设计简介
摘 要
本设计是基于拨叉零件的加工工艺规程及一些工序的专用夹具设计。拨叉零件的主要加工表面是平面及孔系。一般来说，保证平面的加工精度要比保证孔系的加工精度容易。因此，本设计遵循先面后孔的原则。并将孔与平面的加工明确划分成粗加工和精加工阶段以保证孔系加工精度。基准选择以拨叉的输入轴和输出轴的支承孔作为粗基准，以顶面与两个工艺孔作为精基准。主要加工工序安排是先以支承孔系定位加工出顶平面，再以顶平面与支承孔系定位加工出工艺孔。在后续工序中除个别工序外均用顶平面和工艺孔定位加工其他孔系与平面。支承孔系的加工采用的是坐标法镗孔。整个加工过程均选用组合机床。夹具选用专用夹具，夹紧方式多选用气动夹紧，夹紧可靠，机构可以不必自锁，因此生产效率较高，适用于大批量、流水线上加工，能够满足设计要求。
关键词：拨叉类零件；工艺；夹具；
Abstract
This design is the special fixture for machining process of forked plectrum parts and process design based on. The main processing surface fork parts of the plane and a series of hole. In general, ensure the machining accuracy of plane than to ensure machining accuracy hole easily. Therefore, the design follows the surface after the first hole of the principle. And the hole and the plane processing clearly divided into roughing and finishing stages of processing to ensure the accuracy of the hole. The supporting hole of the input shaft and the output shaft of the benchmark by a shifting fork as a rough benchmark, the top two holes as a precision technology base. Main processing process arrangement is to support hole positioning processing the top plane, and then the top plane and the series of supporting hole location hole processing technology. In addition to the follow-up processes individual processes are used in the top plane positioning technology and other processing Kong and plane. The supporting hole processing system using the method of coordinate boring. The whole process selection of combined machine tool. The special fixture fixture, clamping means more choice of pneumatic clamping, clamping reliable, agencies can not self-locking, therefore the production efficiency is higher, suitable for high-volume, line processing, can meet the design requirements.Key Words: fork parts; technology; fixture;
目 录
摘 要... IIAbstract III
目 录... IV
第1章 绪论... 1
1.1 机械加工工艺概述... 1
1.2机械加工工艺流程... 1
1.3夹具概述... 2
1.4机床夹具的功能... 3
1.5机床夹具的发展趋势... 3
1.5.1机床夹具的现状... 3
1.5.2现代机床夹具的发展方向... 4
第2章 零件的工艺性分析... 5
2.1零件的作用... 5
2.2零件的工艺分析... 6
第3章 工艺规程设计... 7
3.1确定毛坯的制造形成... 7
3.2基准的选择... 8
3.3制定工艺路线... 8
3.4机械加工余量、工序尺寸及毛坯尺寸的确定... 10
3.5确定切削用量及基本工时... 11
第4章 设计铣左端面的夹具设计... 22
4.1 提出问题... 22
4.2 夹具设计... 22
4.2.1 定位基准的选择... 22
4.2.2 定位误差的分析... 22
4.2.3 铣削力及夹紧力计算... 22
4.2.4 夹具设计说明... 23
结 论... 24
参 考 文 献... 25
致 谢... 26
