（毕业设计论文）《40Cr东方红40拖拉机驱动轴热处理工艺设计》.doc

精品 目录 前言..................................................1 2 驱动轴材料与热处理工艺概况.............................2 2.1 驱动轴的简介.........................................2 2.2 拖拉机驱动轴的服役条件和失效形式.....................3 2.3 拖拉机驱动轴的性能要求...............................4 2.4 驱动轴热处理工艺概况.................................4 3 40Cr的基本性质........................................5 3.1 40cr的化学成分及力学性能............................6 3.2 合金元素的作用.......................................6 3.2.1 40Cr刚中硅元素的作用...............................6 2.2.2 40Cr刚中铬元素的作用...............................7 3.2.3 40Cr刚中锰元素的作用...............................8 3.3 组织转变及淬透性.....................................8 4. 拖拉机驱动轴生产工艺路线及分析........................10 4.1 拖拉机驱动轴的选材...................................10 4.2 40Cr热处理工艺特性...................................11 4.3 40Cr拖拉机驱动轴工艺路线及热处理方案分析.............11 4.4 热处理工艺的确定.....................................13 4.5 热处理常见的缺陷及防护措施...........................15 4.5.1 氧化和脱碳.........................................15 4.5.2 过热和过烧.........................................16 4.5.3 淬火硬度不够.......................................16 4.5.4 软点..............................................17 4.5.5 变形和开裂.........................................17 4.5.6 回火缺陷...........................................18 4.6 热处理工艺及曲线图...................................19 4.6.1 正火工艺的制定.....................................19 4.6.2 淬火工艺的制定.....................................19 4.5.3 回火工艺的制定.....................................20 4.7 金相分析.............................................21 4.7.1 正火热处理的金相分析...............................21 4.7.2 调原始组织为热处理的金相组织.......................22 5 质量检验...............................................23 5.1 检验项目.............................................23 5.1.1 硬度...............................................23 5.1.2 变形...............................................23 5.1.3 外观...............................................23 5.2 评定标准.............................................23 设计总结..........