摘  要
零件的工艺编制是否合理，直接关系到零件的加工能否达到质量要求；合理的工艺编制就能使各工序科学地衔接，实现优质、高产低消耗，使生产均衡、顺利地进行。同时，机床夹具在机械制造中也占有重要的地位，合理的夹具设计能可靠地保证工件的加工质量，提高加工效率，减轻劳动强度，充分发挥和扩大机床的工艺性能。可见这两者在机械制造行业中是至关重要的环节。本次设计的是减速箱箱体上100孔的加工工艺及夹具设计，该孔精度要求较高，采有用镗床加工。在编制加工工艺时，要考虑到孔的各项精度以及形状与位置公差等。
在设计加工100孔的专用夹具时，以箱座底面为基准，采用一面两销定位，通过连接螺栓将箱盖和箱座联结，并以定位销将其定位。为了降低成本、减少装夹时间，采用凸轮联动夹紧装置。逆时针转动手柄时，在拉伸弹簧的作用下，压板松开，放入工件，顺时针转动手柄带动凸轮推动推杆，从而压紧工件。
关键词：工艺；夹具；定位；位置公差

ABSTRACT
The preparation of parts of the process is reasonable, directly related to the machining quality requirements can be met; reasonable preparation process will enable the convergence of scientific processes to achieve high-quality, high-yield low, so that the production of a balanced, smoothly. At the same time, in the machinery manufacturing fixture also occupy an important position, reasonable and reliable fixture design can guarantee the quality of the workpiece processing, improve processing efficiency, reduce labor intensity and give full play to the technology and the expansion of machine tool performance. Can be seen both in the machinery manufacturing industry is vital link. The design of the deceleration box box holes 100 and fixture design process, the holes require a higher precision, boring process mining useful. In the preparation process, it is necessary to take into account the pore shape and location accuracy, as well as tolerance and so on.
  Hole in the design of special processing fixture 100 when the seat bottom to me based on           the use of a two-pin position, through the bolt cover and the box seat to join, and its
positioning pins. In order to reduce costs, reduce the clamping time, linked the use of cam clamps. Handle counter-clockwise rotation, in the role of the tensile spring, the platen release into the workpiece, the processing has been completed, turning the handle clockwise to promote putt cam driven, thus compacting the workpiece.
Keywords: Technology; fixture; positioning; position tolerance parts
摘  要    …Ⅰ
ABSTRACT    Ⅱ
第一章  绪论    1
1.1 课题研究的目的及内容    1
第二章  零件的工艺分析    2
2.1 零件的作用    2
2.3 零件生产类型的确定    3
第三章  零件的工艺规程设计    4
3.1 确定毛坯的制造形式    4
3.2 确定机械加工余量及毛坯尺寸    4
3.3 定位基准的选择    6
3.4 零件表面加工方法的选择    7
3.5 制订工艺路线    9
3.6 工序设计    12
3.7 确定切削用量及基本工时    14
第四章  专用夹具设计    23
4.1 问题的提出    23
4.2 定位方案及定位元件的选择    23
机械论文4.3 夹紧方案及夹紧元件的选择    25
4.4 夹具体的选择    27
4.5 自锁条件的计算    27
4.6 夹紧力的计算    27
4.7 定位误差的计算    29
4.7夹具的使用    30
第五章 结论    31
参考文献    32
致 谢    33