摘要作为大塑性变形法的典型代表，高压扭转法有着能显著提高材料性能，细化晶 粒的特点。基于此，本课题提出了类似该于方法的旋挤工艺，而研究该工艺的特点 以及为其选择合理的工艺参数是十分重要的。本文采用了 deform3D 仿真软件来对 旋挤工艺进行仿真研究。先利用 3D 建模软件 PROE 建立了筒形件和管材件旋挤成 形的三维模形；然后分析解决了模拟过程中所遇到的关键问题的处理方式；接着对 纯铝筒形件和管材件的成形过程进行模拟，获得了相关的包括等效应力、等效应变、 温度、载荷方面的数据信息，并通过数值模拟分析了摩擦系数、旋转速度、上模结 构对于成形的影响。模拟的结果表明，旋挤工艺可以使材料获得较大的塑性变形量， 摩擦系数、上模旋转速度的增加会增大材料的等效应变并提高材料的温度；摩擦系 数的增加会增大等效应力及载荷而上模旋转速度的增加却会使等效应力及载荷减 小；上模结构选择端面开槽有助于增加材料的变形量。80630

毕业论文关键词：  旋挤工艺；大塑性变形；高压扭转；模拟仿真

ABSTRACT As a typical representative of Severe Plastic deformation process, the High Pressure Torsion can significantly improve the performance of the material and fin grain。 Based on this, this topic presented a method of rotating extrusion。 And it is very important to study the characteristics of the process to select the reasonable parameters for the process。 This article used simulation software named DEFORM-3D to study on the simulation of rotary extrusion process。 First of all, PROE-3D modeling software is adopted to establish the three-dimensional modeling of cylinder and a spiral tube。 Secondly, this article analyzed the approach to solve all kinds of key problems in the process of simulation。 Then, the simulation of tube piece and pipe piece was happened and the data information of equivalent stress equivalent strain temperature and load was obtained。 And then the article analyzed the influence of friction coefficient the rotating speed and the structure of upper die in the process of the forming。 The simulation results showed that the process can make the material obtain large amount of plastic deformation, the increase of friction coefficient and the rotation speed of the upper die will increase the equivalent strain and the temperature of the material。 The increase of friction coefficient will increase the equivalent stress and the load but the increase of the rotation speed of the upper die will reduce them。 The upper die with slotted structure will be helpful to increase the amount of deformation of the material。

Keywords: rotary extrusion process; Severe Plastic Deformation; High Pressure Torsion; analog simulation

目 录

第一章 绪论 1

1。1  引言 1

1。2  大塑性变形简介 1

1。3  高压扭转工艺 2

1。3。1  高压扭转工艺简介 2

1。3。2  高压扭转的发展 3

1。3。3  高压扭转工艺的影响因素 4

1。3。4  高压扭转法的应用 5

1。4  反挤压工艺 5

1。4。1  反挤压工艺简介 5

1。4。2  反挤压工艺的优缺点 6

1。5  本文研究的目的、意义及内容