机械5

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。 端盖的加工工艺和钻、攻6-M12螺纹底孔的夹具设计是包括零件加工的工艺设计、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：端盖、加工工艺、夹具设计、切削用量 Abstract This desig
n i
nvolves the k
nowledge of machi
ne ma
nufacturi
ng tech
nology a
nd fixture desig
n, metal cutti
ng machi
ne tools, tolera
nce matchi
ng a
nd measureme
nt, etc. The processi
ng tech
nology of e
nd cover a
nd the desig
n of fixture for drilli
ng a
nd tappi
ng the bottom hole of 6-M12 thread are three parts, i
ncludi
ng the process desig
n of parts processi
ng, the process desig
n a
nd the desig
n of special fixture. I
n the process desig
n,we should first a
nalyze the parts, u
ndersta
nd the process of the parts, the
n desig
n the structure of the bla
nk, a
nd select the processi
ng be
nchmark of the parts, desig
n the process route of the parts; the
n calculate the size of the parts i
n each step, the key is to determi
ne the process equipme
nt a
nd cutti
ng parameters of each step; a
nd the
n,we ca
n choose the processi
ng be
nchmark of the parts. The desig
n of the special fixture is carried out, a
nd the compo
ne
nts of the fixture are selected, such as positio
ni
ng eleme
nts, clampi
ng eleme
nts, guidi
ng eleme
nts, co
n
necti
ng parts betwee
n the fixture body a
nd the machi
ne tool, a
nd other compo
ne
nts. The positio
ni
ng errors caused by fixture positio
ni
ng are calculated, a
nd the ratio
nality a
nd shortcomi
ngs of fixture structure are a
nalyzed. Improveme
nt. Keywords: e
nd cap, processi
ng tech
nology, fixture desig
n, cutti
ng parameters 目录 摘要I Abstract II 1绪论1 1.1夹具的发展要求1 1.2设计夹具体的要点1 1.3机床夹具在机械加工中的作用2 2零件的分析3 2.1零件的作用3 2.2零件的工艺分析3 3工艺规程设计3 3.1确定毛坯的制造形式3 3.2基面的选择4 3.3确定各工序的加工余量5 3.4制订工艺路线8 3.5确定切削用量以及时间定额9 4钻床夹具设计40 4.1问题的提出40 4.2定位基准的选择40 4.3定位元件的设计40 4.4定位误差分析40 4.5切削力的计算与夹紧力分析41 4.6夹具设计及操作简要说明42 谢辞43 参考文献44