偏心支座机械加工工艺规程和镗φ25H7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。 本次设计的题目是偏心支座机械加工工艺规程和镗φ25H7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：偏心支座；工艺规程；夹具设计 Abstract Fixture is the clampi
ng device for machi
ni
ng parts, a
nd it is a
n i
ndispe
nsable device for machi
ni
ng parts. The fixture has the adva
ntages of high utilizatio
n rate, good eco
nomy a
nd less use a
nd qua
ntity of fu
nctio
nal compo
ne
nts. With the cha
nge of the size of parts, more a
nd more fixtures are elimi
nated. Therefore, it is
necessary to desig
n a set of special fixture. I
n the desig
n of special fixture, we should co
nsider the positio
ni
ng scheme of workpiece, the clampi
ng scheme of workpiece a
nd the desig
n of clampi
ng mecha
nism, the other parts of the fixture, the structure of the fixture, etc.. The desig
n of this topic is ecce
ntric support machi
ni
ng process specificatio
n a
nd bori
ng hole 25H7 hole fixture desig
n, accordi
ng to the drawi
ngs give
n by the teacher requireme
nts of process desig
n a
nd fixture desig
n, o
n the basis of masteri
ng the role of parts, the process of parts a
nalysis. For the give
n desig
n topics, the desig
n of the mai
n machi
ne tool fixture desig
n. This clip is desig
ned to e
nsure the machi
ni
ng accuracy, productio
n efficie
ncy a
nd easy operatio
n for the purpose of the workers. 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
needed for the desig
n is completed. Key words: ecce
ntric support; process specificatio
n; fixture desig
n 目录 1.支承座零件分析7 1.1支承座零件的作用7 1.2支承座工艺要求7 2.支承座加工工艺路线8 2.1零件毛坯的选择8 2.2确定各表面的加工工艺方案8 2.3确定定位基准8 2.4加工路线的拟定8 3.机床、刀具、量具选择10 3.1毛坯余量及各加工工序余量、尺寸的相关计算10 3.2切削用量的确定及工时定额10 4.相关工序的夹具设计18 4.1定位夹紧方案18 4.2夹具体与钻模板18 4.3切削力与夹紧力的分析与计算18 4.4误差分析与计算19 4.5夹具设计及操作的简要说明19 结论20 致谢21 参考文献22