CBN磨料特性对树脂砂轮磨削性能的影响

Influence of different CBN grains on grinding performance of resin bonded CBN grinding wheel

对6种不同CBN磨料的静压破碎负荷、冲击韧性(TI)和热冲击韧性(TTI)的数据进行分析研究,并分别制作成树脂结合剂砂轮。针对不同材料工件进行磨削,研究不同CBN磨料制作的砂轮磨削铸铁、高速钢、不锈钢和氮化不锈钢等材料的磨削比。实验结果表明:同样结合剂和工艺条件下,不同CBN磨料制作砂轮的磨削比相差较大;树脂CBN砂轮对铸铁和高速钢材料的磨削比相对较高,但对不锈钢和氮化不锈钢材料的磨削比低;CBN–B1500和CBN850磨料对几种工件材料的磨削性能相对较好。树脂CBN砂轮中磨料靠结合剂机械嵌合力把持,因此具有粗糙表面和适中静压破碎负荷的CBN磨料是较优选择。

The compressive fracture strength,toughness index（TI）and thermal toughness index（TTI）data of 6kinds of different CBN abrasive grains are studied,and these grains are made into resin bonded CBN grinding wheel,respectively.The grinding ratios of different CBN abrasives on different materials,such as cast iron,high speed steel,stainless steel and nitride stainless steel are researched.Results show that at the same condition of wheel binders and production process,grinding ratios of different CBN abrasive grains show the dramatic differences.Grinding ratios of resin bonded CBN wheels for grinding the cast iron and high speed steel are relatively higher,while its grinding ratios for grinding the stainless steel and nitride stainless steel are lower.It is also found that grinding performances of CBN–B1500and CBN850 abrasive are relatively better for four materials.In conclusion,because of CBN grains in the grinding wheel are fixed by the mechanical insertion force of the resin binder,and so CBN grains with rough surface and moderate compressive fracture strength are better choice.