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机械制造

题目:支架的机械加工工艺规程

及镗孔夹具设计

所在学院:郑州科技学院 专 业:机械设计制造及自动化 班 级:10级一班 姓 名:高 齐 学 号:201033010 指导老师:gao qi

2013 年 11 月 13 日

目录

1.引言 ·········································································································································· 1 2.课程设计的目的 ················································································································ 1 3.支架的工艺分析 ················································································································ 2

3.1支架的结构及其工艺性分析 ·············································································· 3 3.2支架的技术要求分析····························································································· 3

4毛坯的选择 ···························································································································· 4 5支架机械加工工艺路线的制定 ················································································· 4

5.1定位基准的选择 ······································································································· 4

5.2拟定工艺路线 ··········································································································· 5 5.3加工余量和工序尺寸的拟定 ·············································································· 7 5.4切削用量的确定 ······································································································ 8

6夹具的设计 ·························································································································· 13

6.1设计要求 ··················································································································· 13 6.2夹具设计 ··················································································································· 13 6.3定位误差的分析 ···································································································· 13 6.4夹具设计及操作的简要说明 ············································································ 14

总结 ·············································································································································· 15 参考文献 ··································································································································· 16 致谢 ·············································································································································· 17

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1.引言

工艺综合课程设计是机械类专业的一门主干专业基础课，内容覆盖金属切削原理和刀具、机械加工方法及设备、互换性与测量技术、机械制造工艺学及工艺装备等，因而也是一门实践性和综合性很强的课程，必须通过实践性教学环节才能使我们对该课程的基础理论有更深刻的理解，也只有通过实践才能培养我们理论联系实际的能力和独立工作能力。因此，工艺综合课程设计应运而生，也成为机械类专业的一门重要实践课程。

2.课程设计的目的

工艺综合课程设计旨在继承前期先修基础课程的基础上让我们完成一次机械零件的机械加工工艺规程和典型夹具设计的锻炼，其目的如下:

（1）通过本次设计使我们所学到的知识得到巩固和加深。培养我们全面综合地应用所学知识去分析和解决机械制造中的问题的能力。

（2）通过设计提高我们的自学能力，使我们熟悉机械制造中的有关手册、图表和技术资料，特别是熟悉机械加工工艺规程设计和夹具设计方面的资料，并学会结合生产实际正确使用这些资料。

（3）通过设计使我们树立正确的设计理念，懂得合理的设计应该是技术上先进的，经济上合理的，并且在生产实践中是可行的。

（4）通过编写设计说明书，提高我们的技术文件整理、写作及组织编排能力，为我们将来撰写专业技术及科研论文打下基础。

3.支架的工艺分析

3.1支架的结构及其工艺性分析

由支架零件图可知，该支架结构形状对称布置。主要由底板、肋板和圆柱孔等部分构成。支架的主要加工表面有：支架底面、肋板孔与圆柱孔、肋板孔内端面及圆柱孔上端面等。其中支架底面的表面粗糙度Ra≤1.6μm，肋板内表面的表面粗糙度Ra≤3.2μm，定位孔φ6H7，肋板上的孔径φ40H7，圆柱孔的孔径φ60H8，两肋板间的距离75H8，以及圆柱孔的内表面与上端面的表面粗糙度Ra≤3.2μm是重要尺寸。

3.2支架的技术要求分析

该支架零件的主要技术要求为： 1.未注明圆角半径R5；

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