机械制造技术课程设计 倒挡拨叉工艺及钻19.doc.doc

摘 要

本次设计内容涉及倒挡拨叉的机械制造工艺及工装夹具设计的内容。

根据倒挡拨叉的零件图分析其精度、表面粗糙度、技术要求、加工部位尺寸、形状

结构及零件的批量生成的，确定被加工零件工艺方法和工艺过程，并选择好倒挡拨叉的

加工基准，设计出倒挡拨叉的工艺路线；接着对倒挡拨叉各个工步的工序进行尺寸计算，

关键是决定出各个工序的工艺装备及切削用量和基本工时；然后进行专用夹具的设计，

在选择设计出夹具中，本次针对倒挡拨叉的工艺确定设计两套夹具。此两套夹具分别是

铣叉口两侧面的夹具和钻铰孔φ19.1 夹具。在设计夹具过程中，需要考虑的是如定位元

件、夹紧元件、夹具体、对刀件以及其它部件；计算出夹具定位时产生的定位误差，分

Based on the analysis of its accuracy, surface roughness, technical requirements, the

batch processing spot size, shape structure and parts of the generation of the fork of the parts

diagram, identify processing technology method of parts and process, and the choice of

processing benchmark good fork, the fork of the design process is obtained; then the fork each

step process calculation of dimensions, the key is to determine the craft equipment and the

cutting parameters and the basic working hours each working procedure; then design the

special fixture, in the choice of design fixture, the process of shifting fork to determine the

design of two sets of fixture. The two sets of clamps are slot milling jig and fixture for drilling

slant hole diameter of 19.1. Fixture in the design process, need to consider is if the positioning

element, clamping element, clamp, tool parts and other components; calculate fixture

摘 要 ....................................................................................................................................ii

Abstract......................................................................................................................................iii

第一章 绪 论......................................................................................................................- 1 -

第二章 零件的分析............................................................................................................- 3 -

2.1 零件的作用............................................................................................................- 3 -

2.2 零件的工艺分析.....................................................................................................- 3 -

4.1.2 粗基准的选择.............................................................................................- 7 -

4.1.3 精基准的选择.............................................................................................- 7 -

4.2 零件表面加工方法的选择.....................................................................................- 8 -

4.3 制定工艺路线.........................................................................................................- 8 -

4.5 确定工序尺寸......................................................................................................- 12 -

第五章 确定切削用量及基本时间..................................................................................- 13 -

第六章 部分工序专用夹具设计........................................................................................- 21 -

6.2.1 定位基准的选择...............................................................................................- 23 -

6.2.2 定位元件的设计与选择...................................................................................- 23 -

6.2.3 定位误差的分析...............................................................................................- 23 -

6.2.4 切削力的计算...................................................................................................- 25 -

6.2.5 导向件的设计..................................................................................................- 26 -

6.2.7 夹具操作说明...................................................................................................- 29 -

结 论....................................................................................................................................- 31 -

参 考 文 献........................................................................................................................- 32 -

致 谢..................................................................................................................................- 33 -