粗镗汽车变速箱体轴承孔组合机床设计【镗前后轴承孔+扩倒档孔】（有CAD图纸）.pdf

XX () + () 2015 1 2 3 II ABSTRACT This thesis mainly elucidates the basic process and requirements that design of the combination machine. Combination machine is designed according the fundamental , which highly centralized ,or , more correctly it can process one working procedure or more different working procedures at one time . Combination machine was developed in the end of industrial production compared with traditional machine; combination machine has many advantages , such as high efficiency , high accuracy and low cost . It is composed of some general parts , such as bed ,column ,work able ,power unit ,and some special parts designed according to different work piece machining need. The preface of a lot of works can be completed on the combination machine, but in regard to the majority current usage of combination machine, then and primarily used for the flat surface to process and the bore to process two big