金刚石砂轮树脂结合剂的性能分析

金刚石树脂砂轮的磨削性能在很大程度上取决于结合剂的性能。目前，金刚石树脂砂轮普遍采用溶液聚合热塑性酚醛树脂作结合剂，此结合剂存在着易吸潮结团、混料困难、不易长期存放，需加固化剂才能固化，且固化过程中有大量的有害气体溢出，使用时需要加工成粉末等缺点。为克服以上不足，采用悬浮聚合热固性酚醛树脂作金刚石树脂砂轮的结合剂，可较好的解决以上问题。本文通过采用粒度分析、红外光谱分析、差热分析、失重分析及色泽对比等分析手段对悬浮聚合热固性酚醛树脂的理化性能进行了分析比较，并对该树脂结合剂在金刚石砂轮上的应用进行了磨削对比试验。由于热固性酚醛树脂结合剂具有强度高、耐热性好、颗粒粉末细、分散流动性好及使用方便等特点，试验结果表明．用悬浮聚合热固性酚醛树脂结合剂研制的金刚石砂轮其综合性能及磨削效果均优于溶液聚合热塑性酚醛树脂结合剂金刚石砂轮。

ANALYSIS ON THE PERFORMANCES OF RESINOID BOND USED IN DIAMOND GRINDING WHEEL

The grinding performances of resin bond diamond grinding wheel depend greatly on the performance of the bond resin. Thermoplastic phenol-formaldehyde resin bond synthesized by solution polymerization is commonly used in making diamond grinding wheel, which has disadvantages such as: absorbing moisture, difficult mixing, can not being long term store, needing curing agent, and giving off dangerous gas. In order to overcome the shortcomings above, thermosetting phenol-formaldehyde resin bond synthesized by suspension polymerization is used in making diamond grinding wheel. pesformances of the above thermosetting phenol-formaldehyde resin bond are stadied by means of size analyser, infrared spectrum, differential thermal analysis, weightlerrness as well as cotor contrast. The results show that, the above resinoid bond has advantages as high strength, high heat-resistance, finer pacticles, dispering flow ability and convenient use. Grinding test on the diamond wheel made with the above resin bond indicate that, such grinding wheel showed compressive strength up to 84.5 N and grinding efficiency up to 0.92.