表面微织构和内冷却对钻削Ti6Al4V切削力及切屑形态的影响

2018-10-19

作者：郭大林1，郭旭红1，张克栋1，盖立武2，陈亚东1，周驰驰1 单位：1苏州大学；2苏州市职业大学

摘要：Ti6Al4V钛合金是一种典型的难加工材料，本文采用光纤激光打标机在内冷麻花钻的前刀面、后刀面以及前后刀面上加工沟槽型微织构，制备出TF、TB和TFB型3种刀具进行Ti6Al4V的钻削试验，并对不同切削速度下的钻削力和切屑形态进行了分析研究。结果表明：在表面微织构和内冷却双重作用下，3种刀具的钻削力均有不同程度下降，切屑的卷曲程度增加，刀具的断屑能力提高；TF钻头能明显增加切屑卷曲程度和提高刀具的断屑能力，TB钻头可以更好地降低钻削力，TFB钻头的综合效果更好。

关键词：内冷麻花钻；微织构；钻削力；切屑形态

中图分类号：TG501；TG713.1；TH117文献标志码：A

Effect of Combined Internal Cooling and Microgroove Texture on

Cutting Force and Chip Morphology in Drilling Ti6Al4V

Guo Dalin，Guo Xuhong，Zhang Kedong，Gai Liwu，Chen Yadong，Zhou Chichi

Abstract:To reduce the cutting temperature and improve the antifriction of the toolchip and toolworkpiece interfaces，microgroove textures are fabricated in the rake，flank and the both faces of the carbide internal cooling twist drills by Nd：YAG laser.Drilling experiments are carried out on Ti6Al4V at different cutting speeds.The results show that the microgroove textures on the rake face can significantly increase the degree of chip curling，reduce the contact length at the toolchip interface，and improve the chip breaking capacity while the internal cooling ability can be significantly enhanced by the microtextures in the flank face to decrease the drilling force.

Keywords:internal cooling twist drill；microgroove texture；drilling force；chip morphology