紫铜薄壁管材内增量成形力的研究

发布时间：2018-05-04 00:43

本文选题：薄壁管 + 内增量　；参考：《西安理工大学》2017年硕士论文

【摘要】：在航空航天、石油化工及民用工业领域,存在大量不同形式的管材及不同类型的内表面,如何实现这些内表面高效、高精度成形是一个重要的工程问题。薄壁管材内增量成形工艺是通过成形工具对薄壁管进行挤压和碾压迫使金属产生流动,从而形成目标制件的一种新型管材柔性成形技术。。该技术采用简单的设备和成形工具即可实现对复杂薄壁管件的连续塑性成形,具有柔性好、成本低、绿色节能等优点。本文研究薄壁管材内增量成形力,为该技术在工程上的应用提供指导。分析了薄壁管材内增量成形原理和成形过程运动关系,给出了成形工具自转转速与主轴转速之间的数学表达式。依据薄壁管材内增量成形原理,应用主应力法对薄壁管材变形区的材料切取基元体,建立了基元体的应力平衡微分方程和边界条件,获得了变形区材料的成形力解析表达式,为该技术成形设备的选择和工艺参数的优化提供理论依据。建立了紫铜薄壁管材内增量成形有限元分析模型,应用ABAQUS分析软件获得了成形过程的等效应力、应变和管壁厚度的分布规律,研究了径向进给量、成形工具圆角半径、起始成形距离和管壁厚度对成形力的影响,获得了不同工艺参数对成形力的影响规律。建立了薄壁管材内增量成形实验系统,进行了不同工艺条件下紫铜薄壁管材内增量实验,通过正交实验分析了不同工艺参数对成形力的影响,建立了紫铜薄壁管材内增量成形力的经验公式,验证了理论解析和仿真分析的正确性。
[Abstract]:In Aeronautics and Astronautics, in the field of petrochemical and civil industry, there are a large number of different types of tubes and different types of inner surfaces. How to achieve high efficiency and high precision forming of these inner surfaces is an important engineering problem. The incremental forming process in thin-walled tubes is to press and crush the thin tubes to force the metal flow through the forming tool. A new flexible tube forming technology for forming the object parts. This technology can realize continuous plastic forming of complex thin-walled tubes with simple equipment and forming tools. It has the advantages of good flexibility, low cost and green energy saving. This paper studies the internal increment forming force of thin-walled tube, and provides the application of this technology in engineering. The principle of incremental forming and the relation between the forming process and the forming process are analyzed. The mathematical expression between the rotation speed of the forming tool and the spindle speed is given. According to the principle of incremental forming in the thin-walled tube, the principal stress method is used to cut the material of the deformation zone of the thin-walled tube, and the stress balance differential of the basic element body is established. The analytic expression of the forming force of the deformation zone material is obtained. The theoretical basis for the selection of the forming equipment and the optimization of the technological parameters is provided. The finite element analysis model of the incremental forming in the thin-walled copper tube is established. The equivalent stress, strain and the thickness of the tube wall are obtained by using the ABAQUS analysis software. The influence of the radial feed, the radius of the forming tool, the initial forming distance and the thickness of the tube wall on the forming force are studied. The influence of the different process parameters on the forming force is obtained. An experimental system of incremental forming in the thin-walled tube is established. The effect of different process parameters on the formability is analyzed. The empirical formula of incremental forming force in the thin-walled copper tube is established, and the correctness of theoretical analysis and simulation analysis is verified.

【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG306

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