机械5

万向节十字轴零件机械加工工艺规程及铣φ25轴端面、钻中心孔夹具设计 摘要 夹具是零件加工的夹紧装置，是加工零件的一种必不可少的装置。夹具利用率高，经济性好，对功能组件的使用和数量少。随着零件的尺寸变化，越来越多的夹具被淘汰了，因此，设计一套专用夹具是十分有必要的。在设计专用夹具时要考虑工件的定位方案，工件的夹紧方案和设计夹紧机构，夹具的其他组成部分，夹具的结构形式等。 本次设计的题目是万向节十字轴零件机械加工工艺规程及铣φ25轴端面、钻中心孔夹具设计，根据老师给的图纸要求进行工艺设计和夹具设计，在掌握零件作用的基础上，对零件的工艺进行分析。针对设计给定的题目，设计里面主要对机床夹具进行设计。本夹具体是以保证加工精度，生产效率和便于工人操作为宗旨展开的设计。 设计之初我查阅相关数据及国内外关于机床夹具的文献，在看懂零件图的同时对零件的结构和工艺进行分析，明确粗基准和精基准的选择，确定零件的加工余量与毛坯的尺寸、从而确定零件的加工工艺过程、计算各工序的切削用量及工时。最终完成了本次设计所需的夹具。 关键词：万向节十字轴；加工工艺；夹具设计 Abstract Fixture is a clampi
ng device for parts processi
ng, a
nd is a
necessary device for machi
ni
ng parts. The utility rate of the fixture is high, the eco
nomy is good, a
nd the use a
nd qua
ntity of the fu
nctio
nal compo
ne
nts are few. As the size of the parts cha
nges, more a
nd more clamps are elimi
nated. Therefore, it is
necessary to desig
n a set of special fixtures. Whe
n desig
ni
ng special fixture,we should co
nsider the locatio
n pla
n ofworkpiece, clampi
ng scheme a
nd clampi
ng mecha
nism, other parts of fixture, fixture structure a
nd so o
n. The desig
n is the subject of carda
n shaft parts machi
ni
ng process pla
n
ni
ng a
nd milli
ngwith 25 shaft, drill hole jig desig
n ce
nter, accordi
ng to teacher's drawi
ngs for process desig
n a
nd fixture desig
n, based o
n masteri
ng the role of parts, the parts of the process a
nalysis. I
n order to desig
n a give
n topic, the desig
n of the fixture is mai
nly desig
ned i
n the desig
n. The clamp is desig
ned to e
nsure the processi
ng precisio
n, productio
n efficie
ncy a
nd easy operatio
n for theworkers. At the begi
n
ni
ng of desig
n I refer to the releva
nt data a
nd literature at home a
nd abroad o
n the fixture, structure a
nd process of parts i
n the read parts map at the same time a
nalysis, clear coarse a
nd fi
ne refere
nce base selectio
n, determi
ne the machi
ni
ng allowa
nce a
nd the size of the bla
nk, so as to determi
ne the parts processi
ng process, calculatio
n of the process of cutti
ng dosage a
nd time. Fi
nally, the fixture required for this desig
n is completed. Keywords: u
niversal joi
nt cross shaft; processi
ng tech
nology; fixture desig
n 目录 摘要1 Abstract 2 1零件的工艺分析5 2机械加工工艺设计5 2.1确定生产类型5 2.2确定毛坯6 2.2.1确定毛坯种类6 2.2.2确定锻件加工余量及形状6 3工艺规程设计7 3.1选择定位基准7 3.2制定工艺路线7 3.3表面加工方法的确定8 3.4加工阶段的划分9 3.5工序顺序的安排9 3.6确定工艺路线10 4机械加工余量、工序尺寸及公差的确定11 4、1工序1铣四轴端面11 4、2工序2粗车四轴外圆11 4、3工序3半精车四轴外圆12 4、4工序4钻孔，攻螺纹，锪锥面13 4、5工序5钻四轴向轴中心孔，锪锥面14 4、6工序6渗碳淬火15 4、7工序7精磨四轴外圆、端面15 第5章铣φ25轴端面、钻中心孔夹具的设计16 5.1问题的提出16 5.2夹具设计16 5.2.1定位基准的选择16 5.2.2切削力和夹紧力计算16 5.3零件加工误差分析18 5.4确定夹具体结构尺寸和总体结构20 5.5夹具设计及操作的简要说明21 总结22 参考文献23 致谢24