毕业设计---拔叉80-08的加工工艺及夹具设计

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1、 目录 1 拨叉 80-08 的加工工艺 及夹具设计 目录 2 摘 要 本次设计是车床变速箱中拔叉零件的加工工艺规程及一些工序的专用夹具设 计。此拔叉零件的结构较为复杂，其加工的地方主要是孔和平面。本设计先加工 孔后加工面。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它们的加 工精度。基准选择以拔叉右面的最大的平面作为粗基准，来加工中间的通孔，然 后以此加工过的孔作为精基准。主要加工工序安排是先以中心孔定位加工出顶平 面和右侧平面以及下面的大孔的两平面，再以中心孔定位加工出下端的大孔。加 工时是用镗床镗孔。最后以这两个孔为基准，分别加工右侧的槽和顶面的螺纹底 孔。整个加工过程选用了钻床、

2、铣床和镗床。工件在机床上定位夹紧选用专用夹 具，夹紧方式为手动夹紧，夹紧可靠，操作方便。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 加工工艺，定位，夹紧，专用夹具 目录 3 ABSTRACT This design is a lather to become soon an appropriation for inside pulling out fork spare parts processing craft rules distance and some work prefaces tongs design.This pull out the constr

3、uction of the fork spare parts than for complicacy, its the place that process is a peaceful in bore primarily.This design processes after processing first the bore.Process with flat surface the clear and definite dividing the line the bore the coarseness processes to process with the nicety the sta

4、ge to guarantee their process the precise degree.The basis choice to pull out rough basis of conduct and actions of the biggest flat surface of the right in fork, process the in the center in general use bore, then be used as the precise basis with the bore that processed.Processing primarily work preface arrangement is first to process a flat surface with the center bore fixed position with the right side flat surface and below big bore of two flat surface, again with center