Raw material problem
The Resin Abrasive Wheels are complex product made from a variety of main and auxiliary raw materials including filler, reinforcing material, coloring agent etc.
1. about abrasives At present, the quality of abrasives on the market is uneven, mainly as follows:
(1). The chemical specification of abrasives is often qualified, but also with poor physical properties. It is mainly shown that there is still a gap between bulk density of China and international quality material. (2). The particle distribution of some abrasives is disordered, which is quite different from the standard specification.
2. In terms of binder, mainly about phenolic resin:
(1). Resin quality stability problems, especially the level of free phenol in the resin. Excessive free phenol content will accelerate the cracking of the Resin Cutting Disc after heating and hardening of the resin wheel and affect the strength of the grinding wheel;
(2). The binder’s particle is too thick or too fine: It is generally believed that the fine grain is benefitial to uniform distribution of the binder. If the grain is too coarse, the molding material is not easily mixed uniformly, which affects the hardness and strength of the grinding wheel. Even for the coarse-grained resin sheet cutting wheel and the cymbal grinding wheel, the size of the binder (resin powder) selected should be finer than 320#.
Manufacturing process of resin grinding wheel
The manufacturing of Resin Grinding Disc is a highly technical industrial process. There are many problems in the processes of materials mixing, molding, hardening, and processing.
(1). Mixing process: The key of mixing is uniformity.
II. How to maintain the quality stability of resin grinding wheel
This paper mainly analyzes how the raw materials with phenolic resin and glass fiber mesh affect the quality stability of the resin grinding wheel.
The quality stability of the Steel Wheel is most prominent in the following two aspects:
(1). The change of strength and cutting performance of resin grinding wheel within a certain period (under normal temperature and humidity conditions);
(3). Stability of the technical indicators of the mesh The mesh was originally applied to the resin wheel to increase the strength of the wheel. As the performance of the resin grinding wheel continues to increase, the mesh plays a very important role in the resin grinding wheel, which is mainly manifested in fluctuations in the strength of the grinding wheel, deformation of cutting Flap Disc (mainly double-wire grinding wheel), stratification of abrasive disc etc.
III. The deformation of resin cutting wheel occurs frequently
The deformation of the resin grinding wheel has long troubled the manufacturers. The root of the deformation is the uneven organization in the effective area of the grinding wheel, which in turn causes uneven stress in the hardening process of the product.