机械制造工艺学课程设计-活塞杆机械加工工艺规程设计

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1、机械制造工艺学课程设计说明书设计题目:活塞杆机械加工工艺规程设计学院：机电工程学院班级：机械设计制造及其自动化二班学生：学号：指导教师：目录1零件的分析·······················································11.1零件结构工艺性分析··············································11.2零件的技术要求分析··············································12毛坯的选择··············

2、·········································22.1毛坯的选择及毛坯制造方法的选择··································22.2毛坯形状及尺寸的确定···········································23工艺路线的拟定···················································23.1定位基准的选择················································

3、··23.2零件表面加工方案的选择··········································33.3加工顺序的安排··················································33.3.1加工阶段的划分················································43.3.2工序的集中与分散··············································43.3.3机械加工顺序的安排··············

4、······························43.3.4热处理工序的安排··············································43.3.5辅助工序的安排···············································54工序设计·························································64.1机床和工艺装备的选择···········································

5、·64.2工序设计························································6结论······························································11参考文献···························································121.零件的分析1.1零件结构的工艺性分析（1）mm×770mm自身圆度公差为0.005mm（2）左端螺纹与活塞杆mm中心线的同轴度公差为φ0.05

6、mm(3)1:20圆锥面轴心线与活塞杆mm中心线的同轴度公差为φ0.02mm(4)1:20圆锥面自身圆跳动公差为0.005mm(5)1:20圆锥面涂色检查，接触面积不小于80%(6)mm×770mm表面渗氮，渗氮层深度0.2-0.3表面硬度62一65HRC1.2零件的技术要求分析（1）活塞杆在使用过程中，承受交变载荷作用，mm×770mm处有密封装置往复摩擦表面，所以该处工艺要求硬度高又耐磨。活塞杆采用38CrMoAlAn材料，mm×770mm部分经过调质处理和表面渗碳处理，芯部硬度为23-32HRC,表面渗氮层深度0.2-0.3mm

7、,表面硬度62-65HRC，所以活塞杆既有一定的韧性，又具有较好的耐磨性。(2)活塞杆结构比较简单，长径比大，属于细长轴类零件。刚性较差，为了保证加工精度，在车削时要粗车、精车分开，而且粗、精车一律使用跟刀架，以减少加加工时工件变形，在加工两端螺纹时使用中心架。（3）在选择定位基准时，为了保证零件同轴度公差及各部分的相互位置精度，所有的加工工序均采用两中心孔定位，使之符合基准统一原则。（4）磨削外圆表而时，工件易产生让刀、弹性变形，影响活塞杆的精度。因此，在加工时应修研中心孔，保证中心孔清洁，中心孔与顶尖间松紧程度要适宜，并保证良好的

8、润滑。砂轮一般选择:磨料白刚玉(WA)，粒度60#，硬度中软或中、陶瓷结合剂，另外砂轮宽度应选窄些，以减小径向磨削力，加工时注意磨削用量的选择，磨削深度要小。（5）在磨削中mm×770mm外圆和1:20锥度时，两道工序序