多孔金属结合剂CBN砂轮孔隙结构对磨料层胎体力学性能的影响

Effect of pore structure and distribution of porous metal bonded CBN wheel on mechanical properties of abrasive layer matrix

为解决多孔金属结合剂CBN砂轮在高孔隙率下的强度下降问题,采用球形尿素颗粒为造孔剂,制作孔径、孔形和孔隙可控的多孔金属结合剂砂轮磨料层胎体,研究不同载荷情况下的孔隙率和孔隙排布等孔隙结构因素,对多孔金属结合剂磨料层胎体力学性能的影响规律。结果表明:孔隙有序排布时的胎体弹性模量要小于孔隙无序排布的;胎体材料的屈服强度随孔隙率增大而下降;在相同孔隙率下,孔隙有序排布的胎体,在纵向受压、孔隙正向排布的情况下屈服强度更高。

In order to solve the problem of strength decline of porous metal bonded CBN wheel under high porosity,spherical urea particles were used to make porous metal bonded wheel abrasive layer matrix with controllable pore diameter,pore shape and pore size.The influence of pore structure factors such as porosity and pore arrangement on the mechanical properties of porous metal bonded abrasive layer matrix was studied under different loading conditions.The results show that the elastic modulus of the matrix with ordered pore arrangement is smaller than that with disordered pore arrangement,and that the yield strength of the matrix decreases with the increase of porosity.Under the same porosity,the matrix with ordered arrangement of pores has higher yield strength under the condition of longitudinal compression and positive arrangement of pores.