感应钎焊温度对立方氮化硼砂轮磨削性能的影响

摘要

利用超高频感应钎焊在不同钎焊温度条件下制备立方氮化硼(CBN)砂轮,采用扫描电子电镜(SEM)和能量分散谱仪(EDS)对磨粒表面新生化合物进行观察与分析,并通过与电镀 CBN 砂轮进行比较,对感应钎焊CBN砂轮的磨削性能进行评价.结果表明:CBN磨粒界面新生化合物主要组成元素有N、B、Ti三种,活性元素Ti发生扩散并与N和B发生化合反应;当感应钎焊温度为940℃时,磨粒表面生成物致密覆盖在表面,且所制备的 CBN 钎焊砂轮的磨削力和磨削比能较小.在相同磨削用量下,对电镀CBN砂轮和感应钎焊CBN砂轮的磨损形式进行对比分析发现,电镀 CBN 砂轮的磨损形式为黏附磨损,钎焊CBN砂轮的磨损形式为破碎磨损.%CBN grinding wheels were made under the conditions of different brazing temperatures by ultra-high frequency induction brazing.The new compound morphologies were observed and ana-lyzed by scanning electron microscope(SEM)and energy disperse spectroscope(EDS).The grinding performances of the brazed CBN wheels were evaluated by comparing with the electroplated CBN wheels.The results show that,N,B and Ti three elements were contained and formed at CBN inter-faces,active element Ti was diffused and the chemical reactions occured with elements N and B.The grinding forces and the grinding specific energy of the CBN brazed wheel were smaller and abrasive surfaces were covered by compounds when the induction brazing temperature was as 940℃.The wear forms of electroplated CBN wheels and induction brazing CBN wheels were compared under the same grinding parameters,the phenomena indicate the wear forms of electroplated CBN wheels caused by the adhension and the wear forms of induction brazing CBN wheel caused by the fracture.