TC4钛合金材料的切削变形模拟及试验研究  

Simulation and Experimental Study of Cutting Deformation of TC4 Titanium Alloy

作　　者：康凤[1,2] 陈嫚丽[1,2] 宁海青[1,2] 胡传凯[1,2] 舒大禹[1,2] 沈蕾芳[2] 

机构地区：[1]国防科技工业精密塑性成形技术研究应用中心,重庆400039 [2]中国兵器工业第五九研究所,重庆400039

出　　处：《稀有金属与硬质合金》2012年第6期31-34,共4页Rare Metals and Cemented Carbides

基　　金：总装预研基金资助项目(9140A12011610)

摘　　要：针对钛合金材料难以加工切削的特点,以常用钛合金TC4为对象进行了切削变形模拟及试验研究。运用有限元法,再现了钛合金切削变形过程和切屑的形成机理。模拟仿真表明,在刀尖附近的材料由于高温、高应力状态形成了软化区,切屑根部发生热塑性失稳,使切屑上部被挤裂而下部仍旧相连,呈锯齿状。快速落刀试验表明,材料于刀尖附近的变形程度和温度较高,切屑发生集中剪切滑移,呈明显锯齿状,而原纵横交错分布的网篮状组织变成了沿切削方向的条纹状,并在切屑根部扫描组织中还观察到细小的微裂纹,切屑形态与仿真结果基本相同。In view of poor cutting performance of titanium alloy materials, simulation and experimental study on cutting deformation of the common titanium alloy TC4 were carried out. Cutting deformation process of the titanium alloy and its chip formation mechanism were reproduced by finite element analysis. The simulation results indicate that the material nearby the knifepoint softens because of high temperature and high stress,and thermoplastic instability happens at chip root resulting in the upper part of the chip squeezed to form cracks but the lower part still joined. Therefore, the chip appears serrated. The results from fast cutting tests show that with high distortion degree and temperature of the material nearby the knifepoint, centralized shear slip of the chip occurs resulting in obvious indentation of the chip. Meanwhile, original crisscross and basket-like microstructure changes into the stripe-like along the cutting direction. Tiny microcracks are also observed at chip root by SEM, and chip morphology and simulation results are almost uniform.

关 键 词：钛合金 切削变形 有限元分析 微观组织 切屑 热塑性失稳 

分 类 号：TG146.23[一般工业技术—材料科学与工程]