基于AdvantEdge的钻尖结构对TC4钻削性能影响研究

Research on the Influence of Drill Point Structure Based on AdvantEdge on TC4 Drilling Performance

钛合金作为一种典型的难加工材料,其弹性模量小、导热性差、比强度高,钻削时刀具极易磨损。针对该材料本文选取了四种不同钻尖结构的整体硬质合金麻花钻,基于AdvantEdge建立了有限元模型,分析了不同钻尖结构对切削力、切削温度及应力分布的影响,通过TC4钛合金钻削实验对比分析切削力、刀具磨损和钻头寿命,并验证仿真模型的可靠性;运用ZEISS扫描电子显微镜(SEM),深入分析四种钻头磨损形式和切屑锯齿化程度。结果表明:横刃较长的D型钻头磨损最小,寿命最长,但切削力最大,其他三种钻头横刃较短,强度偏弱,失效形式均为横刃处崩刃;C型钻头的断屑和排屑性能更好,可以减少堵屑情况发生,提高刀具寿命。

Titanium alloy,as a typical difficult-to-machine material,has small elastic modulus,poor thermal conductivity and high specific strength,and cutting tools are easily worn while drilling.In this paper,four kinds of solid carbide twist drills with different drill tip structures are selected.Firstly,the finite element model is established based on AdvantEdge,and the influence of different drill tip structures on cutting force,cutting temperature and stress distribution is analyzed.Then,through TC4 titanium alloy drilling experiment,the cutting force,tool wear and bit life are compared and analyzed,and the reliability of the simulation model is verified.By using ZEISS scanning electron microscope(SEM),four kinds of bit wear forms and chip sawtooth degree are deeply analyzed.The results show that the D-type bit with longer chisel edge has the least wear and the longest service life,but the cutting force is the largest.The other three bits have shorter chisel edge and weak strength,and the failure mode is the collapse at the chisel edge.C-type drill bit has better chip breaking and removing performance,which can reduce the occurrence of chip blocking and improve the tool life.