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| 1 | 一种微管单点成形有限元分析及成形机关键零部件承载分析显示文摘目的为进一步扩展渐进成形技术在管件成形加工方面的应用,提高微管的成形复杂度、缩短加工时间,设计一款微管渐进成形机,对关键零部件承载及管件单点成形进行有限元分析。方法通过对管件渐进成形机中关键零部件的静力学分析,根据有限元软件得到的仿真数据,对渐进成形机关键零部件进行尺寸修正和强度校核。结果在管件的渐进成形加工中扩径20%的情况下管件壁厚平均减薄率为7.7%,管件渐进成形机的最大工作半径为83 mm。结论管件成形机可达到设计要求,通过对管件加工工具的结构进行设计和优化,在保证零件强度的同时提高管件的扩径范围,在提高管件加工速度和可加工复杂度的同时降低减薄率。 | 张奥强 杨晨 | 2021 | 精密成形工程2021，13，6： | 0 |
| 2 | Al6063管件外增量成形工艺研究显示文摘目的研究6063铝合金管件外增量成形过程,分析管件的成形效果,改进管件成形质量。方法设置3组目标成形管件,使用Abaqus软件进行成形过程的数值模拟,通过考察成形管件的几何精度、壁厚分布、表面质量、成形力,分析成形质量和可能出现的问题。通过使用长120 mm、直径50 mm、壁厚1.5 mm的Al6063铝管进行管件外增量成形实验,验证数值模拟结果的可靠性。结果成形管件会发生管端变形现象,具体表现为管端不圆与轴向伸长,成形件管端椭圆度为10.11%,管端变形程度与成形道次成正比,且在距离管端越近的成形区域,管端变形越明显。管壁成形区厚度增大并呈现不均匀分布。成形件管壁直线度偏差为0.34,且表面质量与径向进给量和轴向进给速度成反比,管件的圆角尺寸难以严格控制。径向力是成形过程中主要的成形力,其大小与工具头直径成正比。结论管件外增量成形原理可靠,基于此能够实现多种目标管件的成形。由于成形原理的限制,成形件的成形质量还有很大的提升空间,合理制定工艺参数对提高成形质量十分重要。 | 肖征宇 杨晨 | 2023 | 精密成形工程2023，15，12： | 0 |
| 3 | Formation mechanism and modeling of surface waviness in incremental sheet forming显示文摘mproving and controlling surface quality has always been a challenge for incremental sheet forming (ISF), whereas the generation mechanism of waviness surface is still unknown, which impedes the widely application of ISF in the industrial field. In this paper, the formation mechanism and the prediction of waviness are both investigated through experiments, numerical simulation, and theoretical analysis. Based on a verified finite element model, the waviness topography is predicted numerically for the first time, and its generation is attributed to the residual bending deformation through deformation history analysis. For more efficient engineering application, a theoretical model for waviness height is proposed based on the generation mechanism, using a modified strain function considering deformation modes. This work is favorable for the perfection of formation mechanism and control of surface quality in ISF. | Kai HAN Xiaoqiang LI Yanle LI Peng XU Yong LI Qing LI Dongsheng LI | 2022 | Frontiers of Mechanical Engineering2022，17，2： | 0 |
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