锻压技术

基于数字化的蒙皮拉形加载轨迹优化与应用

英文标题：Optimization and application of loading trajectory in stretch forming of skin based on digital

作者：谢洪志王玲赵天章金龙李卫东

关键词：蒙皮拉形加载轨迹数字化减薄贴模

分类号：V260; TG386

出版年,卷(期):页码：2021,46(1):56-59

摘要：

针对飞机平尾前缘蒙皮零件，提出了利用数字化的方法进行拉形加载轨迹的优化思路。首先，计算出零件成形所需的拉伸率和包覆角，应用飞机蒙皮拉形工艺设计与制造系统对加载轨迹进行仿真，优化得到了成形精度高的钳口运动轨迹；其次，将运动轨迹转化为边界条件，利用Pamstamp有限元模拟分析了拉形后的减薄和贴模情况，以说明优化后的加载轨迹的合理性；最终，获得了分两次拉形的加载轨迹，并自动生成设备钳口的拉伸运动轨迹。利用厚度为3.5 mm的2A12铝合金O状态板料进行了拉形试验，发现成形零件的厚度均匀（3.18~3.29 mm）、贴模良好，成功地避免了成形缺陷的产生，验证了数字化加载轨迹优化思路的可行性，为智能化精确制造技术的开发奠定了基础。

For the skin parts of flat tail leading edge for plane, the optimization idea on loading trajectory in stretch forming by digital method was proposed. Firstly, the stretching rate and covering angel required for part forming were calculated, then the loading trajectory was simulated by using the stretch forming process design and manufacture system for plane skin, and an optimized jaw motion trajectory with high forming accuracy was obtained. Secondly, the motion trajectory was transformed to boundary conditions. The thinning and sticking mold conditions were analyzed by Pam-stamp finite element simulation after stretch forming to show the rationality of the optimized loading trajectory. Finally, the loading trajectory with twice stretch forming was proposed, and the motion trajectory of stretch forming for equipment jaw was automatically generated. The stretch forming test was carried out using the 2A12 aluminum alloy sheet material of O status with the thickness of 3.5 mm. The results show that the thickness distribution of formed part is uniform (3.18-3.29 mm), the effect of sticking mold is better, and there is no forming defects. It verifies the feasibility of this optimization idea on loading trajectory based on digital, and it lays a foundation for the development of intelligent accurate manufacturing technology.

基金项目：

基金项目:国家自然科学基金资助项目（51605310）

作者简介：谢洪志（1985-），男，学士，高级工程师 E-mail：xhz_0920@163.com

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