前横架加工工艺及钻4-M12底孔夹具设计【CAD图纸和说明书】

摘　要

本文主要介绍钻前横架上螺纹孔的工艺分析，怎样确定零件的生产类型，怎样拟定生产路线及工艺文件的编制。其中工艺卡片的绘制尤为重要。设计内容主要是夹具的设计。六点定位原理的应用在此得到应用。夹紧装置的设计应遵循夹紧力的基本原则——作用点、方向、大小。夹具是为满足机械加工工艺要求而进行的一种工装设计，同时它又是一项较为独立的生产实用技能。本课程的学习需要有机床、刀具、公差与技术测量、机械制图、工程材料及热处理、机械原理与机械零件、理论力学及材料力学等机械专业多门专业基础课程做支撑。

通过此次课程设计能够掌握机床夹具的基本理论知识和设计计算方法，能对机床夹具进行结构设计和精度分析。 会查阅有关夹具设计的标准、手册、图册等技术资料。 掌握机床夹具设计的一般方法，具有设计一般复杂程度夹具的基本能力。 了解现代夹具设计的一般知识。

Abstract

In this paper, drilling holes before Hengjia thread on the process of determining what type of parts production and how to develop the production line and the preparation of documents. One of the drawing cards is particularly important. Design is the main content of the fixture design. 6:00 targeting the application of this principle be applied. Clamping devices should be designed to follow the basic principles of force clamping - role, direction and size. Fixture for mechanical processing technology to meet the requirements of a tooling design, it is a relatively independent production practical skills. This course of study and the need for machine tools, knives, tolerance and measurement technology, mechanical drawing, engineering materials and heat treatment, machinery and mechanical parts theory, theory of mechanical machinery and materials, such as professional mechanics and more professional support to do basic courses.

  Through this curriculum design to be able to master the basic machine fixture theoretical knowledge and design methodology can be a fixture on the structural design of machine tools and precision analysis. Will have access to the fixture design standards, manuals, plans for technical information. Machine Tool fixture design master the general approach, with the general complexity of the design of the basic ability fixture. Fixture design of the modern understanding of general knowledge.

1 前横架的工艺分析及生产类型的确定1

1.1前横架的技术要求1

1.2前横架的工艺分析1

1.3确定前横架的生产类型1

2 确定毛坯、绘制毛坯简图1

2.1选择毛坯1

2.2毛坯的尺寸公差和机械加工余量2

2.3绘制前横架铸造毛坯结构简图2

3 拟定前横架工艺路线3

3.1定位基准的选择3

3.1.1精基准的选择3

3.1.2粗基准的选择3

3.2表面加工方法的确定3

3.3加工阶段的划分4

3.4工序的集中与分散4

3.5工序顺序的安排4

3.6确定工艺路线5

4 加工余量、工序尺寸和公差的确定5

4.1工序1—前横架前面加工余量、工序尺寸和公差的确定5

4.2工序4—凸起螺纹孔（M12）的加工余量、工序尺寸及公差的确定6

5切削用量的计算6

5.1钻孔6

5.2攻螺纹7

6 夹具设计7

6.1确定工件的定位方案7

6.2计算定位误差7

6.3 导向元件设计8

6.4夹紧装置的选择8

6.4.1夹紧装置的组成8

6.4.2夹紧基本要求8

6.5 夹具体的设计9

6.5.1夹具体设计的基本要求9

6.5.2夹具体材料及制造方法9

参考文献10