What kind of bond is responsible for the improved strength of heavy-duty grinding wheels?

      Heavy-duty grinding wheel It is a high-strength, high-density, high-hardness, high-speed grinding wheel. It is installed on a special grinding machine and is used to grind surface defects of stainless steel, bearing steel and other special steel billets, ingots, plates and pipes. It has a high grinding ratio and high efficiency. Users can choose grinding wheels with different particle sizes, hardness, speeds, organization numbers and mixed abrasive ratios according to the type of steel grinding and the working load of the grinding machine. Which binder can be improved to enhance its strength? Let's talk about this issue:

      In order to enhance the strength of the mold and improve the processing performance of the molding material, when manufacturing grinding tools, please use 25-75 % epoxy resin solution (diluted with furfural) to wet the mixture. This improves its adsorption strength with the aluminosilicate filler in the mixture. However, due to the high concentration of wetting agent, a certain thickness is formed, covering the abrasive particles, thus preventing them from penetrating into the pores or cracks of the abrasive particles. Therefore, the adsorption strength between the binder and the abrasive grains cannot be improved. The increase in the strength of the heavy-duty grinding wheel cannot be guaranteed. In order to improve the strength of the heavy-duty grinding wheel, a method closer to the proposed method in terms of process is to mix the abrasive particles, wetting agent and binder when manufacturing the abrasive, and then immediately molding and hot pressing.

       Known operating methods attempt to first permeate the abrasive grains in furfural, and then mix with resin powder and filler. The wetting agent acts as a “ bridge ” ”. However, due to the high surface tension of furfural, when mixed with abrasive particles, it cannot penetrate into the pores and cracks of the abrasive particles, so the surface of the abrasive particles cannot be fully penetrated, which cannot ensure the production of abrasive particles and abrasives. The adhesive relies on adsorption bonding (which determines the contact strength of the entire molding material. In other words, the physicochemical interaction between the two at the abrasive-adhesive interface is not fully carried out, which affects the strength of the particles).

       To achieve the above purpose, the manufacturing method of organic binder grinding tools is still used by mixing the abrasive with the wetting agent and binder, molding and hot pressing. Adding 1-4 % epoxy resin solution.

       The presence of active substances in the pores, cracks and surfaces of the epoxy resin abrasive particles ensures that during the hot pressing process of the abrasive tool body, the chemical reaction of the epoxy resin with the wetting agent and phenolic resin binder improves the bonding ability of the abrasive and the binder, thereby increasing the strength of the mold.

   In addition, the improvement of the abrasive strength depends on the enhancement of the epoxy resin and binder that penetrates into the pores of the abrasive particles during hot pressing.