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1、沈阳理工大学应用技术学院毕业设计说明书I摘 要此次设计是对拨叉零件的加工工艺和夹具设计，其零件为锻件，具有体积小，零件复杂的特点，由于面比孔易加工，在制定工艺规程时，就先加工面，再以面为基准来加工其它，其中各工序夹具都采用专用夹具，特别的对于加工大头孔、槽和钻小头孔斜面小孔的工序中，选一面两销的定位方式，并以操作简单的手动夹紧方式夹紧，其机构设计简单，方便且能满足要求。由于零件的形状复杂，尺寸比较大，加工精度，位置精度等要求较高，所以为了保证该零件的精度的要求，用专用机床，用专用夹具来进行加工，这样不仅能保证零件的尺寸、位置等精度要求，而且装夹一次无需在装夹，这样明显缩短了装夹时间，也提高了生
2、产率和经济效益。整个加工过程中的特点是专用机床，减少了装夹次数，保证了加工精度，节省时间、效率高。对于零件加工工艺设计中包括：毛坯的选择、基准的选择、拟定机械加工工艺路线、确定机械加工余量、工序尺寸及公差、选择机床设备及工艺装备、确定某工序的 切削用量及基本工时等设计，在加工中要使用专用夹具，包括对定位方案、定位元件、夹紧力的计算、夹具中用的非标准件、夹具体等几方面的设计。因为在加工中用到量具。在设计中能够运用加工工艺所遵循的原则进行设计。关键词 拨叉;加工工艺;专用夹具;设计沈阳理工大学应用技术学院毕业设计说明书IIABSTRACTThis design is to dials forks
3、the components the processing craft and the jig design, its components are the forging, has the volume to be small, components complex characteristic,Because the surface is easier than the hole to process, when formulation technological process, first the machined surface, then processes other take
4、the surface as the datum,In which various working procedures jig all uses the unit clamp, special regarding processes the big end of hole, the trough and drills the capitellum hole incline eyelet in the working procedure, Chooses locate mode which two sells at the same time, and operates the simple
5、manual clamp way clamp, its organization design is simple, the convenience also can satisfy the request.Due to the complex shape and parts a larger size, machining precision and position precision high demands, so to ensure that the parts of the accuracy requirement of the special machine, use, with
6、 special jig to carry on the processing, so can not only ensure part size, such as the position accuracy requirement, and clamping once in clamping, without this obvious shortened clamping time, increase productivity and economic benefits.The whole process, characteristic is a special machine, reduc
7、e the clamping times, to ensure the machining accuracy and save time and high efficiency.For parts processing technology design include: blank selection, the benchmark selection, worked out the machining process route, determine the mechanical machining allowance, procedure sizes and tolerance, choi
8、ce of machine tool equipment and process equipment, determine a process of cutting dosages and basic design, processing man-hour to use special jig, including to positioning scheme, positioning components, clamping force calculation, jig using the non-standard fasteners, clip specific aspects of the
9、 design. Because in processing used in measuring tool. In the design can use processing technologys principle to carry on the design.Key words Dials the fork, the processing craft, unit clamp, design沈阳理工大学应用技术学院毕业设计说明书 1目 录摘 要 IABSTRACT绪 论 11 拨叉的分析 22.1 拨叉的工艺分析 22.2 拨叉的工艺要求 22 工艺规程设计 53.1 加工工艺过程 53.2 确定各表面加工方案 53.2.1 影响加工方法的因素 53.2.2 加工方案的选择 63.3 确定定位基准 63.3.1 粗基准的选择 63.3.1 精基准选择的原则 73.4 工艺路线的拟订 83.4.1 工序的合理组合 83.4.2 工序的集中与分散 83.4.3 加工阶段的划分 93.4.4
