小支座偏心支座机械加工工艺及镗φ25h7孔夹具设计

1-A3偏心支座零件图

偏心支座机械加工工艺规程和镗φ25H7孔夹具设计

摘要

夹具是零件加工的夹紧装置，是加工零件的一种必不可少的装置。夹具利用率高，经济性好，对功能组件的使用和数量少。随着零件的尺寸变化，越来越多的夹具被淘汰了，因此，设计一套专用夹具是十分有必要的。在设计专用夹具时要考虑工件的定位方案，工件的夹紧方案和设计夹紧机构，夹具的其他组成部分，夹具的结构形式等。
本次设计的题目是偏心支座机械加工工艺规程和镗φ25H7孔夹具设计，根据老师给的图纸要求进行工艺设计和夹具设计，在掌握零件作用的基础上，对零件的工艺进行分析。针对设计给定的题目，设计里面主要对机床夹具进行设计。本夹具体是以保证加工精度，生产效率和便于工人操作为宗旨展开的设计。
设计之初我查阅相关数据及国内外关于机床夹具的文献，在看懂零件图的同时对零件的结构和工艺进行分析，明确粗基准和精基准的选择，确定零件的加工余量与毛坯的尺寸、从而确定零件的加工工艺过程、计算各工序的切削用量及工时。最终完成了本次设计所需的夹具。

关键词：偏心支座；工艺规程；夹具设计
Abstract
Fixture is the clamping device for machining parts, and it is an indispensable device for machining parts. The fixture has the advantages of high utilization rate, good economy and less use and quantity of functional components. With the change of the size of parts, more and more fixtures are eliminated. Therefore, it is necessary to design a set of special fixture. In the design of special fixture, we should consider the positioning scheme of workpiece, the clamping scheme of workpiece and the design of clamping mechanism, the other parts of the fixture, the structure of the fixture, etc..
The design of this topic is eccentric support machining process specification and boring hole 25H7 hole fixture design, according to the drawings given by the teacher requirements of process design and fixture design, on the basis of mastering the role of parts, the process of parts analysis. For the given design topics, the design of the main machine tool fixture design. This clip is designed to ensure the machining accuracy, production efficiency and easy operation for the purpose of the workers.
At the beginning of design I refer to the relevant data and literature at home and abroad on the fixture, structure and process of parts in the read parts map at the same time analysis, clear coarse and fine reference base selection, determine the machining allowance and the size of the blank, so as to determine the parts processing process, calculation of the process of cutting dosage and time. Finally, the fixture needed for the design is completed.

Key words: eccentric support; process specification; fixture design

目录
1.支承座零件分析7
1.1支承座零件的作用7
1.2支承座工艺要求7
2.支承座加工工艺路线8
2.1零件毛坯的选择8
2.2确定各表面的加工工艺方案8
2.3确定定位基准8
2.4加工路线的拟定8
3.机床、刀具、量具选择10
3.1毛坯余量及各加工工序余量、尺寸的相关计算10
3.2切削用量的确定及工时定额10
4.相关工序的夹具设计18
4.1定位夹紧方案18
4.2夹具体与钻模板18
4.3切削力与夹紧力的分析与计算18
4.4误差分析与计算19
4.5夹具设计及操作的简要说明19
结论20
致谢21
参考文献22

A1夹具体

A1镗孔装配图

A3偏心支座毛坯图