摘要 这次设计的是总泵缸体。包括零件图、毛坯图、装配图各一张，机械加工工艺过程卡片和与工序卡片各一张。根据零件的性质和零件图上各端面的粗糙度确定毛坯的尺寸和机械加工余量。最后制定该工件的夹紧方案，画出夹具装配图。 机械制造工艺学课程设计是我们学完了大学的全部基础课、技术基础课以及大部分专业课之后进行的.这是我们在进行设计之前对所学各课程的一次深入的综合性的总复习,也是一次理论联系实际的训练,因此,它在我们四年的大学生活中占有重要的地位。 就我个人而言，我希望能通过这次课程设计对自己未来将从事的工作进行一次实际的训练，从中锻炼自己分析问题、解决问题的能力。由于能力所限，设计尚有许多不足之处，恳请各位老师给予指导。 Abstract The master cyli
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nce to teachers. 目录 1、零件分析6 1.1零件工作原理6 1.2零件工艺分析7 2、工艺规程设计7 2.1确定毛坯制造形式7 2.2基面选择7 2.2.1加工阶段的划分8 2.2.2工序的集中与分散8 2.3工艺路线8 2.4计算两次工序尺寸的基本尺寸10 3、时间定额的计算10 3.1两工步时间定额的计算10 3.2辅助时间的计算11 4、机械加工余量，工序尺寸及毛坯尺寸的确定11 5、确定切削用量及工时13 5.1车13 5.2铣端面14 5.3钻14 5.4钻螺纹孔15 6、夹具设计15 6.1定位基准选择15 6.2定位误差分析15 7、方案综合评价与结论16 8、体会与展望16 9、参考文献17 1、零件的工艺性分析 1.1零件工作原理 题目所给定的零件是总泵缸体。是整个液压系统的核心，作用是通过活塞的来回往复运动产生推动工作缸动作所需的油压。该零件ф3.5为进油孔，活塞运动过该位置时，完成充油过程，活塞继续运动将油推向前方，挤压出缸体，由于截面积差产生工作压力。当活塞回程时超过3.5孔位时开始进油，旁边小孔为空气孔，方便进空气。