Grinding disc, which includes a top disc, a buffer plate and a grinding sheet; wherein the top disc includes several riveting elements, an upper positioning plate, a top plate, a bolt, a lower positioning plate and a nut; the utility model By improving the bolt structure, firstly, the locking part of the bolt itself is engaged with the central hole of the top plate to provide horizontal accuracy, and then a polygonal fixing part under the bolt is opposite to the polygonal fixing hole of the lower positioning plate. It can be locked for vertical accuracy, thereby providing a grinding disc with good fixation and rotation stability; in addition, the design of the upper thread section, the engagement part and the fixing part of the bolt with different outer diameters makes the bolt difficult Loose, it has the advantages that the internal components are not easy to wear and the user does not cause soreness in the hands due to the unstable rotation of the grinding disc.
Polishing is based on a more refined process after grinding, so the choice of polishing materials is also more refined. The flat surface polishing machine is a kind of equipment that specializes in processing the surface brightness of the workpiece. There is an important configuration on it-the polishing disk. The choice of the polishing disc is very important, it affects the specific effect of the surface polishing of the workpiece to a certain extent, and is an indispensable part of the polishing process.