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机械制造工程原理

课程设计

题 目: 底座工艺规程编制及工装设计

学生姓名 尹哲 专 业 飞行器制造工程 学 号 0901034133 指导教师 范国勇 李彩霞 系 主 任 马贵春

机电工程学院

2012年9月6日

目 录

1前言 ········································································································ 2 2加工工艺规程设计 ····················································································· 2

2.1计算生产纲领，确定生产类型 ······························································ 2 2.2零件分析 ························································································· 2

（1）类型及功用 ·············································································· 2 （2）结构分析 ················································································· 2 2.3零件的毛坯 ······················································································ 3 2.4定位基准的选择 ················································································ 3

（1）精基准的选择 ··········································································· 3 （2）粗基准的选择 ··········································································· 3 2.5零件表面加工方法的选择 ···································································· 3 2.6零件加工工艺路线的拟定 ···································································· 4 2.7工序设计 ························································································· 4

（1）选择机床、刀具及量具 ······························································· 4 （2）确定机械加工余量 ····································································· 5 （3）确定切削用量及基本工时 ···························································· 5

3专用量具设计 ··························································································· 8

3.1工序尺寸精度分析 ············································································· 8 3.2量具类型确定 ··························· 8 3.3极限量具尺寸公差确定 ······················· 8 3.4量具公差带图 ··························· 9 4收获及心得体会 ························································································ 9 参考文献 ·································································································· 10

1前言

机械制造工程原理课程设计使我们学完了大学的全部基础课、技术基础课以及大部分专业课之后进行的。这是我们在进行毕业设计之前对所学各课程的一次深入的综合性的总复习,也是一次理论联系实际的训练,因此,它在我们四年的大学生活中占有重要的地位。

机械制造技术基础课程设计是在我们学习完了机械制造技术、机械制造装备设计等课程的基础上，在进行了生产实习之前，进行的一个重要的实践性教学环节。其主要目的是通过《机械制造工程原理》课程设计，锻炼学生查阅资料、查阅国标手册的能力；培养创新能力，提高工艺设计能力、动手能力和初步的科学研究能力；为以后的毕业设计和工作奠定基础。

2加工工艺规程设计

2.1 计算生产纲领

确定生产类型（轻型机械） 计算生产纲领，确定生产类型（轻型机械）

（1）生产纲领：零件的年生产量为 500 件/年，取产品零件的备品率 4%，机加工废 品率 1%，则可以求得该零件的年生产纲领： N=Qm（1+a%+b%）=500x1x（1+4%+1%）=525（件/年） （2）（2）生产类型：查设计指导 P5 表 1—5 可确定该零件为中批生产类型。

2.2 零件分析

（1）类型及功用 本次课程设计所设计的凸模，该零件属于轴类零件，在工作过程中多受剪切力和扭矩的作用。

（2）结构分析 本次所设计的凸模结构较为简单，视图正确、完整，尺寸、公差要求齐全。零件各个表面 加工并不困难。该零件的主要加工表面有：

① φ 101 外圆柱面加工； ② φ40圆柱面加工

③ φ97.5圆柱面及其外端面加工 ④ φ40及φ101端面加工

⑤ 孔深40mm的M20-6H孔。

2.3 零件的毛坯

零件材料为45钢。由于在车床运行中要经常进行切削运动，零件在工作过程中 则经常承载载荷及切割性载荷，因此应选用型材，保证零 件工作可靠。根据 2.1 可知该零件的生产属于中批生产，而且零件的轮廓尺寸不大，形 状也不复杂，故做毛坯可以采用切断成型。因为形状较简单，所以毛坯的形状可以与零 件的形状尺寸接近，即外形做成圆柱状。毛坯尺寸通过确定加工余量后确 定。