成型助剂添加方式对陶瓷CBN内圆磨砂轮性能的影响

Effect of addition mode of forming additive on properties of ceramic CBN internal grinding wheel

以自制的低温高分子成型助剂为基础,研究未添加、颗粒添加、熔融添加3种不同方式对陶瓷CBN试条抗折强度、砂轮成型料均匀性、砂轮组织均匀性及其显微结构和磨削性能的影响.结果表明:熔融添加高分子成型助剂时,冷却后其能够在CBN砂轮成型料表面形成均匀包裹,成型料的松散性和均匀性均有明显改善;当以颗粒和熔融方式添加成型助剂时,制备的陶瓷CBN试条抗折强度极差值比未添加助剂试条的分别降低了34.02%和73.77%,陶瓷CBN内圆磨砂轮密度极差率较未添加的砂轮降低了56.83%和79.14%,且砂轮组织结构更均匀;当熔融添加成型助剂时,制备的陶瓷CBN内圆磨砂轮磨削叶片泵定子时未出现喇叭口,寿命是未添加高分子成型助剂砂轮的2倍.

Based on self-made low-temperature polymer forming aid, the effect of adding modes, namely unadded, particle addition and melt addition, on the bending strength of ceramic CBN test strips, the uniformity of ceramic CBN grinding wheel forming materials, the uniformity of wheel structure and the micro-structure and grinding properties of ceramic CBN internal grinding wheel were studied. The results show that when the polymer forming aid is added by melting, it can form a uniform coating on the surface of the CBN grinding wheel molding material after cooling, and that the looseness and uniformity of the molding material are obviously improved. When the additives are added in the form of granules and melting, the extreme difference of flexural strength of CBN strips are 34.02% and 73.77% lower than that of unadded strips respectively. The density differences of ceramic CBN internal grinding wheel are reduced by 56.83% and 79.14% compared with that of unadded grinding wheel, and the structures of grinding wheels are more uniform. When the polymer forming aid is added by melting, the ceramic CBN internal grinding wheel does not show the bell mouth when grinding the vane pump stator, and its service life is twice as long as that of the wheel without polymer forming additive.