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

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.