粒度
Grit sizes
磨具粒度是指磨料颗粒几何尺寸的大小，国家标准按磨粒尺寸的大小将磨料分为41个粒度号。
磨具粒度的选择直接影响到工件加工的表面粗糙度及磨削效率。一般来说，用粗粒度砂轮磨削时磨削效率高，但工件表面粗糙度差；用细粒度砂轮磨削时，工件表面粗糙度较好，但磨削效率低。总之，在满足工件表面粗糙度要求的前提下，应尽量选用粒度较粗的磨具，以保证较高的磨削效率。
Grit size of abrasive tools indicates the geometric dimensions of abrasive grains .Abrasive grains can be divided into 41 grit sizes, in accordance with the dimensions of abrasive grains stipulated in china national standard .
The selection of grit sizes has direct influences on the surface roughness and cutting efficiency of workpieces. Generally, the wheels in big sizes possesses high cutting efficiency, but the surface roughness of the workpiece is worse. Whereas the wheels in finer sizes possesses low cutting efficiency, but the surface roughness is better. In short, with the prerequisite of meeting requirements on the roughness, it is better to select the abrasive tools of coarse grains to guarantee high cutting efficiency.
| 粒度号Grit sizes |
使用范围Range of use |
| 4,5,6,8,10,12,14,16,20,22,24,30 |
用于粗磨及切割等
For rough grinding and cutting
|
| 36,40,46,54 |
用于一般要求的半精磨
For common semi-precision grinding
|
| 60,70,80,90,100 |
用于一般要求的精磨
For common fine grinding
|
| 120,150,180,220,240，w63,w50,w40,w28,w20 |
用于研磨、螺纹磨等
For polishing and threading
|
| w14,w10,w7,w5,w3.5,w2.5,w1.5,w1.0,w0.5 |
用于镜面磨、精细抛光等
For micor-surface grinding and finer polishing
|