2] 高嵩[1,2] 陈广义[1,2] 魏志勇[1,2] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,大连116024 [2]大连理工大学汽车工程学院,大连116024

出　　处：《机械工程学报》2013年第17期187-192,共6页Journal of Mechanical Engineering

基　　金：国家工信部技改专项资助项目(吉工信投资[2011]350)

摘　　要：针对高铁列车和汽车等结构件的特点和三维拉弯成形工艺要求,研究一种可重构的柔性拉弯成形模具,并提出一种通过迭代修正该模具型面从而达到精确成形的方法。采用离散的方法,将拉弯模具型面分为若干段,每段均作为成形模具的一个单元体。通过对单元体进行位移调整,以及旋转单元体上的成形滑块,可以重构模具型面。以复杂T型材为研究对象,对柔性拉弯模具三维拉弯和迭代修正模具型面的方法进行有限元仿真和试验验证。结果表明,设计的柔性模具和单元体位移及成形滑块的旋转角度计算方法能够对模具型面进行调整和补偿,迭代修正模具型面的方法可以有效地减少回弹,采用该方法的有限元模拟最大形状偏差值由2.43 mm减小到0.63 mm,试验验证的最大形状偏差值由6.87 mm减小到1.03 mm,该方法补偿精度高,可以达到三维拉弯精确成形。According to the requirements of three-dimensional stretch bending process and the characteristics of the structural parts of vehicles and high-speed trains,the design of the reconfigurable die for the process of stretch-bending forming is studied.And a new method to correct the shape considering springback compensation using iteratively adjust the die surface is proposed.The die surface is divided into several sections in a discrete way.Each section is treated as a unit body.By the displacement adjustment of the unit body and the rotation of the forming slider,the die-face can be reconstructed.The three-dimensional forming process with the flexible die and the method are verified by finite element simulation and experiment using the complex T-profile.It is confirmed that the calculation method of the rotation angle of forming slider and the displacement of unit body can effectively adjust and compensate on the die surface.The method of iteratively adjustment the die-face can effectively reduce the springback.The maximum deviation using iterative die-face adjustment in finite element simulation decreases form 2.43 mm to 0.63 mm,and the data in experiment decreases from 6.87 mm to 1.03 mm.It suggests that the method has high precision of compensation and can achieve three-dimensional bending precise forming.

关 键 词：柔性模具 迭代修正 三维拉弯 

分 类 号：TG386[金属学及工艺—金属压力加工]