基于ug变速齿轮箱体数控加工生产线设计.doc

基于UG变速齿轮箱体数控加工生产线设计

摘  要

    加工中心简称CNC。是一种由机械设备与数控系统组成的使用于加工复杂形状工件的高效率自动化机床。加工中心的突出特点为加工工序集中和能够实现自动换刀，对于形状复杂、精度要求较高和要求换刀频繁的零件的加工能够提高生产效率、缩短生产周期以获得较好的经济效果。

本次设计针对的零件为三星齿轮箱体，形状复杂、有一定的精度要求并且加工工序较多，因而选择在加工中心上加工很合适。

设计首先用UG软件绘制零件图、毛坯图，然后对零件进行分析，确定合适的加工工序，根据工序选择相应的定位基准，制定加工工艺，选择切削用量并计算基本工时，用AutoCAD绘制加工工艺综合卡，用UG导出其中一道工序的数控加工G代码，选择两道加工工序设计夹具并用CAD绘制夹具装配图。

    关键词：三星齿轮箱体；工艺；工序；加工中心；夹具

UG-based Design of CNC Machining Production Line of the Gear Box 

ABSTRACT

    Processing center referred to as CNC. Composed by mechanical equipment and numerical control systems used for processing complex shape of workpiece, CNC is a kind of high efficiency automation machine tools. Processing operations focused and able to achieve automatic tool change is a prominent characteristic of the machining center. When used to process workpieces which are of complex shape, of high accuracy and require for frequent tool change, it can improve production efficiency, shorten the production cycle in order to obtain better economic effects.

This design is for part——Norton gear box who have complex shape, certain degree of accuracy and more processing process.So it is relatively appropriate to process in the processing center.

The first step of this design is to use UG to draw the part drawing, blank drawing and process work preface diagram. Then analysing the part so as to determine appropriate manufacturing procedure, using the UG software export procedure of NC machining process, selecting the appropriate location basis to develop a process route, choosing processing equipment and tools, fixtures, measuring, and calculating each procedure of the basic working hours, drawing processing process card. Finalize the fixture design of two process and complete the fixture drawings with CAD. 

KEY WORD: Norton gear box；technology；process；processing center;

           fixture

目录

前  言 iv

第 1 章 零件分析 1

1.1. 零件作用分析 1

1.2. 零件工艺分析 2

第 2 章 确定毛坯尺寸 3

2.1. 确定毛坯尺寸 3

第 3 章 工艺过程设计 4

3.1. 定位基准的选择 4

3.2. 制定工艺路线 4

3.3. 选择加工设备及刀具 6

3.4. 加工工序设计 12

第 4 章 三星齿轮箱体夹具设计 30

4.1. 夹具设计的相关要求 30

4.2. 定位夹紧方案的确定 30

4.3. 切削力及夹紧力的分析 32

4.4. 定位误差分析 37

第 5 章 铣削下底面G代码 39

第 6 章 结  论 45

参考文献 46

致  谢 47