齿爪式21窄机体车中心孔端面夹具设计(全套设计含CAD图纸)
齿爪式21窄机体车中心孔端面夹具设计(全套设计含CAD图纸),齿爪式,21,机体,中心,端面,夹具,设计,全套,cad,图纸
I 四川职业技术学院 Sichuan Vocational and Technical College 毕业设计(论文) 题 目 齿爪式 21 窄机体加工工艺及(车中心孔端面)夹具设计 所属系部 机械工程系 所属专业 机械设计与制造 所属班级 学 号 学生姓名 指导教师 起讫日期 2012.092013.04 四川职业技术学院教务处制 3 摘 要 齿爪式 21 窄机体零件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。基准选择以变速 箱箱体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。 本文是对齿爪式 21 窄机体零件加工应用及加工的工艺性分析,主要包括对零件图 的分析、毛坯的选择、零件的装夹、工艺路线的制订、刀具的选择、切削用量的确定、 加工工艺文件的填写。选择正确的加工方法,设计合理的加工工艺过程。此外还对零 件的两道工序的加工设计了专用夹具. 机床夹具的种类很多,其中,使用范围最广的通用夹具,规格尺寸多已标准化, 并且有专业的工厂进行生产。而广泛用于批量生产,专为某工件加工工序服务的专用 夹具,则需要各制造厂根据工件加工工艺自行设计制造。本论文夹具设计的主要内容 是设计车中心孔端面夹具。 关键词:齿爪式 21 窄机体,加工工艺,加工方法,工艺文件,夹具 4 Abstract 21 double rotor body parts parts of the main plane of the surface and pore system. In general, the plane guarantee processing precision than that of holes machining precision easy. Therefore, this design follows the surface after the first hole principle. Plane with holes and the processing clearly divided into roughing and finishing stages of holes to ensure machining accuracy. Datum selection to the gearbox input shaft and the output shaft of the supporting hole as a rough benchmark, with top with two holes as a precision technology reference. Main processes arrangements to support holes for positioning and processing the top plane, and then the top plane and the supporting hole location hole processing technology. In addition to the follow-up processes individual processes are made of the top plane and technological hole location hole and plane processing. Supported hole processing using the method of coordinate boring. The whole process of processing machine combinations were selected. Selection of special fixture fixture, clamping means more choice of pneumatic clamping, clamping reliable, institutions can not be locked, so the production efficiency is high, suitable for large batch, line processing, can meet the design requirements. This article is on the 21 double rotor body parts processing application and processing technology and analysis, including the parts of the plan, the choice of blank, the clamping, the craft route making, tool selection, the determination of cutting conditions, processing documents. Choose the correct processing methods, design the reasonable process. In addition to the parts of the two process designing special fixture. Machine tool fixture of many kinds, among them, the most widely used common fixture, size specifications have been standardized, and a professional production plant. While widely used in batch production, specially for a workpiece processing services for the fixture, it needs each factory according to workpiece machining technology to design and manufacture. In this paper, the fixture design is the main content of the design truck center hole clamp. Key words: 21 double rotor body, processing technology, processing method, process documentation, fixture 5 目 录 摘 要 2 ABSTRACT 3 1 序言 6 2 零件的分析 8 2.1 零件的工艺分析 8 2.2 零件的工艺要求 8 3 工艺规程设计 9 3.1 加工工艺过程 9 3.2 确定各表面加工方案 9 3.2.1 影响加工方法的因素 9 3.3 加工方案的选择 10 3.3 确定定位基准 10 3.2.1 粗基准的选择 10 3.2.1 精基准选择的原则 11 3.4 工艺路线的拟订 11 3.4.1 工序的合理组合 12 3.4.2 工序的集中与分散 12 3.4.3 加工阶段的划分 13 3.4.4 加工工艺路线方案的比较 13 3.5 零件的偏差,加工余量,工序尺寸及毛坯尺寸的确定 15 3.5.1 毛坯的结构工艺要求 15 3.5.2 零件的偏差计算 16 3.6 确定切削用量及基本工时(机动时间) 17 3.7 时间定额计算及生产安排 20 4 车 中 心 孔m7端面夹具设计 22 4.1 车床夹具的主要类型 22 4.2 车床夹具的设计要点 23 6 4.3 定位机构 24 4.4 夹紧机构 25 4.5 零件的车床夹具的加工误差分析 25 4.6 零件的车床专用夹具简单使用说明 26 总结 28 参考文献 29 致 谢 30
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