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.

将机件的部分结构,用大于原图形所采用的比例画出的图形,称为局部放大图。局部放大图可画成视图,也可画成剖视图、断面图,它与被放大部分的表达方式无关,如图6-56所示。局部放大图应尽量配置在被放大部位附近。绘制局部放大图时,用细实线圈出被放大部位,并在图形上方注明比例大小。必要时可用几个图形来表示同一个被放大部分的结构,如图6-57所示。

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.

当同一机件上有几个被放大的部分时,应用罗马数字依次标明被放大部位,并在局部放大图的上方标注出相应的罗马数字和所采用的比例,如图6-58所示。