单颗磨粒高速磨削Ti6Al4V仿真与试验验证

2019-04-23

作者：马志飞1，2，梁国星1，2，张昊1，2，田京京1，2 单位：1太原理工大学；2精密加工山西省重点实验室

摘要：基于ABAQUS有限元仿真方法，采用JohnsonCook材料本构模型模拟了不同磨粒负前角下Ti6Al4V高速磨削时的磨屑形态、磨屑剪切角和磨削力的变化趋势。结果表明：随着磨粒负前角的增加，磨屑剪切滑移程度增大、磨屑厚度增加且趋于扁平状；磨屑初始剪切角不断增加，随后磨屑剪切角在一定范围内波动，随着磨粒负前角的增大，剪切角不断减小；磨削力随着负前角的增大周期性波动变得更加显著，且随着磨粒负前角的增加而不断增加；仿真得到的磨屑形态和磨削力与试验具有较好的一致性。

关键词：负前角磨粒；Ti6Al4V；磨屑形态；磨削力；有限元仿真

中图分类号：TG58；TH161文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.04.012

Simulation and Experimental Investigation of Highspeed Grinding

Ti6Al4V with Single Grain

Ma Zhifei，Liang Guoxing，Zhang Hao，Tian Jingjing

Abstract:Based on the ABAQUS finite element simulation method，the JohnsonCook material constitutive model is used to simulate the tendency of chip morphology，shear angle and grinding force during highspeed grinding of Ti6Al4V under different negative angles of single abrasive grain.The results show that，as the negative rake angle of the single abrasive grain increases，the degree of shear slip and the thickness of the chip increases，and the chip morphology usually tends to be flat.The initial shear angle of grinding increases continuously，after the grinding is stabilized，the shear angle of the chip fluctuates within a certain range，as the negative rake angle of the abrasive grain is increased，the shear angle is decreased.The grinding force fluctuation becomes more prominent with the increase of the negative rake angle，and the grinding force increases with the increase of the negative rake angle of the abrasive grain.The simulated results of the chip shape are well consistent with the experimental results.

Keywords:abrasive grain with negative rake angle；Ti6Al4V；chip morphology；grinding force；finite element simulation