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根据单颗CBN磨粒的实际几何特征和磨削特点,CBN磨粒被简化成切头方锥形,分别建立了单颗CBN磨粒微切削合金钢20CrMo的力学模型和相应的有限元仿真模型,从微观角度分析了单颗CBN磨粒的切削成屑机理和磨削力。研究结果表明:磨粒的推挤使工件材料发生塑性变形,沿磨粒的前方及两侧隆起,并最终于磨粒的前方流出而形成磨屑,但是当磨粒前角比较小时很难形成连续的磨屑;研究了磨粒速度、切削深度及前角变化对法向及切向磨削力的影响规律。
According to the actual geometric characteristics and grinding characteristics of single CBN abrasive grains, the CBN abrasive grains are simplified into a square conical cut, and the mechanical model and the corresponding finite element simulation model of the single CBN abrasive micro-machined alloy steel 20CrMo , From a micro perspective analysis of a single CBN abrasive chip cutting mechanism and grinding force. The results show that the pushing of the abrasive particles causes the workpiece material to be plastically deformed and bulges along the front and sides of the abrasive particles and finally flows out to the front of the abrasive particles to form abrasive debris. However, it is difficult to form when the abrasive grain front angle is relatively small The effect of abrasive velocity, cutting depth and rake angle on normal and tangential grinding forces was studied.