摘要金属材料的力学性能依赖于其内部的晶粒结构。大塑性变形法在大块的金属材料 中施加了非常大的压力,导致其晶粒细化,力学性能得到强化,但在实验样本的总体 尺寸却没有大的改变。此法可制备大体积的超细晶材料,具有较大的工业应用潜力。82593
论文研究了大塑性变形法之一的反复折弯校直法对工业纯铝 1060 力学性能与硬 度的影响规律;采用 DEFORM 仿真模拟软件对不同的工艺变形路线进行模拟分析, 分析其应变的积累以及其对材料性能的影响和演变规律,并与实际的实验进行比较, 提供指导;设计折弯校直模具,并针对折弯模具的不足之处加以分析和改良;实验过 程则进行了不同模压工艺路线、不同板料厚度和不同模压道次的折弯校直实验,并且 通过拉伸实验测量折弯校直后的板材的抗拉强度和屈服强度,分析了材料力学性能的 变化规律。
毕业论文关键词:反复折弯校直;工业纯铝;模具设计;力学性能;柔性反复折弯校直
Abstract The mechanical properties of metallic materials depend on their internal structure。 The large plastic DEFORMation method is very large in the bulk of the metal material, leading to its grain refinement, mechanical properties are enhanced, but there is no big change in the overall size of the experimental samples。 This method can be used to prepare bulk ultrafine grained materials with great potential for industrial applications。
This paper studied the influence of repeated bending and straightening method of plastic DEFORMation on the properties and hardness of pure aluminum 1060 mechanics; DEFORMation of different route simulation software process simulation analysis by DEFORM simulation, analysis of the strain accumulation and its influence on the material properties and evolution of the law, and with the actual experiment comparison, provide guidance; the design of bending straightening die, and aiming at the shortage of the bending mold analysis and improvement; experimental process of different molding process, different thickness and different compression times bending straightening experiment, and through the tensile strength tensile experiment after bending straightening and yield strength analysis the variation of mechanical properties of materials。
Key words: repetitive corrugation and straightening; industrial pure aluminum; die design; mechanical properties;flexibilityrepetitive corrugation and straightening
目 录
第一章 绪论 1
1。1 引言 1
1。2 反复折弯校直法的介绍及存在问题 1
1。3 影响模压变形的因素 3
1。4 选题的意义和主要研究内容 4
第二章 实验材料及分析测试方法 5
2。1 实验材料 5
2。2 反复折弯校直法实验方案 5
2。3 拉伸试样制备 7
2。4 拉伸试样断口形貌分析 8
2。5 硬度测量 8
第三章 模具设计及 DEFORM 模拟 9
3。1 模具的设计 9
3。1。1 折弯模具设计 9
3。1。2 校直模具设计 9
3。2DEFORM 介绍