摘  要
 
    柴油机气缸体是大批量生产的零件。为了提高生产效率，满足被加工零件的精度要求，本课题设计了一台用于ZH1110柴油机气缸体三面粗镗孔的组合机床。本课题主要进行了组合机床总体设计和夹具设计。首先是总体设计，采用单工位三面粗镗孔组合机床，考虑的因素有刀具、切削用量、切削力、切削扭矩及切削功率等，通过计算选择主轴直径、外伸尺寸、接杆型号、滑台、动力箱等通用部件，再确定动力部件的工作循环及工作行程，完成机床总体设计。其次是夹具设计，通过对被加工零件的全面分析，采用三面定位和固定镗模板可换导套导向；夹紧装置采用液压夹紧机构，直接夹紧与工件上；夹具体为框架式结构，有良好的刚性，使夹具能长期保持可靠的精度和稳定性。该组合机床不仅能保证加工精度，还能提高加工效率。整个机床布局合理，夹紧可靠，精度较高，使用操作方便，提高了工作效率，达到了设计要求。
 
关键词：组合机床；粗镗；夹具；气缸体

 目    录
 
1前言··················· 1
2组合机床总体设计············· 3
2.1组合机床工艺方案的制定········· 3
2.1.1工艺基准面的分析··········· 3
2.1.2工艺方案的拟订············3
2.1.3确定机床完成工艺时的一些限制·····3
2.2组合机床配置型式的选择········· 3
2.2.1组合机床配置型式··········· 4
2.2.2 定位基准的选择············ 4
2.3确定切削用量及选择刀具·········· 4
2.3.1选择切削用量··············4
2.3.2 计算切削力、切削扭矩及切削功率······6
2.3.3选择刀具结构················ 11
2.4组合机床总体设计－－三图一卡········· 12
2.4.1被加工零件工序图··············12
2.4.2 加工示意图················· 13
2.4.3机床尺寸联系图················14
2.4.4机床生产率计算卡···············17
3 夹具设计····················19
3.1夹具设计的基本要求和步骤············19
3.1.1夹具设计的基本要求·············· 19
3.1.2夹具设计的步骤················18
3.2定位方案的确定················· 20
3.2.1零件的工艺性分析···············20
3.2.2定位方案的论证················20
3.2.3误差分析···················21
3.2.4导向装置··················· 23
3.3夹紧方案的确定·················23
3.3.1夹紧装置的确定················23
3.3.2夹紧力的确定················· 24
3.3.3 油缸的选择·················· 26
3.4夹具体的设计·················· 26
4结论······················· 28
参考文献·····················29
致谢······················· 30
附录······················· 31