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Exploration of abrasive and bonding agent issues in resin diamond grinding wheels
Release time:
2025-02-18
Resin diamond grinding wheels are prone to errors during the manufacturing process.
Resin diamond grinding wheels are prone to errors during processing and manufacturing because the manufacturing of resin diamond grinding wheels involves multiple disciplines and composite materials, resulting in complex and numerous causes. Resin diamond grinding wheels are complex systems composed of various main and auxiliary raw materials. The materials consist of abrasives and a bonding agent, while auxiliary materials include fillers, reinforcing materials, and colorants.
1. Issues to Consider Regarding Abrasives
Currently, the quality of abrasives on the market varies greatly, mainly manifested in:
(1) Abrasives often have acceptable chemical composition, but poor physical properties; mainly manifested in the difference in abrasive packing density compared to international standards.
(2) The particle size distribution of abrasives is chaotic and significantly deviates from the standard; mainly manifested in the difference in the basic particle content of the same particle size abrasives compared to international standards.
2. Regarding the bonding agent, mainly phenolic resin:
(1) The problem of resin quality stability, especially the content of free phenol in the resin. Excessive free phenol content will accelerate the cracking of the resin after heating and curing of the resin diamond grinding wheel, affecting the strength of the wheel;
(2) The mixing uniformity of resin powder and hexamethylenetetramine. Hexamethylenetetramine, as a curing agent for resin, insufficient addition of hexamethylenetetramine will result in incomplete resin curing, affecting the strength and hardness of the grinding wheel; excessive content will result in excess hexamethylenetetramine not bonding with the resin, decomposing and volatilizing during curing, increasing the pores in the grinding wheel, and reducing its strength and hardness.
(3) Bonding agent particle size is too coarse or too fine:
It is generally believed that the finer the particle size of the bonding agent, the better, which helps to ensure uniform distribution. If the particle size is too coarse, the forming material is not easily mixed uniformly, affecting the hardness and strength of the grinding wheel. Even for resin blade cutting wheels and abrasive wheels with coarser particle sizes, the bonding agent (resin powder) used should have a finer particle size.
However, if the particle size of the phenolic resin powder is too fine, it creates difficulties in mixing, making it difficult to achieve uniformity in the mixture, which in turn affects the cutting and grinding performance of the resin diamond grinding wheel.
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