机械5

CAD与CAM技术在数控加工中的应用 --典型汽车零部件的CAM编程（汽车变速器下箱体） 摘要 CAD/CAM技术作为提高企业设计效率、减轻技术人员的劳动强度，优化设计方案的强有力手段，已经成为现代制造系统中的关键技术，它的应用和发展直接影响着现代制造系统的最终功能及实现。对于典型汽车零部件这样的复杂机械零件的加工来说，传统的手工编制程序的方法已不能满足企业生产的要求。CAD/CAM技术的实现将加快企业生成产自动化的步伐，提高企业的经济效益和社会效益。 本文研究汽车手动变速器下箱体的数控加工。实现汽车手动变速器下箱体的数控加工，关键是进行数控编程，而数控编程的关键是对箱体进行数控加工工艺分析。因此，本文在创建CAM加工操作之前，对箱体的数控加工工艺性进行了全面分析。在对箱体进行数控加工工艺分析之前，有必要先对其工作环境和工作原理进行了解，以便弄清楚箱体中哪些是重要表面，哪些是重要尺寸，哪些是主要基准等主要内容。 关键词:计算机辅助制造；数控加工；自动编程 The Applicatio
n of CAD／CAM i
n NC Machi
ni
ng --Typical Automobile Parts CAM Programmi
ng(box) ABSTRACT CAD/CAM tech
nology is stro
ng mea
ns i
n improve the desig
n efficie
ncy, reduce the labor i
nte
nsity of tech
nical perso
n
nel, a
nd optimize the desig
n scheme, it has become a key tech
nology i
n the moder
n ma
nufacturi
ng system, the applicatio
n a
nd developme
nt of it directly affects the fi
nal fu
nctio
n a
nd realizatio
n of the moder
n ma
nufacturi
ng system. For automobile parts such typical complex mecha
nical parts processi
ng, the traditio
nal ma
nual programmi
ng method ca
n
not meet the requireme
nts of e
nterprise productio
n. The realizatio
n of the CAD/CAM tech
nology to accelerate the pace of e
nterprises produce productio
n automatio
n, improve e
nterprise eco
nomic be
nefit a
nd social be
nefit. I
n this paper,we study the car frame of
nc machi
ni
ng u
nder ma
nual tra
nsmissio
n. Impleme
ntatio
n u
nder the car ma
nual tra
nsmissio
n box of
nc machi
ni
ng, the key is to
nc programmi
ng, the
nc programmi
ng is the key to
nc machi
ni
ng process a
nalysiswas carried out o
n the box body. Therefore, this article before create a CAM machi
ni
ng operatio
ns,
nc machi
ni
ng tech
nology has carried o
n the comprehe
nsive a
nalysis of the box body. Before the
nc machi
ni
ng process a
nalysiswas carried out o
n the box body, it is
necessary first to u
ndersta
nd theworki
ng e
nviro
nme
nt a
ndworki
ng pri
nciple, i
n order to figure outwhat is importa
nt i
n body surface,which is a
n importa
nt dime
nsio
n,which is a key such as the mai
n co
nte
nt. Keywords: Computer aided ma
nufacturi
ng; The
nc machi
ni
ng; Automatic programmi
ng 目录 1绪论1 1.1课题来源及研究的目的和意义1 1.2相关的技术背景2 1.3国内外在该方向的研究现状及分析4 1.4主要研究内容6 2箱体加工工艺规程制定8 2.1零件的分析8 2.1.1零件的作用8 2.1.2零件的工艺分析8 2.2变速箱箱体加工的主要问题和工艺过程设计所应采取的相应措施9 2.2.1孔和平面的加工顺序9 2.2.2孔系加工方案选择10 2.3变速箱箱体加工定位基准的选择10 2.3.1粗基准的选择10 2.3.2精基准的选择10 2.4变速箱箱体加工主要工序安排11 2.5机械加工余量、工序尺寸及毛坯尺寸的确定13 3 UG环境下的箱体CAM编程19 3.1 UG CAM数控编程方法19 3.2利用UG进行箱体CAM编程22 4箱体加工工艺参数的分析及选择确定28 4.1工艺参数分析28 4.2箱体平面加工参数33 4.2.1平面铣子类型的分析33 4.2.2平面铣加工参数的分析36 4.2.3箱体平面加工参数的确定38 4.3箱体孔系加工参数39 4.3.1钻孔加工子类型的分析39 4.3.2孔系加工参数的分析40 4.3.3箱体孔系加工参数的确定42 5结论43 致谢45 参考文献46