镗孔夹具图A0
WH212减速器箱体加工工艺及夹具设计
摘要
此设计的主要对象是WH212减速器箱体，主要设计任务有两部分，第一部分：箱体加工工艺规程的设计；第二部分：箱体部分工步专用夹具设计。在加工工艺规程设计中，首先对零件进行结构分析，这部分工作包括分析技术要求和确定毛坯材料。在确定这些前提后，需要综合零件的材料、生产数量及生产实际来确定毛坯的制造形式，其次选择加工基准，制定工艺路线，最后进行加工余量、工序尺寸及切削用量等的计算与确定。这都需要设计者具有按照图纸制定完善机械加工工艺及装配工艺的能力。
在专用夹具的设计中，首先根据该工序的前后工序和加工特点来进行定位方式的选择，其次选择夹紧方式，最后进行切削力及夹紧力的计算和误差的分析。本文涉及两种夹具，镗孔夹具和钻孔夹具。在选择夹紧方式时参考夹具图册，从元件库中调用夹具元件或者查表找出标准件尺寸，不能找到的自主设计完成。
所有工作在工艺卡片、夹具装配图中集中体现，特别是在做机械加工工艺卡片时要加入工序简图，针对每一道工序要选择合理的定位、夹紧方式。设计的原则是尽量切合生产实际，这就要求时刻做到理论与实际相结合的原则，在工序、刀具、机床、切削用量、夹具元件的选取上以常见、通用为前提，然后考虑作用效果、经济成本，所以应在实用性的基础上再考虑创新性。
整个设计用CAXA2007完成零件图和装配图的绘制，用SolidWorks2010完成三维图的绘制。
关键词：箱体；工艺规程；切削用量；定位；夹具
Abstract
Main target of this graduation project is WH212 gear case. There are two parts in the main design task: first design the reduction case planning process; the other is dedicated fixture design for part of the process steps. In the process planning programming, structural analysis should be the first; this section includes technical requirements and stock materials. After these preconditions determined,we should determine the rough form of manufacturing combine part of the material, production quantity and the actual production, and then second select the processing benchmarking process route.Finally, calculation and determination the allowance, process size, and cutting parameters.It need the designer have enough ability to design proper mechanical process and assembling process.
During the special fixture design, first select the positioning method, reference the before and after processing characteristics, followed is the clamping method, and finally are cutting clamping force calculation and error analysis.There it need to design two fixtures,fixture for boring and fixture for drilling. With reference the fixture atlas to choose a clamping project, and transfer fixture component from the component library, look up to find the standard size, or to design.
All ofwork concentrative reflect in process card and fixture installationdiameter, especially in make a process card, it need maching in a process picture of each step and chooses a reasonable position for every clamping method.The design principles is in linewith actual production as far as possible, It requires thatwe must combine theorywith practice as a principle,while on the selection of process, tooling, machine tools, cutting, and fixtures, the common, universal premise should be the first then consider the effect and economic cost, so practicability should be considered on the basis of innovative.
The design completedwith CAXA2007 and three-dimensional drawingwith SolidWorks2010
Keywords: gear case; process planning; the amount of cutting; positioning; fixture
目录
引言1
1零件的分析1
1.1零件的作用及结构特点1
1.2零件图分析2
1.3零件主要技术指标4
2工艺规程设计5
2.1确定毛坯材料5
2.2确定毛坯的加工工艺过程5
2.3毛坯尺寸公差和机械加工余量等级的确定6
2.4定位基准的选择7
2.4.1精基准的选择7
2.4.2粗基准的选择7
2.5加工方法的选择8
2.5.1主要加工方法的加工经济精度及表面粗糙度8
2.5.2面加工8
2.5.3孔加工9
2.5.4检测方法的选择10
2.6加工路线的确定10
2.6.1拟定加工路线方案一10
2.6.2拟定加工路线方案二11
2.6.3确定加工路线12
2.7机械加工余量及毛坯尺寸的确定15
2.7.1铸件机械加工余量15
2.7.2主要毛坯尺寸及公差15
2.8工序尺寸和公差的确定16
2.8.1面加工16
2.8.2孔加工20
3确定切削用量和机械加工时间定额21
3.1面加工21
3.1.1粗铣部分22
3.1.2半精铣部分26
3.1.3磨削加工30
3.2孔加工31
3.2.1镗孔加工31
3.2.2通孔、螺纹孔34
3.2.3锪孔50
4夹具设计51
4.1镗床夹具设计51
4.2镗套设计52
4.3切削力及夹紧力的计算53
4.4定位误差的计算54
5结论55
参考文献57
箱体底座A1图
镗架4A3
箱体底座毛坯图A3
箱体上盖A1图
箱体上盖毛坯图A3
3设计所包含文件
4目录
5夹具设计部分
1字数
2摘要
6过程卡
7工序卡
