机械原理课程设计

说明书

设计题目：螺钉头冷镦机 学 院：机电与建筑工程学院 专业班级：机制1011班 学生姓名：

学 号：201006101106 指导老师：

第- 1 -页 共14页

日 期：2012年6月29日

第- 2 -页 共14页

目录

1、设计题目···················································3 1.1. 工作原理及工艺动作过程·································3 1.2 原始数据及设计要求·····································3 1.3 设计方案提示···········································3 1.4 设计任务···············································3 2、设计方案··················································4 2.1方案一·················································4 2.1.1 机构类型·············································4 2.1.2 机械运动原理：·····································4 2.1.3 机构的优缺点······································4 2.2方案二·················································5 2.2.1 机构类型··········································5 2.2.2 机械运动原理······································5 2.2.3 机构的优缺点······································5 2.3方案三·················································6 2.3.1 机构类型··········································6 2.3.2 机械运动原理······································6 2.2.3 机构的优缺点······································7 3、设计方案的比较和选择······································8 4、设计计算··················································9 4.1 基本参数设计···········································9 4.1.1 凸轮的具体设计·····································9 4.1.2 槽轮的具体设计····································10 4.1.3 冷镦机构的具体设计································11 4.2 运动循环图············································11 4.3 传动机构··············································13 5、设计心得及体会············································13 6、参考文献··················································13

第- 3 -页 共14页

1、设计题目

螺钉头冷镦钉

1.1. 工作原理及工艺动作过程

采用冷镦的方法将螺钉头镦出，可以大大减少加工时间和节省材料。冷镦螺钉头主要完成以下动作：

1）把成卷的线材通过校直，并自动间歇送料； 2）截料并运料； 3）预镦和终镦； 4）顶料。

1.2 原始数据及设计要求 1）每分钟冷镦螺钉头120只。

2）螺钉杆的直径D=2～4mm，长度L=6～32mm。 3）毛坯料最大长度48mm，最小长度12mm。 4）冷镦行程56mm。 1.3 设计方案提示

1）自动间歇送料采用槽轮机构、凸轮式间隙运动机构等。 2）将坯料转动切割可采用凸轮机构推动进刀。

3）将坯料用冲压机构在冲模内进行预镦和终镦，冲压机构可采用平面四杆机构或六杆机构。

4）顶料，采用平面连杆机构等。 1.4 设计任务

1）按工艺动作要求拟定运动循环图。

2）进行自动间歇送料机构、截料送料机构、预镦终镦机构、顶料机构的选型。

3）机械运动方案评价和选择。

4）按选定的电动机和执行机构的运动参数拟定机械传动方案。 5）画出机械运动方案简图。

6）对传动机构和执行机构进行运动尺寸计算。

第- 4 -页 共14页