关键词: 材料去除率, 激光表面强化, 软固结磨粒群, 拓扑结构, 气压砂轮

Abstract:

：For a new finishing machining method-SCA(softness consolidation abrasives), the influence of internal abrasives’ topological structure of pneumatic grinding wheels with softness consolidation abrasives on materials removal rate is studied. The model of the materials removal mechanism of pneumatic grinding wheels is established. Meso-fabric parameters and the force chains net evolution of the abrasive group are analyzed under the monotonic loading. Relations between macro-mechanical properties and the meso-fabric evolution of the abrasive group is researched. The stress distributions on the area for abrasive layers with different topological structure contacting with workpieces are researched. The influence laws of abrasive’s mesh and volume matching on the material removal and surface roughness of workpieces can be concluded after a series of polishing experiments for the laser strengthening free-form surface by pneumatic wheels with softness consolidation abrasives. The experimental results show that the finishing machining by pneumatic grinding wheels with softness consolidation abrasives is available for the laser strengthening surface, which can achieve good processing effectiveness.

Key words: laser surface strengthening, materials removal rate, softness consolidation abrasives, topology, pneumatic wheel