机械5

摘要 本次毕设的内容是扇形块加工工艺设计，夹具设计及三维建模。其设计涉及到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。该零件是机构上面一个重要的附件，因为其外形类似扇面，故取名扇形块。其作用是为机器的正常运转提供保障，实现相应的运动。该零件的材料是45钢，该材料综合性能比较好。设计内容含零件加工的工艺设计以及专用夹具的设计。 工艺设计的内容有完成零件结构的分析，设计了2种加工零件的方法，选择了比较合适的一条，填写工艺卡。选择了零件的加工基准，选取了加工余量，计算出了相应的切削数据，填写了工序卡，完成了零件图还有毛坯图。 专用夹具的主要内容有：根据工序图上面的定位和夹紧简图，设计钻3-Ф8孔钻床专用夹具，采用的机床是Z4006A台式钻床。设计了定位和夹紧方案，选择了定位和夹紧元件。选择标准件钻套等等。最后，完成三维实体建模，夹具装配图还有所有非标零件图的绘制，编写了设计说明书等。 关键词：扇形块；加工工艺；夹具设计；三维建模；钻3-Ф8孔 Abstract The co
nte
nt of this desig
n is the machi
ni
ng process desig
n of the segme
nt, fixture desig
n a
nd 3D modeli
ng. Its desig
n i
nvolves awide ra
nge of k
nowledge i
n mecha
nical ma
nufacturi
ng processes a
nd machi
ne tool fixture desig
n, metal cutti
ng machi
ne tools, tolera
nces a
nd measureme
nts. This part is a
n importa
nt accessory o
n the mecha
nism. Because it has a shape similar to a fa
n, it is
named a fa
n. Its role is to provide guara
ntee for the
normal operatio
n of the machi
ne a
nd achieve the correspo
ndi
ng moveme
nt. The material of the part is 45 steel, a
nd the material has better comprehe
nsive performa
nce. The desig
n co
nte
nt i
ncludes the process desig
n of the part processi
ng a
nd the desig
n of the special fixture. The co
nte
nt of the process desig
n has the a
nalysis of the completed part structure, a
nd the two methods of processi
ng the parts are desig
ned. A more suitable o
ne is selected a
nd the process card is filled out. The machi
ni
ng refere
nce of the partwas selected, the machi
ni
ng allowa
ncewas selected, the correspo
ndi
ng cutti
ng datawas calculated, the operatio
n cardwas filled out, a
nd the part drawi
ng a
nd the bla
nk drawi
ngwere completed. The mai
n co
nte
nts of the special fixture are: accordi
ng to the positio
ni
ng a
nd clampi
ng diagram above the process diagram, the special fixture for drilli
ng 3-Ф8 hole drilli
ng machi
ne is desig
ned. The machi
ne tool used is Z4006A be
nch drilli
ng machi
ne. The positio
ni
ng a
nd clampi
ng schemewas desig
ned a
nd the positio
ni
ng a
nd clampi
ng eleme
ntswere selected. Choose sta
ndard drill sleeves a
nd more. Fi
nally, complete 3D solid modeli
ng, fixture assembly drawi
ngs a
nd drawi
ng of all
no
n-sta
ndard parts drawi
ngs, a
nd desig
n specificatio
ns. Keywords: sector block; machi
ni
ng process; fixture desig
n; three-dime
nsio
nal modeli
ng; drilli
ng 3-Ф8 hole 目录 摘要I Abstract II 一、绪论1 （一）机床夹具的组成1 （二）机床夹具的研究现状1 （三）现代机床夹具的发展方向2 二、零件的分析4 （一）分析零件的作用4 （二）分析零件的材料5 （三）分析零件的组成表面5 （四）分析零件加工面的加工要求5 （五）分析零件的形位公差5 三、设计零件加工工艺规程6 （一）确定零件制造形式6 （二）确定零件生产类型6 （三）零件加工基准的选择7 （四）设计、分析以及确定加工工艺路线8 （五）确定机床、夹具、刀具及量具9 （六）确定机加工余量9 （七）确定切削用量及工时11 四、钻3-Ф8孔专用夹具的设计20 （一）专用夹具设计前的分析20 （二）设计定位方案及确定定位元件20 （三）设计夹紧方案及确定夹紧元件21 （四）设计夹具体22 （五）选择对刀装置—钻套23 （六）钻削力和夹紧力的计算23 （七）分析夹具定位精度24 五、结论25 致谢辞26 参考文献27