Grinding is a kind of surface modification technology. It generally refers to a processing method that changes the physical properties of the material surface by friction with the help of rough objects (sandpaper containing high hardness particles, etc.). The main purpose is to obtain specific surface roughness 打磨 打磨，是表面改性技术的一种，一般指借助粗糙物体（含有较高硬度颗粒的砂纸等）来通过摩擦改变材料表面物理性能的一种加工方法，主要目的是为了获取特定表面粗糙度
