| 摘要: |
| 基于固有应变法开展不同成形高度和不同壁厚及顶部过渡设计下的薄壁结构增材制造工艺仿真，首先通过试验与模拟相结合的方法获得仿真所需的固有应变值，之后分析了薄壁结构不同成形高度和不同壁厚及顶部过渡设计下的变形分布规律，与实物三维扫描结果进行对比，仿真结果与实物拟合较好，通过仿真分析可知，打印后的薄壁结构存在明显的收缩线，收缩线出现在薄壁与封顶的搭接位置。相同壁厚下，圆角薄壁的收缩痕变形高于斜角薄壁；保持圆角设计，发现随着壁厚增加，收缩痕变形逐渐减小。圆角过渡下，壁厚从0.6 mm增加到1.5 mm时，薄壁中心区域的变形由0.334 3 mm逐渐降低为0.096 3 mm。Z方向应力壁面边缘及封顶区域存在拉应力，而薄壁中心位置存在压应力。 |
| 关键词: 翼舵 增材制造 工艺仿真 固有应变 |
| 基金项目: |
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| Simulation of Laser Selective Melting Forming Process for Thin-walled Superalloy Structures |
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Cui Zhaoxing Qian Yuanhong Chen Rong Cui Zhaowen Liu Yingying Li Zhiyong
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Beijing Xinghang Electro-mechanical Equipment Co., Ltd., Beijing 100074
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| Abstract: |
| Based on the inherent strain method, the additive manufacturing process of thin-walled structures with different forming heights, different wall thicknesses and top transition designs was simulated. Firstly, the natural strain value required by simulation was obtained by combining the test and simulation method, and then the deformation distribution of thin-walled structures with different forming heights, wall thicknesses and top transition design was analyzed , and the simulation results were compared with the real three-dimensional scanning results, and the simulation results were well fitted to the real objects. Through simulation analysis, it could be seen that there was an obvious shrinkage line in the printed thin-walled structure, and the shrinkage line appeared at the overlapping position of the thin-walled and capped. Under the same wall thickness, the shrinkage mark deformation of fillet thin wall was higher than that of beveled thin wall. Maintaining the rounded corner design, it was found that the shrinkage mark deformation gradually decreased as the wall thickness increased. When the wall thickness increases from 0.6 mm to 1.5 mm, the deformation of the thin-walled center area gradually decreased from 0.334 3 mm to 0.096 3 mm. There were tensile stresses at the edge of the wall and capping area in the Z direction, while compressive stresses existed at the center of the thin wall. |
| Key words: wing rudder additive manufacturing process simulation the inherent strain |
