毕业设计（论文）-汽车后桥减速器粗镗夹具设计.doc

摘要
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组合机床是随着生产力的发展,由万能机床和专用机床发展而来的。具有较高的加工效率、加工精度及加工工艺性能,工序高度集中等特点。
机床夹具是机械制造中一项重要的工艺装备。工件在机床上加工时,为保证加工精度和提高生产效率,必须使工件在机床上相对刀具占有正确的位置,为克服切削过程中工件受外力的作用而破坏定位,还必须对工件施夹紧力。
与之相对应的专用夹具的设计—是根据加工表面的具体情况,选择合理的定位方案、定位基准、定位误差的分析计算、工序公差的计算、定位销高度的计算、定位元件材料及机械性能的选用、确定刀具的对刀或引导方式包括:夹紧装置的设计(铰链四杆机构的设计、偏心轮夹紧机构的设计)、夹紧力的作用点和方向、夹紧力的分析和计算、铰链夹紧机构夹紧力的原动力的计算、夹紧元件及传动装置的设计(动力部分的设计和选择、传动装置系统主要参数的计算、控制部分的设计与选择、执行部分的设计与选择、辅助装置的设计与选择
)、确定夹具其他组成部分的结构形式、确定夹具体的形式和夹具的总体结构(夹具体毛坯结构的选择、夹具体的排屑结构、夹具体结构尺寸的确定、夹具体的吊装装置的设计)。
关键词: 夹具,定位,铰链四杆机构,液压,夹紧力
ABSTRACT
The assembly engine bed is along with the productivity's development, and be developed by all-powerful engine bed and appropriation engine bed . It is a kind of high-efficiency special machine tool, which according to the process need of workplace, on the basis of a large number general parts equipped with a few special parts.
The tool machine tongs is an important craft to equip in the machine work piece at tool machine up process, process the accuracy and exaltations to produce the efficiency for the assurance, must make the work piece is on the tool machine the opposite knife has the position of the occupancy exactitude, for e to slice to pare the process in a function but the breakage fixed positions that is subjected to the outside dint, must still to a Clip the tight dint of work.
In the multiple station vertical modular machine tool, which is used to drilling 12 holes of ponents. I select the design of working-holding part, which includes the integral design of working-holding mechanism; the base part design of the working-holding mechanism and the design of hanging drilling template. The working-holding part is made up of the design of orientation schema; the selection of orientation module ; the mistaking analysis of orientation calculating ; the design of bulge-circle mechanism; the design of the four-pole mechanism and the calculating of the original power of the four-pole mechanism; the calc