随着机器制造工业的发展,零件表面光洁度的要求已经从过去的三级制演变成十四级制,必要时还可采用更细的级别;这是完全符合实际需要的。但是目前表面光洁度代号的标注方法,仍属整复;有必要加以适当的改进,以达到简便和清淅的目的。这里推荐一种新的标注方法(如下表),提供设计人 With the development of the machine-building industry, the requirements for the surface finish of parts have changed from the past three-stage performance to a fourteen-level system, with a finer level if necessary; this is entirely in line with actual needs. However, the current method of marking the surface finish code is still a reworking; it is necessary to make appropriate improvements so as to achieve the purpose of simplicity and cleanliness. Here a new method of labeling (as the following table) is recommended to provide designers