阀体说明书

桂林航天工业高等专科学校

毕业设计说明书

课题：机械阀体工艺规则及铣,钻夹具设计

专业：机械制造与自动化

班级：一班

姓名：胡德松

学号：200903620109

指导老师：徐冠

目录

摘要 (1)

Abstract (2)

第1章绪论 (3)

1.1课题背景 (3)

1.2夹具的发展史 (3)

1.3小结 (4)

第2章零件的分析 (5)

2.1零件的作用 (5)

2.2零件的工艺分析 (5)

第3章工艺规则设计 (6)

3.1确定毛坯的制造形式 (6)

3.2毛坯的设计 (6)

3.3选择定位基准 (7)

3.3.1 精基准的选择 (7)

3.3.2 粗基准的选择 (8)

3.4制定工艺路线 (9)

3.4.1 工序的合理组合 (9)

3.4.2 工序的集中与分散 (9)

3.4.3 加工阶段的划分 (10)

3.4.4 工艺路线 (11)

3.5机械加工余量、工序尺寸及毛坯尺寸的确定 (13)

第4章确定切削用量及工时 (15)

第5章夹具设计 (25)

5.1设计夹具的目的 (25)

5.2夹具的分类 (25)

5.3专用夹具的组成 (27)

5.4典型的定位元件 (27)

5.5夹具中的夹紧机构 (29)

5.6夹具的发展趋势 (30)

5.7本课题夹具设计 (31)

5.7.1 问题的提出 (31)

5.7.2 定位基准的选择 (32)

5.7.3 切削力及夹紧力计算 (32)

5.7.4 定位误差分析 (33)

5.7.5 定向键与对刀装置设计 (34)

5.7.6 夹具设计及操作简要说明 (36)

结论 (37)

致谢 (38)

参考文献 (39)

摘要

本次设计内容涉及了机械制造工艺及机床夹具设计、金属切削机床、公差配合与测量等多方面的知识。

阀体加工工艺规程及其钻孔的夹具设计是包括零件加工的工艺设计、工序设计以及专用夹具的设计三部分。在工艺设计中要首先对零件进行分析，了解零件的工艺再设计出毛坯的结构，并选择好零件的加工基准，设计出零件的工艺路线；接着对零件各个工步的工序进行尺寸计算，关键是决定出各个工序的工艺装备及切削用量；然后进行专用夹具的设计，选择设计出夹具的各个组成部件，如定位元件、夹紧元件、引导元件、夹具体与机床的连接部件以及其它部件；计算出夹具定位时产生的定位误差，分析夹具结构的合理性与不足之处，并在以后设计中注意改进。

关键词：工艺、工序、切削用量、夹紧、定位、误差。

Abstract

This design content has involved the machine manufacture craft and the engine bed jig design, the metal-cutting machine tool, the common difference coordination and the survey and so on the various knowledge.

Body process planning and drilling fixture was designed to include part machining process design, process design, and dedicated fixture design of three parts. In process design, analysis of the part must first understand the parts of the process re-engineering the structure of a blank, and select a good part of the processing of the base to design parts process route; followed by the various working steps on the part of the procedures for the size of the calculation, the key is to determine the various stages of work out of process equipment and cutting consumption; then dedicated fixture design, selection of design out of all the component parts fixture, such as the positioning components, clamping components, guiding elements, the specific folder connection with the machine parts and other components; calculate the positioning fixture positioning error generated, analysis fixture structure is reasonable and deficiencies, and attention to improving the design in the future.

Keywords: The craft, the working procedure, the cutting specifications, clamp, the localization, the error