整硬麻花钻容屑槽与法向前角对钛合金钻削性能的影响

Influence of Chip Flute and Normal Rake Angle on Drilling Performance of Titanium Alloy

采用UG NX11.0软件建立了三种不同卷屑角的容屑槽,以锥面刃磨的方式构建钻尖三维模型。测量主切削刃的法向前角并绘制法向前角的分布曲线,分析三种曲线之间的关系。利用AdvantEdge有限元仿真软件模拟钻削过程中的切削力、切削形貌、切削温度和应力分布,并通过切削试验验证了有限元模拟的可靠性。结果表明:容屑槽卷曲角直接影响主切削刃法向刀具前角的分布,且主切削刃的法向刀具前角越大,切削越锋利,切削力越小;在一定范围内,随着容屑槽卷曲角α增大,轴向切削力减小,且切屑卷曲直径也越小,有利于排屑和提高刀具寿命。

Three types of chip pockets with different chip angles are established by UG NX11.0 software, and then a three-dimensional model of the drill tip is constructed by means of taper sharpening.By measuring the normal rake angle on the main cutting edge and drawing the distribution curve of the normal rake angle, the relationship between the three curves is analyzed.The finite element simulation software—AdvantEdge is used to simulate the cutting force, cutting profile, cutting temperature and stress during the drilling process, and then the reliability of the finite element simulation is verified by cutting experiments.The results show that the crimp angle of the chip flute directly affects the distribution of the main cutting edge′s rake angle, and the larger the main cutting edge′s normal rake angle is, the better performance and the smaller cutting force are.Within a certain range, with the curl angle α of the chip flute increasing, the axial cutting force decreases, and the chip curl diameter is smaller, which is conducive to chip discharge and improve tool life.