在零件图中,用图形表达了零件的形状,标注尺寸确定了零件的大小,除此以外,还应标明设计中对零件提出的各项要求。这些内容有的用文字说明,但为了简便,多数以符号代表。因此,要看懂零件图,必须明白图上的各种符号代表什么意义。下面以图1、图2为例,分别介绍一下各种符号的意义。一、尺寸中的符号 In the part drawing, the shape of the part is expressed graphically, the size of the part is determined by the dimensioning of the part, and in addition, the requirements for the part proposed in the design shall also be indicated. Some of these contents are illustrated in text, but for simplicity, most are symbolized. Therefore, to understand the parts map, you must understand what the symbols on the map represent. Below to Figure 1, Figure 2, for example, introduced the meaning of various symbols. First, the size of the symbol