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根据刀具和工件的相对运动,建立了一种新型机-热耦合车削毛刺形成有限元模型,利用撑板法解决了残留在工件侧面多余塑性变形对运算结果的影响,并大大提高了运算效率。根据车削毛刺形成过程模拟结果的分析,发现了在毛刺形成阶段工件被切削层材料既有弯曲塑性变形又有部分材料被切除的现象。结合AISI1045钢车削试验,对所建立的模型进行了验证,结果表明:车削毛刺尺寸模拟结果和试验结果取得了较好的吻合。该模型的建立为深入研究毛刺形成过程中切削热、切削力、工件材料形变、塑性流动等提供了一条有效的途径。
According to the relative movement of tool and workpiece, a new finite element model of burr formation by machine - thermal coupling was established. The influence of excess plastic deformation remaining on the side of workpiece was solved by using the strut method, and the computing efficiency was greatly improved. According to the analysis of simulation results of turning burr formation process, it is found that the material of cutting layer is bent and plastically deformed and some of the material is cut off during the burr forming phase. Combined with the AISI1045 steel turning test, the established model is verified. The results show that the simulation results of the turning burr size are in good agreement with the experimental results. The establishment of the model provides an effective way to further study the cutting heat, cutting force, workpiece material deformation, plastic flow and so on.