1、 课 程 设 计 题 目： 定位小轴零件的机械加工工艺规程及加 工8 孔的工艺装备设计 1 摘要摘要 CA6140 车床的拨叉位于车床变速机构中，主要起换档， 使主轴回转运动按照工作者的要求工作，获得所需的速度和 扭矩的作用。零件上方的 22 孔与操纵机构相连，二下方的 50 半孔则是用于与所控制齿轮所在的轴接触。通过上方的 力拨动下方的齿轮变速。 在此设计中，考虑到了拨叉形状的不规则，这就使得通 用夹具在这里不能用。为此，只有设计符合此拨叉夹紧要求 的专用夹具。由于该拨叉的材料是 HT200 的铸件，因此在刀 具选择方面，要求就比较低了。 因为该拨叉为中批量生产，因此在加工过程中，可以采 用
2、加工工序分散的工艺路线，从而提高生产效率。 由于 50 半孔两个端面的磨损比较严重，因此对这两个 表面， 采用表面淬火的热处理工序来改善断端面的力学性能。 2 AbstractAbstract The CA6140 lather stir fork to be located on lather to become soon in the organization, main shift gear, make the principal axis turn round sport according to the worker of request work, acquire the spee
3、d need and twist the function of Ju.Spare parts above of 22 bores with manipulate organization connect with each other, two under of 50 half bores then used for with the stalk of the wheel gear place control contact.Pass above of the dint turn under of the wheel gear become soon. In this design, in
4、consideration of stir the anomaly of fork shape, this cant make the in general use tongs use here.Is this, only the design match this stir fork to clip important beg of appropriation tongs.Because should stir the material of fork is the Zhu piece of HT200, therefore at knife choice aspect, request lower. Should stir fork for medium the batch quantity produce, so in the process of process in, can adoption craft route that process work prefaces dispersion, thus exaltation produce effic
