With the rapid development and structural adjustment of China's machinery manufacturing industry, the quality of abrasive products in the China cutting disc for metal industry is getting higher and higher. The calcination of polished sand can greatly improve the quality of the products. Let us look at it together. The effect of calcination on the polishing sand. 1. Hydrophilic. After the abrasive is fired at 800 ° C - 1350 ° C for 2 - 4 hours, the hydrophilic properties of the abrasive are increased by 3.5 times. This is mainly due to the removal of impurities such as volatiles on the surface of the abrasive, the burning of the low melting point material, and the increase in the capillary phenomenon on the surface of the abrasive. The abrasive bulk density is correspondingly reduced, the hydrophilicity is improved, and the abrasive is used for coating the cutting disc, and the durability can be improved by about 30%. 2. Cutting disc strength. After the calcination treatment, the abrasive removes impurities such as surface volatiles, thereby improving the purity and cleanliness of the abrasive, thereby improving the bonding force of the abrasive particles and the binder during the manufacture of the cutting disc, reducing the amount of the bonding agent, and improving the strength of the cutting disc. 3. Improved appearance and cutting ability of the cutting disc. After the calcination treatment, the abrasive material is easily detached due to the expansion and rupture of the wrapped iron corundum abrasive grains, which reduces the magnetic content of the abrasive, does not cause rust spots when firing the cutting disc, and improves the appearance and cutting of the cutting disc. ability. In fact, in addition to the calcination can improve the quality of the polishing sand to a certain extent, chemical treatment can also improve the quality of the product, but the chemical treatment is relatively high in cost compared to calcination, and it also brings environmental pollution, so calcination This treatment is still relatively good. Since the application technology of the polishing and has not yet reached a high level, the workpiece to be polished and the polishing material itself are the main factors affecting the polishing quality. High-quality workpieces to be polished are prerequisites for good polishing results. If the workpiece to be polished is trapped in the workpiece, then the best polishing material is unlikely to achieve the desired polishing effect. The effect of polishing sand on the process: Since the polishing sand is mainly done manually, the polishing material technology is still the main reason that affects the quality of the polishing material. In addition, it is related to the mold material, the surface condition before polishing the material, the heat treatment process, and the like. Good steel is a prerequisite for obtaining a good quality of polished materials. If the surface hardness of steel is not uniform or the characteristics are different, it will often cause difficulty in polishing materials. Various inclusions and pores in the steel are not conducive to the polishing material. In the process of mechanical crushing, the surface layer may be damaged by heat, internal stress or other factors, and improper cutting parameters may affect the efficiency of the polishing material. The surface after EDM is more difficult to grind than the surface after ordinary machining or heat treatment. Therefore, the fine gauge quasi-electric spark should be used before the end of EDM, otherwise, the surface will form a hardened thin layer. If the EDM is not properly selected, the depth of the heat affected layer can reach 0.4mm. The hardness of the hardened layer is higher than the hardness of the substrate and should be removed in time. Therefore, it is possible to add a rough grinding process to completely remove the damaged surface layer and form an average rough metal surface, which provides a good basis for the processing of the polishing material. Polished sand will also be affected by the hardness of the polished workpiece. The hardness will be different, which will also affect the polishing effect of the polished material. The higher the hardness of the workpiece to be polished, the greater the consumption of the polishing material, but the roughness of the polishing material will decrease. Achieving lower roughness, the polishing time of the polishing material will also increase accordingly, and the probability of over-polishing will be greatly reduced.