本科毕业设计CA6140车床后托架加工工艺及夹具设计学生姓名： 齐峰学生学号： 080514020510 院 （系）： 机械工程学院 年级专业： 机械设计制造及自动化指导教师： 芦玉梅二一二年六 / 摘 要机械加工工艺是规定产品或零件机械加工工艺过程和操作方法，是指导生产的重要的技术性文件。它直接关系到产品的质量、生产率及其加工产品的经济效益，生产规模的大小、工艺水平的高低以及解决各种工艺问题的方法和手段都要通过机械加工工艺来体现，因此工艺规程的编制的好坏是生产该产品的质量的重要保证的重要依据。在编制工艺时须保证其合理性、科学性、完善性。而机床夹具是为了保证产品的质量的同时提高生产的效率、改善工人的劳动强度、降低生产成本而在机床上用以装夹工件的一种装置，其作用是使工件相对于机床或刀具有个正确的位置，并在加工过程中保持这个位置不变。它们的研究对机械工业有着很重要的意义，因此在大批量生产中，常采用专用夹具。 关键词: 工艺规程；刀具；夹具AbstractThe machining process is a regulation products or parts machining process and operation method, is guiding the production of important technical documents. It directly related to the quality of the products, productivity and its processing products economic benefits, the size of the production, process of level and process problems to solve all the methods and means of the machining technology to manifest, so the stand or fall of the procedure for the quality of its products is the important guarantee of the important basis. Compiling process should ensure that its rationality, scientific and perfect sex. And machine tool is to ensure that the product of the fixture the quality at the same time improve the production efficiency, improve the labor intensity, reduce production cost and in the machine tool used to clamping work-piece, a device, and its function is to make the work relative to the machine or knife has a correct position, and in the machining process keep this position unchanged. Their research of mechanical industry has a very important significance in mass production, therefore, often use special jig. Keywords: Procedure; Cutting tool ; Fixture目 录摘 要IABSTRACTII第1章 绪论11.1 机械加工工艺规程11.2 工艺规程制订的原则11.3 制订工艺规程时的原始资料21.4 制订工艺规程的步骤21.5 工艺文件格式31.5.1 机械加工工艺过程卡31.5.2 机械加工工艺卡片31.5.3 机械加工工序卡片31.6 夹具设计的基本要求4第2章 CA6140机床后托架加工工艺编制52.1 CA6140机床后托架的工艺性分析及毛坯的选择52.1.1 CA6140机床后托架结构的工艺性52.1.2 CA6140机床后托架的技术要求52.1.3 CA6140机床后托架毛坯的选择62.2 加工工艺过程的设计62.2.1 工艺过程的组成62.2.2 定位基准的选择72.2.3 加工阶段的划分82.2.4 各表面加工方案的确定102.2.5 工序的集中与分散112.2.6 加工工艺路线方案的比较122.3 加工的工序设计142.3.1 毛坯的结构工艺要求142.3.2 加工余量及工序尺寸的确定142.3.3 机床和工艺装备的选择172.3.4 确定切削用量及基本工时182.4 时间定额计算及生产安排322.4.1 粗、精铣底面322.4.2 镗侧面三杠孔322.4.3 钻顶面四孔33第3章 专用夹具设计353.1 铣平面夹具设计353.1.1 研究原始资料353.1.2 定位基准的选择353.1.3 切削力及夹紧分析计算353.1.4 误差分析与计算373.1.5 夹具设计及操作的简要说明373.2 镗孔夹具设计383.2.1 研究原始资料383.2.2 定位基准的选择383.2.3 切削力及夹紧力的计算383.2.4 误差分析与计算40结 论41致 谢42参考文献43CONTENTSABSTRACTIICHAPTER 1 INTRODUCTION11.1 Machining process planning11.2 The principle of technicolgical regulations formulation11.3 The original data when formulation technicolgical regulations21.4 The steps of technicolgical regulations formulation21.5 Process file format31.5.1 Machining technology process card31.5.2 Machining process card31.5.3 Machining procedure card31.6 Basic requests of tongs design5CHAPER 2 CA6140 MACHINING PROCESS PLANNING OF MACHINE BRACKET52.1 Process analysis and the choice of rough of CA6140 machine after the bracket52.1.1 Structure of the process for CA6140 machine bracket52.1.2 Technical requirements for CA6140 machine bracket52.1.3 Choice of rough for CA6140 machine bracket62.2 Machining process design62.2.1 The composition of the process62.2.2 The choice of locating datum72.2.3 Division of processing stages82.2.4 Definition of processing program92.2.5 Centralization and decentralization for process112.2.6 The camparation of processing line program112.3 The process design of the processing132.3.1 Process requirements of rough structure132.3.2 Definition of allowances and the process sizes142.3.3 The choice of machine tools and process equipment172.3.4 Determining the cutting parameters and basic working hours182.4 Time fixed terms and production arrangements312.4.1 Underside of roughing and finishing322.4.2 Three holes in the boring side322.4.3 Four holes of drill the top surface33CHAPTER 3 THREE DEDICATED FIXTURE DESIGN353.1 Milling fixture design353.1.1 The study of the original material353.1.2 Options of positioning benchmark353.1.3 The cutting force and analysis of clamping353.1.4 Error analysis and calculation373.1.5 Fixture design and a brief description of operation373.2 Boring fixture design383.2.1 The study of the original material383.2.2 Options of positioning benchmark383.2.3 The cutting force and analysis of clamping383.2.4 Error analysis and calculation40CONCLUSIONS41ACKNOWLEDGEMENTS42REFERENCES43第1章 绪论1.1 机械加工工艺规程机械加工工艺规程是规定零件机械加工工艺过程和操作方法的工艺文件。它是机械制造工厂最主要的技术文件。其具体作用如下。工艺规程是指导生产的主要技术文件，是指挥现场生产的依据对于大批大量生产的活件，由于生产