Abstract: The roller surface structure is a critical factor influencing the crushing efficiency of high-pressure grinding
rolls (HPGR). To investigate the influence of structural parameters on the comminution performance,this study established a
numerical model of the HPGR using the Discrete Element Method (DEM) based on the Rocky-DEM platform. Through orthogonal
experiments and single-factor tests,the effects of stud diameter,spacing ratio,interval angle,and stud height on the average
roller force,mean comminution ratio,and system energy dissipation were systematically analyzed. The results indicate that
the interval angle has the most significant impact on both roller force and the degree of material breakage,while the spacing ratio
is the key parameter governing system energy dissipation. Single-factor analysis further revealed that the mean comminution
ratio is negatively correlated with stud diameter,spacing ratio,and interval angle,but positively correlated with stud height. The
optimal parameter combination was determined as follows:a stud diameter of 10 mm,a spacing ratio of 1. 6,an interval angle of
3°,and a stud height of 7 mm,achieving a mean comminution ratio of 5. 30. This research provides a theoretical basis for the
optimal design and efficient operation of HPGR roller surfaces.