机械5

支座零件机械加工工艺规程及其钻支座底部2-φ20孔夹具设计 摘要 本次设计内容涉及了机械制造工艺及机床夹具设计、金属切削机床、公差配合与测量等多方面的知识。 支座的加工工艺规程和钻支座2×Φ20孔的工艺设计、工序设计以及专用夹具的设计三部分。在工艺设计中要首先对零件进行分析，了解零件的工艺再设计出毛坯的结构，并选择好零件的加工基准，设计出零件的工艺路线；接着对零件各个工步的工序进行尺寸计算，关键是决定出各个工序的工艺装备及切削用量；然后进行专用夹具的设计，选择设计出夹具的各个组成部件，如定位元件、夹紧元件、引导元件、夹具体与机床的连接部件以及其它部件；计算出夹具定位时产生的定位误差，分析夹具结构的合理性与不足之处，并在以后设计中注意改进。 关键词：切削用量；夹紧；定位；误差 Abstract The desig
n i
nvolves the mecha
nical ma
nufacturi
ng process a
nd machi
ne tool fixture desig
n, metal cutti
ng machi
ne tools, tolera
nce a
nd measureme
nt, a
nd other aspects of k
nowledge. The processi
ng tech
nical regulatio
ns of the support a
nd the desig
n of the 2x- 20 hole of the drill support, the desig
n of the process a
nd the desig
n of the special fixture are the three parts. I
n the process of desig
n should first u
ndersta
nd the a
nalysis of parts, parts of the process to desig
n a bla
nk structure, a
nd choose the good compo
ne
nts the processi
ng datum, desig
ns the process routes of the parts; the
n the parts of each labor step process size calculatio
n, is the key to decide the craft equipme
nt a
nd the cutti
ng process of thevarious desig
n parameters; the
n a special fixture, the fixture selectio
n for thevarious compo
ne
nts of the desig
n, such as co
n
necti
ng parts positio
ni
ng eleme
nts a
nd clampi
ng eleme
nts, guide eleme
nt, fixture a
nd machi
ne tool a
nd other compo
ne
nts; positio
ni
ng error is calculatedwhe
n the fixture, a
nalysis the ratio
nality a
nd shortcomi
ng of fixture structure, improve a
nd desig
n i
n later. Keywords: Cutti
ng amou
nt; clampi
ng; positio
ni
ng; error 目录 摘要II 第一章序言1 第二章计算生产纲领、生产效率分析2 2.1生产纲领2 2.2生产效率分析2 第三章毛坯的制造方法3 3.1确定毛坯的制造形式3 3.2毛坯尺寸公差3 第四章零件的工艺设计4 4.1零件的工艺设计4 4.2工艺规程的设计4 4.2.1基准的选择4 4.2.2制定工艺路线5 4.2.3机械加工余量、工序尺寸及毛坯尺寸的确定5 4.2.4确定切削用量及基准工时6 第五章钻床夹具设计14 5.1专用夹具的提出14 5.2定位元件及夹紧元件的选择14 5.3切削力和夹紧力的计算14 5.4定位误差分析15 5.5钻套的设计16 5.6夹具设计及操作简要说明18 致谢19 参考文献20