ca6140制动杆零件的加工工艺规程及一些工序的专用夹具设计.doc

CA6140制动杆零件的加工工艺规程及一些工序的专用夹具设计

摘   要

本课题最初在翻阅大量资料的前提下完成了调研报告和一篇外文翻译。在调研报告中介绍了机械制造工艺的现状。简单的说明了本次设计的研究内容、研究方法，以及进度安排等，使后续工作可以有条不紊的进行。外文翻译主要关于材料制备在机械设计理论中的新趋势和新问题，在全面综述材料制备机械技术及设备发展动态的基础上,提出了研究领域的几个新问题和发展方向。
本次研究对零件进行合理的工艺设计，包括零件每一道工序的选用设备、切削刀具、切削用量、定位方式等，并要求绘出工序图。另外要求对某夹具进行设计。使学生能把所学的机械制造工艺，金属切削原理及工艺装备设计基础知识系统有机结合起来，为培养学生独立的分析问题和解决问题的能力打下良好基础。
本设计是CA6140制动杆零件的加工工艺规程及一些工序的专用夹具设计。CA6140杠杆零件的主要加工表面是平面及孔。一般来说，保证平面的加工精度要比保证孔的加工精度容易。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的加工精度。基准的选择以杠杆 外圆面作为粗基准，以 孔及其下表面作为精基准。先将底面加工出来，然后作为定位基准，在以底面作为精基准加工孔。整个加工过程选用组合机床。在夹具方面选用专用夹具。考虑到零件的结构尺寸简单，夹紧方式多采用手动夹紧，夹紧简单，机构设计简单，且能满足设计要求。
在本次学习中基本了解夹具设计和原理，夹具方面的基础知识掌握的也得到牢固，进一步明确了设计部件的层次，同时训练了电脑绘图软件在机械设计中的应用。使整体的设计能力得到了很好的提高和锻炼。
关键词：杠杆零件，加工工艺，夹具，定位，夹紧
      

Abstract

At first I have red large amounts of data to complete the research report and a foreign language translation. The research report describes the status of the mechanical manufacturing process. A simple description of the contents of this study design, methods, and the progress of the arrangements. Those are the conditions for work .Foreign language translation mainly about the new trends and new problems in the theory Materials of Mechanical Design. After Summarizing the Materials Mechanical Technology and development of Equipment, it proposed several new areas of research and development issue.
It is a rational design of parts in this study, including equipment, cutting tools, cutting, positioning, etc., and drawing the process diagram. Another requirement is designing a fixture. So that students can learn and combine mechanical manufacturing processes, metal cutting equipment, design principles and basic knowledge of systems technology ,To improve the analysis of problems independent and the skills of solving problem.
This paper is to design the craft processes of making the CA6140 lever spare parts and some specialized tongs in the process. The CA6140 lever spare part primarily processes the surface and bores. Generally speaking, to guarantee the accuracy of the flat surface process is easier than that of the bore. Therefore, this design follows the principle that surface first and then the bore, and definitely divides the process of flat surface and bore into coarse processes and precise processes to guarantee the bore processes. The basic choice is to consider 45 outside circle as rough basis and to consider 25 bore and its next surface as precise basis. The bottom is first processed out to be fixed position basis, and process the bore using the bottom as the precise basis. The whole processes choose the machine bed. In the aspects of tongs choosing, specialized tongs are used. In consideration of the simple construction size of the spare parts, clipping by hands is adopted. It is simple, and the organization design is simple, and can satisfy the design request.
In this study I have learned fixture design and principles, the rudiment of jig have also been acquired firm, at the same time I have a text about the skill of computer designing level, while training in the computer graphics software in the mechanical design. The overall design is a very good capacity to improve and exercise.
Keywords:  Lever spare parts, craft proces , tongs, fixed position, tight clip

目  录

第一章  零件的分析 5
1.1零件的作用 5
1.2零件的工艺分析 5
第二章  工艺规程设计 7
2.1毛坯的制造形式 7
2.2基准面的选择 7
2.3制订工艺路线 8
2.4机械加工余量、工序尺寸及毛坯尺寸的确定 9
2.5确定切削用量及基本工时 10
第三章  专用夹具设计 27
3.1 专用夹具的设计要求 27
3.2夹具设计 27
谢  辞 33
参考资料 34