激光拼焊板焊缝线位置反求优化方法研究

发布时间：2017-12-27 06:26

本文关键词：激光拼焊板焊缝线位置反求优化方法研究　出处：《湖南大学》2016年硕士论文　论文类型：学位论文

【摘要】：拼焊板因其自身特性在成形过程中焊缝线不可避免地会发生漂移从而引起焊缝线设计位置与实际位置的偏差,焊缝线偏差会影响板料拼焊板成形性,材料分布,模具表面磨损,薄侧材料收缩起皱等。现阶段对焊缝线偏差的控制主要依赖工艺方案和工艺参数的调整措施,效果有限且有时会影响板料整体成形质量。本文针对拼焊板成形过程焊缝线漂移所导致的成形质量及焊缝线位置偏差等问题进行深入研究,以达到提高焊缝线位置精度、改善板料整体成形质量的目的,主要进行了以下工作:基于网格映射原理反求激光拼焊板焊缝线,合理布置焊缝线初始位置,适当调整工艺参数来控制焊缝线位置精度及整体成形质量,并通过仿汽车门内板模型进行仿真及实物实验验证。结果表明,通过直接反求激光拼焊板焊缝线位置的方法,可以明显提高焊缝线位置精度,改善整体成形质量,以仿汽车门内板模型进行仿真分析及实物实验结果精度较高,验证本方法的科学性。以此方法确定激光拼焊板焊缝线位置可以应用于生产过程,为指导生产具有实际意义。基于网格映射和均匀拉丁方试验方法、遗传算法提出一种对激光拼焊板板料焊缝线位置进行优化的方法。网格映射法确定焊缝线各端点极限位置,从而可得焊缝线端点初始位置。优化目标为板料焊缝线最大位置偏差的最小值,约束条件为整体板料的不发生起皱和开裂。结合仿汽车门内板模型实例分析结果表明,采用优化方法后的板料进行冲压成形,可以明显提高焊缝线位置精度,改善整体成形质量;实物验证优化方法。此方法从另一种思路反求焊缝线来控制焊缝线位置精度,同时也证明直接反求方法的可行性。
[Abstract]:TWBs due to its own characteristics in the forming process of weld line will inevitably drift caused by deviation weld line design position and actual position of the weld line deviation will affect the Sheet Formability of TWBs, material distribution, mold surface wear, thin side material shrinkage wrinkle. At present, the control of weld line deviation mainly depends on the adjustment measures of process plan and process parameters, and the effect is limited and sometimes it will affect the overall forming quality of the sheet. This paper analyzes the forming quality and the weld line position deviation of TWBs welding line drift caused by the problem, in order to improve the weld line position accuracy, improve the overall quality of sheet metal forming, mainly for the following work: grid mapping principle of reverse laser welding plate welding line based on reasonable arrangement the initial weld line position, adjust the process parameters to control the weld line position precision and the overall forming quality, and the simulation and real experiments through imitating the automobile door plate model. The results show that the location accuracy of weld line can be obviously improved by directly relocating the location of weld line of tailor welded blanks, and the overall forming quality can be improved. The simulation results of vehicle door inner panel model and physical experiment results are very high, and the accuracy of the method is verified. This method can be used to determine the weld line position of the laser tailor welded plate, which can be applied to the production process, which is of practical significance for guiding the production. Based on the grid mapping and the uniform Latin square test method and genetic algorithm, a method is proposed to optimize the weld line position of the laser welded blanks. The grid mapping method determines the ultimate position of each end point of the weld line, so that the initial position of the end point of the weld line can be obtained. The optimization target is the minimum value of the maximum position deviation of the weld line of the plate, and the constraint condition is that there is no crinkling and cracking of the whole sheet. Combined with the example of vehicle door inner panel model, the result shows that the sheet metal stamping after optimization method can significantly improve the location accuracy of weld line and improve the overall forming quality. This method is used to reverse the weld line from another idea to control the position precision of the weld line, and also proves the feasibility of the direct reverse method.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U466

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