常熟市华菱砂轮有限公司

磨具粒度是指磨料颗粒几何尺寸的大小，国家标准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，用粗粒度砂轮磨削是磨削效率高，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 NO.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 Usage
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-precesion grinding
60、70、80、90、100	用于一般要求的精磨 For common fine grinding
120、150、180、220、W63、W50、W40、W28、W20	用于研磨、螺纹磨等 For polishing and threading
W14、W10、W7、W5、W3.5、W1.5、W1.0、W0.5	用于镜面磨、精细抛光等 For mirror-surface grinding and finer polishing

磨料是制造磨具的主要原料，对工件起磨削作用，普通磨具使用的磨料主要有刚玉和碳化硅两大类。

Abrasives are the main materials for making abrasive tools and play a grinding part in use. The abrasives for common abrasive tools usually fall into two categories.

代号Code

种类
Type

特点
Feature

用途
Usage

棕刚玉

Brown fused alumina

硬度高，韧性大

High hardness and toughness

适用于中高抗张强度金属材料的磨削，如一般碳素钢、合金钢、合金钢、可锻铸铁、硬青铜等。

It is suitable for grinding medium and high tensile strength metal such as ordinary carbon Steel, alloy steels, malleable cast iron, hard bronae, etc.

白刚玉

While fused alumina

硬度高于棕刚玉，磨粒易碎裂，棱角锋利，切削性能好，磨削热量小等。

Ｉts hardnes is higher than that of A. Its grains are easily broken. The edges of the grains are sharp and of excellent cutting performance. Only small quantity of heat is created in use.

适用于材料较硬、热敏感性较强钢材的磨削。如淬火钢、高碳钢、一般高速钢、合金钢等的磨削。主要用于工具、刃具、模具、齿轮、螺纹、薄壁零件等的磨削及成型磨削。

It is used for grinding harder material and metals sensitive to heat such as chilled steel, high speed steel, alloy steel. It is mainly suitable for the grinding and forming grinding of instruments, cutting tools mouldings, gears, threads, thin-wall parts,etc.

棕白混合磨料

Mixture of A and WA

具有棕、白刚玉两者的优点

It posseses the advantages of both A and WA

适用于球墨铸铁曲轴、凸轮轴等工件的磨削及其他磨削。

It is suitable for the grinding of nodular east iron crankshaft, cam shafts and other workpieces.