Drawing of Partial Enlargement(局部放大图)

The drawing of a partial enlargement is a drawing that draws a partial local structure of an object with a scale-up local view. The drawing of a partial enlargement can be represented by regular views,sections, or cuts, hence it is not confined by any particular drawing methods,as shown in Fig.6-56. The drawing of a partial enlargement should be positioned nearby the original part, The scale-up portion should be circled out with continuous thin line,and then the scale should be written above the view.As when necessary, an identical part can be represented with multiple drawings of partial scale-up, as shown in Fig. 6-57.


When there are several scale-up parts on the same object, they must be labeled with Roman numerals in turn. The concrete drawing method is shown in Fig.6-58.