铝型材三维拉弯工艺  

Three-dimensional stretch-bending process for aluminum profile

作　　者：崔广磊 李超 沈盛军 于洪兵[1] Cui Guanglei;Li Chao;Shen Shengjun;Yu Hongbing(Department of Vehicle Engineering,Baotou Vocational and Technical College,Baotou 014030,China)

机构地区：[1]包头职业技术学院车辆工程系,内蒙古包头014030

出　　处：《锻压技术》2022年第2期78-82,共5页Forging & Stamping Technology

基　　金：内蒙古自治区高等学校科学研究项目(NJZY21101)。

摘　　要：由于铝型材三维拉弯夹头的运动轨迹一般为空间曲线,且铝型材在拉弯过程中有拉伸变形,其拉弯夹头的运动轨迹很难获取,为此,提出一种确定铝型材三维拉弯夹头运动轨迹的方法。首先,将初始的铝型材两端分为固定端和夹持端,并在固定端建立坐标系;其次,提取产品的中心轴线,将其离散化成若干个空间点,以每一个离散点为切点,做产品中心轴线的切线;沿每一条切线方向截取相应长度的线段(从切点到夹持端),线段另一端点即为夹头运动轨迹经过的空间点,将这些点依次连接便可得到夹头的运动轨迹;最后,通过实例对提出的方法进行验证。结果表明:在一定范围内,随着离散点数量的增加,回弹值迅速减小,而后随着离散点继续增加,回弹值变化不大;在分析时将中间部位作为回弹参考基准,得到的回弹值与实际结果更为接近。Since the motion trajectory of three-dimensional stretch-bending chuck for aluminum profile is generally a space curve, the aluminum profile is stretched and deformed during the stretch-bending process, and the motion trajectory of stretch-bending chuck is difficult to obtain. Therefore, a method for determining the motion trajectory of three-dimensional stretch-bending chuck for aluminum profile was proposed. Firstly, the two ends of inital aluminum profile were divided into fixed end and clamping end, and the coordinate system was established at the fixed end. Secondly, the central axis of product was extracted to discretize into several space points, and each discrete point was taken as the tangent point to make the tangent line of product central axis. Furthermore, the line segment of corresponding length was intercepted along each tangent direction(from the tangent point to the clamping end), the other end of the line segment was the space points through which the chuck motion trajectory passes, and by connecting these points in turn the trajectory of chuck was obtained. Finally, an example was given to verify the proposed method. The results show that within a certain range, with the increasing of the number of discrete points, the springback value decreases rapidly, and then as the number of discrete points continues to increase, the springback value changes little. In the analysis, the middle part is taken as the springback reference standard, and the springback value obtained is closer to the actual result.

关 键 词：铝型材 三维拉弯 夹头 运动轨迹 回弹 

分 类 号：TG386.1[金属学及工艺—金属压力加工]