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。 支架加工工艺规程及其镗3Φ30H8孔的夹具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：支架；夹具设计、工艺路线 Abstract The co
nte
nt of this 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 process specificatio
n of bracket a
nd the fixture for bori
ng 3Φ30h8 hole are three parts i
ncludi
ng the process desig
n, process desig
n a
nd the desig
n of special fixture. I
n the process desig
n, we should first a
nalyze the part, u
ndersta
nd the process of the part a
nd the
n desig
n the structure of the bla
nk, a
nd select the machi
ni
ng datum of the part, desig
n the process route of the part; The
n the size of each step of the part is calculated, the key is to determi
ne each step of the process equipme
nt a
nd cutti
ng qua
ntities, a
nd the
n carry out the desig
n of special fixture, select the desig
n of the fixture compo
ne
nts, for example, the positio
ni
ng eleme
nts, clampi
ng eleme
nts, guidi
ng eleme
nts, the co
n
necti
ng parts betwee
n the fixture a
nd the machi
ne tool, as well as other parts, the positio
ni
ng errors caused by the positio
ni
ng of the fixture are calculated, a
nd the ratio
nality a
nd shortcomi
ngs of the fixture structure are a
nalyzed, a
nd pay atte
ntio
n to the improveme
nt i
n the future desig
n. Keywords: Support; fixture desig
n, process li
ne. 目录 摘要I Abstract II 绪论1 1计算生产纲领、确定生产类型2 1.1生产纲领2 1.2生产类型2 2零件分析4 2.1零件的结构分析4 2.1.1零件图分析4 2.1.2结构工艺性分析4 2.2零件的技术要求分析5 2.2.1加工表面的尺寸精度和形状精度5 2.2.2主要加工表面之间的相互位置精度5 2.2.3加工表面的粗糙度5 3工艺规程设计7 3.1定位基准的选择7 3.1.1粗基准的选择7 3.1.2精基准的选择7 3.2制定加工工艺路线8 3.3选择加工设备及工艺装备9 3.4加工工序设计、工序尺寸计算10 3.5选择切削用量、确定时间定额12 4机床专用夹具设计25 4.1专用夹具的提出25 4.2夹具总体方案设计25 4.3夹具设计25 4.3.1定位元件设计25 4.3.2夹紧元件设计25 4.3.3夹具体设计25 4.4定位元件定位误差分析和计算25 4.5夹紧机构设计和夹紧力计算26 4.5.1确定驱动机构26 4.5.2夹紧力计算26 4.5镗套的设计27 总结29 致谢30 参考文献31