设计描述：

文档包括:
Word版说明书一份，共42页，约13000字
外文翻译一份
CAD版本图纸，共7张:

工艺卡片一套
过程卡片一套
毕业设计（论文）任务书

设计（论文）题目： CA6140车床后拖架零件加工工艺及铣底面专用夹具设计                                                

接受任务时间 2007年3月5日         
教研室主任                （签名）　　系主任                 （签名）
1．毕业设计（论文）的主要内容及基本要求
1. 零件图一张, 毛坯图一张                                               
２. 夹具装配图一份, 夹具零件图一套                                            
３. 机械加工工艺卡一套, 主要工序工序卡一份                                
４. 设计说明书一份。
2．原始数据
零件图一张, 生产纲领10000件
3．指定查阅的主要参考文献及说明
1. 《机械制造工艺手册》                                                 
２.《机械零件设计手册》                                                
３.《夹具设计手册》

摘   要

在生产过程中，使生产对象（原材料，毛坯，零件或总成等）的质和量的状态发生直接变化的过程叫工艺过程，如毛坯制造，机械加工，热处理，装配等都称之为工艺过程。在制定工艺过程中，要确定各工序的安装工位和该工序需要的工步，加工该工序的机车及机床的进给量，切削深度，主轴转速和切削速度，该工序的夹具，刀具及量具，还有走刀次数和走刀长度，最后计算该工序的基本时间，辅助时间和工作地服务时间。
本文对CA6140车床后托架进行了结构和工艺分析，确定了机械加工工艺路线，制订出了零件的制造工艺方案和机械加工工艺规程，并为加工零件上底平面设计了一套专用铣床夹具。

关键词  工序，工艺，工步，加工余量，定位方案，夹紧力

ABSTRACT
Enable producing the target in process of production (raw materials, the blank , state of quality and quantity on part become always ) take place direct course of change ask craft course, if the blank is made, machining, heat treatment , assemble etc. and call it the craft course. In the course of making the craft , is it confirm every erector location and worker step that process need this of process to want, the locomotive of processing , this process , and the entering the giving amount of the lathe, cut depth , the rotational speed of the main shaft and speed of cutting, the jig of this process, the cutter and measuring tool, a one hundred sheets of number of times still leaves and a one hundred sheets of length leaves, calculate basic time of this process , auxiliary time and service time of place of working finally.
 CA6140 lathe to stand here after a technical analysis of the structure and to determine the mechanical machining line, develop a parts manufacturing processes of the programme and mechanical machining and components for the processing of facing design of a milling machine jig.

Keywords：  The process, worker one, worker's step , the surplus of processing, orient the scheme , clamp strength

目    录
中文摘要...........................................................................Ⅰ
英文摘要...........................................................................Ⅱ
第 1 章  CA6140机床后托架加工工艺............................................. 1
1.1 CA6140机床后托架的作用及简要分析.............................................1
1.2 CA6140机床后托架的工艺要求及工艺分析.........................................1
      1.2.1 CA6140机床后托架的技术要求..............................................2
   1.2.2 确定毛坯的制造形式.......................................................2
1.3 加工工艺过程..................................................................2
   1.4 确定各表面加工方案............................................................3
      1.4.1 在选择各表面及孔的加工方法时，要综合考虑以下因素..........................3
      1.4.2平面的加工................................................................3
1.4.3孔的加工方案..............................................................4
1.5　确定定位基准.................................................................4
1.5.1 粗基准的选择............................................．................4
1.5.2 精基准选择的原则.........................................................5
1.6工艺路线的拟订... .............................................................6
1.6.1 工序的合理组合...........................................................6
1.6.2 工序的集中与分散.........................................................6
1.6.3 加工阶段的划分.......................................．...................7
1.6.4 加工工艺路线方案的比较...............................．...................8
1.7 CA6140机床后托架的偏差，加工余量，工序尺寸及毛坯尺寸的确定.................... 10
1.7.1 毛坯的结构工艺要求...........................................．..........10
1.7.2 CA6140机床后托架的偏差计算..............................................11
1.8确定切削用量及基本工时（机动时间）.............................................14
1.8.1 工序1：粗、精铣底面.....................................................14
1.8.2 工序2  粗、半精、精镗CA6140侧面三杠孔....................................16
1.8.3 工序3：钻顶面四孔.......................................................22
1.8.4 工序4：钻侧面两孔.......................................................26
1.9 时间定额计算及生产安排.......................................................28
1.9.1 粗、精铣底面............................................................28
1.9.2 镗侧面三杠孔............................................................29
1.9.3 钻顶面四孔..............................................................30
第二章 专用夹具设计..............................................................32
2.1 铣平面夹具设计...............................................................32
2.1.1 研究原始质料............................................................32
2.1.2 定位基准的选择..........................................................32
2.1.3 切削力及夹紧分析计算....................................................32
2.1.4 误差分析与计算..........................................................34
2.1.5 夹具设计及操作的简要说明................................................34
结论............................................................................... 36
参考文献...........................................................................37
致谢............................................................................... 38
附录