砂轮修整工具用金刚石的性能研究

Research on the performance of diamond used in dressing tools

对用作修整工具的金刚石而言,天然大单晶价格高昂,修整接触面不稳定,使用过程中需要翻修。近年来,修整工具的制造商们在不断开发它们的替代产品。本文对S i-Ti-B系粘结相,WC-Co粘结相聚晶金刚石,及CVD金刚石对其微观结构进行SEM分析;并分别对样品加热500℃、800℃,测其磨耗比,进行耐磨性和耐热性分析;并制作成修整工具修整P400×50×100WA46NV535M/s砂轮,做使用性能对比实验。研究结果表明:(1)CVD金刚石的耐磨性能和耐热性最好;(2)中等粒度PCD的耐磨性、耐热性和抗冲击性等综合性能更好,更适合制作砂轮修整工具;(3)可选用不同截面尺寸和数量的条状金刚石,来增加修整工具的适应性。

Natural single crystal diamond has such inferiorities when used for making dressing tools as that the price is high; the contact area in the dressing process is unstable; and it needs dress during the use. Recently, producers have been exploiting adequate replacements. In this paper, the micro-structure of Si - Ti - B bonded and WC - Co bond polycrystalline diamond as well as CVD diamond was analyzed by SEM; their wear resistance and thermal stability when heated to 500℃ , 800℃ was studied,and then the G - ratio was tested, and the application pertormances of the dressing tools made with the above PCD and CVD diamond were compared by dressing the same wheels under the same conditions, h is found that： 1 ）The wear resistance and thermal stability of CVD diamond are the best. 2） The polycrystalline diamond of medium granularity has better wear resistance, thermal stability and impact resistance, hence it shows advantageous properties. 3 ） bar shaped PCD is more suitable for making dressing tools.