支架工艺及铣Φ14mm和Φ22mm孔端面夹具设计
一、选题简介、意义
. 随着社会发展的需要，机械加工作为一个传统而富有活力的行业，在现经济时代，其行业发生着结构性变化，工艺工装的设计与改良已成为企业生存和发展的必要条件，工艺工装的设计与改良直接影响加工产品的质量与性能。
本次设计是在学完了大学的全部基础课，专业课之后进行的；是我们在进行毕业实习之前对所学各课程的一次深入的综合性设计，要求我们运用先前所学的知识进行工艺与夹具的设计，通过这次毕业设计对自己未来将从事的工作进行了一次适应性训练，从中锻炼自己查阅相关资料、分析问题、解决问题的能力，能够更深入理解课本知识，对设计中涉及到的机械制造工艺规程，工艺方案论证，机械加工余量计算，工艺尺寸的确定，编写技术文件及专用夹具的设计与计算等各个方面有了更好的掌握，并能够更好的应用理论知识，为以后更好地胜任工作岗位打好基础，同时也是一次理论与实际相结合的训练。
二、研究的主要内容，拟解决的主要问题
根据毕业设计任务要求，主要研究了支架工艺及铣Φ14mm和Φ22mm孔夹具设计机械加工工艺过程的编制。首先介绍了支架工艺及铣Φ14mm和Φ22mm孔夹具设计作用和工艺分析，其次确定了毛坯尺寸，绘制了生产工件的毛坯图和零件图，然后进行了工艺规程设计，并附有生产工艺过程卡，机械加工工艺卡以及机械加工工艺卡，最后进行对铣下平面夹具设计，指出了工件的定位、夹紧、导向及其他元件或装置的结构形式，并对加工工序进行了精度校核。
通过这次设计，能够综合运用机械专业相关理论知识，分析和解决机械加工工艺问题，初步具备设计中等复杂程度零件的工艺规程的能力；能根据被加工零件的技术要求，运用夹具设计的基本原理和方法，学会拟定夹具设计方案，完善夹具结构设计，初步具备设计保证加工质量的高效、省力、经济合理的专用夹具的能力。
三、研究（工作）步骤、方法及措施（思路）
此次设计是对支架工艺及铣Φ14mm和Φ22mm孔夹具设计机械加工工艺过程的编制及铣下平面夹具设计，其零件为铸件，具有体积大，零件结构复杂的特点，由于面比孔易加工，在制定工艺规程时，就先加工面，再以面为基准来加工其它，其中各工序夹具都采用专用夹具，其机构设计简单，方便且能满足要求。其内容及具体要求如下：
（1）分析研究被加工零件，画出零件图。
（2）确定生产类型和工艺特征。
（3）选择毛坯种类及制造方法，确定毛坯尺寸，绘制毛坯图。
（4）选择加工方法，拟定工艺路线。
（5）进行工序设计和工艺计算。
（6）画出工序简图，填写工艺文件。
（7）设计专用夹具。
（8）编写毕业设计说明书。
目 录
第一章 绪论······································································································1
1.1 本课题的研究内容和意义选题的意义····························································1
1.2 国内外的发展概况···················································································1
1.3本课题应达到的要求················································································2
第二章 支架零件的三维造型······································································4
第三章 零件分析······························································································11
3.1 零件的作用·····························································································11
3.2 零件的工艺分析················································································11
第四章 工艺规程设计························································································13
4.1 确定毛坯的制造形成·················································································13
4.2 工艺过程设计所应采取的相应措施·····························································13
4.3 定位基准面的选择··················································································13
4.3.1 粗基准的选择························································································13
4.3.2 精基准的选择························································································14
4.4 制定工艺路线···························································································14
4.5 机械加工余量、工序尺寸及毛坯尺寸的确定···············································16
4.6 确定切削用量及基本工时··········································································16
第五章 专用普通夹具设计·················································································31
5.1设计主旨·································································································31
5.2夹具设计·································································································31
5.2.1定位基准的选择···················································································31
5.2.2切削力及夹紧力计算············································································31
5.2.3定位键、对刀块、塞尺的设计······························································33
5.2.4活动V形块的设计···············································································35
5.2.5夹具体的设计······················································································35
5.2.6夹具精度分析······················································································35
5.2.7夹具设计及操作的简要说明·································································37
毕业设计小结··································································································38
参考文献··························································································41
致谢···································································································42
附录·············································································································43
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附录
1.机械加工工艺过程卡1张
2.机械加工工艺卡1张
3.机械加工工艺工序卡2张
4.CAD图6张
