《箱体镗孔夹具设计论文》毕业学术论文.doc

箱体镗孔夹具 摘 要 本次毕业设计内容是对箱体零件一组孔系进行镗孔的夹具设计。在机械加工过程中，为了使零件占据一个正确的位置，从而保证零件的质量，并提高生产效率，所采用的工艺设备称为夹具。 在夹具设计过程中，首先必须满足“六点定位原理”，从而可使零件占据一个正确的位置，保证了加工精度。为了使之达到定位要求，本设计采用了一面两销(一个为圆柱销、另一个为菱形销)的定位方式对零件进行定位，此定位方式避免了过定位现象，提高定位精度，有利于保证加工质量。零件定位后，为了使零件固定并在加工过程中保持定位位置不变，夹具结构就必须有夹紧装置。为了防止零件在夹紧过程中变形，保证加工过程中定位的稳定性，则采用钩形压板为夹紧元件对零件底座进行夹紧。为了保证有足够的夹紧力，动力源装置采用液压缸。考虑到箱体零件外形尺寸比较大，不易装卸，因此在设计时采用了导向装置，即利用导轨。零件在推板定位完成后，利用齿轮齿条机构将其推到所需位置，并利用齿条式定位销对推板进行定位。 本夹具设计的优点有：结构简单实用、安装方便、易更换、造价低廉。 关键词：夹具，镗孔，一面两销，钩形压板，液压缸 CABINET BORING FIXTURE ABSTRACT This graduation project content is the jig design which is carries on to box body components group of holes bores.In machine-finishing process, in order to enable the components to occupy a correct position, thus the guarantee components quality, and enhances the production efficiency, uses the process unit is called the jig. In the jig design process, first must satisfy “six localization principles”, thus may enable the components to occupy a correct position, has guaranteed the processing precision.In order to enable it to achieve the localization request, this design used two has sold (one at the same time for cylindrical pin, another was diamond sells) the locate mode carries on the localization to the components, this locate mode has avoided the localization phenomenon, increased the pointing accuracy, was advantageous in the guarantee processing quality. After components localization, in order to cause the components fixed and maintains in the processing process locates the position to be invariable, the jig structure must have the clamp. In order to prevent deformation of the parts in the clamping process, to ensure the stability of the positioning processing, the use of the hook plate for clamping the clamping elements on the part base. In order to ensure there is sufficient clamping force, the power source device of the hydraulic cylinder.Considered the box body components external dimensions quite are big, not easy to load and unload, therefore in d