C620-1B型车床顶尖套的机械加工 工艺及加工左端5个孔的夹具设计 摘要：C620-1B型车床顶尖套及其加工左端5个孔的夹具设计是对顶尖套的零件分析、工艺规程设计、夹具设计和误差分析等部分。 首先是对零件的分析，从功用、结构、工艺进行分析，对顶尖套进行一定的了解，然后选择出合适的毛坯材料，计算出毛坯量及公差。根据实际生产中顶尖套的机械加工过程，选择定位基准包括粗基准和精基准的选择，初步确定加工路线，完成对每一步加工后的余量及切削用量与时间定额的计算，选择合适的加工工艺装备，确定加工工艺。 最后完成对加工左端5个孔的专业夹具的设计，包括夹具结构的设计、夹紧装置的设计等，明确夹具的装配要求。因为在定位误差、夹紧误差和加工过程中力的存在对零件加工的影响，需要对误差进行计算分析，确定夹具的合理。 关键词：夹具；加工工艺；基准；误差 Machi
ni
ng tech
nology of lathe top cover a
nd fixture desig
n of machi
ni
ng hole ABSTRACT：The ce
nter sleeve of c620-1b lathe a
nd the fixture desig
n for machi
ni
ng 5 holes o
n the left e
nd are the parts a
nalysis, process specificatio
n desig
n, fixture desig
n a
nd error a
nalysis of the ce
nter sleeve. The first is the a
nalysis of parts, from the fu
nctio
n, structure, process a
nalysis, the top cover for a certai
n u
ndersta
ndi
ng, a
nd the
n choose the appropriate bla
nk material, calculate the bla
nk amou
nt a
nd tolera
nce.Accordi
ng to the actual productio
n of the top set of mecha
nical processi
ng process, the selectio
n of positio
ni
ng datum i
ncludi
ng coarse datum a
nd fi
ne datum selectio
n, the prelimi
nary determi
natio
n of the processi
ng route, the completio
n of each step after the processi
ng of the allowa
nce a
nd cutti
ng amou
nt a
nd time quota calculatio
n, the selectio
n of appropriate processi
ng equipme
nt, determi
ne the processi
ng process. Fi
nally, complete the desig
n of professio
nal fixture for machi
ni
ng 5 holes o
n the left e
nd, i
ncludi
ng the desig
n of fixture structure a
nd the desig
n of clampi
ng device, etc., a
nd make clear the assembly requireme
nts of fixture.Because the positio
ni
ng error, clampi
ng error a
nd the prese
nce of force i
n the processi
ng process have a
n impact o
n the processi
ng of parts, the error
needs to be calculated a
nd a
nalyzed to determi
ne the reaso
nability of the fixture. KEYWORDS:Fixture; Processi
ng Tech
nology; Be
nchmark; Error 目录 1引言…………………………………………………………………1 1.1研究背景及意义……………………………………………………1 1.2研究内容……………………………………………………………2 2零件分析……………………………………………………………3 2.1功用分析……………………………………………………………3 2.2结构分析……………………………………………………………3 2.3工艺分析……………………………………………………………3 3零件毛坯的选择……………………………………………………3 3.1毛坯材料的选择……………………………………………………3 3.2计算毛坯余量及公差………………………………………………3 3.3绘制毛坯图…………………………………………………………4 4工艺规程设计………………………………………………………4 4.1选择定位基准………………………………………………………4 4.2确定工艺路线………………………………………………………5 4.3确定加工设备及工艺装备…………………………………………6 4.4加工余量、工序尺寸及公差的计算………………………………7 4.5切削用量的计算……………………………………………………8 4.6时间定额的计算……………………………………………………8 4.7确定工序及工艺……………………………………………………16 5夹具设计……………………………………………………………17 5.1夹具设计概述………………………………………………………17 5.2夹具结构设计………………………………………………………18 5.3夹紧装置的设计……………………………………………………19 5.4夹具的装配要求及使用注意事项…………………………………21 注释……………………………………………………………………22 参考文献………………………………………………………………24 附录……………………………………………………………………25