不同酚醛树脂对超硬砂轮性能的影响

Influence of different phenolic resins on the performance of superhard grinding wheel

随着超硬砂轮的用途越来越多,对超硬砂轮的成型机理及效果有必要做相应的研究。超硬砂轮主要使用酚醛树脂作为黏合剂,不同的酚醛树脂具有不同的理化性能和力学性能,会影响砂轮的磨削功率、磨耗比、粗糙度等。在相同的配方、磨料、成型工艺、磨削参数条件下,不同的树脂粉有不同的磨削性能,同一个砂轮在不同的磨削参数下也会有不同的磨削性能。在实际使用中,应根据应用场景、加工参数和精度要求选用合适的树脂。文章主要研究了不同酚醛树脂对超硬砂轮在平磨时的自锐性、保持性及砂轮损耗的影响。聚合时间长,流动度大,抗折强度高,则树脂的韧性好,耐磨性和型面保持力会比较好;流动度高,抗折强度低,则树脂的润湿性好,对磨料的包裹性好,更适合于精磨,既满足光洁度要求又有一定的磨削力;聚合时间短,硬度高,则树脂的强度大,更适用于大进给磨削。

With the increasing use of superhard grinding wheel, it is necessary to study the forming mechanism and effect of superhard grinding wheel accordingly. Superhard grinding wheel mainly uses phenolic resin as a binder, and different kinds of PF have different physical and chemical properties, and mechanical properties, which influence the grinding power, grinding loss ratio, roughness of grinding wheel. With the same formula, grinding material, forming process, grinding parameters, grinding wheels made by different resin powder perform differently. The same grinding wheel also has different performance under different grinding parameters. In practical use, appropriate resins should be selected according to the application scenario, processing parameters and accuracy requirements. In this paper, the effects of different phenolic resins on the self-sharpening, retention and wheel loss of superhard grinding wheels during flat grinding are mainly studied. If the polymerization time is long, the fluidity is large, and the flexural strength is high, the toughness of the resin is good, and the wear resistance and profile retention will be better. With high fluidity and low flexural strength, the wetting of the resin is good, the wrapping of the abrasive is good, and it is more suitable for fine grinding, which not only meets the requirements of the finish but also has a certain grinding force. With short polymerization time and high hardness, the resin strength is the largest, which is more suitable for large-feed grinding.