摘要本文主要是对连杆盖（跑偏件）进行车削加工的方法设计。结合目前实际生产中，常常发现半圆孔型零件不易找到圆心，加工困难的问题。采用车床四爪卡盘设计了一种合理的加工方法并基于此原理设计了专用的夹具来提高生产效率，减少材料的浪费。四爪卡盘方法加工主要包括原理设计，工装设计以及在普通车床上的具体加工方法。柔性专用夹具设计包括了定位夹紧的选择，夹具结构的方案设计以及合理性分析。43918

本设计的实用性比较强，不仅仅是在针对连杆盖（跑偏件）加工时才可以用到，而是在加工所有半圆孔零件而无法找到圆心时，都可以尝试用此方法进行解决。从而避免了很多因为工件的损坏无法找到合理的方法进行修复造成的不必要的损失和浪费，增加了成本。因此，本方法的设计具有其实在意义和价值，可以解决很多在实际加工生产当中的问题。

毕业论文关键词：车削加工；半圆孔；四爪卡盘；专用夹具

Abstract This paper is mainly about the design of the turning of the connecting rod cap (deviation pieces). In combined with the actual production ,semicircle hole part is not easy to find the center of the circle and difficult to process. Lathe four-jaw chuck design a reasonable processing methods and design based on this principle a special fixture to improve production efficiency and reduce material waste. The four-jaw chuck processing methods including the principles of design, tooling design, as well as specific processing methods on the lathe. Flexible dedicated fixture design includes a choice of locating and clamping fixture structure design and a reasonable analysis.

The practicality of this design, not only in processing only for the connecting rod cap (deviation pieces) can be used, but in processing all the half-hole parts were unable to find the center of a circle, we can try to use this method to resolve. Thus avoiding a lot because of damage to the workpiece can not find a reasonable method of repair caused by the unnecessary loss and waste, increasing the cost. Therefore, the design of this method has in fact the meaning and value, you can solve many problems in which the actual processing.

Keywords：Turning operations, semi-circular hole,four-jaw chuck, special fixtures

目录

第一章  绪论 1

1.1 课题背景 1

1.1.1 机床概述 1

1.1.2 机床夹具 1

1.2 课题设计内容及任务 3

第二章  普通车床四爪卡盘加工 4

2.1 车床概述 4

2.2 普通车床加工 6

2.2.1 连杆盖跑偏件分析 6

2.2.2 车削加工方法的设计 8

2.2.3 车削加工刀具的选择 11

2.3 车削力的的计算 12

2.3.1 车削力概述 12

2.3.2 端面切削力的估算 14

2.3.3 镗孔切削力的估算 16

第三章  基于普通车床加工原理的专用夹具设计 20

3.1 车床夹具概述 20

3.2 夹具设计 20

3.2.1 夹具的设计要求 20

3.2.2 夹具定位方案的选择 20

3.2.3 夹具夹紧装置的选择