变速叉钻19孔夹具及三维设计【SW2021】.rar

I摘 要本设计是基于汽车拨叉零件的加工工艺规程及一些工序的专用夹具设计。汽车拨叉零件的主要加工表面是平面及孔系。一般来说，保证平面的加工精度要比保证孔系的加工精度容易。因此，本设计遵循先面后孔的原则。并将孔与平面的加工明确划分成粗加工和精加工阶段以保证孔系加工精度。主要加工工序安排是先以支承孔系定位加工出顶平面，再以顶平面与支承孔系定位加工出工艺孔。在后续工序中除个别工序外均用顶平面和工艺孔定位加工其他孔系与平面。支承孔系的加工采用的是坐标法镗孔。整个加工过程均选用专用夹具，夹紧方式多选用手动夹紧，夹紧可靠，机构可以适当设计成自锁，因此生产效率较高，适用于大批量、流水线上加工，能够满足设计要求。关键词：汽车拨叉零件；工艺；夹具；ABSTRACTThis design is the special fixture for machining technology for the chemical pipeline parts and process design based on.The main processing surface chemical pipeline parts is the plane and a series of hole.In general,ensure the machining accuracy of plane than to ensure the accuracy of the processing easily.Therefore,the design follows the surface after the first hole principle.And the hole and the plane processing clearly divided into roughing and finishing stages to ensure machining precision.The main process of machining technology is first to support hole positioning processing the top plane,and then the top plane and the series of supporting hole location hole