为研究单颗CBN磨粒高速/超高速磨削的微观机理,以随机形状CBN磨粒为模型,采用Lagrange/Euler流固耦合方法,仿真分析不同工艺参数下的CBN磨粒磨削SHK-9高速钢的过程.结果表明:CBN磨粒(124~150 μm)在切削深度ap 20 μm、30 μm,切削速度120 m/s时,切向磨削力达到最大,但在ap 40 μm切削深度下反而最小.随着CBN磨料粒度尺寸变小,磨削力下降明显,磨粒可以在工件表面形成更为窄密的耕犁沟痕,配合适当的磨削深度有助于提高表面磨削质量.%In order to investigate the micromechanism of high/ultrahigh speed grinding process with single CBN grain, the mechanism of CBN abrasive grinding high-speed steel SHK-9 under different process parameters was studied by using Lagrangian/Euler fluid-solid coupling method with random shaped CBN abrasive as the analysis model.Result shows that the tangential grinding force of CBN abrasive grains sized 124 to 150 μm is maximized at cutting depth of 20 μm or 30 μm, cutting speed of 120 m/s, but it is minimized at cutting depth of 40 μm.With reduced grain size of CBN abrasive, the grinding force decreases obviously, while abrasive grains can form narrower scratches on the surface of the workpiece.Therefore, the appropriate grinding depth combined with proper grain size can improve the grinding surface quality.
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