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<p>To explore the surface hole defect formation mechanism and suppress their formation in high-speed grinding of particulate-reinforced titanium matrix composites (PTMCs), this study established a PTMCs grinding mesoscopic simulation model containing TiC reinforced particles based on the abrasive grit and material characteristics, with which the hole defect formation process on PTMCs grinding surface was investigated, and the influence laws of material removal on the surface hole defects depth were analyzed. Further, a grinding technique restraining the hole defects occurrence on the grinding surface was proposed. As a result, errors between simulated and experimental values of single grit grinding force (SGF) ranged from 2% to 10%, all of which were below 10%. Brittle removal of reinforced particles encompassed brittle fracture, crack initiation, crack propagation and bulk fragmentation. With the decrease in rake angle of abrasive grits from − 41˚ to -65˚, the hole defects depth on the grinding surface decreased from 2&#xa0;μm to 0.96&#xa0;μm, showing a 52% reduction. The secondary material removal easily led to stress concentration within internal crack defects of TiC reinforced particles, and internal cracks propagated rapidly under tensile stress, ultimately forming deeper hole defects on the grinding surface than those from the primary material removal. Using large cutting depth small cutting thickness grinding (LDSCG), the PTMCs grinding surface was smooth and flat without evident hole defects. The specific material removal rate (SMRR) reached 2 mm<sup>3</sup>/(mm•s), which was twice higher than that under ordinary high-speed grinding.</p>

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Formation mechanism and suppression strategy of surface hole defects during high-speed grinding of particulate reinforced titanium matrix composites

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Zheng Li,
  • Yun He,
  • Xitong Han,
  • Chenlin Zhu,
  • Junjie Shen,
  • Shuai Tian,
  • Yang Cao

摘要

To explore the surface hole defect formation mechanism and suppress their formation in high-speed grinding of particulate-reinforced titanium matrix composites (PTMCs), this study established a PTMCs grinding mesoscopic simulation model containing TiC reinforced particles based on the abrasive grit and material characteristics, with which the hole defect formation process on PTMCs grinding surface was investigated, and the influence laws of material removal on the surface hole defects depth were analyzed. Further, a grinding technique restraining the hole defects occurrence on the grinding surface was proposed. As a result, errors between simulated and experimental values of single grit grinding force (SGF) ranged from 2% to 10%, all of which were below 10%. Brittle removal of reinforced particles encompassed brittle fracture, crack initiation, crack propagation and bulk fragmentation. With the decrease in rake angle of abrasive grits from − 41˚ to -65˚, the hole defects depth on the grinding surface decreased from 2 μm to 0.96 μm, showing a 52% reduction. The secondary material removal easily led to stress concentration within internal crack defects of TiC reinforced particles, and internal cracks propagated rapidly under tensile stress, ultimately forming deeper hole defects on the grinding surface than those from the primary material removal. Using large cutting depth small cutting thickness grinding (LDSCG), the PTMCs grinding surface was smooth and flat without evident hole defects. The specific material removal rate (SMRR) reached 2 mm3/(mm•s), which was twice higher than that under ordinary high-speed grinding.