Resin diamond grinding wheel is prone to errors in the process of processing, because the manufacturing of resin diamond grinding wheel belongs to the multidisciplinary synthesis of composite materials, so the causes are complex and numerous. Resin diamond grinding wheel is a complex system composed of a variety of main and auxiliary materials. As long as the material is abrasive grain and binding agent, the auxiliary materials include fillers, reinforcing materials, colorants, etc.

1. Abrasive particles should be concerned about the problem

At present, the quality of grinding grains on the market is uneven, mainly as follows:

(1) The chemical composition of the abrasive grains is often qualified, but the physical properties are poor; the main performance is that there is still a gap between the bulk density of the abrasive grains and foreign countries.

(2) The particle size composition of the abrasive grains is chaotic, which is quite different from the standard; it is mainly manifested in the basic grain content of the same particle size abrasive grains and foreign countries.

2. binder, mainly phenolic resin:

(1) The quality stability of the resin, especially the content of free phenol in the resin. Excessive free phenol content will accelerate the resin cracking of the resin diamond grinding wheel after heating and curing, which will affect the strength of the grinding wheel;

(2) resin powder and urotropine mixed uniformity, urotropine as the curing agent of the resin, urotropine added amount is insufficient, the resin curing is not complete, affecting the strength and hardness of the grinding wheel; content is too high, the excess of urotropine does not combine with the resin, in the curing process of decomposition and volatilization, so that the grinding wheel pores increase, reduce its strength and hardness.

(3) the binder particle size is too coarse or too fine:

It is generally believed that the particle size of the binder is preferably fine, which is advantageous for uniform distribution of the binder. If the particle size is too coarse, the molding material is not easy to mix evenly, which affects the hardness and strength of the grinding wheel. Even for the coarser particle size of the resin sheet cutting wheel and cymbal grinding wheel, the choice of binder (resin powder) particle size should also be fine.

However, if the particle size of phenolic resin powder is too fine, it will bring difficulties to the mixing, and it is difficult to achieve the uniformity of the mixture, which will affect the cutting and grinding performance of the resin diamond grinding wheel.